AMERUS LIFE HOLDINGS INC
424B1, 1998-06-15
LIFE INSURANCE
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<PAGE>   1
 
PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED JUNE 10, 1998)
 
                                  $125,000,000
                                                 AMERUS LIFE HOLDINGS, INC. LOGO
                           AMERUS LIFE HOLDINGS, INC.
 
                          6.95% SENIOR NOTES DUE 2005
                               ------------------
 
     The 6.95% Senior Notes due June 15, 2005 (the "Notes") of AmerUs Life
Holdings, Inc. (the "Company") being offered hereby will mature on June 15,
2005. Interest on the Notes is payable semiannually on June 15 and December 15
of each year, commencing December 15, 1998. The Notes are not redeemable prior
to maturity and are not entitled to any sinking fund. See "Description of
Notes."
 
     The Notes will be represented by one or more global Notes registered in the
name of the nominee of The Depository Trust Company ("DTC"), which will act as
the depository. Interests in the global Notes will be shown on, and transfers
thereof will be effected only through, records maintained by DTC and its
participants. Except as described herein, Notes in definitive form will not be
issued. Settlement for the Notes will be made in immediately available funds.
The Notes will trade in DTC's Same-Day Funds Settlement System, and secondary
market trading activity in the Notes will therefore settle in immediately
available funds. All payments of principal and interest will be made by the
Company in immediately available funds. See "Description of Notes -- Same-Day
Settlement and Payment."
 
                               ------------------
 
      SEE "RISK FACTORS" BEGINNING ON PAGE S-7 OF THIS PROSPECTUS SUPPLEMENT AND
PAGE 13 OF THE ACCOMPANYING PROSPECTUS FOR CERTAIN CONSIDERATIONS RELEVANT TO AN
INVESTMENT IN THE NOTES.
 
                               ------------------
 
 THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
  AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS SUPPLEMENT OR THE PROSPECTUS TO WHICH IT
      RELATES. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
===============================================================================================================
                                       PRICE TO                  UNDERWRITING                PROCEEDS TO
                                      PUBLIC(1)                  DISCOUNT(2)                COMPANY(1)(3)
<S>                                  <C>                           <C>                       <C>
- - ---------------------------------------------------------------------------------------------------------------
Per Note                               99.880%                      .625%                      99.255%
- - ---------------------------------------------------------------------------------------------------------------
Total                                $124,850,000                  $781,250                  $124,068,750
===============================================================================================================
</TABLE>
 
  (1) Plus accrued interest, if any, from June 16, 1998.
 
  (2) The Company has agreed to indemnify the Underwriters against certain
      liabilities, including liabilities under the Securities Act of 1933, as
      amended.
 
  (3) Before deduction of expenses payable by the Company estimated at $300,000.
 
                               ------------------
 
     The Notes are offered severally by the Underwriters, as specified herein,
subject to receipt and acceptance by them and subject to their right to reject
any order in whole or in part. It is expected that the Notes will be ready for
delivery in book-entry form only through the facilities of DTC in New York, New
York, on or about June 16, 1998, against payment therefor in immediately
available funds.
 
                               ------------------
 
SALOMON SMITH BARNEY                                        GOLDMAN, SACHS & CO.
CHASE SECURITIES INC.                                 CREDIT SUISSE FIRST BOSTON
 
June 11, 1998
<PAGE>   2
 
     IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE NOTES OFFERED
HEREBY AT A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN MARKET.
SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
                               ------------------
 
     THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE IOWA
COMMISSIONER OF INSURANCE NOR HAS THE IOWA COMMISSIONER OF INSURANCE RULED UPON
THE ACCURACY OR ADEQUACY OF THE ACCOMPANYING PROSPECTUS (THE "PROSPECTUS") OR
THIS PROSPECTUS SUPPLEMENT.
                               ------------------
 
     FOR NORTH CAROLINA INVESTORS: THE COMMISSIONER OF INSURANCE OF THE STATE OF
NORTH CAROLINA HAS NOT APPROVED OR DISAPPROVED THIS OFFERING NOR HAS SUCH
COMMISSIONER RULED UPON THE ACCURACY OR THE ADEQUACY OF THE ACCOMPANYING
PROSPECTUS OR THIS PROSPECTUS SUPPLEMENT.
                               ------------------
 
     THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995 PROVIDES A SAFE HARBOR
FOR FORWARD-LOOKING STATEMENTS. A NUMBER OF MATTERS AND SUBJECT AREAS DISCUSSED
OR INCORPORATED BY REFERENCE IN THIS PROSPECTUS SUPPLEMENT OR THE ACCOMPANYING
PROSPECTUS ARE NOT LIMITED TO HISTORICAL OR CURRENT FACTS AND DEAL WITH
POTENTIAL FUTURE CIRCUMSTANCES AND DEVELOPMENTS. FACTORS THAT MAY CAUSE ACTUAL
RESULTS TO DIFFER MATERIALLY FROM THOSE CONTEMPLATED OR PROJECTED IN SUCH
FORWARD LOOKING STATEMENTS INCLUDE, AMONG OTHERS, THE FOLLOWING POSSIBILITIES:
(I) HEIGHTENED COMPETITION, INCLUDING THE ENTRY OF NEW COMPETITORS AND THE
DEVELOPMENT OF NEW PRODUCTS BY COMPETITORS; (II) ADVERSE STATE AND FEDERAL
LEGISLATION AND REGULATION, INCLUDING INCREASES IN MINIMUM CAPITAL AND RESERVES,
AND OTHER FINANCIAL VIABILITY REQUIREMENTS AND ADDITIONAL REGULATIONS OF MUTUAL
HOLDING COMPANIES; (III) FAILURE TO DEVELOP MULTIPLE DISTRIBUTION CHANNELS IN
ORDER TO OBTAIN NEW CUSTOMERS OR FAILURE TO RETAIN EXISTING CUSTOMERS; (IV)
INABILITY TO CARRY OUT MARKETING AND SALES PLANS, INCLUDING, AMONG OTHERS,
CHANGES TO CERTAIN PRODUCTS AND ACCEPTANCE OF THE REVISED PRODUCTS IN THE
MARKET; (V) LOSS OF KEY EXECUTIVES; (VI) CHANGES IN INTEREST RATES CAUSING A
REDUCTION OF INVESTMENT INCOME; (VII) GENERAL ECONOMIC AND BUSINESS CONDITIONS
WHICH ARE LESS FAVORABLE THAN EXPECTED; (VIII) UNANTICIPATED CHANGES IN INDUSTRY
TRENDS; (IX) INACCURACIES IN ASSUMPTIONS REGARDING FUTURE MORBIDITY,
PERSISTENCY, MORTALITY AND INTEREST RATES USED IN CALCULATING RESERVE AMOUNTS;
(X) ADVERSE CHANGES IN RATINGS ASSIGNED BY RATING AGENCIES; (XI) CHANGES IN TAX
LAWS WHICH NEGATIVELY AFFECT DEMAND FOR THE COMPANY'S PRODUCTS; (XII) THE RISK
FACTORS OR UNCERTAINTIES LISTED HEREIN OR LISTED FROM TIME TO TIME IN THIS
PROSPECTUS SUPPLEMENT, THE ACCOMPANYING PROSPECTUS OR ANY DOCUMENT INCORPORATED
BY REFERENCE HEREIN; AND (XIII) WITH RESPECT TO COST SAVINGS THAT ARE EXPECTED
TO BE REALIZED FROM, AND COSTS ASSOCIATED WITH, THE RECENT ACQUISITIONS OF DELTA
LIFE CORPORATION ("DELTA") AND AMVESTORS FINANCIAL CORPORATION ("AMVESTORS"),
THE FOLLOWING POSSIBILITIES: (A) THE EXPECTED COST SAVINGS TO BE REALIZED
THROUGH COMBINING CERTAIN FUNCTIONS OF THE COMPANY, DELTA AND AMVESTORS TO
ELIMINATE REDUNDANCIES AND BETTER SERVE THE COMBINED COMPANY'S CUSTOMERS, AND
REDUCTIONS IN STAFF CANNOT BE FULLY REALIZED BECAUSE THE CHANGES ARE NOT MADE OR
UNANTICIPATED ADDED COSTS ARE INCURRED; AND (B) COSTS OR DIFFICULTIES RELATED TO
THE INTEGRATION OF
 
                                       S-2
<PAGE>   3
 
THE BUSINESSES OF DELTA AND AMVESTORS WITH THE COMPANY'S OTHER BUSINESSES ARE
GREATER THAN EXPECTED. A VARIETY OF FACTORS COULD CAUSE THE COMPANY'S ACTUAL
RESULTS TO DIFFER MATERIALLY FROM THE EXPECTED RESULTS EXPRESSED IN THE
COMPANY'S FORWARD-LOOKING STATEMENTS, INCLUDING THOSE SET FORTH IN THE RISK
FACTORS AND ELSEWHERE IN THIS PROSPECTUS SUPPLEMENT, THE ACCOMPANYING PROSPECTUS
OR THE DOCUMENTS INCORPORATED BY REFERENCE THEREIN.
 
                                       S-3
<PAGE>   4
 
                                  THE COMPANY
 
OVERVIEW
 
     The Company is an insurance holding company engaged through its
subsidiaries in the business of marketing, underwriting and distributing a broad
range of individual life insurance and annuity products to individuals and
businesses in 49 states, the District of Columbia and the U.S. Virgin Islands.
The Company's primary product offerings consist of whole life, universal life
and term life insurance policies and fixed annuities. As of March 31, 1998, the
Company had approximately 567,000 life insurance policies and annuity contracts
outstanding and individual life insurance in force, net of reinsurance, of
approximately $26.9 billion with life insurance reserves of $2.4 billion and
annuity reserves of $5.9 billion. As of March 31, 1998, the Company had total
assets of $10.4 billion and total shareholders' equity of $944.6 million. See
"The Company," "Organizational Structure" and "Business" in the accompanying
Prospectus for a more detailed description of the Company.
 
RECENT ACQUISITIONS
 
     The Company made two major acquisitions in 1997. The Company acquired Delta
Life Corporation ("Delta") on October 23 for approximately $165 million in cash
and AmVestors Financial Corporation ("AmVestors") on December 19 in a stock
exchange valued at approximately $350 million. Both Delta and AmVestors
specialize in the sale of fixed annuity products, thus strengthening the
Company's presence in the rapidly growing asset accumulation and retirement
savings markets. The acquisitions, along with the growth of AmerUs Life
Insurance Company ("AmerUs Life"), increased the Company's assets from $4.4
billion at March 31, 1997 to $10.4 billion at March 31, 1998.
 
                              RECENT DEVELOPMENTS
 
REFINANCING PLAN
 
     On April 16, 1998, the Company announced a refinancing plan (the
"Refinancing Plan") that includes this offering of Notes and an offering of up
to $150 million of unit securities (the "Units") consisting of subordinated debt
securities and a contract to purchase the Company's Class A Common Stock, no par
value (the "Class A Common Stock") (the "Units Offering," and together with this
offering of Notes, the "Offerings"). Proceeds from the Offerings will be used to
repay the outstanding balance of $250 million on the Company's revolving bank
debt (the "Bank Debt"), to partially fund a buyback of up to $75 million of the
Company's Class A Common Stock (the "Stock Repurchase Plan") and for general
corporate purposes.
 
     The Units Offering requires the approval of the Iowa Commissioner of
Insurance (the "Commissioner"). On April 16, 1998, the Company filed an
application to obtain such approval. The Commissioner held a hearing on May 27,
1998 to review the Company's application in respect of the Units Offering. If
the Commissioner approves the Units Offering, the Company expects to commence
the Units Offering as soon as practicable after obtaining such approval and any
bank consents which may be required for the Units Offering. See "Risk Factors --
Uncertainties Regarding the Future Sale of Equity Securities."
 
RECENT RATINGS ACTIONS
 
     Certain ratings agencies have recently reviewed the ratings assigned to the
Company and its life insurance subsidiaries. On April 14, 1998, Standard &
Poor's Ratings Service reaffirmed its single-A insurer financial strength rating
for AmerUs Life, while on May 1, 1998, Moody's Investors Service, Inc.
("Moody's") downgraded AmerUs Life's financial strength rating to A3 from A2. At
the same time, Moody's reaffirmed the long-term credit ratings of the Company at
Ba1 for the Company's junior subordinated debt and at Baa3 for the preferred
stock rating of AmerUs Capital I and upgraded the insurance financial strength
rating of AmVestor's subsidiary, American Investors Life Insurance Company, to
Baal from Baa3. In addition, Moody's assigned an A3 insurance financial strength
rating to Delta's life insurance subsidiary, Delta Life and Annuity Company.
Moody's warned that the outlook on all the debt, preferred stock and insurance
financial strength ratings remained negative, given the Company's aggressive
strategy of rapid growth through acquisitions. See "Risk Factors -- Importance
of Ratings" in the accompanying Prospectus.
 
                                       S-4
<PAGE>   5
 
                        SELECTED CONSOLIDATED FINANCIAL
                               AND OPERATING DATA
 
     The following table sets forth certain consolidated financial and operating
data of the Company. The selected consolidated financial and operating data
below for the three-month periods ended March 31, 1997 and 1998 are derived from
unaudited interim financial statements of the Company incorporated by reference
in the accompanying Prospectus. In the opinion of management, such unaudited
interim financial statements include all adjustments (consisting only of normal
recurring accruals) necessary for a fair, consistent presentation, in accordance
with generally accepted accounting principles ("GAAP"), of such information. The
selected consolidated financial and operating data for the three-months ended
March 31, 1998 are not necessarily indicative of the Company's results for any
future interim period or the entire year. During the fourth quarter of 1997, the
Company acquired Delta and AmVestors in transactions that were accounted for
using the purchase method of accounting. As a result, only the Consolidated
Income Statement Data and the Consolidated Balance Sheet Data as of or for the
three-month period ended March 31, 1998 include the results of Delta and
AmVestors.
 
<TABLE>
<CAPTION>
                                                                   AS OF OR FOR THE
                                                                  THREE MONTHS ENDED
                                                                MARCH 31, (UNAUDITED)
                                                                ----------------------
                                                                 1998(A)       1997
                                                                 -------       ----
                                                                (DOLLARS IN MILLIONS,
                                                                EXCEPT PER SHARE DATA)
<S>                                                             <C>          <C>
CONSOLIDATED INCOME STATEMENT DATA:
Revenues:
  Insurance premiums........................................    $    17.3    $     8.2
  Product charges...........................................         16.4         11.2
  Net investment income.....................................        133.1         50.9
  Realized gains on investments.............................          6.2          5.2
  Contribution from the Closed Block........................          9.0          9.3
                                                                ---------    ---------
Total revenues..............................................        182.0         84.8
                                                                ---------    ---------
Benefits and expenses:
  Total policyowner benefits................................        107.3         45.5
  Total expenses............................................         36.2         16.1
  Dividends to policyowners.................................          0.3          0.1
                                                                ---------    ---------
Total benefits and expenses.................................        143.8         61.7
                                                                ---------    ---------
Income from operations......................................         38.2         23.1
Interest expense............................................          6.7          3.0
                                                                ---------    ---------
Income before income tax expense and equity in earnings of
  unconsolidated subsidiary.................................         31.5         20.1
Income tax expense..........................................         10.1          5.7
                                                                ---------    ---------
Income before equity in earnings of unconsolidated
  subsidiary................................................         21.4         14.4
Equity in earnings of unconsolidated subsidiary.............          0.4          0.2
                                                                ---------    ---------
Net income..................................................    $    21.8    $    14.6
                                                                =========    =========
Earnings per common share(B)................................
  Basic.....................................................    $    0.63    $    0.63
  Diluted...................................................         0.62         0.63
Dividends declared per common share.........................         0.10           --
Ratios of earnings to fixed charges(C)(D)...................         1.39x        2.11x
</TABLE>
 
                                       S-5
<PAGE>   6
 
<TABLE>
<CAPTION>
                                                                   AS OF OR FOR THE
                                                                  THREE MONTHS ENDED
                                                                MARCH 31, (UNAUDITED)
                                                                ----------------------
                                                                 1998(A)       1997
                                                                 -------       ----
                                                                (DOLLARS IN MILLIONS,
                                                                EXCEPT PER SHARE DATA)
<S>                                                             <C>          <C>
CONSOLIDATED BALANCE SHEET DATA:
Total invested assets.......................................    $ 7,775.7    $ 2,864.1
Total assets................................................     10,354.9      4,412.0
Total liabilities...........................................      9,324.3      3,822.4
Company-obligated mandatorily redeemable preferred
  securities................................................         86.0         86.0
Total stockholders' equity(E)...............................        944.6        503.6
OTHER OPERATING DATA:
Adjusted operating income(F)................................    $    19.5    $    11.6
Adjusted operating income per common share (basic and
  diluted)(F)...............................................         0.56         0.50
Individual life insurance in force, net of reinsurance......       26,935       25,735
Life insurance reserves.....................................        2,369        2,065
Annuity reserves............................................        5,930        1,323
Number of employees.........................................          710          405
STATUTORY DATA:
Premiums and deposits:
  Individual life...........................................    $    84.9    $    81.6
  Annuities.................................................        173.7         12.4
</TABLE>
 
- - ---------------
 
(A)  Consolidated Income Statement Data includes the results for Delta and
     AmVestors for the three-month period ended March 31, 1998, and Consolidated
     Balance Sheet Data includes period-end data for Delta and AmVestors as of
     March 31, 1998.
 
(B)  Basic earnings per common share for the first quarter of 1998 is calculated
     using 29.73 million weighted average shares of Class A Common Stock and 5
     million shares of Class B Common Stock outstanding. Diluted earnings per
     common share for the first quarter of 1998 is calculated using 29.83
     million weighted average shares of Class A Common Stock and 5 million
     shares of Class B Common Stock outstanding. The basic and diluted earnings
     per common share for the first quarter of 1997 are calculated using 18.16
     million shares of Class A Common Stock and 5 million shares of Class B
     Common Stock outstanding.
 
(C)  For purposes of computing the ratio of earnings to fixed charges, 
     "earnings" consist of income from operations before federal income taxes,
     fixed charges and pre-tax earnings required to cover preferred stock
     dividend requirements. "Fixed charges" consist of interest expense on debt
     and capital securities, amortization of debt expense and interest credited
     on deferred annuities.
 
(D)  Since the Company currently has no preferred stock outstanding, the ratio
     of earnings to fixed charges and preferred stock dividends is the same as
     the ratio of earnings to fixed charges.
 
(E)  Amounts shown include the effects of reporting fixed maturity securities at
     fair value and recording the unrealized appreciation or depreciation on
     such securities as a component of stockholders' equity, net of tax and
     other adjustments. Such adjustments are in accordance with Statement of
     Financial Accounting Standards 115, "Accounting for Certain Investments in
     Debt and Equity Securities," which the Company adopted December 31, 1993.
 
(F)  Adjusted operating income reflects net income adjusted to eliminate certain
     items (net of applicable income taxes) which management believes are not
     necessarily indicative of overall operating trends. For example, net
     realized capital gains or losses on investments, excluding gains or losses
     on convertible debt which are considered core earnings, are eliminated.
     Different items are likely to occur in each period presented and others may
     have different opinions as to which items may warrant adjustment. The
     adjusted operating income shown does not constitute net income computed in
     accordance with GAAP. See "Management's Discussion and Analysis of Results
     of Operations and Financial Condition-Adjusted Operating Income" in the
     accompanying Prospectus.
 
                                       S-6
<PAGE>   7
 
                                  RISK FACTORS
 
     The following risk factor supplements the risk factors contained in the
accompanying Prospectus and should be read in connection with the risk factors
contained therein.
 
UNCERTAINTIES REGARDING THE FUTURE SALE OF EQUITY SECURITIES
 
     The Company is an insurance holding company subject to regulation by the
Iowa Insurance Division. Iowa law requires the prior approval of the
Commissioner for the sale of any stock of the Company, including the Units
Offering. While the Company has no reason to believe that the Commissioner will
disapprove the Units Offering or any other sale of the Company's stock, there
can be no assurance as to the Commissioner's approval of the Units Offering or
any other subsequent offering of the Company's stock. The inability to obtain
approval for the Units Offering from the Commissioner, or the failure to obtain
any required bank consents, would adversely affect the Company's ability to
complete its Refinancing Plan, including the complete repayment of Bank Debt.
The inability to obtain approval for future offerings of the Company's stock
would adversely impact the Company's ability to raise capital for mergers,
acquisitions or other corporate purposes. Moreover, there can be no assurance
that if the Company obtains the approval of the Commissioner to commence the
Units Offering that such offering will be consummated.
 
                                USE OF PROCEEDS
 
     The net proceeds from the sale of the Notes, estimated to be approximately
$123.8 million (after deduction of underwriting discounts and estimated offering
expenses), will be used by the Company to partially repay the $250 million of
Bank Debt. In addition, the Company has made application with the Commissioner
to issue up to $150 million of Units, the proceeds of which will be used to
repay the remaining outstanding Bank Debt, to partially fund a stock repurchase
of up to $75 million of the Company's Class A Common Stock and for general
corporate purposes. The offering made hereby and the Units Offering are
independent offerings and the consummation of either of the offerings is not
conditioned upon the consummation of the other offering. There can be no
assurance that the Units Offering will be consummated. See "Risk Factors" above.
Upon completion of the Notes offering, the Company will retain an open secured
line of credit under the Credit Agreement (as defined herein under "Description
of Notes -- Certain Definitions Applicable to the Notes") in an amount not to
exceed $150 million.
 
                                       S-7
<PAGE>   8
 
                                 CAPITALIZATION
 
     The following table summarizes the actual capitalization of the Company and
its consolidated subsidiaries at March 31, 1998 and such capitalization adjusted
on a pro forma basis to reflect the sale of the Notes offered hereby and an
assumed application of the proceeds from such sale, after underwriting
commissions and estimated expenses of this offering, to repay indebtedness. This
table should be read in conjunction with the Company's Quarterly Report on Form
10-Q for the three months ended March 31, 1998 which is incorporated by
reference in the accompanying Prospectus.
 
<TABLE>
<CAPTION>
                                                                      MARCH 31, 1998
                                                                ---------------------------
                                                                              PRO FORMA FOR
                                                                              THE ISSUANCE
                                                                  ACTUAL      OF THE NOTES
                                                                ----------    -------------
                                                                      (IN THOUSANDS)
<S>                                                             <C>           <C>
Commercial paper and notes payable:
  Bank Debt.................................................    $  266,341     $  141,341
  6.95% Senior Notes due 2005...............................            --        125,000
                                                                ----------     ----------
     Total Debt.............................................       266,341        266,341
  Capital Securities........................................        86,000         86,000
                                                                ----------     ----------
Shareholders' equity:
  Class A Common Stock......................................        29,735         29,735
  Class B Common Stock......................................         5,000          5,000
Accumulated other comprehensive income, net of deferred
  income taxes..............................................        54,099         54,099
Additional paid-in capital..................................       383,686        383,686
Retained earnings...........................................       472,108        472,108
                                                                ----------     ----------
Total shareholders' equity..................................       944,628        944,628
                                                                ----------     ----------
     Total capitalization...................................    $1,296,969     $1,296,969
                                                                ==========     ==========
</TABLE>
 
                                       S-8
<PAGE>   9
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                             RESULTS OF OPERATIONS
 
     The information appearing below has been extracted from Management's
Discussion and Analysis of Results of Operations and Financial Condition
contained in the Company's Quarterly Report on Form 10-Q for the three-month
period ended March 31, 1998 (which is incorporated by reference in the
accompanying Prospectus) and should be read in conjunction with the more
complete information contained therein.
 
RESULTS OF OPERATIONS -- FIRST QUARTER 1998 COMPARED TO FIRST QUARTER 1997
 
REVENUES
 
     Individual life and annuity premiums and product charges increased by $14.3
million, or 73.8%, to $33.6 million for the first quarter of 1998 from $19.3
million for the first quarter of 1997. Included in the 1998 increase were $6.3
million of insurance and annuity premiums and product charges from Delta and
AmVestors. Insurance premiums increased by $9.1 million to $17.3 million for the
first quarter of 1998 compared to $8.2 million for the first quarter of 1997.
Included in the increased insurance premiums in 1998 was $2.0 million from the
acquisitions. Traditional life insurance premiums increased by $5.6 million
primarily as a result of growth in renewal premiums on traditional life
insurance policies not included in the Closed Block (as defined in the
accompanying Prospectus). Immediate annuity deposits and supplementary contract
premiums were $3.5 million higher in 1998 than in 1997 with $1.8 million from
the recent acquisitions of Delta and AmVestors and $1.7 million from increased
immediate annuity and supplementary contract premium sales of AmerUs Life.
 
     Universal life product charges increased by $0.6 million for the first
quarter of 1998 primarily due to increased cost of insurance charges as a result
of the normal aging of the block of business.
 
     Annuity product charges for first quarter 1998 increased by $4.5 million
from 1997 amounts. The increase includes $4.3 million of annuity product charges
from Delta and AmVestors.
 
     Net investment income increased by $82.2 million to $133.1 million for
first quarter 1998. Included in the 1998 increase in net investment income was
$82.6 million of net investment income from Delta and AmVestors. The remaining
$0.4 million decrease in net investment income was attributable to a decrease in
average invested assets (excluding market value adjustments, the Closed Block
and Delta and AmVestors) partially offset by an increase in effective yields on
average invested assets. Average invested assets (excluding market value
adjustments, the Closed Block and Delta and AmVestors) in the first quarter of
1998 decreased by $56.8 million from the first quarter of 1997, primarily as a
result of the continued runoff of AmerUs Life's individual deferred annuity
business. Effective May 1996, substantially all new sales of individual deferred
annuities by AmerUs Life's distribution network have been made through the joint
venture (the "Ameritas Joint Venture") with Ameritas Life Insurance Corp.
pursuant to which AmerUs Life markets fixed annuities issued by Ameritas
Variable Life Insurance Company ("AVLIC") and sells AVLIC's variable life
insurance and variable annuity products. The effective yield on average invested
assets (excluding market value adjustments, the Closed Block and Delta and
AmVestors) increased from 7.22% for the first quarter of 1997 to 7.26% for the
first quarter of 1998.
 
     Realized gains on investments were $6.2 million for the first quarter of
1998 compared to gains of $5.2 million for the first quarter of 1997. Included
in the first quarter amounts were $1.9 million of gains from Delta and
AmVestors.
 
THE CLOSED BLOCK
 
     The Closed Block was established on June 30, 1996. Insurance policies which
had a dividend scale in effect as of June 30, 1996 were included in the Closed
Block as defined in the accompanying Prospectus. The Closed Block was designed
to provide reasonable assurance to owners of insurance policies included therein
that, after the Company's reorganization, assets would be available to maintain
the dividend scales and interest credits in effect prior to the Company's
reorganization if the experience underlying such scales and credits continues.
                                       S-9
<PAGE>   10
 
     The contribution to the operating income of the Company from the Closed
Block is reported as a single line item in the income statement. Accordingly,
premiums, product charges, investment income, realized gains or losses on
investments, policyowner benefits and dividends attributable to the Closed
Block, less certain minor expenses including amortization of deferred policy
acquisition costs, are shown as a net number under the caption "Contribution
from the Closed Block." This results in material reductions in the respective
line items in the income statement while having no effect on net income. The
expenses associated with the administration of the policies included in the
Closed Block and the renewal commissions on these policies are not charged
against the Contribution from the Closed Block, but rather are grouped with
underwriting, acquisition and insurance expenses. Also, all assets allocated to
the Closed Block are grouped together and shown as a separate item entitled
"Closed Block Assets." Likewise, all liabilities attributable to the Closed
Block are combined and disclosed as "Closed Block Liabilities."
 
     The contribution from the Closed Block for the first quarter of 1998 was
$9.0 million compared to $9.3 million for the same period in 1997.
 
     Closed Block insurance premiums decreased by $4.5 million to $50.4 million
for the first quarter of 1998 compared to $54.9 million for the same period in
1997. Insurance policies which had a dividend scale in effect as of June 30,
1996 were included in the Closed Block. The decrease in insurance premiums
reflects a reduction in the Closed Block's traditional life insurance business
in force as a result of the lapse of such business. Similarly, the decrease in
product charges on universal life policies included in the Closed Block is
primarily the result of the reduction of such business in force.
 
     Net investment income for the Closed Block increased by $2.9 million to
$29.2 million for the first quarter of 1998 compared to $26.3 million for the
first quarter of 1997 due primarily to higher average invested assets (excluding
market value adjustments) partially offset by lower effective yields. Average
invested assets (excluding market value adjustments) increased by $125.6 million
and average effective yields decreased by 19 basis points for the Closed Block.
 
     Realized gains on investments of the Closed Block were $0.9 million for the
first quarter of 1998 compared to a $0.6 million realized loss for the same
period in 1997.
 
     Closed Block policyowner benefits were $49.0 million for the first quarter
of 1998 compared to $49.7 million a year ago. The decrease in benefits was
largely the result of lower death benefits on the Closed Block policies.
 
     Insurance expenses for the Closed Block were $1.4 million for the first
quarter of 1998 compared to $1.5 million for the first quarter of 1997. The
decrease in expenses is the result of reduced premium taxes on such business due
to the lower insurance premiums.
 
     The amortization of deferred policy acquisition costs for the Closed Block
increased by $1.2 million to $8.0 million for the first quarter of 1998.
Deferred policy acquisition costs are generally amortized in proportion to gross
margins, including realized capital gains. Lower death benefits and increased
realized capital gains in the first quarter of 1998, compared to the same period
in 1997, contributed to higher gross margins in 1998 on those policies included
in the Closed Block for which deferred costs are amortized, resulting in the
increased amortization in 1998.
 
     Closed Block dividends to policyowners were $16.6 million for the first
quarter of 1998 compared to $17.1 million for the same period in 1997.
 
POLICYOWNER BENEFITS
 
     Total policyowner benefits were $107.3 million for the first quarter of
1998 compared to $45.5 million for the first quarter of 1997, an increase of
$61.8 million. Included in the first quarter 1998 amounts were $63.0 million of
benefits of acquired companies primarily consisting of interest credited to
deferred annuity account balances. Traditional life insurance benefits increased
by $1.0 million in 1998 primarily due to the growth and aging of such business
in force. Universal life insurance benefits were $1.3 million lower in 1998
primarily due to decreased death benefits as a result of lower mortality.
 
                                      S-10
<PAGE>   11
 
     Annuity benefits increased by $62.0 million for the first quarter of 1998
to $85.8 million compared to $23.8 million for the first quarter of 1997.
Included in the first quarter 1998 annuity benefits were $62.0 million
attributable to the recent acquisitions of Delta and AmVestors. AmerUs Life's
annuity benefits were $23.8 million for both the first quarters of 1998 and
1997. Interest credited to AmerUs Life's policyowner account balances decreased
by $1.8 million to $13.6 million for the first quarter of 1998 compared to $15.4
million for the same period in 1997. The weighted average crediting rate for
AmerUs Life's individual deferred annuity liabilities decreased by 19 basis
points from 5.48% for the first quarter of 1997 to 5.29% for the first quarter
of 1998, and AmerUs Life's average deferred annuity liabilities decreased by
$110.4 million from the first quarter of 1997 to the same period in 1998 also
contributing to the lower credited amounts in 1998. Other annuity benefits for
AmerUs Life increased by $1.8 million to $10.2 million for the first quarter of
1998 compared to $8.4 million for the first quarter of 1997, primarily as a
result of increased immediate annuity and supplementary contract premium sales.
 
EXPENSES
 
     The Company's commission expense, net of deferrals, increased by $1.0
million to $3.1 million for the first quarter of 1998 compared to $2.1 million
for the first quarter of 1997. Included in the increase is $0.4 million of
commission expense, net of deferrals, from the recent acquisitions. Other
underwriting, acquisition and insurance expenses, net of deferrals, increased by
$16.0 million to $24.9 million for the first quarter of 1998. Included in the
1998 amounts is $15.7 million of expenses for the recently acquired companies,
including $1.8 million of goodwill amortization and $6.7 million of amortization
of value of business acquired. Excluding recently acquired companies, other
underwriting, acquisition and insurance expenses, net of deferrals, increased by
$0.3 million.
 
     The amortization of deferred policy acquisition costs increased by $3.1
million to $8.2 million in the first quarter of 1998 compared to $5.1 million in
the first quarter of 1997. Deferred policy acquisition costs are generally
amortized in proportion to gross margins, including realized capital gains.
Lower death benefits and increased realized capital gains in the first quarter
of 1998, compared to the first quarter of 1997, contributed to higher gross
margins in 1998 on products for which deferred costs are amortized, resulting in
the increased amortization in 1998.
 
INCOME FROM OPERATIONS
 
     Income from operations increased by $15.1 million to $38.2 million for the
first quarter of 1998 compared to $23.1 million for the same period in 1997,
with the recent acquisitions of Delta and AmVestors adding $12.2 million of
income from operations during the first quarter of 1998. Improved product
margins, in large part due to the result of better mortality, contributed to the
remaining increase in income from operations in 1998.
 
INTEREST EXPENSE
 
     Interest expense increased by $3.7 million in the first quarter of 1998 to
$6.7 million compared to $3.0 million for the first quarter of 1997. The
increased interest expense in the first quarter of 1998 was due to increased
interest expense on the capital securities issued by the Company on February 3,
1997 and increased interest expense on the revolving line of credit as a result
of increased debt levels.
 
INCOME BEFORE INCOME TAX EXPENSE
 
     Income before income tax expense and equity in earnings of unconsolidated
subsidiary increased by $11.4 million to $31.5 million for the first quarter of
1998 compared to $20.1 million for the first quarter of 1997, with the recent
acquisitions of Delta and AmVestors adding $12.2 million to such income for the
first quarter of 1998.
 
                                      S-11
<PAGE>   12
 
INCOME TAX EXPENSE
 
     Income tax expense increased by $4.4 million to $10.1 million for the first
quarter of 1998 compared to $5.7 million for the same period of 1997. The
increase in income tax expense was primarily due to the higher pre-tax income,
including income from the recent acquisitions of Delta and AmVestors. The
effective income tax rate for the first quarter of 1998 was 32.3% compared to
28.5% for the first quarter of 1997. The higher effective tax rate in 1998 was
in part attributable to the non-deductibility of the amortization of goodwill
resulting from the recent acquisitions. In addition, relatively similar amounts
of tax credits in 1998 and 1997 had a greater impact on reducing the effective
tax rate for the first quarter of 1997 due to the lower income in the first
quarter of 1997.
 
NET INCOME
 
     Net income increased by $7.2 million to $21.8 million for the first quarter
of 1998 compared to $14.6 million for the same period in 1997, with the recent
acquisitions of Delta and AmVestors adding $6.8 million of net income for the
first quarter of 1998.
 
                                      S-12
<PAGE>   13
 
                              DESCRIPTION OF NOTES
 
     The Notes are an issue of the Company's Senior Debt Securities (as
described in the accompanying Prospectus as "Senior Indebtedness"). The
following description of the terms of the Notes supplements the description of
the Senior Indebtedness contained in the accompanying Prospectus, should be read
in conjunction with the "Description of Debt Securities" contained in the
accompanying Prospectus and is qualified in its entirety by reference to the
terms and provisions of the Notes.
 
GENERAL
 
     The Notes are to be issued as a separate series under an indenture, to be
dated as of June 16, 1998 (the "Senior Indenture"), between the Company and
First Union National Bank, as trustee (the "Trustee"). Capitalized terms not
otherwise defined in this Prospectus Supplement have the meanings given to them
in the accompanying Prospectus and the Senior Indenture.
 
     The Notes will be limited to $125,000,000 in aggregate principal amount and
will mature on June 15, 2005. The Notes will be unsecured and will rank pari
passu with all other unsecured and unsubordinated obligations of the Company. At
March 31, 1998, the Company had no unsecured and unsubordinated indebtedness
outstanding. In addition, the Company's subsidiaries had $16.3 million of
indebtedness outstanding at March 31, 1998, which would be structurally senior
to the Notes. The Senior Indenture does not limit the aggregate amount of Senior
Indebtedness that may be issued thereunder, nor does it limit the incurrence or
issuance of other secured or unsecured debt of the Company or its subsidiaries.
Senior Indebtedness may be issued from time to time in one or more series up to
the aggregate amount from time to time authorized by the Company for each
series.
 
     The Notes will bear interest at the rate per annum shown on the cover page
of this Prospectus Supplement from June 16, 1998 or from the most recent
Interest Payment Date to which interest has been paid or provided for, payable
semiannually in arrears on June 15 and December 15 of each year, commencing
December 15, 1998 (each an "Interest Payment Date"), to the persons in whose
names such Notes were registered at the close of business on the next preceding
June 1 and December 1, whether or not a Business Day (as defined below) (each a
"Regular Record Date"), respectively. Interest on the Notes will be computed on
the basis of a 360-day year comprised of twelve 30-day months.
 
     Interest payable on a Note on any Interest Payment Date or at maturity
shall be the amount of interest accrued from and including the next preceding
Interest Payment Date in respect of which interest has been paid or provided for
(or from and including June 16, 1998, if no interest has been paid or provided
for with respect to such Note) to, but excluding, the Interest Payment Date or
the date of maturity, as the case may be. If any Interest Payment Date or the
maturity date of a Note falls on a day that is not a Business Day, the payment
shall be made on the next Business Day as if it were made on the date such
payment was due and, provided such payment is made on the next Business Day, no
interest shall accrue on the amount so payable for the period from and after
such Interest Payment Date or the maturity date, as the case may be. "Business
Day" means any day, other than a Saturday, Sunday, legal holiday, or other day
on which banks in The City of New York are required or authorized by law,
regulation or executive order to close. Interest on the Notes will be computed
on the basis of a 360-day year comprised of twelve 30-day months.
 
     The provisions of Article Four of the Indenture relating to defeasance and
covenant defeasance, described in the accompanying Prospectus under "Description
of Debt Securities -- Defeasance and Covenant Defeasance," are applicable to the
Notes.
 
LIMITATIONS UPON LIENS
 
     Under the terms of the Notes, the Company will not, nor will it permit any
Restricted Subsidiary (as defined herein) to, issue, assume or guarantee any
indebtedness for money borrowed if such indebtedness is secured by a Lien (as
defined herein) upon any Principal Property (as defined herein) of the Company
or any Restricted Subsidiary or on any shares of capital stock of any Restricted
Subsidiary (whether such Principal Property or shares of capital stock are now
owned or hereafter acquired) without in any such case effectively
 
                                      S-13
<PAGE>   14
 
providing that the Notes (together with, if the Company shall so determine, any
other indebtedness of or indebtedness guaranteed by the Company or such
Restricted Subsidiary entitled thereto (subject to applicable priority of
payment)) shall be secured equally and ratably with or prior to such
indebtedness, except that the foregoing restriction shall not apply to (i) Liens
on property or assets (including shares of stock or other equity interests) of
any Subsidiary existing at the time such Subsidiary becomes a Restricted
Subsidiary; (ii) Liens on property or assets (including shares of stock or other
equity interests) existing at the time of acquisition thereof, or Liens on
property or assets (including shares of stock or other equity interests) which
secure the payment of the purchase price of such property or assets (including
shares of stock or other equity interests) (such purchase price including any
indebtedness assumed or repaid in connection with such purchase), or Liens on
property or assets (including shares of stock or other equity interests) which
secure indebtedness incurred or guaranteed for the purpose of financing or
refinancing the purchase price of such property or assets (including shares of
stock or other equity interests) or the construction of such property or assets
(including improvements to existing property or assets), which indebtedness is
incurred or guaranteed within 180 days after the latest of such acquisition or
completion of such construction or commencement of operation of such property or
assets and which does not exceed 100% of such purchase price; (iii) Liens
securing indebtedness owing by any Restricted Subsidiary to the Company or a
wholly owned Restricted Subsidiary; (iv) Liens on property or assets (including
shares of stock or other equity interests) of a corporation existing at the time
such corporation is merged into or consolidated with the Company or a Restricted
Subsidiary or at the time of a purchase, lease, or other acquisition of the
properties or assets (including shares of stock or other equity interests) of a
corporation or other Person as an entirety or substantially as an entirety by
the Company or a Restricted Subsidiary; (v) Liens on property or assets
(including shares of stock or other equity interests) of the Company or a
Restricted Subsidiary in favor of the United States of America or any State
thereof or any department, agency, instrumentality or political subdivision
thereof, or in favor of any other country, or any political subdivision thereof,
to secure any indebtedness incurred or guaranteed for the purpose of financing
all or any part of the purchase price or the cost of construction of the
property or assets (including shares of stock or other equity interests) subject
to such Liens within 180 days after the latest of the acquisition, completion of
construction or commencement of operation of such property or assets (including
shares of stock or other equity interests), provided that the principal amount
of any indebtedness secured by such a Lien does not exceed 100% of such purchase
price or cost and such Lien does not extend to or cover any property or assets
(including shares of stock or other equity interests) other than the specific
item of property or assets (including shares of stock or other equity interests)
(or portion thereof) acquired, constructed or constituting the improvements made
with the proceeds of such Indebtedness and the proceeds thereof; (vi) Liens
imposed by or in favor of any governmental authority for taxes, assessments or
other charges which are not yet due or which are being contested in good faith
and by appropriate proceedings and for which adequate reserves shall have been
established on the books of the Company or any of its Restricted Subsidiaries;
(vii) (A) Pledges or deposits to secure the Company's or any Restricted
Subsidiary's obligations under worker's compensation laws, unemployment
insurance laws or similar legislation and (B) materialmen's, mechanics',
carriers', repairmen's or other like Liens, or deposits to obtain the release of
such Liens, in an aggregate amount not exceeding $250,000 at any one time and
outstanding no longer than 30 days; in each case, however, only to the extent
arising and continuing in the ordinary course of business; (viii) Easements,
rights-of-way, restrictions and other similar encumbrances affecting real
property incurred in the ordinary course of business which, in the aggregate,
are not substantial in amount and which do not in any case materially detract
from the value of the property subject thereto or interfere with the ordinary
conduct of the business of the Company; (ix) Landlord's Liens for rental not yet
due and payable; (x) Liens which secure statutory obligations of the Company or
any Person controlling the Company which are required by the Commissioner
pursuant to Section 521A.14 of the Iowa Code or otherwise; (xi) Liens upon any
property or assets (including shares of stock or other equity interests) of the
Company and its Restricted Subsidiaries securing indebtedness under the Credit
Agreement in a principal amount not exceeding the principal amount outstanding
or committed under the Credit Agreement; (xii) Liens on property or assets
(including shares of stock or other equity interests) of the Company or any
Restricted Subsidiary outstanding as of the date of the Senior Indenture; (xiii)
Liens on proceeds of any property or assets (including shares of stock or other
equity interests) subject to Lien as permitted by the terms of the Notes; (xiv)
Liens on property or assets (including shares of stock or other equity
interests) used to defease indebtedness not in violation of the terms of the
Notes; or (xv) any
                                      S-14
<PAGE>   15
 
extension, renewal or replacement (or successive extensions, renewals or
replacements), in whole or in part, of any Liens referred to in the foregoing
clauses (i) through (xiv), inclusive; provided, however, that the principal
amount of such indebtedness secured thereby shall not exceed the principal
amount of such indebtedness so secured at the time of such extension, renewal or
replacement, and that such extension, renewal or replacement shall be limited to
all or a part of the property or assets (including shares of stock or other
equity interests) which secured the Lien so extended, renewed or replaced (plus
improvements and construction on such property or assets (including shares of
stock or other equity interests)). Notwithstanding the above, the Company and
one or more Restricted Subsidiaries may, without securing the Notes, issue,
assume or guarantee secured indebtedness which would otherwise be subject to the
foregoing restrictions, provided that after giving effect thereto, the aggregate
amount of such indebtedness issued pursuant to such exception at such time does
not exceed 10% of Consolidated Net Tangible Assets (as defined herein). In
computing the aggregate amount of indebtedness outstanding for purposes of the
foregoing sentence, there shall not be included in the calculation any
indebtedness issued, assumed or guaranteed pursuant to clauses (i) through (xv)
above.
 
LIMITATION ON DISPOSITION OF STOCK OF RESTRICTED SUBSIDIARIES
 
     So long as the Notes are outstanding and except in a transaction otherwise
governed by the Senior Indenture, the Company may not issue, sell, convey,
lease, transfer or otherwise dispose of any shares of securities convertible or
exchangeable into, or warrants, rights or options to subscribe for or purchase
shares of capital stock (other than preferred stock having no voting rights of
any kind, except as required by law or in the event of non-payment of dividends)
of any Restricted Subsidiary, nor will it permit any Restricted Subsidiary to
issue (other than to the Company) any shares (other than director's qualifying
shares) of, or securities convertible or exchangeable into, or warrants, rights
or options to subscribe for or purchase shares of, capital stock (other than
preferred stock having no voting rights of any kind, except as required by law
or in the event of non-payment of dividends) of any Restricted Subsidiary, if,
after giving effect to any such transaction and the issuance of the maximum
number of shares issuable upon the conversion or exercise of all such
convertible securities, warrants, rights or options, the Company would own,
directly or indirectly, less than 80% of the capital stock of any Restricted
Subsidiary (other than preferred stock having no voting rights of any kind,
except as required by law or in the event of non-payment of dividends);
provided, however, that (i) any issuance, sale, conveyance, lease, transfer or
other disposition permitted by the Company may only be made for at least fair
market value as determined by the Board of Directors pursuant to a Board
Resolution adopted in good faith, and (ii) the foregoing shall not prohibit any
such issuance, sale, conveyance, lease, transfer or disposition of securities if
required by any law or any regulation or order of any governmental or insurance
regulatory authority. Notwithstanding the foregoing, (x) the Company may merge
or consolidate any of its Restricted Subsidiaries into or with another direct
wholly owned Subsidiary of the Company and (y) the Company may, subject to the
provisions set forth in "Description of Debt Securities -- Consolidation, Merger
or Sale by the Company" in the accompanying Prospectus, sell, convey, lease,
transfer or otherwise dispose of the entire capital stock of any Restricted
Subsidiary at one time for at least a fair market value consideration as
determined by the Board of Directors pursuant to a Board Resolution adopted in
good faith.
 
CERTAIN DEFINITIONS APPLICABLE TO THE NOTES
 
     "Consolidated Net Tangible Assets" means the total amount of assets (less
applicable reserves and other properly deductible items) after deducting
therefrom (i) all current liabilities (excluding any thereof which are by their
terms extendible or renewable at the option of the obligor thereon to a time
more than twelve months after the time as of which the amount thereof is being
computed), and (ii) all goodwill, trade names, trademarks, patents, unamortized
debt discount and expense and other like intangibles, all as set forth on the
most recent balance sheet of the Company and its consolidated Subsidiaries and
prepared in accordance with GAAP.
 
     "Credit Agreement" means the Revolving Credit and Term Loan Agreement,
dated as of October 23, 1997, by and among the Company, the signatory banks
thereto and The Chase Manhattan Bank, as administrative agent, as amended,
modified, supplemented or restated from time to time, or refunded, refinanced,
restructured, repaid, renewed, extended, replaced or succeeded (regardless of
any gaps in time),
 
                                      S-15
<PAGE>   16
 
whether with the same or different agents and lenders, on one or more occasions;
provided, however, that in the event that the Credit Agreement is amended,
modified, supplemented or restated, or refunded, refinanced, restructured,
repaid, renewed, extended, replaced or succeeded after the date of the Senior
Indenture, the Credit Agreement and such amendment, modification, supplement,
restatement, refunding, refinancing, restructuring, repayment, renewal,
extension, replacement or succeeding agreement will not be a "Credit Agreement"
for the purposes of this definition if the amount outstanding or committed
thereunder at any time exceeds in the aggregate principal amount $150 million.
 
     "Lien" means any mortgage, deed of trust, pledge, lien, security interest
or other encumbrance, (including, without limitation, any conditional sale or
other title retention agreement or lease in the nature thereof, any filing or
agreement to give a lien or file a financing statement as a debtor under the
Uniform Commercial Code or any similar statute other than to reflect ownership
by a third party of property leased to the Company or any Restricted Subsidiary
under a lease which is not in the nature of a conditional sale or title
retention agreement).
 
     "Principal Property" means all land, buildings, machinery and equipment,
and leasehold interests and improvements in respect of the foregoing, which
would be reflected on a consolidated balance sheet of the Company and its
Subsidiaries prepared in accordance with GAAP, excluding all such tangible
property located outside the United States of America and excluding any such
property which, in the opinion of the Board of Directors set forth in a Board
Resolution, is not material to the Company and its consolidated Subsidiaries
taken as a whole.
 
     "Restricted Subsidiary" means a Subsidiary which is a regulated insurance
company principally engaged in one or more of the life, annuity, property and
casualty insurance businesses; provided that no such Subsidiary shall be a
Restricted Subsidiary if (i) (a) the total assets of such Subsidiary are less
than 10% of the total assets of the Company and its consolidated Subsidiaries
(including such Subsidiary), in each case as set forth on the most recent fiscal
year-end balance sheets of such Subsidiary and the Company and its consolidated
Subsidiaries, respectively, and computed in accordance with GAAP and (b) the
total revenues of such Subsidiary are less than 10% of the total revenues of the
Company and its consolidated Subsidiaries (including such Subsidiary), in each
case as set forth on the most recent fiscal year-end income statements of such
Subsidiary and the Company and its consolidated Subsidiaries, respectively, and
computed in accordance with GAAP or (ii) the Subsidiary is an Unrestricted
Subsidiary.
 
     "Subsidiary" means, with respect to any Person, (i) a corporation more than
50% of the combined voting power of the outstanding Voting Stock of which is
owned, directly or indirectly, by such Person or by one or more other
Subsidiaries of such Person or by such Person and one or more Subsidiaries
thereof, (ii) any other Person (other than a corporation) in which such Person,
or one or more other Subsidiaries of such Person or such Person and one or more
other Subsidiaries thereof, directly or indirectly, has at least a majority
ownership and power to direct the policies, management and affairs thereof, or
(iii) any other Person which is otherwise controlled by such Person or by one or
more other Subsidiaries of such Person or by such Person and one or more other
Subsidiaries of such Person.
 
     "Unrestricted Subsidiary" means (i) a Subsidiary of the Company which
becomes a Subsidiary after the date of the Senior Indenture which has been
designated as an "Unrestricted Subsidiary" for purposes of the Senior Indenture
by the Board of Directors, as evidenced by a Board Resolution, and at least 20%
of whose common stock is held by one or more persons (other than the Company and
its Affiliates) which acquired such common stock in a bona fide transaction or
series of transactions for fair value or (ii) in the judgment of the Board of
Directors, as evidenced by a Board Resolution, such Subsidiary is not material
to the financial condition of the Company and its consolidated Subsidiaries
taken as a whole.
 
SAME-DAY SETTLEMENT AND PAYMENT
 
     Settlement for the Notes will be made by the Underwriters in immediately
available funds. All payments of principal and interest will be made by the
Company in U.S. dollars in immediately available funds.
 
     The Notes will trade in the Same-Day Funds Settlement System of the
Depository (as defined herein) until maturity, and secondary market trading
activity in the Notes will therefore be required by the Depository to settle in
immediately available funds.
 
                                      S-16
<PAGE>   17
 
BOOK-ENTRY, DELIVERY AND FORM
 
     The Notes will be issued in fully-registered form, without coupons, in
denominations of $1,000 and integral multiples thereof, through the facilities
of DTC, New York, New York (the "Depository").
 
     The Company has established a depositary arrangement with the Depository
with respect to the Notes, the terms of which are summarized below. The Notes
will be represented by global Notes registered in the name of the nominee of the
Depository. Beneficial interests in each Note will be shown on, and transfers
thereof will be effected only through, records maintained by the Depository
(with respect to beneficial interests of Participants (as defined below)) or by
Participants or persons that hold interests through Participants (with respect
to beneficial interests of persons that hold interests through Participants).
 
     So long as the Depository or its nominee is the registered owner of the
Notes, the Depository or its nominee, as the case may be, will be the sole
Holder of the Notes represented thereby for all purposes under the Senior
Indenture. Except as otherwise provided below, the Beneficial Owners (as defined
below) of the Notes will not be entitled to receive physical delivery of
certificated Notes and will not be considered the Holders thereof for any
purpose under the Senior Indenture, and no Notes shall be exchangeable or
transferable. Accordingly, each Beneficial Owner must rely on the procedures of
the Depository and, if such Beneficial Owner is not a Participant, on the
procedures of the Participant through which such Beneficial Owner owns its
interest in order to exercise any rights of a Holder under such Note or the
Senior Indenture. The laws of some jurisdictions require that certain purchasers
of securities take physical delivery of such securities in certificated form.
Such limits and laws may impair the ability to transfer beneficial interests in
the Notes.
 
     The following is based on information furnished by the Depository:
 
          The Depository will act as securities depository for the Notes. The
     Notes will be issued as fully registered securities registered in the name
     of Cede & Co. (the Depository's partnership nominee). One global Note will
     be issued with respect to the Notes.
 
          The Depository is a limited-purpose trust company organized under the
     New York Banking Law, a "banking organization" within the meaning of the
     New York Banking Law, a member of the Federal Reserve System, a "clearing
     corporation" within the meaning of the New York Uniform Commercial Code,
     and a "clearing agency" registered pursuant to the provisions of Section
     17A of the Securities Exchange Act of 1934, as amended. The Depository
     holds securities that its participants ("Participants") deposit with the
     Depository. The Depository also facilitates the settlement among
     Participants of securities transactions, such as transfers and pledges, in
     deposited securities through electronic computerized book-entry changes in
     Participants' accounts, thereby eliminating the need for physical movement
     of securities certificates. Direct Participants of the Depository ("Direct
     Participants") include securities brokers and dealers, such as the
     Underwriters, banks, trust companies, clearing corporations and certain
     other organizations. The Depository is owned by a number of its Direct
     Participants and by the New York Stock Exchange, Inc., the American Stock
     Exchange, Inc., and the National Association of Securities Dealers, Inc.
     Access to the Depository's system is also available to others such as
     securities brokers and dealers, banks and trust companies that clear
     through or maintain a custodial relationship with a Direct Participant,
     either directly or indirectly ("Indirect Participants"). The rules
     applicable to the Depository and its Participants are on file with the
     Securities and Exchange Commission.
 
          Purchases of Notes under the Depository's system must be made by or
     through Direct Participants, which will receive a credit for such Notes on
     the Depository's records. The ownership interest of each actual purchaser
     of each Note represented by a global Note ("Beneficial Owner") is in turn
     to be recorded on the records of Direct Participants and Indirect
     Participants. Beneficial Owners will not receive written confirmation from
     the Depository of their purchase, but Beneficial Owners are expected to
     receive written confirmations providing details of the transaction, as well
     as periodic statements of their holdings, from the Direct Participants or
     Indirect Participants through which such Beneficial Owner entered into the
     transaction. Transfers of ownership interests in the Notes are to be
     accomplished by entries made on the books of Participants acting on behalf
     of Beneficial Owners. Beneficial Owners of Notes will not receive
     certificated Notes representing their ownership interests therein, except
     in the
 
                                      S-17
<PAGE>   18
 
     event that use of the book-entry system for the Notes is discontinued or a
     Default or an Event of Default (as defined in the Senior Indenture) has
     occurred and is continuing.
 
          To facilitate subsequent transfers, all Notes which are deposited
     with, or on behalf of, the Depository are registered in the name of the
     Depository's nominee, Cede & Co. The deposit of Notes with, or on behalf
     of, the Depository and their registration in the name of Cede & Co. effect
     no change in beneficial ownership. The Depository has no knowledge of the
     actual Beneficial Owners of the Notes; the Depository's records reflect
     only the identity of the Direct Participants to whose accounts such Notes
     are credited, which may or may not be the Beneficial Owners. The
     Participants will remain responsible for keeping account of their holdings
     on behalf of their customers.
 
          Conveyance of notices and other communications by the Depository to
     Direct Participants, by Direct Participants to Indirect Participants, and
     by Direct Participants and Indirect Participants to Beneficial Owners will
     be governed by arrangements among them, subject to any statutory or
     regulatory requirements as may be in effect from time to time.
 
          Neither the Depository nor Cede & Co. will consent or vote with
     respect to the Notes. Under its usual procedures, the Depository mails an
     Omnibus Proxy to the Company as soon as possible after the applicable
     record date. The Omnibus Proxy assigns Cede & Co.'s consenting or voting
     rights to those Direct Participants to whose accounts the Notes are
     credited on the applicable record date (identified in a listing attached to
     the Omnibus Proxy).
 
          Principal, premium, if any, and/or interest payments on the Notes will
     be made in immediately available funds to the Depository. The Depository's
     practice is to credit Direct Participants' accounts on the applicable
     payment date in accordance with their respective holdings shown on the
     Depository's records unless the Depository has reason to believe that it
     will not receive payment on such date. Payments by Participants to
     Beneficial Owners will be governed by standing instructions and customary
     practices, as is the case with securities held for the accounts of
     customers in bearer form or registered in "street name", and will be the
     responsibility of such Participant and not of the Underwriters, the
     Depository, the Trustee or the Company, subject to any statutory or
     regulatory requirements as may be in effect from time to time. Payment of
     principal, premium, if any, and/or interest, if any, to the Depository is
     the responsibility of the Company and the Trustee, disbursement of such
     payments to Direct Participants shall be the responsibility of the
     Depository, and disbursement of such payments to the Beneficial Owners
     shall be the responsibility of Direct Participants and Indirect
     Participants.
 
          Redemption notices shall be sent to Cede & Co. If less than all of the
     Notes are being redeemed, the Depository's practice is to determine by lot
     the amount of the interest of each Direct Participant in such issue to be
     redeemed.
 
          The Depository may discontinue providing its services as securities
     depository with respect to the Notes at any time by giving reasonable
     notice to the Company or the Trustee. Under such circumstances, in the
     event that a successor securities depository is not obtained, certificated
     Notes are required to be printed and delivered.
 
          The Company may decide to discontinue use of the system of book-entry
     transfers through the Depository (or a successor securities depository). In
     that event, certificated Notes will be printed and delivered.
 
     The information in this section concerning the Depository and the
Depository's system has been obtained from sources that the Company believes to
be reliable, but the Company takes no responsibility for the accuracy thereof.
 
     First Union National Bank maintains commercial banking relationships with
the Company.
 
                                      S-18
<PAGE>   19
 
                                  UNDERWRITING
 
     Under the terms and subject to the conditions contained in an underwriting
agreement and pricing agreement (referred to herein collectively as the
"Underwriting Agreement") between the Company and the Underwriters named below
(the "Underwriters"), the Company has agreed to sell to each of the
Underwriters, and each of the Underwriters has severally but not jointly agreed
to purchase from the Company, the following respective principal amounts of the
Notes:
 
<TABLE>
<CAPTION>
                                                               PRINCIPAL AMOUNT
                        UNDERWRITERS                               OF NOTES
                        ------------                           ----------------
<S>                                                           <C>
Salomon Brothers Inc .......................................     $ 43,750,000
Goldman, Sachs & Co. .......................................       43,750,000
Chase Securities Inc. ......................................       18,750,000
Credit Suisse First Boston Corporation .....................       18,750,000
                                                                 ------------
     Total..................................................     $125,000,000
                                                                 ============
</TABLE>
 
     The Underwriting Agreement provides that the obligations of the
Underwriters to pay for and accept delivery of the Notes are subject to certain
conditions precedent, that the Underwriting Agreement may be terminated under
certain circumstances and that the Underwriters will be obligated to purchase
all of the Notes if any are purchased.
 
     The Company has been advised by the Underwriters that the Underwriters
propose initially to offer the Notes to the public at the public offering price
set forth on the cover page of this Prospectus Supplement and to certain dealers
at such price less a concession not in excess of .375% of the principal amount
of the Notes. The Underwriters may allow, and such dealers may reallow, a
concession to certain other dealers not in excess of .250% of the principal
amount of the Notes. After the initial public offering, the public offering
price and such concessions to dealers may be changed from time to time.
 
     The Underwriting Agreement provides that the Company will indemnify the
several Underwriters against certain civil liabilities, including liabilities
under the Securities Act of 1933, as amended, or contribute to payments that the
Underwriters may be required to make in respect thereof.
 
     The Notes are a new issue of securities with no established trading market.
The Company does not intend to apply for listing of the Notes on a national
securities exchange, but has been advised by the Underwriters that they
presently intend to make a market in the Notes, as permitted by applicable laws
and regulations. The Underwriters are not obligated, however, to make a market
in the Notes, and any such market making may be discontinued at any time without
notice at the sole discretion of the Underwriters. Accordingly, no assurance can
be given as to the liquidity of, or the trading market for, the Notes.
 
     The Underwriters and certain of their affiliates and associates may be
customers of, have borrowing relationships with, engage in transactions with,
and/or perform services, including investment banking services, for, the Company
and its subsidiaries in the ordinary course of business. The Chase Manhattan
Bank, an affiliate of Chase Securities Inc., is the administrative agent and a
lender under the Credit Agreement and will receive a portion of any amounts
repaid under the Credit Agreement with the net proceeds of the offering. See
"Use of Proceeds."
 
     In connection with this offering, certain Underwriters and selling group
members and their respective affiliates may engage in transactions that
stabilize, maintain or otherwise affect the market price of the Notes. Such
transactions may include stabilization transactions effected in accordance with
Rule 104 of Regulation M under the Securities Exchange Act of 1934, as amended,
pursuant to which such persons may bid for or purchase Notes for the purpose of
stabilizing their market price. The Underwriters also may create a short
position for their respective accounts by selling more Notes in connection with
this offering than they are committed to purchase from the Company, and in such
case may purchase Notes in the open market following completion of this offering
to cover all or a portion of such short position. In addition, Salomon Brothers
Inc, on behalf of the Underwriters, may impose "penalty bids" under contractual
arrangements between the Underwriters whereby it may reclaim from an Underwriter
(or dealer participating in this offering) for the
 
                                      S-19
<PAGE>   20
 
account of the Underwriters, the selling concession with respect to Notes that
are distributed in this offering but subsequently purchased for the account of
the Underwriters in the open market. Any of the transactions described in this
paragraph may result in the maintenance of the price of the Notes at a level
above that which might otherwise prevail in the open market. None of the
transactions described in this paragraph is required, and, if they are
undertaken, they may be discontinued at any time.
 
                               VALIDITY OF NOTES
 
     The validity of the Notes will be passed upon for the Company by Sidley &
Austin and for the Underwriters by Sullivan & Cromwell, New York, New York.
Sidley & Austin and Sullivan & Cromwell will rely on the opinion of Joseph K.
Haggerty, Esq., Senior Vice President and General Counsel of the Company, as to
matters of Iowa law.
 
                                      S-20
<PAGE>   21
 
PROSPECTUS
 
                                  $750,000,000
                           AMERUS LIFE HOLDINGS, INC.
  DEBT SECURITIES, PREFERRED STOCK, CLASS A COMMON STOCK, PURCHASE CONTRACTS,
                               UNITS AND WARRANTS
 
                               AMERUS CAPITAL II
 
                               AMERUS CAPITAL III
            CAPITAL SECURITIES FULLY AND UNCONDITIONALLY GUARANTEED
                    BY AMERUS LIFE HOLDINGS, INC. AND UNITS
                               ------------------
 
    AmerUs Life Holdings, Inc., an Iowa corporation (the "Company"), may offer
and sell from time to time, in one or more series, (i) its debt securities,
consisting of debentures, notes and/or other evidences of indebtedness
representing unsecured obligations of the Company (the "Debt Securities"), (ii)
shares of its preferred stock, no par value per share ("Preferred Stock"), (iii)
shares of its Class A Common Stock, no par value per share ("Class A Common
Stock"), (iv) Purchase Contracts ("Purchase Contracts") to purchase shares of
Class A Common Stock, (v) Units, each representing ownership of a Purchase
Contract and Capital Securities (as defined herein) or debt obligations of third
parties, including U.S. Treasury securities, securing the holder's obligation to
purchase Class A Common Stock under the Purchase Contracts ("Units"), including
but not limited to, Adjustable Conversion-rate Equity Security Units and (vi)
warrants to purchase Debt Securities, Preferred Stock, Class A Common Stock or
other securities or rights ("Warrants").
 
    AmerUs Capital II and AmerUs Capital III (each, an "AmerUs Trust"),
statutory business trusts formed under the laws of the State of Delaware, may
offer, from time to time, Capital Securities, representing preferred undivided
beneficial interests in the assets of the respective AmerUs Trusts ("Capital
Securities"). The payment of periodic cash distributions ("Distributions") with
respect to Capital Securities out of moneys held by each of the AmerUs Trusts,
and payments on liquidation, redemption or otherwise with respect to such
Capital Securities, will be guaranteed by the Company to the extent described
herein (each, a "Guarantee"). See "Description of Capital Securities of the
AmerUs Trusts" and "Description of Guarantees." The Company's obligations under
the Guarantees will rank junior and subordinate in right of payment to the
Senior Indebtedness (as defined herein) of the Company. See "Description of
Guarantees -- Status of the Guarantees." Junior subordinated debt ("Junior
Subordinated Debt") may be issued and sold by the Company in one or more series
to an AmerUs Trust or a trustee of such AmerUs Trust in connection with the
investment of the proceeds from the offering of Capital Securities and Common
Securities (as defined herein) of such AmerUs Trust. The Junior Subordinated
Debt purchased by an AmerUs Trust may be subsequently distributed pro rata to
holders of Capital Securities and Common Securities in connection with the
dissolution of such AmerUs Trust. The Junior Subordinated Debt will rank junior
and subordinate in right of payment to the Senior Indebtedness of the Company.
The Debt Securities, Preferred Stock, Class A Common Stock, Purchase Contracts,
Units, Warrants and Capital Securities are herein collectively referred to as
the "Securities."
 
    Certain specific terms of the particular Securities in respect of which this
Prospectus is being delivered will be set forth in an accompanying supplement to
this Prospectus (the "Prospectus Supplement"), which will describe, without
limitation and where applicable, the following: (i) in the case of Debt
Securities, the specific designation, aggregate principal amount, ranking as
senior or subordinated Debt Securities, denomination, maturity, premium, if any,
interest rate (which may be fixed or variable), time and method of calculating
interest, if any, place or places where principal of, premium, if any, and
interest, if any, on such Debt Securities will be payable, the currencies or
currency units in which principal of, premium, if any, and interest, if any, on
such Debt Securities will be payable, any terms of redemption or conversion, any
sinking fund provisions, the purchase price, any listing on a securities
exchange, any right of the Company to defer payment of interest on the Junior
Subordinated Debt and the maximum length of such deferral period, the method of
distribution and other special terms; (ii) in the case of Preferred Stock, the
specific designation, stated value and liquidation preference per share and
number of shares offered, the initial public offering or purchase price,
dividend rate (which may be fixed or variable), method of calculating payment of
dividends, place or places where dividends on such Preferred Stock will be
payable, any terms of redemption, dates on which dividends shall be payable and
dates from which dividends shall accrue, any listing on a securities exchange,
voting and other rights, including conversion or exchange rights, if any, the
method of distribution, and other special terms; (iii) in the case of Class A
Common Stock, the number of shares offered, the initial offering price, market
price and dividend information and the method of distribution; (iv) in the case
of Purchase Contracts, the number of shares of Class A Common Stock issuable
thereunder, the purchase price of the Class A Common Stock, the date or dates on
which the Class A Common Stock is required to be purchased by the holders of the
Purchase Contracts, any periodic payments or contract fees required to be paid
by the Company to the holders of the Purchase Contracts or vice versa, and the
terms of the offering and sale thereof; (v) in the case of Units, the specific
terms of the Purchase Contracts and any Capital Securities or debt obligations
of third parties held by a holder securing such holder's obligation to purchase
the Class A Common Stock under the Purchase Contracts, and the terms of the
offering and sale thereof; (vi) in the case of Warrants, the specific
designation, the number, purchase price, exercise price and other terms thereof,
any listing of the Warrants or the underlying Securities on a securities
exchange or any other terms in connection with the offering, sale and exercise
of the Warrants, as well as the terms on which and the Securities for which such
Warrants may be exercised; and (vii) in the case of Capital Securities, the
specific designation, number of securities, liquidation amount per security, the
purchase price, any listing on a securities exchange, distribution rate (or
method of calculation thereof), dates on which distributions shall be payable
and dates from which distributions shall accrue, any voting rights, terms for
any conversion or exchange into other securities, any redemption, exchange or
sinking fund provisions, any rights of the applicable Trust to defer payment of
interest on the Capital Securities and the maximum length of such deferral, any
other rights, preferences, privileges, limitations or restrictions relating to
the Capital Securities, the specific terms and provisions of the applicable
Guarantee and the terms upon which the proceeds of the sale of the Capital
Securities shall be used to purchase a specific series of Junior Subordinated
Debt of the Company.
 
    The offering price to the public of the Securities will be limited to U.S.
$750,000,000 in the aggregate (or its equivalent (based on the applicable
exchange rate at the time of issue), if Securities are offered for consideration
denominated in one or more foreign currencies, currency units or composite
currencies as shall be designated by the Company and indicated in the applicable
Prospectus Supplement). The Debt Securities may be denominated in United States
dollars or, at the option of the Company if so specified in the applicable
Prospectus Supplement, in one or more foreign currencies or currency units. The
Debt Securities may be issued in registered form or bearer form, or both. If so
specified in the applicable Prospectus Supplement, Securities of one or more
classes or series may be issued in whole or in part in the form of one or more
temporary or permanent global securities.
 
    The Class A Common Stock is listed on the New York Stock Exchange (the
"NYSE") under the symbol "AMH."
 
    SEE "RISK FACTORS" BEGINNING ON PAGE 13 FOR CERTAIN CONSIDERATIONS RELEVANT
TO AN INVESTMENT IN ANY OF THE SECURITIES OFFERED HEREBY.
 
    The Securities may be sold to or through underwriters, dealers or agents or
directly to purchasers, to AmerUs Group Co., the Company's parent (the "AmerUs
Group") or through a combination of such methods. See "Plan of Distribution."
The names of any underwriters, dealers or agents involved in the sale of the
Securities in respect of which this Prospectus is being delivered and any
applicable fee, commission or discount arrangements will be set forth in a
Prospectus Supplement. See "Plan of Distribution" for possible indemnification
arrangements for dealers, underwriters and agents.
 
    This Prospectus may not be used to consummate sales of Securities unless
accompanied by a Prospectus Supplement.
 
                               ------------------
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
                 The date of this Prospectus is June 10, 1998.
<PAGE>   22
 
     THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE IOWA
COMMISSIONER OF INSURANCE NOR HAS THE IOWA COMMISSIONER OF INSURANCE RULED UPON
THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS.
                           -------------------------
 
     THE COMPANY IS AN INDIRECT SUBSIDIARY OF AMERICAN MUTUAL HOLDING COMPANY,
AN IOWA MUTUAL INSURANCE HOLDING COMPANY ("AMHC"). IOWA LAW REQUIRES THAT AMHC
AT ALL TIMES OWN DIRECTLY, OR INDIRECTLY THROUGH ONE OR MORE INTERMEDIATE
HOLDING COMPANY SUBSIDIARIES, SHARES OF CAPITAL STOCK OF AMERUS LIFE INSURANCE
COMPANY ("AMERUS LIFE") WHICH CARRY THE RIGHT TO CAST A MAJORITY OF THE VOTES
ENTITLED TO BE CAST BY ALL OF THE OUTSTANDING SHARES OF AMERUS LIFE'S CAPITAL
STOCK. ANY ATTEMPT TO EFFECT ANY TRANSACTION PURSUANT TO WHICH AMHC WOULD NO
LONGER HAVE SUCH VOTING MAJORITY WOULD BE NULL AND VOID AND INEFFECTUAL TO
TRANSFER SUCH VOTING RIGHTS.
                           -------------------------
 
     THE IOWA INSURANCE HOLDING COMPANY SYSTEMS STATUTE APPLICABLE TO THE
COMPANY PROVIDES THAT NO PERSON MAY SEEK TO ACQUIRE CONTROL OF THE COMPANY, AND
THUS INDIRECT CONTROL OF AMERUS LIFE, WITHOUT THE PRIOR APPROVAL OF THE IOWA
COMMISSIONER OF INSURANCE. GENERALLY, ANY PERSON WHO DIRECTLY OR INDIRECTLY
OWNS, CONTROLS, HOLDS WITH POWER TO VOTE OR HOLDS PROXIES REPRESENTING 10% OR
MORE OF THE COMPANY'S VOTING SECURITIES (CONSISTING OF THE COMBINED OUTSTANDING
SHARES OF CLASS A COMMON STOCK AND CLASS B COMMON STOCK) WOULD BE PRESUMED TO
HAVE ACQUIRED SUCH CONTROL, UNLESS SUCH PRESUMPTION IS REBUTTED BY A SHOWING
THAT SUCH CONTROL DOES NOT EXIST IN FACT.
                           -------------------------
 
     FOR NORTH CAROLINA INVESTORS: THE COMMISSIONER OF INSURANCE OF THE STATE OF
NORTH CAROLINA HAS NOT APPROVED OR DISAPPROVED THIS OFFERING NOR HAS SUCH
COMMISSIONER RULED UPON THE ACCURACY OR THE ADEQUACY OF THE PROSPECTUS.
                           -------------------------
 
     THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995 PROVIDES A SAFE HARBOR
FOR FORWARD-LOOKING STATEMENTS. A NUMBER OF MATTERS AND SUBJECT AREAS DISCUSSED
IN THE DOCUMENTS INCORPORATED HEREIN BY REFERENCE AND IN THE SECTIONS OF THIS
PROSPECTUS ENTITLED "REORGANIZATION AND RECENT ACQUISITIONS," "MANAGEMENT'S
DISCUSSION AND ANALYSIS OF RESULTS OF OPERATIONS AND FINANCIAL CONDITION" AND
"BUSINESS" AND ELSEWHERE IN THIS PROSPECTUS AND THE APPLICABLE PROSPECTUS
SUPPLEMENT ARE NOT LIMITED TO HISTORICAL OR CURRENT FACTS AND DEAL WITH
POTENTIAL FUTURE CIRCUMSTANCES AND DEVELOPMENTS. FACTORS THAT MAY CAUSE ACTUAL
RESULTS TO DIFFER MATERIALLY FROM THOSE CONTEMPLATED OR PROJECTED IN SUCH
FORWARD-LOOKING STATEMENTS INCLUDE, AMONG OTHERS, THE FOLLOWING POSSIBILITIES:
(I) HEIGHTENED COMPETITION, INCLUDING THE ENTRY OF NEW COMPETITORS AND THE
DEVELOPMENT OF NEW PRODUCTS BY COMPETITORS; (II) ADVERSE STATE AND FEDERAL
LEGISLATION AND REGULATION, INCLUDING INCREASES IN MINIMUM CAPITAL AND RESERVES,
AND OTHER FINANCIAL VIABILITY REQUIREMENTS AND ADDITIONAL REGULATIONS OF MUTUAL
INSURANCE HOLDING COMPANIES; (III) FAILURE TO MAINTAIN EFFECTIVE DISTRIBUTION
CHANNELS IN ORDER TO OBTAIN NEW CUSTOMERS OR FAILURE TO RETAIN EXISTING
CUSTOMERS; (IV) INABILITY TO CARRY OUT MARKETING AND SALES PLANS, INCLUDING,
AMONG OTHERS, CHANGES TO CERTAIN PRODUCTS AND ACCEPTANCE OF THE REVISED PRODUCTS
IN THE MARKET; (V) LOSS OF
 
                                        2
<PAGE>   23
 
KEY EXECUTIVES; (VI) CHANGES IN INTEREST RATES CAUSING A REDUCTION OF INVESTMENT
INCOME OR A REDUCTION IN DEMAND FOR CERTAIN OF THE COMPANY'S PRODUCTS; (VII)
GENERAL ECONOMIC AND BUSINESS CONDITIONS WHICH ARE LESS FAVORABLE THAN EXPECTED;
(VIII) UNANTICIPATED CHANGES IN INDUSTRY TRENDS; (IX) INACCURACIES IN
ASSUMPTIONS REGARDING FUTURE PERSISTENCY, MORTALITY AND INTEREST RATES USED IN
CALCULATING RESERVE AMOUNTS; (X) ADVERSE CHANGES IN RATINGS ASSIGNED BY RATING
AGENCIES; (XI) CHANGES IN TAX LAWS WHICH NEGATIVELY AFFECT DEMAND FOR THE
COMPANY'S PRODUCTS OR THE APPLICABILITY OF CERTAIN TAXES TO THE COMPANY
(INCLUDING 1998 TAX PROPOSALS OF THE CLINTON ADMINISTRATION RELATING TO
ANNUITIES); (XII) THE RISK FACTORS OR UNCERTAINTIES LISTED HEREIN OR LISTED FROM
TIME TO TIME IN ANY PROSPECTUS SUPPLEMENT OR ANY DOCUMENT INCORPORATED BY
REFERENCE HEREIN; AND (XIII) WITH RESPECT TO COST SAVINGS THAT ARE EXPECTED TO
BE REALIZED FROM, AND COSTS ASSOCIATED WITH, THE RECENT ACQUISITIONS OF DELTA
LIFE CORPORATION ("DELTA") AND AMVESTORS FINANCIAL CORPORATION ("AMVESTORS"),
THE FOLLOWING POSSIBILITIES: (A) THE ESTIMATED COST SAVINGS TO BE REALIZED
THROUGH COMBINING CERTAIN FUNCTIONS OF THE COMPANY, DELTA AND AMVESTORS TO
ELIMINATE REDUNDANCIES AND BETTER SERVE THE COMBINED BUSINESSES' CUSTOMERS, AND
REDUCTIONS IN STAFF CANNOT BE FULLY REALIZED BECAUSE THE CHANGES ARE NOT MADE OR
UNANTICIPATED ADDED COSTS ARE INCURRED; AND (B) COSTS OR DIFFICULTIES RELATED TO
THE INTEGRATION OF THE BUSINESSES OF DELTA AND AMVESTORS WITH THE COMPANY'S
OTHER BUSINESSES ARE GREATER THAN EXPECTED. A VARIETY OF FACTORS COULD CAUSE THE
COMPANY'S ACTUAL RESULTS TO DIFFER MATERIALLY FROM THE EXPECTED RESULTS
EXPRESSED IN THE COMPANY'S FORWARD-LOOKING STATEMENTS, INCLUDING THOSE SET FORTH
IN THE RISK FACTORS AND ELSEWHERE IN THIS PROSPECTUS AND IN THE COMPANY'S OTHER
FILINGS WITH THE COMMISSION.
 
     NO DEALER, SALESMAN OR OTHER INDIVIDUAL HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS, ANY
ACCOMPANYING PROSPECTUS SUPPLEMENT OR THE DOCUMENTS INCORPORATED OR DEEMED
INCORPORATED BY REFERENCE HEREIN. IF GIVEN OR MADE, SUCH INFORMATION OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY
OR ANY UNDERWRITER, DEALER OR AGENT. THIS PROSPECTUS DOES NOT CONSTITUTE AN
OFFER TO SELL, OR A SOLICITATION OF AN OFFER TO BUY, ANY SECURITIES OTHER THAN
THE REGISTERED SECURITIES TO WHICH IT RELATES, OR AN OFFER TO SELL OR A
SOLICITATION OF AN OFFER TO BUY THOSE SECURITIES TO WHICH IT RELATES, IN ANY
JURISDICTION WHERE, OR TO ANY PERSON TO WHOM, IT IS UNLAWFUL TO MAKE SUCH OFFER
OR SOLICITATION. NEITHER THE DELIVERY OF THIS PROSPECTUS OR ANY PROSPECTUS
SUPPLEMENT NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE
ANY IMPLICATION THAT THERE HAS NOT BEEN ANY CHANGE IN THE FACTS SET FORTH IN
THIS PROSPECTUS OR IN THE AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF.
 
                                        3
<PAGE>   24
 
                             AVAILABLE INFORMATION
 
     The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and, in accordance
therewith, files reports, proxy statements and other information with the
Commission. Such reports, proxy statements and other information filed by the
Company with the Commission can be inspected and copied at the public reference
facilities maintained by the Commission at 450 Fifth Street, N.W., Room 1024,
Washington, D.C. 20549, and at the regional offices of the Commission located
at: 7 World Trade Center, 13th Floor, New York, New York 10048; and Citicorp
Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661. Copies of
such material can be obtained from the Public Reference Section of the
Commission at 450 Fifth Street, N.W., Washington, D.C. 20549, upon payment of
the prescribed rates. In addition, the Commission maintains a Web site at
http://www.sec.gov that contains reports, proxy and information statements and
other information regarding registrants, including the Company, that file
electronically with the Commission. The Company's reports are also on file at
the offices of the NYSE, 20 Broad Street, New York, New York 10005.
 
     The Company and the AmerUs Trusts have filed with the Commission a
Registration Statement on Form S-3 under the Securities Act of 1933, as amended
(the "Securities Act"), with respect to the Securities offered hereby. This
Prospectus, which constitutes part of the Registration Statement, does not
contain all of the information set forth in the Registration Statement and the
exhibits thereto, certain parts of which are omitted in accordance with the
rules and regulations of the Commission. Statements contained herein or in any
Prospectus Supplement concerning the provisions of any document do not purport
to be complete and, in each instance, are qualified in all respects by reference
to the copy of such document filed as an exhibit to the Registration Statement
or otherwise filed with the Commission. For further information with respect to
the Company, the AmerUs Trusts and the Securities, reference is hereby made to
such Registration Statement, including the exhibits thereto and the documents
incorporated therein by reference, which can be examined at the Commission's
principal office, 450 Fifth Street, N.W., Washington, D.C. 20549, or copies of
which can be obtained from the Commission at such office upon payment of the
fees prescribed by the Commission.
 
     No separate financial statements of the AmerUs Trusts have been included or
incorporated by reference herein. The Company does not consider such financial
statements material to holders of the Capital Securities because the AmerUs
Trusts are newly formed special purpose entities, have no operating history or
independent operations and are not engaged in, and do not propose to engage in,
any activity other than their holding as trust assets the Junior Subordinated
Debt of the Company and their issuance of the Capital Securities and Common
Securities. See "The Company," "Description of the Capital Securities of the
AmerUs Trusts," "Description of Guarantees," "Description of Debt Securities"
and "Description of Purchase Contracts and Units." The AmerUs Trusts are
statutory business trusts formed under the laws of the State of Delaware. The
Company, as of the date hereof, beneficially owns all of the beneficial
interests in the Trust. The Company's and the AmerUs Trusts' principal executive
offices are located at 699 Walnut Street, Des Moines, Iowa 50309-3948, telephone
number (515) 362-3600.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The following documents previously filed by the Company with the Commission
pursuant to the Exchange Act are incorporated herein by this reference:
 
          1. Annual Report on Form 10-K for the fiscal year ended December 31,
     1997;
 
          2. The description of the Company's Class A Common Stock contained in
     the Registration Statement on Form 8-A filed by the Company with the
     Commission on January 3, 1997, including any amendments or reports filed
     for the purpose of updating such description;
 
          3. The Company's report on Form 8-K filed on October 23, 1997, as
     amended by Form 8-K/A filed January 6, 1998 reporting the acquisition of
     Delta and certain related financial statements; and
 
          4. The Company's report on Form 8-K filed on December 19, 1997, as
     amended by Form 8-K/A filed on March 3, 1998 reporting the acquisition of
     AmVestors and certain related financial statements;
 
          5. Proxy Statement on Schedule 14A filed by the Company with the
     Commission, dated April 13, 1998;
 
                                        4
<PAGE>   25
 
          6. Quarterly Report on Form 10-Q for the fiscal quarter ended March
     31, 1998; and
 
          7. Report on Form 10-K/A for the fiscal year ended December 31, 1997
     filed with the Commission on June 4, 1998.
 
     All documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act subsequent to the date hereof and prior to the
termination of the offering made hereby shall be deemed to be incorporated by
reference in this Prospectus or any Prospectus Supplement and to be part hereof
from the date of filing of such documents.
 
     Any statement contained herein, or in a document all or a portion of which
is incorporated or deemed to be incorporated by reference herein, shall be
deemed to be modified or superseded for purposes of this Prospectus to the
extent that a statement contained herein or in any other subsequently filed
document which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or
superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this Prospectus or any Prospectus Supplement. To the extent
that any proxy statement is incorporated by reference herein, such incorporation
shall not include any information contained in such proxy statement that is not,
pursuant to the Commission's rules, deemed to be "filed" with the Commission or
subject to the liabilities of Section 18 of the Exchange Act.
 
     The Company will provide without charge to each person to whom this
Prospectus is delivered, upon the written or oral request of such person, a copy
of any or all of the documents incorporated herein by reference (other than
exhibits to such documents unless such exhibits are specifically incorporated by
reference into such documents). Any such request should be directed to James A.
Smallenberger, Senior Vice President and Secretary, AmerUs Life Holdings, Inc.,
699 Walnut Street, Des Moines, Iowa 50309-3948 (telephone number (515)
362-3600).
 
                                        5
<PAGE>   26
 
                                  THE COMPANY
 
GENERAL
 
     The Company is an insurance holding company engaged through its
subsidiaries in the business of marketing, underwriting and distributing a broad
range of individual life insurance and annuity products to individuals and
businesses in 49 states, the District of Columbia and the U.S. Virgin Islands.
The Company's primary product offerings consist of whole life, universal life
and term life insurance policies and fixed annuities. In addition, through a
joint venture (the "Ameritas Joint Venture") with Ameritas Life Insurance Corp.
("Ameritas"), the Company's subsidiary, AmerUs Life Insurance Company ("AmerUs
Life"), markets fixed annuities issued by Ameritas Variable Life Insurance
Company ("AVLIC") and sells AVLIC's variable life insurance and variable annuity
products. As of December 31, 1997, the Company had approximately 573,000 life
insurance policies and annuity contracts outstanding and individual life
insurance in force, net of reinsurance, of approximately $26.7 billion with life
insurance reserves of $2.4 billion and annuity reserves of $6.1 billion. As of
December 31, 1997, the Company had total assets of $10.3 billion and total
shareholders' equity of $928.0 million.
 
     The Company was formed in 1996 as a result of the creation of American
Mutual Holding Company ("AMHC") the first mutual insurance holding company in
the United States. AMHC owns 100% of AmerUs Group Co. ("AmerUs Group"), the
Company's controlling shareholder. The Company's principal subsidiaries are
AmerUs Life, Delta Life Corporation ("Delta") and AmVestors Financial
Corporation ("AmVestors"). AmerUs Life was originally incorporated in 1896 as a
mutual life insurance company.
 
     AmerUs Life's target customers are individuals in the middle and upper
income brackets and small businesses. Its geographic focus is national in scope
(except for Connecticut, Maine, New Hampshire, New York and Vermont, in which
AmerUs Life is not licensed to do business), and it primarily serves suburban
and rural areas. Efforts are currently underway to expand AmerUs Life's
territory into the states of Connecticut, Maine, New Hampshire and Vermont.
AmerUs Life distributes its products primarily through a combination of career
general agency and personal producing general agency ("PPGA") distribution
systems, as well as a network of independent brokers. The career general agency
system consists of a network of 35 career general agencies, with approximately
570 career agents. The PPGA system is comprised of approximately 425 PPGA's, who
have approximately 1,100 agents. As of December 31, 1997, AmerUs Life had
approximately 408,000 life insurance policies and annuity contracts outstanding
and individual life insurance in force, net of reinsurance, of approximately
$26.6 billion. Variable life insurance products and the fixed and variable
annuities offered by the Ameritas Joint Venture are marketed through AmerUs
Life's distribution systems and the distribution systems of Ameritas and AVLIC,
which consist of approximately 160 agents and 540 independent broker-dealers
(with approximately 9,000 registered representatives), respectively.
 
     The Company made two major acquisitions in 1997. The Company acquired Delta
on October 23 for approximately $165 million in cash (the "Delta Acquisition")
and AmVestors on December 19 in a stock exchange valued at approximately $350
million (the "AmVestors Acquisition"). These acquisitions, along with the growth
of AmerUs Life, increased the Company's assets from $4.4 billion at December 31,
1996 to $10.3 billion at December 31, 1997.
 
     The principal asset of Delta is its wholly-owned subsidiary, Delta Life and
Annuity Company ("Delta Life"), an Iowa domiciled life insurance company. Delta
Life is licensed in the District of Columbia and in all states except New York,
and specializes in the sale of individual single and flexible premium deferred
annuities, primarily in the southeastern, western, southwestern and midwestern
regions of the United States. Sales are made primarily through a network of over
3,300 independent agents. Delta Life's strategy is to structure its fixed
annuity products to appeal to the conservative retirement saver who is seeking
principal preservation and consistency of earnings. Most of Delta Life's
products are innovative in that they incorporate a fixed contractual management
fee. Approximately 58% of Delta's 1997 direct collected premiums were derived
from retirement-oriented tax-qualified annuities. As of December 31, 1997, Delta
Life had approximately 52,000 annuity contracts outstanding.
 
                                        6
<PAGE>   27
 
     AmVestors' principal operating subsidiaries are American Investors Life
Insurance Company, Inc. ("American"), a Kansas domiciled life insurance company
licensed in 48 states and the District of Columbia, and Financial Benefit Life
Insurance Company ("FBL"), a Kansas domiciled life insurance company doing
business in 40 states, the District of Columbia and the U.S. Virgin Islands.
AmVestors specializes in the sale of annuity products, further strengthening the
Company's presence in the rapidly growing asset accumulation and retirement and
savings markets. AmVestors utilizes product features intended to enhance the
potential for profit by encouraging persistency and reducing premature
withdrawal during the first five to fourteen years of an annuity contract.
AmVestors distributes its products through a national network of approximately
7,800 licensed independent agents recruited through its wholly-owned
subsidiaries as well as through almost 60 independent marketing organizations.
As of December 31, 1997, AmVestors had approximately 104,000 annuity contracts
outstanding.
 
     The Company's principal executive offices are located at 699 Walnut Street,
Des Moines, Iowa 50309-3948; telephone (515) 362-3600.
 
BUSINESS STRATEGY
 
     The business strategy of the Company is to focus on providing individual
retail consumers in the United States with superior financial services and
products that will meet their financial planning, risk protection, and asset
accumulation needs. Target markets of the Company include individuals in the
middle and upper income brackets and small businesses. Its geographic focus is
national in scope (except for New York, in which the Company is not licensed to
do business), and it primarily serves suburban and rural areas.
 
     The Company seeks to effect this strategy by focusing on life insurance and
asset accumulation products distributed through a variety of distribution
systems. In particular, the Company has developed a very strong position in the
distribution of fixed annuities through independent agents and has a long
established reputation as a provider of whole life insurance products,
distributed through career and PPGA agency distribution systems, that are among
the most attractively priced products to consumers in the industry.
 
     The Company's strategy emphasizes effective management of certain operating
fundamentals -- mortality, expenses, persistency and investment results -- where
the Company's results have historically compared favorably to the industry. The
Company's operating strengths have enabled it to provide attractively priced
products to consumers while also generating profitability for its shareholders.
 
     Growth through a combination of internal growth, mergers and acquisitions
and strategic alliances is a key element of the Company's strategy. In the life
insurance market, the Company presently has less than one half of one percent of
new life insurance sales nationwide, which provides substantial opportunity for
increased growth through improved marketing and sales execution even in a
generally flat business environment.
 
     In the fixed annuity area, the Company is presently a leader in the
distribution of fixed annuities through independent agents. Independent agents
have increased their share of fixed annuity sales in recent years and the
Company's goal is to consistently rank among the top 3 to 5 providers in this
segment.
 
     The Company continues to seek to both deepen and diversify its distribution
channels. Primarily as a result of the acquisitions of AmVestors and Delta, the
Company's distribution channels have grown significantly in recent years. As of
December 31, 1997, the Company had over 15,000 distributors as compared to
approximately 3,700 distributors as of December 31, 1996. While continuing to
expand its existing channels, the Company is in the process of developing
additional bank and major independent marketing organization distribution
channels.
 
CONTROLLING SHAREHOLDER
 
     AMHC is the indirect controlling shareholder of the Company through its
ownership of AmerUs Group. As of March 31, 1998 AmerUs Group owned all 5,000,000
of the outstanding shares of Class B Common Stock and 12,380,300 of the
outstanding shares of Class A Common Stock, representing approximately 50.04% of
the combined voting power of the Class A Common Stock and Class B Common Stock.
AMHC acquired its ownership interest in the Company as a result of the
reorganization, pursuant to which American
                                        7
<PAGE>   28
 
Mutual Life formed AMHC as a mutual insurance holding company and American
Mutual Life was converted into a stock life insurance company as a wholly owned
subsidiary of AMHC (the "Reorganization"). See "Reorganization and Recent
Acquisitions -- Background and Description of the Reorganization."
 
                               THE AMERUS TRUSTS
 
     Each AmerUs Trust is a statutory business trust formed under Delaware law
pursuant to (i) a separate declaration of trust (each a "Trust Agreement")
executed by the Company, as sponsor (the "Sponsor"), and certain trustees of
such trust (the "Issuer Trustees") and (ii) the filing of a certificate of trust
with the Secretary of State of the State of Delaware. Each such declaration of
trust will be amended and restated in its entirety (as so amended and restated,
the "Declaration") substantially in the form filed as an exhibit to the
Registration Statement of which this Prospectus forms a part, as of the date the
Capital Securities of such AmerUs Trust are initially issued. Each Declaration
will be qualified as an indenture under the Trust Indenture Act of 1939, as
amended (the "Trust Indenture Act"). Each AmerUs Trust exists for the exclusive
purposes of (i) issuing and selling the Capital Securities and the Common
Securities representing undivided beneficial interests in the assets of such
AmerUs Trust, (ii) investing the proceeds of the sale of the Capital Securities
and the Common Securities in certain Junior Subordinated Debt (as defined
herein), and (iii) engaging in only those other activities necessary or
incidental thereto.
 
     All of the Common Securities of each AmerUs Trust will be owned directly or
indirectly by the Company. The Common Securities will rank pari passu in right
of payment, and payments will be made thereon pro rata, with the Capital
Securities, except that upon the occurrence and continuance of an Event of
Default under the Declarations (as defined therein) resulting from an Event of
Default (as defined in the Indenture (as defined herein)), the rights of the
Company as holder of the Common Securities to payment in respect of
distributions and payments upon liquidation, redemption or otherwise will be
subordinated to the rights of the holders of the Capital Securities. See
"Description of the Capital Securities of the AmerUs Trusts." The Company will
acquire Common Securities in an aggregate liquidation amount equal to
approximately 3% of the total capital of each AmerUs Trust.
 
     Unless otherwise specified in the applicable Prospectus Supplement, each
AmerUs Trust has a term of approximately 55 years, but may terminate earlier as
provided in its Declaration. The Trust's business and affairs will be conducted
by the Issuer Trustees and Administrators appointed by the Company as the holder
of the Common Securities of each AmerUs Trust. The Issuer Trustees will be First
Union National Bank ("First Union Bank") and First Union Trust Company, National
Association ("First Union Trust"), First Union Bank, as the Property Trustee
(the "Property Trustee"), and First Union Trust, as the Delaware Trustee (the
"Delaware Trustee"), and the Administrators will be three individuals who are
employees of the Company (the "Administrators"). First Union Bank, as the
Property Trustee, will act as sole indenture trustee under the Declaration for
purposes of compliance with the provisions of the Trust Indenture Act. First
Union Bank will also act as indenture trustee (the "Guarantee Trustee") under
the Guarantee and the Indenture, until removed or replaced by the holder of the
Common Securities of each AmerUs Trust. See "Description of Guarantees." The
Company, as the direct or indirect holder of the Common Securities of each
AmerUs Trust, or if an event of default under the Declaration has occurred and
is continuing, the holders of a majority in liquidation amount of the Capital
Securities of each AmerUs Trust, will be entitled to appoint, remove or replace
the Property Trustee and/or the Delaware Trustee. In no event will the holders
of the Capital Securities (or Units) have the right to vote to appoint, remove
or replace the Administrators; such voting rights will be vested exclusively in
the Company, as the direct or indirect holder of the Common Securities of each
AmerUs Trust. The duties and obligations of each Issuer Trustee and
Administrator is governed by such Declaration. Under the Declaration, all
parties to the Declaration will agree, and the holders of the Units upon
purchase of their Units will be deemed to have agreed, for United States Federal
income tax purposes, to treat the Trust as a grantor trust, the Junior
Subordinated Debt as indebtedness and the Capital Securities of each AmerUs
Trust as evidence of indirect beneficial ownership in the Junior Subordinated
Debt. See "Description of the Guarantees" and "Description of the Capital
Securities of the AmerUs Trusts."
 
                                        8
<PAGE>   29
 
     The Property Trustee will hold title to the Junior Subordinated Debt for
the benefit of the holders of the Capital Securities of each AmerUs Trust and
the Property Trustee will have the power to exercise all rights, powers and
privileges under the Indenture as the holder of the Junior Subordinated Debt. In
addition, the Property Trustee will maintain exclusive control of a segregated
non-interest bearing bank account (the "Property Account") to hold all payments
made in respect of the Junior Subordinated Debt for the benefit of the holders
of the Capital Securities of each AmerUs Trust. The Property Trustee will make
payments of distributions and payments on liquidation, redemption and otherwise
to the holders of the Capital Securities of each AmerUs Trust out of funds from
the Property Account. The Guarantee Trustee will hold the Guarantee for the
benefit of the holders of the Capital Securities. See "Description of the
Purchase Contracts and the Units."
 
     The rights of the holders of the Capital Securities, including economic
rights, rights to information and voting rights, are set forth in the
Declaration, the Delaware Business Trust Act and the Trust Indenture Act. See
"Description of the Capital Securities of the AmerUs Trusts." The Company will
pay all fees and expenses related to the AmerUs Trust and the offering of the
Capital Securities and Units and will pay, directly or indirectly, all ongoing
costs, expenses and liabilities of the AmerUs Trusts.
 
     The principal executive office of each AmerUs Trust is located at 699
Walnut Street, Des Moines, Iowa 50309-3948; telephone (515) 362-3600.
 
                                        9
<PAGE>   30
 
                            ORGANIZATIONAL STRUCTURE
 
     The following chart illustrates as of April 15, 1998 the general
organization of AMHC and its subsidiaries, including the Company:
 
                             ORGANIZATIONAL CHART
 
                                       10
<PAGE>   31
 
                        SELECTED CONSOLIDATED FINANCIAL
                               AND OPERATING DATA
 
     The following table sets forth certain financial and operating data of the
Company. The selected consolidated financial data below for each of the five
years ending December 31, 1997 are derived from the Consolidated Financial
Statements of the Company, which financial statements have been audited by KPMG
Peat Marwick LLP, independent auditors. During 1997, the Company acquired Delta
and AmVestors in transactions that were accounted for using the purchase method
of accounting. As a result, the Consolidated Income Statement Data includes the
results of Delta and AmVestors from their respective acquisition dates and the
Consolidated Balance Sheet Data includes year-end data for Delta and AmVestors.
 
<TABLE>
<CAPTION>
                                                                     AS OF OR FOR THE YEAR ENDED
                                                                             DECEMBER 31,
                                                      ----------------------------------------------------------
                                                      1997(A)(B)    1996(B)      1995       1994(C)     1993(C)
                                                      ----------    -------      ----       -------     -------
                                                             (DOLLARS IN MILLIONS, EXCEPT PER SHARE DATA)
<S>                                                   <C>          <C>         <C>         <C>         <C>
CONSOLIDATED INCOME STATEMENT DATA:
Revenues:
  Insurance premiums................................  $    48.1    $   138.5   $   244.1   $   237.9   $   226.4
  Product charges...................................       43.4         49.3        57.3        56.3        57.4
  Net investment income.............................      224.4        228.7       285.2       275.7       269.9
  Realized gains (losses) on investments............       13.8         66.0        51.4       (19.9)       15.5
  Contribution from the Closed Block................       31.1         19.9          --          --          --
                                                      ---------    ---------   ---------   ---------   ---------
Total revenues......................................      360.8        502.4       638.0       550.0       569.2
                                                      ---------    ---------   ---------   ---------   ---------
Benefits and expenses:
  Total policyowner benefits........................      193.2        261.9       374.6       369.9       364.3
  Total expenses....................................       72.6         95.1       101.1       103.5        96.6
  Dividends to policyowners.........................        1.6         26.3        49.4        45.0        45.5
                                                      ---------    ---------   ---------   ---------   ---------
Total benefits and expenses.........................      267.4        383.3       525.1       518.4       506.4
                                                      ---------    ---------   ---------   ---------   ---------
Income from operations..............................       93.4        119.1       112.9        31.6        62.8
Interest expense....................................       15.0          2.1         2.4         5.5         7.0
                                                      ---------    ---------   ---------   ---------   ---------
Income before income tax expense and equity in
  earnings of unconsolidated subsidiary.............       78.4        117.0       110.5        26.1        55.8
Income tax expense..................................       22.0         43.8        41.2        19.4        21.4
                                                      ---------    ---------   ---------   ---------   ---------
Income before equity in earnings of unconsolidated
  subsidiary........................................       56.4         73.2        69.3         6.7        34.4
Equity in earnings of unconsolidated subsidiary.....        1.7          1.0
Cumulative effect of a change in accounting
  principle, net of tax.............................         --           --          --          --        (3.2)
                                                      ---------    ---------   ---------   ---------   ---------
Net income..........................................  $    58.1    $    74.2   $    69.3   $     6.7   $    31.2
                                                      =========    =========   =========   =========   =========
Earnings per common share
  Basic(D)..........................................  $    2.47    $    3.20   $    2.99   $      --   $      --
  Diluted(E)........................................       2.46         3.20        2.99          --          --
Dividends declared per common share.................       0.30           --          --          --          --
Ratios of earnings to fixed charges(F)(G):..........       2.07         2.73        2.37        1.31        1.62
CONSOLIDATED BALANCE SHEET DATA:
Total invested assets...............................  $ 7,695.5    $ 2,880.8   $ 3,965.0   $ 3,491.7   $ 3,639.3
Total assets........................................   10,254.0      4,384.2     4,371.9     4,036.9     4,030.7
Total liabilities...................................    9,240.0      3,926.7     3,832.0     3,618.6     3,524.8
Company-obligated mandatorily redeemable preferred
  securities........................................       86.0           --          --          --          --
Total stockholders' equity(H).......................      928.0        457.5       539.9       418.3       505.9
OTHER OPERATING DATA:
Adjusted operating income(I)........................  $    49.1    $    37.6   $    38.5   $    27.5   $    24.2
Adjusted operating income per common share (basic
  and diluted)......................................       2.08         1.62        1.66          --          --
Individual life insurance in force, net of
  reinsurance.......................................     26,703       25,725      25,157      25,282      24,698
Annuity account balances(J).........................      6,134        1,363       1,467       1,473       1,410
Number of employees.................................        692          412         406         457         489
STATUTORY DATA:
Premiums and deposits:
  Individual life...................................  $   319.1    $   312.7   $   307.1   $   296.4   $   286.3
  Annuities(J)......................................       75.5         81.4       197.1       187.8        90.4
</TABLE>
 
- - -------------------------
(A) Consolidated Income Statement Data includes the results for Delta subsequent
    to October 23, 1997 and the results for AmVestors subsequent to December 19,
    1997, and Consolidated Balance Sheet Data includes year-end data for Delta
    and AmVestors.
 
                                       11
<PAGE>   32
 
(B) The Company formed the Closed Block on June 30, 1996 as a part of the
    Reorganization. Invested assets allocated to the Closed Block are classified
    as Closed Block assets. Revenues and expenses associated with the Closed
    Block are shown net as a single line item. Accordingly, the individual
    income statement components for 1997 are not fully comparable with those of
    1996 and 1995, due to the establishment of the Closed Block on June 30,
    1996. See "Management's Discussion and Analysis of Results of Operations and
    Financial Condition -- Combined Results of Operations."
 
(C) The merger of the two predecessor entities of the Company, which was
    consummated in 1994, has been accounted for as a pooling of interests
    transaction.
 
(D) Retroactively reflects the pro-forma effect of the issuance of 18.16 million
    shares of the Company's Class A Common Stock and 5.0 million shares of
    AmerUs Class B Common Stock at the beginning of 1995. The 1997 calculation
    reflects 18.54 million weighted average shares of Class A Common Stock and 5
    million shares of Class B Common Stock outstanding, respectively.
 
(E) Diluted earnings per common share for 1997 is calculated using 18.57 million
    weighted average shares of Class A Common Stock and 5 million shares of
    Class B Common Stock outstanding.
 
(F) For purposes of computing the ratio of earnings to fixed charges, "earnings"
    consist of income from operations before federal income taxes, fixed charges
    and pre-tax earnings required to cover preferred stock dividend
    requirements. "Fixed charges" consist of interest expense on debt and
    capital securities, amortization of debt expense and interest credited on
    deferred annuities.
 
(G) Since the Company currently has no preferred stock outstanding, the ratio of
    earnings to fixed charges and preferred stock dividends is the same as the
    ratio of earnings to fixed charges.
 
(H) Amounts shown include the effects of reporting fixed maturity securities at
    fair value and recording the unrealized appreciation or depreciation on such
    securities as a component of stockholders' equity, net of tax and other
    adjustments. Such adjustments are in accordance with Statement of Financial
    Accounting Standards 115, "Accounting for Certain Investments in Debt and
    Equity Securities," which the Company adopted December 31, 1993. Amounts
    reported prior to December 31, 1996 reflect policyowners' equity. In
    addition, 1996 stockholder's equity was reduced by a capital contribution
    from the Company to AmerUs Group in the amount of $79 million. Amounts
    reported for the year ended December 31, 1997 include the Delta and
    AmVestors Acquisitions.
 
(I) Adjusted operating income reflects net income adjusted to eliminate certain
    items (net of applicable income taxes) which management believes are not
    necessarily indicative of overall operating trends, including net realized
    gains or losses on investments. Different items are likely to occur in each
    period presented and others may have different opinions as to which items
    may warrant adjustment. The adjusted operating income shown does not
    constitute net income computed in accordance with GAAP. See "Management's
    Discussion and Analysis of Results of Operations and Financial Condition --
    Adjusted Operating Income."
 
(J) Effective May 1996, substantially all individual deferred annuity sales by
    AmerUs Life distribution systems are made through the Ameritas Joint
    Venture. See "Reorganization and Recent Acquisitions -- Ameritas Joint
    Venture."
 
                                       12
<PAGE>   33
 
                                  RISK FACTORS
 
COMPETITIVE ENVIRONMENT
 
     The Company competes with a large number of other insurers and
non-insurance financial service companies, such as banks, broker-dealers and
mutual funds. Many competitors have greater financial resources and offer
alternative products. Other insurers have higher claims-paying ability and
financial strength ratings than the Company. Competition exists for individual
consumers and agents and other distributors of life insurance and annuity
products. Banks, with their pre-existing customer base for financial services
products, may pose increasing competition in the future to life insurers.
 
     Congress is considering changing the laws which regulate banks, insurance
companies and other financial institutions. These changes may permit banks to
own insurance companies and vice versa. None of these proposals has yet been
enacted. It is not possible to predict whether any of these proposals will be
enacted or, if enacted, their potential effect on the Company.
 
     The Company must attract and retain productive agents to sell its life
insurance and annuity products. Strong competition exists among insurance
companies for agents with demonstrated ability. Competition among insurance
companies for such agents is based on the services provided to, and
relationships developed with, these agents in addition to compensation and
product structure.
 
IMPORTANCE OF RATINGS
 
     Ratings with respect to claims-paying ability and financial strength have
become an increasingly important factor in establishing the competitive position
of insurance companies. Each of the rating agencies reviews its ratings
periodically and there can be no assurance that current ratings will be
maintained in the future. Claims-paying and financial strength ratings are based
upon factors relevant to policyowners and are not directed toward protection of
investors in the Company's or an AmerUs Trust's securities.
 
     Future downgrades in the ratings of the Company's life insurance
subsidiaries could significantly affect sales of life insurance and annuity
products and could have a material adverse affect on the results of operations
of the Company. See "Management's Discussion and Analysis of Results of
Operations and Financial Condition."
 
ADVERSE TAX LEGISLATION AND ADMINISTRATIVE PRONOUNCEMENTS
 
     Congress has from time to time considered legislation that would reduce or
eliminate the benefits to policyowners of the deferral of taxation on the
appreciation in value of certain annuities and life insurance products. In 1998,
President Clinton made a budget proposal concerning the taxation of certain
exchanges between annuities, including the reallocation of assets within a
variable annuity. Other proposals affect the taxation of annuities and life
insurance products and insurance companies. A federal tax law enacted in 1997
reduced the rate of taxation on certain long-term capital gains for individuals.
This legislation, along with other possible proposals or administrative
pronouncements, including those relating to the dividends received deduction,
the applicability of the equity add-on tax, and ordinary versus capital gain
treatment for corporations, could adversely affect the taxation of the Company
or the sale of annuities and life insurance products. Similarly, there can be no
certainty as to what, if any, future laws or administrative pronouncements on
these issues might be enacted or promulgated or whether any such laws or
pronouncements would have any adverse effects on the Company.
 
INTEREST RATE FLUCTUATIONS; RISK OF IMPACT OF FORCED LIQUIDATION OF INVESTMENT
PORTFOLIO
 
     Severe interest rate fluctuations could adversely affect the ability of the
Company's life insurance subsidiaries to pay policyowner benefits with operating
and investment cash flows, cash on hand and other cash sources. See
"Management's Discussion and Analysis of Results of Operations and Financial
Condition."
 
     Interest rate fluctuations may also have an impact on policyowner behavior.
If the Company does not maintain competitive interest rates with those credited
in the marketplace, increased policy terminations may
                                       13
<PAGE>   34
 
be experienced. A reduction in interest rates could depress the market for the
Company's fixed annuity products. While policyowners may pay surrender charges
to terminate policies, such terminations would reduce the Company's future
income.
 
     The Company's actual cash flows from investments may differ from those
anticipated at the time of investment. Some of the Company's corporate bond
investments have provisions which could cause the Company to reinvest the
proceeds received at maturity of such investments at lower interest rates if
such bond investments were prepaid prior to their stated maturities. The
Company's collateralized mortgage obligations and other asset-backed securities
are purchased based on assumptions regarding rates of prepayments. If actual
prepayments are earlier or later than anticipated at the time of purchase, the
Company may not receive cash flows when expected or needed. These prepayments
are expected to be influenced by interest rates available for new mortgages as
well as general economic conditions.
 
     Most of the Company's insurance and annuity products provide for guaranteed
minimum yields. Accordingly, a significant drop in market rates of interest
could have a material impact on the Company's future results of operations.
 
HOLDING COMPANY STRUCTURE; LIMITATIONS ON DIVIDENDS
 
     The Company is an insurance holding company whose assets consist primarily
of all of the outstanding stock of AmerUs Life, Delta and AmVestors. The
Company's ongoing ability to pay dividends to its shareholders and meet its
other obligations, including its obligations in respect of the Securities on
which it is an obligor, depends primarily upon receipt of sufficient funds from
its subsidiaries in the form of dividends or interest payments.
 
     The payment of dividends to the Company by its insurance subsidiaries is
regulated under state insurance laws. Under Iowa law, AmerUs Life and Delta Life
may pay dividends only from the earned surplus arising from their respective
businesses. Each must receive the prior approval of the Iowa Commissioner to pay
a dividend if such dividend would exceed certain statutory limitations. Based on
these limitations and 1997 results, AmerUs Life could pay approximately $58
million in dividends in 1998 and Delta Life could pay approximately $8 million
in dividends in 1998 without obtaining the Iowa Commissioner's approval. The
payment of dividends by AmVestors' insurance subsidiaries is regulated under
Kansas law. Kansas has statutory limitations similar to those of Iowa. Based
upon these limitations and 1997 results, AmVestors' insurance subsidiaries could
pay approximately $15 million in dividends in 1998 without obtaining prior
regulatory approval. In February 1998 AmerUs Life paid the Company $5 million in
dividends. Based upon the cumulative limitations and 1997 results, the Company's
insurance subsidiaries could pay an additional $75 million in dividends in 1998
without obtaining regulatory approval. If AmerUs Life, Delta or AmVestors cannot
pay dividends or interest to the Company in the future, it could have a material
adverse effect on the Company and the market value of the Securities. See
"Management's Discussion and Analysis of Results of Operations and Financial
Condition -- Liquidity and Capital Resources."
 
     Under the terms of its existing credit agreement with its banks, the
Company is prohibited from paying cash dividends on the Company's capital stock
in excess of an amount equal to 3% of the Company's consolidated net worth as of
the last day of the preceding fiscal year. Accordingly, the Company would be
permitted by its existing credit agreement to pay a cash dividend up to
approximately $28 million in 1998. The Company has also pledged to the banks
which are party to the Credit Agreement (as defined herein) approximately 49.9%
of the outstanding common stock of AmerUs Life owned by the Company, 100% of the
outstanding common stock of Delta and a $50 million 9% note payable to the
Company by AmerUs Life.
 
     In connection with the 8.85% Capital Securities, Series A (the "Series A
Capital Securities"), issued in February, 1997 by AmerUs Capital I, the
Company's subsidiary trust, the Company has agreed not to declare or pay any
dividends on the Company's capital stock, including the Class A Common Stock,
during any period of time in which dividends on such Capital Securities are
suspended, except for stock dividends. Other
 
                                       14
<PAGE>   35
 
dividends in respect of the Company's capital stock cannot be paid until all
accrued dividends on the Series A Capital Securities have been paid.
 
CONTROL BY AMHC; ANTI-TAKEOVER EFFECTS OF IOWA LAW AND THE COMPANY'S ARTICLES OF
INCORPORATION AND BY-LAWS
 
     Under Iowa law and the Company's Amended and Restated Articles of
Incorporation (the "Articles of Incorporation"), AMHC, as a mutual insurance
holding company, is required to own, directly or indirectly, shares of capital
stock of AmerUs Life which carry the right to cast a majority of the votes
entitled to be cast by all of the outstanding shares of AmerUs Life's capital
stock. Consequently, AMHC may, without the approval of the other shareholders of
the Company, elect all of the directors of the Company and approve matters
submitted for shareholder approval. In addition, unless AMHC is demutualized, an
action beyond the Company's control, the Company cannot be the subject of a
successful takeover bid. Certain provisions in the Company's Articles of
Incorporation and By-laws may delay, defer or prevent a takeover attempt that a
shareholder might consider in his or her best interests. These provisions
include supermajority voting rights for the Company's Class B common stock no
par value (the "Class B Common Stock"), the ability of the board of directors to
issue so-called "blank check" preferred stock and a classified board of
directors. Such provisions may adversely affect the prevailing market price of
the Class A Common Stock. See "Description of Capital Stock -- Certain
Provisions of the Articles of Incorporation and the By-laws of the Company."
 
RELATIONSHIP WITH AMHC; POTENTIAL CONFLICTS OF INTEREST
 
     AMHC is a mutual insurance holding company which is operated for the
benefit of its members. The members of AMHC are policyowners of AmerUs Life.
AMHC (or certain of its wholly-owned subsidiaries) have entered into agreements
with the Company and/or AmerUs Life in which the Company and/or AmerUs Life will
provide to such subsidiaries or affiliates certain management, data processing,
legal and other services, or such subsidiaries or affiliates will provide
services to the Company and/or AmerUs Life. The Company's management believes
the terms of such agreements are fair and reasonable. However, none of these
contracts were the result of arms' length negotiations between independent
parties. These agreements may be modified in the future. Additional agreements
or transactions may be entered into between AMHC or subsidiaries of AMHC and the
Company and its subsidiaries.
 
     As a result of these arrangements, there may be a number of potential
conflicts of interest between the Company and AMHC. In an effort to address such
potential conflicts, regulations of the Iowa Commissioner require the Company to
have three outside directors who are not directors of AMHC. Currently, the
Company has four outside directors who are not directors of AMHC or any of
AMHC's subsidiaries. These outside directors comprise the Company's Intercompany
Transactions Committee which reviews intercompany transactions involving
potential conflicting interests. However, there can be no assurance that
decisions made by AMHC will not adversely affect the Company.
 
     The National Association of Insurance Commissioners has formed a working
group to review mutual insurance holding company legislation and regulations.
The working group's review could address, among other things, potential
restrictions on stock ownership by directors and officers, the utilization of
non-voting or low voting stock, standards for affiliate transactions, and
regulation of potential conflicts of interests. It is unclear what effect, if
any, this review would have, but it is possible that insurance regulators,
including Iowa, could propose additional laws or regulations which would affect
or inhibit transactions between affiliates, future stock issuances, the ability
of officers and directors to secure significant ownership positions in the
Company or otherwise restrict the ability of the Company to take advantage of
new business opportunities.
 
RESTRICTIONS ON RATIO OF THE COMPANY'S STOCK CLASSES
 
     The Company's Articles of Incorporation provide that the number of
outstanding shares of Class A Common Stock (excluding shares of Common Stock
owned by AMHC or another Permitted Class B Holder (as defined herein)) shall
exceed the number of outstanding shares of the Company's Class B common stock
plus the shares of Class A Common Stock beneficially owned by AMHC or another
Permitted Class B Holder
 
                                       15
<PAGE>   36
 
only as authorized by law and not by a ratio of more than three to one. As a
result, the Company's ability to issue additional shares of Class A Common Stock
for any reason, including raising additional equity capital, for stock options
or in connection with acquisitions may be restricted if such condition should
occur. As of March 1, 1998, the ratio was approximately 1:1.
 
UNCERTAINTIES IN INTEGRATING OPERATIONS AND ACHIEVING COST SAVINGS
 
     As a result of the acquisitions of Delta and AmVestors, the Company has
substantially increased in size. While the Company has integrated the investment
operations of both AmVestors and Delta with those of AmerUs Life, there can be
no assurance as to the cost savings and efficiencies that will be achieved. The
success of the acquisition of Delta depends in part on the ability of the
Company to combine operations, integrate departments, systems and procedures and
obtain cost savings from these acquisitions. While the operations of Delta have
been integrated with those of AmerUs Life, and certain integration steps have
been taken with respect to AmVestors, there can be no assurance as to the cost
savings and efficiencies that will be achieved. See "Business -- Integration of
Recently Acquired Subsidiaries."
 
FUTURE POLICY BENEFITS EXPOSURE
 
     The liability established by the Company for future life insurance and
annuity policy benefits is based upon assumptions concerning a number of
factors. Such factors include interest rates, mortality, duration of the
policies and expenses. Actual experience will likely differ from assumed
experience. If the Company's provision for future policy benefits proves
inadequate, future earnings will be adversely affected.
 
REGULATORY AND RELATED RISKS
 
     The Company's life insurance subsidiaries are subject to regulation by
state regulators under the insurance laws of states in which they conduct
business. The Company, AmerUs Group, AMHC, AmerUs Life and Delta Life are
regulated by the Iowa Insurance Division. Both the Iowa and Kansas Departments
regulate transactions with affiliates. In addition, AmVestors and its
subsidiaries are regulated by the Kansas Department of Insurance. The purpose of
such regulation is primarily to provide safeguards for policyowners rather than
to protect the interests of shareholders. The insurance laws of the various
states establish regulatory agencies with broad administrative powers including
the authority to grant or revoke operating licenses and to regulate sales
practices, investments, deposits of securities, the form and content of
financial statements and insurance policies, accounting practices and the
maintenance of specified reserves and capital. In addition, the Iowa
Commissioner of Insurance has adopted rules regulating the issuance of stock by
the Company in equity offerings and the issuance of convertible securities.
 
     Insurance regulators have in recent years investigated allegations of
improper sales practices by insurance agents, including churning and misleading
sales presentations. The National Association of Insurance Commissioners has
adopted a model law and regulation which would standardize the form and content
of any illustrations provided to prospective purchasers of individual life
insurance products. The model law has been enacted in a number of states. The
Company expects that similar laws will eventually be enacted in additional
states in which its subsidiaries sell individual life insurance products. There
can be no assurance as to whether any such changes will have a material adverse
impact on sales of such products by the industry as a whole or by the Company.
 
     Certain of the Company's insurance and annuity products are innovative and
relatively new. The Company is operating within a new regulatory framework as a
subsidiary of a mutual holding company which, in turn, has a converted stock
insurer as a subsidiary. The regulatory framework at the state and federal level
applicable to insurance and annuity products and the mutual holding company
structure is evolving. The changing regulatory framework could affect the design
or profitability of such products and the Company's ability to sell certain
products. For example, in August 1997, the SEC requested information and
comments about the structure of equity index insurance products, the manner in
which they are marketed and the federal securities law issues raised by equity
index insurance products. It is possible that the SEC may propose new
 
                                       16
<PAGE>   37
 
regulations or policies with respect to equity index insurance products which
may affect the marketing of such products or impose requirements that some or
all such products be registered with the SEC.
 
RISKS OF CLASS ACTION LITIGATION
 
     In recent years, a number of life insurance companies, including AmerUs
Life, have been named defendants in class action lawsuits arising out of their
business practices. AmerUs Life recently settled one such class action lawsuit,
although the exact amount of such settlement is yet to be determined. Although
AmerUs Life has denied all allegations against it and has vigorously defended
against the remaining class action lawsuit which has been brought against AmerUs
Life, there can be no assurance that such litigation, or similar litigation
filed in the future, will not have a material adverse affect on the life
insurance industry generally or on the Company. See "Management's Discussion and
Analysis of Results of Operations and Financial Condition."
 
RISKS RELATING TO THE CLOSED BLOCK
 
     In connection with the Reorganization, AmerUs Life was required to allocate
specific assets for the benefit of insurance policies and annuities existing at
the time of the Reorganization that pay dividends or provide interest credits.
This is known as a "Closed Block." The Closed Block is designed to provide
reasonable assurance to owners of policies included therein that, after the
Reorganization, assets would be available to maintain the dividend scales and
interest credits in effect prior to the Reorganization if the experience
underlying such scales and credits continues. The investment performance of the
assets in the Closed Block and the performance of the policies covered by the
Closed Block will affect future dividends and interest credits. Any excess of
cumulative favorable experience for Closed Block policies over unfavorable
experience will be available for distribution over time to Closed Block
policyowners and will not be available to AmerUs Life or the Company. Unless the
Iowa Commissioner consents to an earlier termination, the Closed Block will
continue to be in effect until the date on which none of the policies in the
Closed Block remains in force.
 
     The Company will continue to pay guaranteed benefits under all policies,
including the policies included in the Closed Block, in accordance with their
terms. If the assets allocated to the Closed Block, the investment cash flows
from those assets and the revenues from the policies included in the Closed
Block including investment income thereon prove to be insufficient to pay the
benefits guaranteed under the policies included in the Closed Block, the Company
will be required to make such payments from its general funds. The Company bears
the costs of operating and managing the Closed Block and, accordingly, such
costs were not funded as part of the assets allocated to the Closed Block. Any
increase in such costs in the future would be borne by the Company. See
"Reorganization and Recent Acquisitions -- The Reorganization -- Establishment
and Operation of the Closed Block."
 
RISKS RELATING TO YEAR 2000 COMPLIANCE
 
     As the year 2000 approaches, an important business issue has emerged
regarding how existing application software programs and operating systems can
accommodate the date value "2000." Many existing application software products
were designed to only accommodate a two digit date position which represents the
year (e.g., the number "95" is stored on the system and represents the year
1995). As a result, the year 1999 (i.e., "99") is the maximum date value many
systems will be able to accurately process. The Company formed a year 2000
working group to address potential problems posed by this development to assure
that the Company is prepared for year 2000. Total estimated costs are in a range
of $4 to $6 million with approximately $3 million to be incurred in 1998.
However, if modifications and conversions to deal with year 2000 issues are not
completed on a timely basis or are not fully effective, such issues may have a
material adverse effect on the operations of the Company. All costs associated
with year 2000 modifications and conversions will be expensed as incurred. See
"Management's Discussion and Analysis of Results of Operations and Financial
Condition -- Year 2000 Compliance."
 
                                       17
<PAGE>   38
 
CLASS A COMMON STOCK ELIGIBLE FOR FUTURE SALE
 
     Sales of substantial amounts of Class A Common Stock (including shares of
the Company's Class B common stock converted into Class A Common Stock), or the
perception that such sales could occur, could have an adverse effect on the
price of the Class A Common Stock. As of December 31, 1997, AMHC beneficially
owned 12,380,300 shares of Class A Common Stock. All of the shares of Class A
Common Stock which are currently beneficially owned by AMHC are eligible for
sale under SEC rules, subject to certain volume and timing limitations and
restrictions imposed on AMHC, as a mutual holding company, by Iowa law.
 
                                USE OF PROCEEDS
 
     Unless otherwise indicated in the accompanying Prospectus Supplement, the
net proceeds received by the Company from the sale of the Securities offered
hereby are expected to be used for general corporate purposes. The proceeds from
the sale of Capital Securities by the AmerUs Trusts will be invested in the
Junior Subordinated Debt of the Company. Except as may otherwise be described in
the Prospectus Supplement relating to such Capital Securities, the Company
expects to use the net proceeds from the sale of such Junior Subordinated Debt
to the AmerUs Trusts for general corporate purposes. Any specific allocation of
the proceeds to a particular purpose that has been made at the date of any
Prospectus Supplement will be described therein.
 
                                       18
<PAGE>   39
 
                     REORGANIZATION AND RECENT ACQUISITIONS
 
THE REORGANIZATION
 
     BACKGROUND AND DESCRIPTION OF THE REORGANIZATION
 
     On October 27, 1995, the Board of Directors of American Mutual Life adopted
the plan of reorganization (the "AmerUs Reorganization Plan"), pursuant to which
AMHC was formed as a mutual insurance holding company and American Mutual Life
was converted into a stock life insurance company and its name was changed to
AmerUs Life Insurance Company.
 
     As part of the Reorganization, all of the shares of capital stock of AmerUs
Life were issued to AMHC. Subsequently, AMHC contributed all of its shares of
capital stock of AmerUs Life to AmerUs Group, which contributed such shares to
the Company, AmerUs Group's then wholly-owned subsidiary. Under this structure,
the Company is an intermediate holding company, with AmerUs Group as its direct
controlling shareholder and AmerUs Life as its wholly-owned subsidiary. Under
Iowa law, AMHC is required to retain direct or indirect ownership and control of
shares which carry the right to cast a majority of the votes entitled to be cast
by holders of the outstanding capital stock of AmerUs Life.
 
     Iowa legislation permits AMHC to demutualize, a process which would cause
AMHC to convert from mutual to stock form and become publicly owned by
shareholders. Pursuant to the Company's Articles of Incorporation, upon a
demutualization of AMHC, all of the Company's shares of outstanding Class B
Common Stock will automatically convert into shares of Class A Common Stock. See
"Description of Capital Stock." AMHC has advised the Company that AMHC has no
present plans to demutualize.
 
     ESTABLISHMENT AND OPERATION OF THE CLOSED BLOCK
 
     In connection with the Reorganization, the Closed Block was established.
Insurance policies which had a dividend scale in effect as of June 30, 1996 were
included in the Closed Block. The Closed Block was designed to provide
reasonable assurance to policyowners included therein that, after the
Reorganization, assets will be available to maintain the dividend scales and
interest credits in effect prior to the Reorganization if the experience
underlying such scales and credits continues. The establishment of the Closed
Block did not alter, diminish, reduce or in any other way adversely affect these
policyowners' contractual rights.
 
     Pursuant to the AmerUs Reorganization Plan, assets were allocated to the
Closed Block at June 30, 1996 in an amount which the Company expects to produce
cash flows which, together with anticipated revenues from the policies in the
Closed Block, are expected to be sufficient to support the Closed Block
business, including provision for payment of claims, taxes and certain other
expenses and for the continuation of dividend scales and interest credits in
effect prior to the Reorganization if the experience underlying such scales and
credits continues or for appropriate adjustments in such scales and credits if
the experience changes. The assets, including the revenue therefrom, allocated
to the Closed Block will accrue solely to the benefit of policyowners included
in the Closed Block business until such time as the Closed Block is no longer in
effect. To the extent that over time cash flows from the assets allocated to the
Closed Block and other experience relating to the Closed Block are, in the
aggregate, more or less favorable than assumed in establishing the Closed Block,
total dividends and interest credits paid to Closed Block policyowners in the
future may be greater than or less than the total dividends and interest credits
that would have been paid to these policyowners if the dividend scales and
interest credits in effect prior to the Reorganization had been continued.
Dividends and interest credits on policies included in the Closed Block, as in
the past, will be declared at the discretion of AmerUs Life's Board of Directors
and may vary from time to time (reflecting changes in investment, mortality,
persistency and other experience factors).
 
     AmerUs Life will continue to pay guaranteed benefits under all policies,
including the policies included in the Closed Block, in accordance with their
terms. If the assets allocated to the Closed Block, the investment cash flows
from those assets and the revenues from the policies included in the Closed
Block, including investment income thereon, prove to be insufficient to pay the
benefits guaranteed under the policies included in the Closed Block, AmerUs Life
will be required to make such payments from its general funds. AmerUs Life bears
the costs of operating and managing the Closed Block and, accordingly, such
costs were not funded
                                       19
<PAGE>   40
 
as part of the assets allocated to the Closed Block. Any increase in such costs
in the future would be borne by AmerUs Life.
 
     The Closed Block will continue in effect until either (i) the last policy
in the Closed Block is no longer in force or (ii) the Closed Block is dissolved.
The AmerUs Reorganization Plan provides that the Closed Block may not be
dissolved without the approval of the Iowa Commissioner, which approval could
only be obtained if dissolution were demonstrated not to be adverse to the
interests of the policyowners whose policies make up the Closed Block. If the
Closed Block is dissolved, the assets associated with the Closed Block will
become part of AmerUs Life's general funds. If the Closed Block is not
dissolved, the expected life of the Closed Block is in excess of 75 years.
 
     At December 31, 1997, the Closed Block had assets of $1,391.8 million and
liabilities of $1,623.4 million. The excess of Closed Block Liabilities over
Closed Block Assets represents the expected future after-tax contributions
(before certain other expense charges, which were not funded in the Closed
Block) from the Closed Block which may be recognized in income over the period
the policies in the Closed Block remain in force.
 
     If the actual contribution from the Closed Block in any given period equals
or exceeds the expected contribution for such period as determined at the
establishment of the Closed Block, only the expected contribution would be
recognized in income from continuing operations for that period. Any excess of
the actual contribution over the expected contribution is recognized in income
from continuing operations to the extent that the aggregate expected
contribution for all prior periods exceeded the aggregate actual contribution.
Any remaining excess of actual contribution over expected contributions would be
accrued in the Closed Block as a liability for future policyowners' dividends.
This accrual for future dividends effectively limits the actual Closed Block
contribution recognized in income from continuing operations to the Closed Block
contribution expected to emerge from operation of the Closed Block as determined
as of the date of establishment of the Closed Block.
 
     If the actual contribution from the Closed Block in any given period is
less than the expected contribution for that period, because changes in
dividends scales are inadequate to offset the negative performance in relation
to the expected performance, the contribution inuring to shareholders of AmerUs
Life will be reduced. If a liability for policyowners' dividends had been
previously established in the Closed Block because the actual contribution to
the relevant date had exceeded the expected contribution to such date, such
liability would be reduced (but not below zero) in any periods in which the
actual contribution for that period is less than the expected contribution for
such period.
 
ACQUISITION OF DELTA LIFE CORPORATION
 
     On October 23, 1997, the Company acquired all of the outstanding capital
stock of Delta for approximately $165 million in cash. The principal asset of
Delta is its wholly-owned subsidiary, Delta Life, a Tennessee-domiciled life
insurance company and, following its acquisition by the Company, redomiciled to
Iowa in 1998. Delta Life is licensed in the District of Columbia and in all
states except New York, and specializes in the sale of individual single and
flexible premium deferred annuities, primarily in the southeastern, western,
southwestern and midwestern regions of the United States. Sales are made
primarily through a network of over 3,300 independent agents. Approximately 58%
of Delta Life's 1997 direct collected premiums were derived from
retirement-oriented tax-qualified annuities. As of December 31, 1997, Delta Life
had approximately 52,000 annuity contracts outstanding.
 
     Delta Life's strategy is to structure its fixed annuity products to appeal
to the conservative retirement saver who is seeking principal preservation and
consistency of earnings. Most of Delta Life's products are innovative in that
they incorporate a fixed contractual management fee. In addition to offering a
lifetime guaranteed minimum interest crediting rate and an annual guaranteed
interest crediting rate, these annuities also require the crediting of the
interest rate earned on the assets supporting the respective policies after
deducting the contractual management fee. Over 70% of policyowners' assets are
invested in securities issued, secured or guaranteed by the U.S. Government,
government agencies or government instrumentalities.
 
                                       20
<PAGE>   41
 
     The Delta Acquisition increased the Company's presence in the rapidly
growing asset accumulation business, significantly expanded the Company's
distribution capacity, provided the Company access to Delta's extensive
marketing capabilities, expanded the Company's presence in the south and
southeast and expanded the Company's offering of competitive products that meet
the demands of consumers. By integrating the operations of Delta Life with those
of AmerUs Life, the Company substantially reduced the unit costs of both AmerUs
Life's and Delta Life's general insurance expenses and investment expenses by
spreading fixed costs over a larger revenue base. The Delta Acquisition also
increased and diversified the Company's distribution channels.
 
ACQUISITION OF AMVESTORS FINANCIAL CORPORATION
 
     On December 19, 1997 the Company acquired AmVestors in a stock exchange
valued at approximately $350 million. AmVestors' principal operating
subsidiaries are American, a Kansas domiciled life insurance company licensed in
48 states and the District of Columbia and FBL, a Kansas domiciled life
insurance company doing business in 40 states, the District of Columbia and the
U.S. Virgin Islands. AmVestors distributes its products through a national
network of approximately 7,800 licensed independent agents. As of December 31,
1997, AmVestors had approximately 104,000 annuity contracts outstanding.
 
     AmVestors specializes in the sale of annuity products, further
strengthening the Company's presence in the rapidly growing asset accumulation
and retirement savings markets. AmVestors' strategy is to focus on the dynamics
of the growing retirement market and the need for easily-administered, low-risk
annuities. AmVestors continually enhances its products based on market
conditions. The time frame for new product releases is generally less than two
months from conceptualization to rollout. Outstanding service to its
policyholders, including easy-to-read statements; quick delivery of policies and
turnaround on customer service calls; 24-hour-a-day product and customer
information availability and systematic withdrawal represent other areas of
strategic focus of AmVestors.
 
                                       21
<PAGE>   42
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 RESULTS OF OPERATIONS AND FINANCIAL CONDITION
 
     The following analysis of the consolidated results of operations and
financial condition of the Company should be read in conjunction with the
Selected Consolidated Financial and Operating Data and the Consolidated
Financial Statements of the Company and related notes included elsewhere or
incorporated by reference in this Prospectus.
 
OVERVIEW
 
     The Company is a holding company engaged through its subsidiaries in the
business of marketing, underwriting and distributing a broad range of individual
life insurance and annuity products to individuals and businesses in 49 states,
the District of Columbia and the U.S. Virgin Islands. The Company's primary
product offerings consist of whole life, universal life and term life insurance
policies and fixed annuities. Since April 1, 1996 the Company has been a party
to the Ameritas Joint Venture with Ameritas, through which it markets fixed
annuities and sells variable annuities and variable life insurance products. See
"Business -- Products."
 
     In accordance with GAAP, universal life insurance premiums and annuity
deposits received are reflected as increases in liabilities for policyowner
account balances and not as revenues. Revenues reported for universal life and
annuity products consist of policy charges for the cost of insurance,
administration charges and surrender charges assessed against policyowner
account balances. Surrender benefits paid relating to universal life insurance
policies and annuity products are reflected as decreases in liabilities for
policyowner account balances and not as expenses. Amounts for interest credited
to universal life and annuity policyowner account balances and benefit claims in
excess of policyowner account balances are reported as expenses in the financial
statements. The Company receives investment income earned from the funds
deposited into account balances by universal life and annuity policyowners, the
majority of which is passed through to such policyowners in the form of interest
credited.
 
     Premium revenues reported for traditional life insurance products are
recognized as revenues when due. Future policy benefits and policy acquisition
costs are recognized as expenses over the life of the policy by means of a
provision for future policy benefits and amortization of deferred policy
acquisition costs.
 
     The costs related to acquiring new business, including certain costs of
issuing policies and certain other variable selling expenses (principally
commissions), defined as deferred policy acquisition costs, are capitalized and
amortized as an expense primarily in proportion to expected profits or margins
from such policies. This amortization is adjusted when current or estimated
future gross profits or margins on the underlying policies vary from previous
estimates. For example, the amortization of deferred policy acquisition costs is
accelerated when policy terminations are higher than originally estimated or
when investments supporting the policies are sold at a gain prior to their
anticipated maturity. Death and other policyowner benefits reflect exposure to
mortality risk and fluctuate from period to period based on the level of claims
incurred within insurance retention limits. The profitability of the Company is
primarily affected by expense levels, interest spread results (i.e., the excess
of investment earnings over the interest credited to policyowners) and
fluctuations in mortality, persistency and other policyowner benefits. The
Company has the ability to mitigate adverse experience through adjustments to
credited interest rates, policyowner dividends or cost of insurance charges.
 
ADJUSTED OPERATING INCOME
 
     The following table reflects net income adjusted to eliminate certain items
(net of applicable income taxes) which management believes are not necessarily
indicative of overall operating trends, including net realized gains or losses
on investments. Different items are likely to occur in each period presented and
others
 
                                       22
<PAGE>   43
 
may have different opinions as to which items may warrant adjustment. The
adjusted operating income shown below does not constitute net income computed in
accordance with GAAP.
 
<TABLE>
<CAPTION>
                                                               YEAR ENDED DECEMBER 31,
                                                ------------------------------------------------------
                                                 1997        1996        1995       1994        1993
                                                 ----        ----        ----       ----        ----
                                                       (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                             <C>        <C>         <C>         <C>        <C>
Net income..................................    $58,059    $ 74,173    $ 69,348    $ 6,667    $ 31,209
Net realized (gains) losses on
  investments(A)............................     (9,008)    (42,552)    (32,244)    11,223     (10,187)
Equity add-on tax(B)........................         --       4,480          --      9,585          --
Reorganization costs(C).....................         --       1,522       1,426         --          --
Adoption of SFAS 106(D).....................         --          --          --         --       3,214
                                                -------    --------    --------    -------    --------
Adjusted operating income...................    $49,051    $ 37,623    $ 38,530    $27,475    $ 24,236
                                                =======    ========    ========    =======    ========
Adjusted operating income per common
  share.....................................      $2.08       $1.62       $1.66         --          --
</TABLE>
 
- - -------------------------
(A) Represents realized gains or losses on investments less that portion of the
    amortization of deferred policy acquisition costs adjusted for income taxes
    on such amounts. Realized gains may vary widely between periods. Such
    amounts are determined by management's timing of individual transactions and
    do not necessarily correspond to the underlying operating trends.
 
(B) Represents the mutual life insurance company equity add-on tax, which is
    applicable only to mutual life insurance companies and which the Company
    believes is not applicable to the Company after June 30, 1996 due to AmerUs
    Life's conversion into a stock company.
 
(C) Represents costs directly related to the Reorganization consisting primarily
    of printing, postage, legal and consulting costs adjusted for income taxes
    on such amounts. These costs were not of a continuing nature and were not
    expected to have any effect on future operations.
 
(D) As of January 1, 1993, the Company adopted SFAS 106, pursuant to which the
    cost of certain post-retirement benefits must be recognized on an accrual
    basis as employees perform services to earn such benefits. The Company's
    transition obligation as of January 1, 1993 amounted to approximately $3.2
    million, net of income tax benefits, and was recorded as a cumulative effect
    adjustment to net income.
 
RECENT ACQUISITIONS
 
     The Company acquired all of the outstanding stock of Delta on October 23,
1997, for approximately $165 million in cash. The transaction was accounted for
as a purchase and accordingly, the Company's results of operations include Delta
from the date of purchase. The Company acquired all of the outstanding stock of
AmVestors on December 19, 1997, in a stock exchange valued at approximately $350
million. This transaction was also accounted for as a purchase and the Company's
results of operations include AmVestors from the date of purchase. See
"Reorganization and Recent Acquisitions -- Acquisition of Delta Life Corporation
and -- Acquisition of AmVestors Financial Corporation".
 
THE CLOSED BLOCK
 
     The Closed Block was established on June 30, 1996. Insurance policies which
had a dividend scale in effect as of June 30, 1996 were included in the Closed
Block. The Closed Block was designed to provide reasonable assurance to owners
of insurance policies included therein that, after the Reorganization, assets
would be available to maintain the dividend scales and interest credits in
effect prior to the Reorganization if the experience underlying such scales and
credits continues. See "Risk Factors -- Risks Relating to the Closed Block" and
"Reorganization and Recent Acquisitions -- Establishment and Operation of the
Closed Block".
 
     The contribution to the operating income of the Company from the Closed
Block is reported as a single line item in the income statement. Accordingly,
premiums, product charges, investment income, realized gains (losses) on
investments, policyowner benefits and dividends attributable to the Closed
Block, less certain
 
                                       23
<PAGE>   44
 
minor expenses including amortization of deferred policy acquisition costs, are
shown as a net number under the caption the "Contribution from the Closed
Block." This results in material reductions in the respective line items in the
income statement while having no effect on net income. The expenses associated
with the administration of the policies included in the Closed Block and the
renewal commissions on these policies are not charged against the Contribution
from the Closed Block, but rather are grouped with underwriting, acquisition and
insurance expenses. Also, all assets allocated to the Closed Block are grouped
together and shown as a separate item entitled "Closed Block Assets." Likewise,
all liabilities attributable to the Closed Block are combined and disclosed as
the "Closed Block Liabilities."
 
COMBINED RESULTS OF OPERATIONS
 
     Since the operating results from the Closed Block are reported on one line
of the income statement, "Contribution from the Closed Block," individual income
statement components are not fully comparable with those prior to the
establishment of the Closed Block. Management believes that the presentation of
the results of operations for 1997 on a combined basis as if the Closed Block
had not been formed facilitates comparability with the results of operations for
1996 prior to the formation of the Closed Block and for 1995. Accordingly, the
combined presentation set forth below includes certain revenues and expenses
associated with policies included in the Closed Block. Such presentation does
not, however, affect the Company's reported net income.
 
<TABLE>
<CAPTION>
                                                                  YEAR ENDED DECEMBER 31, 1997
                                                                --------------------------------
                                                                   AS        CLOSED
                                                                REPORTED     BLOCK      COMBINED
                                                                --------     ------     --------
                                                                         (IN THOUSANDS)
<S>                                                             <C>         <C>         <C>
Revenues
  Insurance premiums........................................    $ 48,127    $206,145    $254,272
  Product charges...........................................      43,441      17,464      60,905
  Net investment income.....................................     224,431     113,759     338,190
  Realized gains on investments.............................      13,791         718      14,509
  Contribution from the Closed Block........................      31,045     (31,045)         --
                                                                --------    --------    --------
       Total revenues.......................................     360,835     307,041     667,876
Benefits and expenses
  Policyowner benefits......................................     193,237     209,377     402,614
  Underwriting, acquisition and insurance expenses..........      51,663       6,603      58,266
  Amortization of deferred policy acquisition costs.........      20,987      31,470      52,457
  Dividends to policyowners.................................       1,587      59,591      61,178
                                                                --------    --------    --------
       Total benefits and expenses..........................     267,474     307,041     574,515
Income from operations......................................      93,361          --      93,361
Interest expense............................................      14,980          --      14,980
                                                                --------    --------    --------
Income before income tax expense and equity in earnings of
  unconsolidated subsidiary.................................      78,381          --      78,381
Income tax expense..........................................      22,022          --      22,022
                                                                --------    --------    --------
Income before equity in earnings of unconsolidated
  subsidiary................................................      56,359          --      56,359
Equity in earnings of unconsolidated subsidiary.............       1,700          --       1,700
                                                                --------    --------    --------
       Net income...........................................    $ 58,059    $     --    $ 58,059
                                                                ========    ========    ========
</TABLE>
 
                                       24
<PAGE>   45
 
<TABLE>
<CAPTION>
                                                                  YEAR ENDED DECEMBER 31, 1996
                                                                --------------------------------
                                                                   AS        CLOSED
                                                                REPORTED     BLOCK      COMBINED
                                                                --------     ------     --------
                                                                         (IN THOUSANDS)
<S>                                                             <C>         <C>         <C>
Revenues
  Insurance premiums........................................    $138,476    $108,315    $246,791
  Product charges...........................................      49,347       9,324      58,671
  Net investment income.....................................     228,625      56,329     284,954
  Realized gains on investments.............................      65,983         481      66,464
  Contribution from the Closed Block........................      19,909     (19,909)         --
                                                                --------    --------    --------
       Total revenues.......................................     502,340     154,540     656,880
Benefits and expenses
  Policyowner benefits......................................     261,869     103,951     365,820
  Underwriting, acquisition and insurance expenses..........      54,857       2,969      57,826
  Amortization of deferred policy acquisition costs.........      40,160      18,412      58,572
  Dividends to policyowners.................................      26,324      29,208      55,532
                                                                --------    --------    --------
       Total benefits and expenses..........................     383,210     154,540     537,750
Income from operations......................................     119,130          --     119,130
Interest expense............................................       2,142          --       2,142
                                                                --------    --------    --------
Income before income tax expense and equity in earnings of
  unconsolidated subsidiary.................................     116,988          --     116,988
Income tax expense..........................................      43,859          --      43,859
                                                                --------    --------    --------
Income before equity in earnings of unconsolidated
  subsidiary................................................      73,129          --      73,129
Equity in earnings of unconsolidated subsidiary.............       1,044          --       1,044
                                                                --------    --------    --------
       Net income...........................................    $ 74,173    $     --    $ 74,173
                                                                ========    ========    ========
</TABLE>
 
     1997 COMPARED TO 1996
 
     A summary of the Company's combined revenues, including revenues associated
with the Closed Block, follows:
 
<TABLE>
<CAPTION>
                                                                  YEAR ENDED
                                                                 DECEMBER 31,
                                                             --------------------
                                                               1997        1996
                                                               ----        ----
                                                                (IN THOUSANDS)
<S>                                                          <C>         <C>
Insurance premiums
  Traditional life insurance premiums....................    $236,878    $228,986
  Immediate annuity and supplementary contract
     premiums............................................      17,238      16,082
  Other premiums.........................................         156       1,723
                                                             --------    --------
       Total insurance premiums..........................     254,272     246,791
Universal life product charges...........................      59,236      57,834
Annuity product charges..................................       1,669         837
                                                             --------    --------
       Total product charges.............................      60,905      58,671
Net investment income....................................     338,190     284,954
Realized gains on investments............................      14,509      66,464
                                                             --------    --------
       Total revenues....................................    $667,876    $656,880
                                                             ========    ========
</TABLE>
 
     In 1997, individual life and annuity premiums and product charges increased
by $11.2 million to $315.0 million, or 3.7%, from $303.8 million in 1996.
Included in this increase was $1.2 million of premium and product charges earned
in the fourth quarter resulting primarily from Delta. Insurance premiums
increased by $7.5 million to $254.3 million in 1997 compared to $246.8 million
in 1996. Traditional life
 
                                       25
<PAGE>   46
 
insurance premiums increased by $7.9 million in 1997. The increase in
traditional life insurance premiums in 1997 was primarily the result of
continued growth in renewal premiums and also the increased sales of term life
insurance products. Changes in the level of immediate annuity deposits and
supplementary contract premiums were primarily the result of fluctuations in
immediate annuity and supplementary contract sales. Other premiums decreased in
1997 primarily due to the sale of the Company's remaining group life operation
in 1996.
 
     Universal life product charges increased slightly in 1997 primarily due to
increased cost of insurance charges as a result of the normal aging of that
block of business. Annuity product charges for 1997 included $0.7 million earned
in the fourth quarter by recently acquired companies.
 
     Net investment income increased by $53.3 million to $338.2 million in 1997
compared to $284.9 million in 1996. Included in the 1997 increase in net
investment income was $30.2 million of net investment income from recently
acquired companies during the fourth quarter. The remaining $23.1 million
increase in 1997 was attributable to an increase in average invested assets and
effective yields on average invested assets. Average invested assets (excluding
market value adjustments and acquisitions) in 1997 increased by $111.5 million
from 1996, and the effective yield on average invested assets (excluding market
value adjustments and acquisitions) increased to 7.89% in 1997 from 7.55% in
1996. Contributing to the higher yields in 1997 was investment income of $10.1
million from equity in earnings of certain investment partnerships.
 
     Realized gains on investments were $14.5 million in 1997 compared to gains
of $66.4 million in 1996. Included in the amounts for 1996 were approximately
$51.1 million of gains from the sale of common stock as a result of the
liquidation of the Company's equity portfolio primarily during the first quarter
of 1996.
 
     A summary of the Company's combined policyowner benefits, including
policyowner benefits associated with the Closed Block, follows:
 
<TABLE>
<CAPTION>
                                                                  YEAR ENDED
                                                                 DECEMBER 31,
                                                              -------------------
                                                                1997       1996
                                                                ----       ----
                                                                (IN THOUSANDS)
<S>                                                           <C>        <C>
Traditional life insurance
  Death benefits............................................  $ 40,821   $ 32,251
  Change in liability for future policy benefits and other
     policy benefits........................................   170,275    160,036
                                                              --------   --------
     Total traditional life insurance benefits..............   211,096    192,287
Universal life insurance
  Death benefits in excess of cash value....................    24,682     23,871
  Interest credited to policyowner account balances.........    45,232     43,203
  Other policy benefits.....................................     3,453      3,026
                                                              --------   --------
     Total universal life insurance benefits................    73,367     70,100
Annuities
  Interest credited to deferred annuity account balances....    80,440     66,254
  Other annuity benefits....................................    37,133     34,334
                                                              --------   --------
     Total annuity benefits.................................   117,573    100,588
Miscellaneous benefits......................................       578      2,845
                                                              --------   --------
     Total policyowner benefits.............................  $402,614   $365,820
                                                              ========   ========
</TABLE>
 
     Total policyowner benefits were $402.6 million in 1997 compared to $365.8
million in 1996 or an increase of $36.8 million. The 1997 amount included fourth
quarter benefits of acquired companies of $23.4 million consisting primarily of
interest credited to annuity account balances and other annuity benefits.
 
     Traditional life insurance benefits increased by $18.8 million in 1997. The
increase in 1997 was primarily due to the growth and aging of the business in
force and increased death benefits as a result of higher mortality. Universal
life insurance benefits increased by $3.3 million in 1997. The increased
benefits in 1997 were due to increased interest credited to policyowner account
balances and increased death benefits due to
 
                                       26
<PAGE>   47
 
higher mortality. While the weighted average crediting rate for AmerUs Life's
universal life liabilities decreased four basis points to 6.23% in 1997 from
6.27% in 1996, AmerUs Life's average liabilities increased by $33.7 million from
1996 to 1997, resulting in the increased credited amounts in 1997.
 
     Annuity benefits, including the fourth quarter results of recent
acquisitions, were $117.6 million, an increase of $17.0 million compared to
1996. The annuity benefits of recent acquisitions amounted to $23.2 million
which were partially offset by a $6.2 million decrease in AmerUs Life's annuity
benefits in 1997 to $94.4 million compared to $100.6 million in 1996. The
decrease in AmerUs Life's annuity benefits during 1997 was due to reduced
interest credited to policyowner account balances. The weighted average
crediting rate for AmerUs Life's individual deferred annuity liabilities
decreased eleven basis points to 5.25% in 1997 compared to 5.36% in 1996 and
AmerUs Life's average deferred annuity liabilities decreased by $119.1 million
from 1996 to 1997, also contributing to the lower interest credited amounts in
1997 for AmerUs Life. Most annuity sales after May, 1996 have been recorded by
the Ameritas Joint Venture, resulting in a decrease in the average deferred
annuity liabilities at AmerUs Life.
 
     Miscellaneous benefits decreased in 1997 primarily due to the sale of the
Company's remaining group life operation in 1996.
 
     A summary of the Company's combined expenses, including expenses associated
with the Closed Block, follows:
 
<TABLE>
<CAPTION>
                                                                  YEAR ENDED
                                                                 DECEMBER 31,
                                                             --------------------
                                                               1997        1996
                                                               ----        ----
<S>                                                          <C>         <C>
Commission expense, net of deferrals.....................    $  8,252    $  7,892
Other underwriting, acquisition and insurance expenses,
  net of deferrals.......................................      50,014      49,934
Amortization of deferred policy acquisition costs........      52,457      58,572
                                                             --------    --------
     Total expenses......................................    $110,723    $116,398
                                                             ========    ========
</TABLE>
 
     The Company's commission expense, net of deferrals, increased by $0.4
million to $8.3 million in 1997, compared to $7.9 million in 1996. The increase
in 1997 was primarily the result of the fourth quarter commission expense, net
of deferrals, of the Company's recent acquisitions. Other underwriting,
acquisition and insurance expenses, net of deferrals, were $50.0 million in
1997, compared to $49.9 million in 1996. Included in the 1997 expenses were $4.1
million of fourth quarter expenses, net of deferrals, attributable to the
recently acquired companies.
 
     Excluding recently acquired companies, other underwriting, acquisition and
insurance expenses, net of deferrals, decreased by $4.0 million to $45.9 million
in 1997. This decrease in expenses during 1997 was primarily due to the
establishment of a $5.0 million litigation reserve during 1996 in connection
with certain class action litigation, partially offset by a $1.3 million
write-off of expenses during 1997 related to the former bank credit facility
which was replaced by a new agreement in the fourth quarter of 1997.
 
     The amortization of deferred policy acquisition costs decreased by $6.1
million in 1997. Deferred policy acquisition costs are generally amortized in
proportion to gross margins, including realized capital gains. Higher death
benefits and lower realized capital gains in 1997, compared to 1996, contributed
to lower gross margins in 1997 on products for which deferred costs are
amortized, resulting in the lower amortization in 1997.
 
     Dividends to policyowners increased by $5.7 million, to $61.2 million in
1997 compared to $55.5 million in 1996. The increase in dividends was primarily
the result of the growth and aging of in force business. Traditional life
reserves grew 8.1% to the end of 1997, to $1.31 billion. The weighted average
dividend interest rate credited to these policies was 7.19% in 1997 compared to
7.17% in 1996.
 
     Income from operations decreased by $25.7 million, to $93.4 million in 1997
compared to $119.1 million in 1996. Recent acquisitions added $3.3 million of
income from operations during the fourth quarter. However,
 
                                       27
<PAGE>   48
 
the overall decrease in 1997 income from operations was primarily due to the
decrease in realized gains on investments in 1997.
 
     Interest expense increased by $12.9 million in 1997 to $15.0 million
compared to $2.1 million in 1996. The increase in interest expense in 1997 was
primarily due to the interest expense on the capital securities issued by the
Company during 1997 and interest expense on the revolving line of credit. This
added interest expense was largely offset by investment of the borrowed funds
which contributed to the growth in invested assets and the higher investment
earnings of 1997.
 
     Income before income tax expense and equity in earnings of unconsolidated
subsidiary decreased by $38.6 million to $78.4 million in 1997 compared to
$117.0 million in 1996. While acquisitions added $3.3 million of income before
income tax expense during the fourth quarter, the overall decrease in 1997
income resulted primarily from the decrease in realized gains on investments in
1997.
 
     Income tax expense decreased by $21.8 million in 1997 to $22.0 million
compared to $43.8 million in 1996. The decrease in 1997 was primarily due to the
lower pre-tax income as a result of the lower realized gains on investments, a
$4.5 million provision for the equity add-on tax included in the first half of
1996, and increased tax credits of $3.9 million in 1997. The equity add-on tax
is applicable only to mutual life insurance companies and the Company believes
such tax is not applicable to the Company after June 30, 1996 due to the
conversion of AmerUs Life into a stock company.
 
     Net income decreased by $16.1 million in 1997 to $58.1 million compared to
$74.2 million in 1996. Net income for 1997 included $1.8 million resulting from
acquisitions during the fourth quarter. The overall lower net income for 1997
was primarily due to lower realized gains on investments.
 
     1996 COMPARED TO 1995
 
     A summary of the Company's combined revenues, including revenues associated
with the Closed Block, follows:
 
<TABLE>
<CAPTION>
                                                               YEAR ENDED
                                                              DECEMBER 31,
                                                           -------------------
                                                             1996       1995
                                                             ----       ----
                                                             (IN THOUSANDS)
<S>                                                        <C>        <C>
Insurance premiums
  Traditional life insurance premiums....................  $228,986   $219,732
  Immediate annuity and supplementary contract
     premiums............................................    16,082     17,659
  Other premiums.........................................     1,723      6,696
                                                           --------   --------
     Total insurance premiums............................   246,791    244,087
Universal life product charges...........................    57,834     56,763
Annuity product charges..................................       837        607
                                                           --------   --------
     Total product charges...............................    58,671     57,370
Net investment income....................................   284,954    285,244
Realized gains on investments............................    66,464     51,387
                                                           --------   --------
     Total revenues......................................  $656,880   $638,088
                                                           ========   ========
</TABLE>
 
     In 1996, individual life and annuity premiums and product charges increased
by $9.0 million to $303.8 million, or 3.1%, from $294.8 million in 1995.
Insurance premiums increased by $2.7 million to $246.8 million in 1996 compared
to $244.1 million in 1995. Traditional life insurance premiums increased by $9.3
million in 1996. The increase in traditional life insurance premiums in 1996 was
primarily the result of continued growth in renewal premiums. Changes in the
level of immediate annuity deposits and supplementary contract premiums were
primarily the result of fluctuations in immediate annuity and supplementary
contract sales. Other premiums decreased significantly in 1996 primarily due to
the Company's exit from several group life and long-term disability reinsurance
pools in the second half of 1995 and the sale of the Company's remaining group
life operation in the third quarter of 1996.
 
                                       28
<PAGE>   49
 
     Universal life product charges increased slightly in 1996 primarily due to
increased cost of insurance charges as a result of the normal aging of that
block of business.
 
     Net investment income decreased by $0.3 million to $284.9 million in 1996
compared to $285.2 million in 1995. The decrease in net investment income in
1996 was attributable to an increase in average invested assets more than offset
by declines in the effective yields on average invested assets. Average invested
assets (excluding market value adjustments) increased by $171.8 million largely
as a result of the investment of the $175.0 million proceeds from bank
borrowings late during the year. The effective yield on average invested assets
(excluding market value adjustments) decreased to 7.55% in 1996 from 7.88% in
1995. The decrease in effective yield in 1996 was primarily due to lower bond
yields and the timing of the investment of the proceeds from the bank borrowing.
 
     Realized gains on investments were $66.4 million in 1996 compared to gains
of $51.4 million in 1995. Included in the amounts for 1996 were approximately
$51.1 million of gains from the sale of common stock as a result of the
liquidation of the Company's equity portfolio which commenced in 1995. The
increase in gains of $15.0 million in 1996 resulted primarily from increased
sales of common stock in the investment portfolio. The sale of common stock in
1996 and 1995 was a direct result of the Company's decision to reduce the level
of equity securities as a percentage of its investment portfolio on a long-term
basis. Proceeds from these sales were invested primarily in fixed maturity
securities.
 
     A summary of the Company's combined policyowner benefits, including
policyowner benefits associated with the Closed Block, follows:
 
<TABLE>
<CAPTION>
                                                                  YEAR ENDED
                                                                 DECEMBER 31,
                                                             --------------------
                                                               1996        1995
                                                               ----        ----
                                                                (IN THOUSANDS)
<S>                                                          <C>         <C>
Traditional life insurance
  Death benefits.........................................    $ 32,251    $ 32,196
  Change in liability for future policy benefits and
     other policy benefits...............................     160,036     152,742
                                                             --------    --------
       Total traditional life insurance benefits.........     192,287     184,938
Universal life insurance
  Death benefits in excess of cash value.................      23,871      20,802
  Interest credited to policyowner account balances......      43,203      41,532
  Other policy benefits..................................       3,026       5,218
                                                             --------    --------
       Total universal life insurance benefits...........      70,100      67,552
Annuities
  Interest credited to deferred annuity account
     balances............................................      66,254      78,120
  Other annuity benefits.................................      34,334      35,582
                                                             --------    --------
       Total annuity benefits............................     100,588     113,702
Miscellaneous benefits...................................       2,845       8,428
                                                             --------    --------
       Total policyowner benefits........................    $365,820    $374,620
                                                             ========    ========
</TABLE>
 
     Total policyowner benefits were $365.8 million in 1996 compared to $374.6
million in 1995. Traditional life insurance benefits increased by $7.3 million
in 1996 primarily due to the growth and aging of the business in force.
Universal life insurance benefits increased by $2.5 million in 1996. The
increased benefits in 1996 were due to increased interest credited to
policyowner account balances and increased death benefits due to higher
mortality. While the weighted average crediting rate for AmerUs Life's universal
life liabilities decreased 19 basis points to 6.27% in 1996 from 6.46% in 1995,
the AmerUs Life's average liabilities increased by $39.8 million from 1995 to
1996, resulting in the increased interest credited amounts in 1996.
 
     Annuity benefits decreased $13.1 million in 1996 to $100.6 million compared
to $113.7 million in 1995, primarily due to reduced interest credited to
policyowner account balances. The weighted average crediting
 
                                       29
<PAGE>   50
 
rate for AmerUs Life's individual deferred annuity liabilities decreased 80
basis points to 5.36% in 1996 compared to 6.16% in 1995 and AmerUs Life's
average deferred annuity liabilities decreased by $71.0 million from 1995 to
1996, also contributing to the lower interest credited amounts in 1996.
 
     Miscellaneous benefits decreased significantly in 1996 primarily due to the
Company's exit from several group life and long-term disability reinsurance
pools in the second half of 1995 and the sale of the Company's remaining group
life operation in the third quarter of 1996.
 
     A summary of the Company's combined expenses, including expenses associated
with the Closed Block, follows:
 
<TABLE>
<CAPTION>
                                                                  YEAR ENDED
                                                                 DECEMBER 31,
                                                             --------------------
                                                               1996        1995
                                                               ----        ----
                                                                (IN THOUSANDS)
<S>                                                          <C>         <C>
Commission expense, net of deferrals.....................    $  7,892    $ 10,448
Other underwriting, acquisition and insurance expenses,
  net of deferrals.......................................      49,934      40,461
Amortization of deferred policy acquisition costs........      58,572      50,239
                                                             --------    --------
     Total expenses......................................    $116,398    $101,148
                                                             ========    ========
</TABLE>
 
     The Company's commission expense, net of deferrals, decreased by $2.5
million to $7.9 million in 1996 compared to $10.4 million in 1995. The reduction
in 1996 was primarily due to a decrease in gross commission expense as a result
of lower life insurance sales in 1996 and the transfer of new annuity sales to
the Ameritas Joint Venture in May 1996. Other underwriting, acquisition and
insurance expenses, net of deferrals, increased to $49.9 million in 1996 from
$40.5 million in 1995. The increase in expenses in 1996 was due to increased
settlements and associated legal fees of $4.7 million, primarily due to the $5.0
million class action litigation reserve; expenses related to changing the name
of the Company of $0.7 million; higher premium taxes of $1.1 million due to a
one-time adjustment to the amortization of the guaranty association asset and an
increased accrual for estimated future assessments; combined with a gain of $3.1
million recorded against 1995 expenses resulting from the curtailment of the
Company's defined benefit pension plans effective December 31, 1995.
 
     The amortization of deferred policy acquisition costs increased by $8.3
million in 1996. The increased amortization in 1996 was primarily due to higher
gross margins, including increased realized capital gains in 1996, on products
for which deferred costs are amortized.
 
     Dividends to policyowners increased by $6.1 million, or 12.3%, to $55.5
million in 1996 compared to $49.4 million in 1995. The increase in dividends was
primarily the result of the growth and aging of in force business. Traditional
life reserves grew 7.7% from the end of 1995 to the end of 1996. The weighted
average dividend rate credited to these policies was 7.17% in 1996 compared to
7.14% in 1995.
 
     Income from operations increased to $119.1 million in 1996, compared to
$112.9 million in 1995. The increase in 1996 resulted primarily from the
increase in realized gains on investments.
 
     Income before income tax expense and equity in earnings of unconsolidated
subsidiary increased by $6.5 million to $117.0 million in 1996 compared to
$110.5 million in 1995. The increase in 1996 resulted primarily from the
increase in realized gains on investments.
 
     Income tax expense increased by $2.6 million in 1996 to $43.8 million
compared to $41.2 million in 1995. The increase in 1996 income taxes was
primarily the result of the higher pre-tax income due primarily to the increased
realized gains on investments and a $4.5 million provision for the equity add-on
tax in the first half of 1996, partially offset by $2.7 million of low-income
housing tax credits in 1996. The equity add-on tax is applicable only to mutual
life insurance companies and the Company believes such tax is not applicable to
the Company after June 30, 1996 due to the conversion of AmerUs Life into a
stock company.
 
                                       30
<PAGE>   51
 
     Net income increased by $4.9 million in 1996 to $74.2 million compared to
$69.3 million in 1995. The increased net income in 1996 was primarily due to
higher realized gains on investments.
 
LIQUIDITY AND CAPITAL RESOURCES
 
     THE COMPANY
 
     The Company's cash flows from operations consist of dividends from
subsidiaries, if declared and paid, interest income on loans and advances to its
subsidiaries (including a surplus note issued to the Company by AmerUs Life),
investment income on assets held by the Company and fees which the Company
charges its subsidiaries and certain other of its affiliates for management
services, offset by the expenses incurred for debt service, salaries and other
expenses.
 
     The Company intends to rely primarily on dividends and interest income from
its life insurance subsidiaries in order to make dividend payments to its
shareholders. The payment of dividends by its life insurance subsidiaries is
regulated under various state laws. Under Iowa law, AmerUs Life and Delta Life
may pay dividends only from the earned surplus arising from their respective
businesses and must receive the prior approval of the Iowa Commissioner to pay
any dividend that would exceed certain statutory limitations. The current
statutory limitation is the greater of (i) 10% of the respective company's
policyowners' surplus as of the preceding year end or (ii) the net gain from
operations for the previous calendar year. Iowa law gives the Iowa Commissioner
broad discretion to disapprove requests for dividends in excess of these limits.
Based on these limitations and 1997 results, AmerUs Life and Delta Life would
have been able to pay approximately $58 million and $8 million in dividends in
1998 respectively without obtaining the Iowa Commissioner's approval. The
payment of dividends by American and FBL is regulated under Kansas law, which
has statutory limitations similar to those in place in Iowa. Based on these
limitations and 1997 results, AmVestors' subsidiaries could pay approximately
$15 million in dividends in 1998. On February 26, 1998 AmerUs Life paid the
Company $5 million in dividends. Based upon the cumulative limitations and 1997
results, the Company's subsidiaries could pay an estimated $75 million in
additional dividends in 1998 without obtaining regulatory approval.
 
     On October 23, 1997, the Company entered into a $250 million revolving
credit facility with a syndicate of lenders (the "Bank Credit Facility") to be
used to replace its existing revolving credit facility, to finance the
acquisition of Delta, to finance permitted mergers and acquisitions and for
other general corporate purposes. The Bank Credit Facility is secured by a
pledge of approximately 49.9% of the outstanding common stock of AmerUs Life,
100% of the outstanding common stock of Delta and a $50 million 9% surplus note
payable to the Company by AmerUs Life. As of December 31, 1997, there was an
outstanding loan balance of $250 million under the facility. The Bank Credit
Facility provides for typical events of default and covenants with respect to
the conduct of the business of the Company and its subsidiaries and requires the
maintenance of various financial levels and ratios. Among other covenants, the
Company (a) cannot have a leverage ratio greater than 0.35:1.0 or an interest
coverage ratio less than 2.5:1.0, (b) is prohibited from paying cash dividends
on its common stock in excess of an amount equal to 3% of its consolidated net
worth as of the last day of the preceding fiscal year, and (c) must cause
certain of its subsidiaries, including AmerUs Life and Delta Life, to maintain
certain ratings from A.M. Best and certain levels of adjusted capital and
surplus and risk-based capital.
 
     The Company may from time to time review other potential acquisition
opportunities. The Company anticipates that funding for any such acquisition may
be provided from available cash resources, from debt or equity financing or
stock-for-stock acquisitions. In the future, the Company anticipates that its
liquidity and capital needs will be met through interest and dividends from its
life insurance subsidiaries, accessing the public equity and debt markets
depending upon market conditions, or alternatively from bank financing.
 
     LIFE INSURANCE SUBSIDIARIES
 
     The cash inflows of the Company's life insurance subsidiaries consist
primarily of premium income, deposits to policyowner account balances, income
from investments, sales, maturities and calls of investments and repayments of
investment principal. Cash outflows are primarily related to withdrawals of
policyowner
 
                                       31
<PAGE>   52
 
account balances, investment purchases, payment of policy acquisition costs,
payment of policyowner benefits, income taxes and current operating expenses.
Life insurance companies generally produce a positive cash flow from operations,
as measured by the amount by which cash inflows are adequate to meet benefit
obligations to policyowners and normal operating expenses as they are incurred.
The remaining cash flow is generally used to increase the asset base to provide
funds to meet the need for future policy benefit payments and for writing new
business.
 
     Management anticipates that funds to meet its short-term and long-term
capital expenditures, cash dividends to shareholders and operating cash needs
will come from existing capital and internally generated funds. Management
believes that the current level of cash and available-for-sale and short-term
securities, combined with expected net cash inflows from operations, maturities
of fixed maturity investments, principal payments on mortgage-backed securities
and its insurance products, will be adequate to meet the anticipated short-term
cash obligations of the Company's life insurance subsidiaries.
 
     The Company and its subsidiaries generated cash flows from operating
activities of $224.4 million, $147.6 million and $189.1 million for the years
ended December 31, 1997, 1996 and 1995 respectively. Excess operating cash flows
were primarily used to increase the Company's fixed maturity investment
portfolio.
 
     Matching the investment portfolio maturities to the cash flow demands of
the type of insurance being provided is an important consideration for each type
of life insurance product and annuity. The Company continuously monitors
benefits and surrenders to provide projections of future cash requirements. As
part of this monitoring process, the Company performs cash flow testing of its
assets and liabilities under various scenarios to evaluate the adequacy of
reserves. In developing its investment strategy, the Company establishes a level
of cash and securities which, combined with expected net cash inflows from
operations, maturities of fixed maturity investments and principal payments on
mortgage-backed securities, are believed adequate to meet anticipated short-term
and long-term benefit and expense payment obligations. There can be no assurance
that future experience regarding benefits and surrenders will be similar to
historic experience since withdrawal and surrender levels are influenced by such
factors as the interest rate environment and the claims-paying and financial
strength ratings of the Company's life insurance subsidiaries.
 
     The Company takes into account asset-liability management considerations in
the product development and design process. Contract terms for the Company's
interest-sensitive products include surrender and withdrawal provisions which
mitigate the risk of losses due to early withdrawals. These provisions generally
do one or more of the following: limit the amount of penalty-free withdrawals,
limit the circumstances under which withdrawals are permitted, or assess a
surrender charge or market value adjustment relating to the underlying assets.
The following table summarizes statutory liabilities for interest-sensitive life
products and annuities by their contractual withdrawal provisions at December
31, 1997 (dollars in millions):
 
<TABLE>
<S>                                                             <C>
Not subject to discretionary withdrawal.....................    $  412.9
Subject to discretionary withdrawal with adjustments:
  Specified surrender charges(A)............................     4,546.9
  Market value adjustments..................................     1,319.2
                                                                --------
     Subtotal...............................................     5,866.1
                                                                --------
Subject to discretionary withdrawal without adjustments.....       711.5
                                                                --------
     Total..................................................    $6,990.5
                                                                ========
</TABLE>
 
- - -------------------------
(A) Includes $1,674.3 million of statutory liabilities with a contractual
    surrender charge of less than five percent of the account balance.
 
     Through its membership in the Federal Home Loan Bank ("FHLB") of Des
Moines, AmerUs Life is eligible to borrow on a line of credit available to
provide it with additional liquidity. Interest is payable at a current rate at
the time of any advance. As of December 31, 1997, AmerUs Life had a $25.0
million open secured line of credit against which there were no borrowings. In
addition to the line of credit, AmerUs Life has long-term advances from the FHLB
outstanding of $16.4 million at December 31, 1997.
 
                                       32
<PAGE>   53
 
     The Company's life insurance subsidiaries may also obtain liquidity through
sales of investments or borrowings collateralized by their investment
portfolios. The Company's investment portfolio as of December 31, 1997 had a
carrying value of $8.9 billion, including Closed Block investments. As of
December 31, 1997, fixed maturity securities were $7.9 billion or 88.9% of
invested assets, with public and private fixed maturity securities constituting
$7.5 billion, or 95.4%, and $0.4 billion, or 4.6%, of total fixed maturity
securities, respectively.
 
     At December 31, 1997, the statutory surplus of AmerUs Life, Delta Life,
American and FBL were approximately $325 million, $83 million, $112 million and
$41 million, respectively. The Company believes that these levels of statutory
capital are more than adequate as each life insurance subsidiary's risk-based
capital is significantly in excess of required levels.
 
     In the future, in addition to their cash flows from operations and
borrowing capacity, the life insurance subsidiaries would anticipate obtaining
their required capital from the Company as the Company will have access to the
public debt and equity markets.
 
YEAR 2000 COMPLIANCE
 
     As the year 2000 approaches, an important business issue has emerged
regarding how existing application software programs and operating systems can
accommodate the date value "2000." Many existing application software products
were designed to only accommodate a two digit date position which represents the
year (e.g., the number "95" is stored on the system and represents the year
1995). As a result, the year 1999 (i.e., "99") is the maximum date value many
systems will be able to accurately process. The Company formed a year 2000
working group to address potential problems posed by this development to assure
that the Company is prepared for the year 2000. The Company has already made
significant progress in accomplishing the necessary modifications and
conversions to deal with year 2000 issues and anticipates that the majority of
the required efforts will be completed by the end of 1998. Management does not
anticipate that the Company will incur significant operating expenses or be
required to invest heavily in computer system improvements to address year 2000
issues. Total estimated costs are in a range of $4 to $6 million with
approximately $3 million to be incurred in 1998. However, if modifications and
conversions to deal with year 2000 issues are not completed on a timely basis or
are not fully effective, such issues may have a material adverse effect on the
operations of the Company. All costs associated with year 2000 modifications and
conversions will be expensed as incurred.
 
                                       33
<PAGE>   54
 
                                    BUSINESS
 
OVERVIEW
 
     GENERAL
 
     The Company is an insurance holding company engaged through its
subsidiaries in the business of marketing, underwriting and distributing a broad
range of individual life insurance and annuity products to individuals and
businesses in 49 states, the District of Columbia and the U.S. Virgin Islands.
The Company's primary product offerings consist of whole life, universal life
and term life insurance policies and fixed annuities. As of December 31, 1997,
the Company had approximately 573,000 life insurance policies and annuity
contracts outstanding and individual life insurance in force, net of
reinsurance, of approximately $26.7 billion with life insurance reserves of $2.4
billion and annuity reserves of $6.1 billion. As of December 31, 1997, the
Company had total assets of $10.3 billion and total shareholders' equity of
$928.0 million. In addition, through the Ameritas Joint Venture with Ameritas,
AmerUs Life markets fixed annuities issued by AVLIC and sells AVLIC's variable
life insurance and variable annuity products.
 
     THE COMPANY'S PRINCIPAL SUBSIDIARIES
 
     The Company's principal subsidiaries are AmerUs Life, Delta and AmVestors.
AmerUs Life was originally incorporated in 1896 as a mutual insurance company.
AmerUs Life's target customers are individuals in the middle and upper income
brackets and small businesses. Its geographic focus is national in scope (except
for Connecticut, Maine, New Hampshire, New York and Vermont, in which AmerUs
Life is not licensed to do business), and it primarily serves suburban and rural
areas. Efforts are currently underway to expand AmerUs Life's territory into the
states of Connecticut, Maine, New Hampshire and Vermont. AmerUs Life distributes
its products primarily through a combination of career general agency and PPGA
distribution systems, as well as a network of independent brokers. The career
general agency system consists of a network of 35 career general agencies, with
approximately 570 career agents. The PPGA system is comprised of approximately
425 PPGA's, who have approximately 1,100 agents. As of December 31, 1997, AmerUs
Life had approximately 408,000 life insurance policies and annuity contracts
outstanding and individual life insurance in force, net of reinsurance, of
approximately $26.6 billion. Variable life insurance products and the fixed and
variable annuities offered by the Ameritas Joint Venture are marketed through
AmerUs Life's distribution systems and the distribution systems of Ameritas and
AVLIC, which consist of approximately 160 agents and 540 independent
broker-dealers (with approximately 9,000 registered representatives),
respectively.
 
     The Company made two major acquisitions in 1997. The Company acquired Delta
on October 23 for approximately $165 million in cash and AmVestors on December
19 in a stock exchange valued at approximately $350 million. These acquisitions,
along with the growth of AmerUs Life, increased the Company's assets from $4.4
billion at December 31, 1996 to $10.3 billion at December 31, 1997.
 
     The principal asset of Delta is its wholly-owned subsidiary, Delta Life, an
Iowa domiciled life insurance company. Delta Life is licensed in the District of
Columbia and in all states except New York, and specializes in the sale of
individual single and flexible premium deferred annuities, primarily in the
southeastern, western, southwestern and midwestern regions of the United States.
Sales are made primarily through a network of over 3,300 independent agents.
Delta Life's strategy is to structure its fixed annuity products to appeal to
the conservative retirement saver who is seeking principal preservation and
consistency of earnings. Most of Delta Life's products are innovative in that
they incorporate a fixed contractual management fee. Approximately 58% of
Delta's 1997 direct collected premiums were derived from retirement-oriented
tax-qualified annuities. Delta had direct collected premiums of $192.6 million
in 1997 and as of December 31, 1997 had annuity reserves of $1.8 billion. See
"Reorganization and Recent Acquisitions -- Acquisition of Delta Life
Corporation".
 
     AmVestors' principal operating subsidiaries are American, a Kansas
domiciled life insurance company licensed in 48 states and the District of
Columbia; and FBL, a Kansas domiciled life insurance company doing business in
40 states, the District of Columbia and the U.S. Virgin Islands. AmVestors
specializes in the sale of annuity products, further strengthening the Company's
presence in the rapidly growing asset accumulation
 
                                       34
<PAGE>   55
 
and retirement and savings markets. AmVestors utilizes product features intended
to enhance the potential for profit by encouraging persistency and reducing
premature withdrawal during the first five to fourteen years of an annuity
contract. AmVestors distributes its products through a national network of
approximately 7,800 licensed independent agents recruited through its
wholly-owned subsidiaries, as well as through almost 60 independent marketing
organizations. As of December 31, 1997, AmVestors had approximately 104,000
annuity contracts outstanding. AmVestors had direct collected premiums of $583.4
million in 1997 and as of December 31, 1997 had annuity reserves of $3.1
billion. See "Reorganization and Recent Acquisitions -- Acquisition of AmVestors
Financial Corporation."
 
     AMERITAS JOINT VENTURE
 
     On April 1, 1996 the Company commenced the Ameritas Joint Venture with
Ameritas. The Company participates in the Ameritas Joint Venture through AmerUs
Life's 34% ownership interest in AMAL. AMAL's operations are conducted through
AVLIC and Ameritas Investment Corp. ("AIC"), its two wholly-owned subsidiaries,
which have been in business since 1983. AVLIC is licensed to conduct business in
46 states and the District of Columbia. AIC is a registered broker-dealer which
is licensed to do business in all states except New York. As of December 31,
1997, AMAL had total consolidated assets of $1.5 billion and total consolidated
shareholder's equity of $72.0 million on a GAAP basis. AVLIC had $3.8 billion of
insurance in force and $45.3 million in surplus as of December 31, 1997, on a
statutory basis. AmerUs Life's partner in the Ameritas Joint Venture, Ameritas,
is a Nebraska life insurance company which has been in existence for more than
100 years. The distribution systems of Ameritas and AVLIC consist of
approximately 160 agents and 540 independent broker-dealers with approximately
9,000 registered representatives. On a statutory basis, Ameritas had $1.9
billion in assets, $8.2 billion of insurance in force and $311.3 million in
surplus as of December 31, 1997.
 
     AmerUs Life's investment in the Ameritas Joint Venture affords AmerUs Life
access to a line of existing variable life insurance and annuity products.
AmerUs Life and Ameritas have equal membership on the board of directors of
AMAL, AVLIC and AIC. The Company and Ameritas each have guaranteed the
obligations of AVLIC. The guarantee of each party is joint and several, and will
remain in effect until certain financial conditions are met. Under the terms of
the Joint Venture Agreement, AmerUs Life has an option to purchase an additional
5% to 15% of AMAL if certain premium growth targets are met.
 
STRATEGY
 
     The business strategy of the Company is to focus on providing individual
retail consumers in the United States with superior financial services and
products that will meet their financial planning, risk protection, and asset
accumulation needs. Target markets of the Company include individuals in the
middle and upper income brackets and small businesses. Its geographic focus is
national in scope (except for New York, in which the Company is not licensed to
do business), and it primarily serves suburban and rural areas.
 
     The Company seeks to effect this strategy by focusing on life insurance and
asset accumulation products distributed through a variety of distribution
systems. In particular, the Company has developed a very strong position in the
distribution of fixed annuities through independent agents and has a long
established reputation as a provider of whole life insurance products,
distributed through career and PPGA agency distribution systems, that are among
the most attractively priced products to consumers in the industry.
 
     The Company's strategy emphasizes effective management of certain operating
fundamentals -- mortality, expenses, persistency and investment results -- where
the Company's results have historically compared favorably to the industry. The
Company's operating strengths have enabled it to provide attractively priced
products to consumers while also generating profitability for its shareholders.
 
     Growth through a combination of internal growth and mergers, acquisitions
and strategic alliances is a key element of the Company's strategy. In the life
insurance market, the Company presently has only 0.3% of new life insurance
sales nationwide, which provides substantial opportunity for increased growth
through improved marketing and sales execution even in a generally flat business
environment.
 
                                       35
<PAGE>   56
 
     In the fixed annuity area, the Company is presently a leader in the
distribution of fixed annuities through independent agents. Independent agents
have increased their share of fixed annuity sales in recent years and the
Company's goal is to consistently rank among the top 3 to 5 providers in this
segment.
 
     The Company continues to seek to both deepen and diversify its distribution
channels. Primarily as a result of the acquisitions of AmVestors and Delta, the
Company's distribution channels have grown significantly in recent years. As of
December 31, 1997, the Company had over 15,000 distributors as compared to
approximately 3,700 distributed as of December 31, 1996. While continuing to
expand its existing channels, the Company is in the process of developing
additional bank and major independent marketing organization distribution
channels.
 
     The Company believes it is well positioned to compete effectively based
upon a number of strengths including its strong operating performance,
customer-driven product offerings, productive and diversified distribution
systems, sophisticated asset-liability management capabilities and a customer
service orientation. In addition, the Company will continue to seek new business
opportunities through mergers, acquisitions and strategic alliances.
 
INTEGRATION OF RECENTLY ACQUIRED SUBSIDIARIES
 
     The Company made two major acquisitions in 1997, acquiring Delta on October
13, 1997 for approximately $165 million in cash and AmVestors on December 19,
1997 in a stock exchange valued at approximately $350 million. These
acquisitions, along with the growth of AmerUs Life, increased the Company's
assets from $4.4 billion at December 31, 1996 to $10.3 billion at December 31,
1997.
 
     The Company believes it has been successful in completing its integration
plans in respect of both Delta and AmVestors. The operations of Delta have been
integrated with those of AmerUs Life and the investment operations of AmVestors
have been merged with the investment management operations of the Company.
 
     Delta's operations have been integrated with AmerUs Life's operations
except for Delta's marketing, sales management and customer services functions
and the distribution system which will remain separate. Delta's offices in
Memphis, Tennessee have been closed and all of Delta's operations have been
relocated to AmerUs Life's facilities in Des Moines, Iowa. By integrating most
of Delta's operations with those of AmerUs Life, Delta has reduced the number of
employees by over 50%, and the Company currently projects that general insurance
and investment expenses of Delta, before deferrals, will be reduced by
approximately 48% or $10 million on an annualized basis following integration of
operations with AmerUs Life at the end of March, 1998. The Company believes that
additional expense reductions will be attainable as AmerUs Life's technology
enhancements, such as imaging, are applied to Delta Life's operations.
 
     The investment operations of AmVestors have been merged with those of the
Company. In addition, the Company intends to move towards the use of common
administrative systems and platforms for all of its annuity businesses. While
various other functions are also likely to be integrated (e.g. audit;
asset-liability management and some product development) the Company intends to
maintain AmVestors as a separate administrative as well as marketing and sales
entity. Savings from elimination of public company costs and reductions in
management personnel, when added to savings from integration of AmVestors'
investment operations with those of AmerUs, have produced initial savings
consistent with original expectations. Other staff reductions at AmVestors
completed during the first quarter of 1998 will probably produce savings in 1998
in excess of those anticipated at the time of the transactions. While AmVestors'
operations will be maintained, expense savings relating to the AmVestors
Acquisition are expected to exceed original expectations. Continued growth in
1999 and beyond should allow the estimated cost savings projected for later
years to be realized without the need for a potentially disruptive back office
integration.
 
PRODUCTS
 
     GENERAL
 
     The Company offers a diverse line of individual life insurance products
which are tailored to its markets. In addition, the Company recently acquired
Delta and AmVestors, through which it now offers additional
                                       36
<PAGE>   57
 
annuity products. The Company also is a party to the Ameritas Joint Venture,
which offers fixed and variable annuity and variable life insurance products. As
a result of superior operating fundamentals, including mortality, persistency,
operating expenses and investment yield, the Company has had a long history of
providing high-value, low-cost products to its customers, while operating
profitably. Moreover, the Company continuously reviews and updates its product
portfolio in order to continue offering a broad range of products at competitive
performance levels.
 
     The pricing of the Company's products is generally determined by reference
to actuarial calculations and statistical assumptions principally relating to
mortality, persistency, investment yield assumptions, estimates of expenses and
management's judgment as to market and competitive conditions. The premiums and
deposits received, together with assumed investment earnings, are designed to
cover policy benefits, expenses and policyowner dividends plus return a profit
to the Company. These profits arise from the margin between mortality charges
and insurance benefits paid, the margin between actual investment results and
the investment income credited to policies (either directly or through dividends
to policyowners) and the margin between expense charges and actual expenses. The
level of profits also depends on persistency because business acquisition costs,
particularly agent commissions, are recovered over the life of the policy.
Dividends and interest credited on policies (including policies included in the
Closed Block) may vary from time to time reflecting changes in investment,
mortality, persistency, expenses and other factors. Interest rate fluctuations
have an effect on investment income and may have an impact on policyowner
behavior. Increased lapses in policies may be experienced if the Company does
not maintain interest rates and dividend scales that are competitive with other
products in the marketplace.
 
     AMERUS LIFE PRODUCTS
 
     Traditional life insurance and universal life insurance have accounted for
approximately 70% and 30%, respectively, of AmerUs Life's total individual life
insurance premiums over the last three years. In addition, AmerUs Life has
historically offered a broad line of fixed annuity products.
 
     TRADITIONAL LIFE INSURANCE PRODUCTS. AmerUs Life's traditional life
insurance products have a long history of being highly competitive within the
industry. Traditional life insurance products include participating whole life
and term life insurance products. Participating whole life insurance is designed
to provide benefits for the life of the insured. This product generally provides
for level premiums and a level death benefit and requires payments in excess of
the mortality cost in earlier years to offset increasing mortality costs in
later years. AmerUs Life also offers a second to die whole life insurance
product which insures two lives and provides benefits upon the death of the
second insured. AmerUs Life targets its second to die products primarily to
potential customers seeking to achieve estate planning goals.
 
     AmerUs Life also offers a portfolio of term insurance policies that provide
life insurance protection for a specific time period (which generally can be
renewed at an increased premium). Such policies are mortality-based and offer no
cash accumulation feature. Term life insurance is a highly competitive and
quickly changing market. During 1997, AmerUs Life introduced new 10 and 20 year
term products. As a result, AmerUs Life's first year annualized premiums for
term insurance sales increased by 85% from 1996 to 1997.
 
     Since 1989, AmerUs Life has offered a flexible life insurance product which
is a combination of permanent participating whole life insurance, increasing
paid-up additions and decreasing term insurance coverage. These products give
policyowners additional flexibility in designing an appropriate combination of
permanent and term life insurance coverages to meet their specific needs at
varying premium levels.
 
     For the year ended December 31, 1997, sales of participating whole life and
term life insurance products represented 55% and 16%, respectively, of first
year annualized premiums for all individual life insurance products sold by
AmerUs Life.
 
     UNIVERSAL LIFE INSURANCE PRODUCTS. AmerUs Life offers universal life
insurance products, pursuant to which an insurance account is maintained for
each insurance policy. Premiums, net of specified expenses, are credited to the
account, as is interest, generally at a rate determined from time to time by
AmerUs Life. Specific charges are made against the account for the cost of
insurance and for expenses. The universal life
 
                                       37
<PAGE>   58
 
policy provides flexibility as to the amount and timing of premium payments and
the level of death benefits provided.
 
     AmerUs Life's universal life insurance products provide benefits for the
life of the insured. Within limits established by AmerUs Life and state
regulations, policyowners may vary the premiums and the amount of the policy's
death benefit as long as there are sufficient policy funds available to cover
all policy charges for the coming period. Interest is credited to the policy at
a rate determined from time to time by AmerUs Life. During 1997, AmerUs Life
introduced a new second to die universal life product for the estate planning
market, enhancing universal life production for the year. The weighted average
crediting rate for AmerUs Life's universal life insurance liabilities was 6.23%
for the year 1997, 6.27% for the year 1996 and 6.46% for the year 1995. For the
year ended December 31, 1997, sales of universal life insurance products
represented 29% of first year annualized premiums for all individual life
insurance products sold by AmerUs Life.
 
     FIXED ANNUITY PRODUCTS. Historically, AmerUs Life has offered a broad
portfolio of fixed annuity products. Annuities provide for the payment of
periodic benefits over a specified time period. Benefits may commence
immediately or may be deferred to a future date. Fixed annuities generally are
backed by a general investment account and credited with a rate of return that
is periodically reset.
 
     Since the formation of the Ameritas Joint Venture in May 1996,
substantially all individual deferred annuity sales by AmerUs Life's
distribution systems are made through the Ameritas Joint Venture, resulting in a
significant decline in the sale of such products by AmerUs Life. However, AmerUs
Life retained the right to continue to issue replacement business to its fixed
annuity customers in existence prior to the effective date of the Joint Venture
Agreement.
 
     DELTA PRODUCTS
 
     Delta specializes in the sale of deferred fixed and equity index annuities
to individuals. Delta's product offerings differ from those of many of its
competitors in two ways. First, Delta offers an interest rate crediting strategy
on almost all of its single and flexible premium deferred annuities that credits
the policy with a return generally based upon the interest rates it earns on
assets supporting the respective policies less contractual management fees. In
addition, these policies offer a lifetime guaranteed minimum interest crediting
rate and an annual guaranteed interest crediting rate. Second, Delta's current
investment policy provides for no less than 70% of policyowners' assets be
invested in securities issued, secured or guaranteed by the U.S. Government,
government agencies or government instrumentalities. The balance of these funds
is invested primarily in investment grade corporate bonds and commercial
mortgages.
 
     In 1996 and 1997 Delta introduced and commenced marketing two single
premium equity index annuity products that are based either on Standard & Poor's
500 Composite Stock Price Index(TM), or a basket of five international stock
market indices from France, Germany, Japan, Switzerland and the United Kingdom.
Earnings credited to these products are linked to increases in the anniversary
date values of the applicable index, less management fees. The policyowner is
guaranteed to receive at least 110% of the original premium at the end of the
seven year term of the policy, assuming no withdrawals.
 
     AMVESTORS PRODUCTS
 
     AmVestors specializes in the sale of fixed deferred annuity products to
individuals. During each of the past three years, sales of deferred annuities
have accounted for approximately 97% of AmVestors' premiums received, while
sales of single premium immediate annuities and flexible premium universal life
insurance have accounted for virtually all remaining premiums received. As of
December 31, 1997, AmVestors had total annuity reserves of $3.1 billion.
 
     AmVestors' deferred annuities have an initial credited interest rate
guaranteed for a period of one to five years. Following the initial guarantee
period, AmVestors may adjust the credited interest rate annually, subject to the
guaranteed minimum interest rates specified in the contracts. Such minimum
guaranteed rates currently range from 3% to 6%.
 
                                       38
<PAGE>   59
 
     AmVestors designs its products and directs its marketing efforts towards
the savings and retirement market. Historically, the 50 and older age group has
accounted for over 86% of all annuity premiums received by AmVestors. AmVestors
continues to target this age group because management believes that as this
group ages, it will have an increasing interest in saving for retirement,
nursing home care and unanticipated medical costs. The portfolio of products is
continuously reviewed with new plans added and others discontinued in an effort
to remain competitive.
 
     AMERITAS JOINT VENTURE PRODUCTS
 
     The Ameritas Joint Venture offers fixed annuity products which are
substantially similar to those previously marketed by AmerUs Life. In addition,
the Ameritas Joint Venture offers, through AVLIC, flexible premium and single
premium variable universal life insurance products and variable annuities.
Variable products provide for allocation of funds to a general account or to one
or more separate accounts under which the owner bears the investment risk.
Through AVLIC's fund managers, owners of variable annuities and life insurance
policies are able to choose from a range of investment funds offered by each
manager.
 
     Under the terms of the Joint Venture Agreement governing the Ameritas Joint
Venture, AmerUs Life and Ameritas write their new single and flexible premium
deferred fixed annuities and variable annuities and variable life insurance
through the Ameritas Joint Venture. AmerUs Life has retained the right to
continue to issue replacement business to its fixed annuity customers in
existence prior to the effective date of the Joint Venture Agreement.
 
     The variable life insurance products and the fixed and variable annuities
offered by the Ameritas Joint Venture are distributed through AmerUs Life's
career general agency and PPGA distribution systems, as well as through the
distribution systems of Ameritas and AVLIC.
 
     In response to customer demand, AmerUs Life developed an equity index
annuity which it began offering through the Ameritas Joint Venture in the fourth
quarter of 1996. An equity index annuity provides a minimum baseline fixed rate
of return in addition to sharing in a portion of the appreciation realized from
an investment in an indexed investment fund, such as the S&P 500 stock index.
AmerUs Life retained the right to issue this type of contract to certain of its
customers in existence prior to the effective date of the Joint Venture
Agreement and through certain other distribution systems. Sales of such products
amounted to 15% of AmerUs Life's total fixed annuity production in 1997.
 
DISTRIBUTION SYSTEMS
 
     AMERUS LIFE
 
     AmerUs Life markets its insurance products on a national basis primarily
through a career general agency system, a PPGA system, independent insurance
brokers and certain of AmerUs Life's affiliates. AmerUs Life currently employs
ten regional vice presidents who are responsible for supervising the career
general agencies and/or PPGA agents within their assigned geographic regions.
 
     CAREER GENERAL AGENCY SYSTEM AND BROKERS.  Under the career general agency
system, AmerUs Life enters into a contractual arrangement with the career
general agent for the sale of insurance products by the career agents and
brokers assigned to the career general agent's agency. The career general agents
are primarily compensated by receiving a percentage of the first year
commissions paid to career agents and brokers in the career general agent's
agency and by renewal commissions on premiums subsequently collected on that
business.
 
     The career general agents are independent contractors and are generally
responsible for the expenses of operating their agencies, including office and
overhead expenses and the recruiting, selection, contracting, training and
development of career agents and brokers in their agency. Currently, AmerUs Life
has 35 career general agents in 23 states, through which approximately 570
career agents sell AmerUs Life's products. While career agents in the career
general agency system are non-exclusive, AmerUs Life believes most agents use
AmerUs Life's products for a majority of their new business of the type of
products offered by AmerUs
                                       39
<PAGE>   60
 
Life. No single career general agency accounts for more than 10% of the total
first year commissions paid by AmerUs Life.
 
     Career agents are also independent contractors and are primarily
compensated by commissions on first year and renewal premiums collected on
business written by them. In addition, career agents can earn bonus commissions,
graded by production and persistency on their business.
 
     AmerUs Life also sells its products through a network of approximately
1,900 insurance brokers in all jurisdictions in which AmerUs Life is licensed to
sell insurance. Brokers are independent contractors who sell a variety of
insurance products issued by various companies. Brokers operate through the
career general agency system but are compensated under a commission structure
which is separate from those used for career agents and in the PPGA system.
 
     PERSONAL PRODUCING GENERAL AGENCY SYSTEM.  Under the PPGA system, AmerUs
Life contracts primarily with individuals who are experienced individual agents
or head a small group of experienced individual agents. These individuals are
independent contractors and are responsible for all of their own expenses. These
individuals often sell products for other insurance companies, and may offer
selected products of AmerUs Life rather than AmerUs Life's full line of
insurance products. The PPGA system is comprised of approximately 425 PPGA's,
with approximately 1,100 agents.
 
     PPGA's are compensated by commissions on first year and renewal premiums
collected on business written by themselves and the agents in their units. In
addition to a base commission, PPGA's may earn bonus commissions on their
business, graded by production and persistency.
 
     DELTA
 
     Delta's annuity products are sold through independent agents who are
supervised by regional vice presidents and regional directors with specified
geographic supervisory responsibilities. The regional vice presidents and
regional directors are primarily responsible for recruiting agents and providing
marketing support to those agents in an effort to promote Delta's products. The
regional vice presidents' and regional directors' marketing support activities
include informational mailings, seminars, and case consultations, all of which
are designed to educate agents about annuities in general and Delta in
particular. Regional vice presidents and regional directors are paid a base
salary plus incentive compensation based on the business produced by agents
within their territory. There are currently ten regional vice presidents and
regional directors.
 
     The regional vice presidents and regional directors are responsible for
over 3,300 licensed, independent agents, who may also sell insurance products
for other companies. Of these agents, approximately 1,400 wrote annuity business
for Delta in 1997. No single agent was responsible for more than 1.6% of Delta's
1997 annuity premiums. No significant amount of Delta's business is produced by
stock brokerage firms, banks or large national insurance brokerage agencies.
 
     AMVESTORS
 
     AmVestors endeavors to attract agents to sell its products by offering a
broad selection of fixed annuity products and by providing timely, comprehensive
services to agents and customers. AmVestors markets its products through
independent agents. AmVestors currently has approximately 7,800 independent
agents licensed to sell its products. AmVestors also maintains contact with
approximately 50,000 agents that are not currently licensed, but have either
sold the AmVestors' annuities in the past or have expressed an interest in doing
so. These agents continue to receive periodic mailings related to interest rate
and commission changes, and new product introductions, and are reappointed as
required in order to represent AmVestors in selling its products. However, in
order to save costs associated with reappointing agents, AmVestors does not
automatically relicense an agent that has not written business for twelve
months.
 
     No single agent accounted for more than 1.2% of American's annuity sales in
1997, and no single agent accounted for more than 3.0% of FBL's annuity sales in
1997. AmVestors does not have exclusive agency
 
                                       40
<PAGE>   61
 
agreements with its agents and management believes most of these agents sell
products for other insurance companies similar to those sold by American and
FBL.
 
INVESTMENT PORTFOLIO
 
     GENERAL
 
     The Company maintains a diversified portfolio of investments which is
supervised by an experienced in-house staff of investment professionals. The
Company employs sophisticated asset management techniques in order to achieve
competitive yields, while maintaining risk at acceptable levels. The asset
portfolio is segmented by liability type, with tailored investment strategies
for specific product lines. Investment policies and significant individual
investments are subject to approval by the Board of Directors of each of the
life insurance companies and are overseen by the Investment Committee of the
Board of Directors of the Company. Management regularly monitors individual
assets and asset groups, in addition to monitoring the overall asset mix. In
addition, the insurance company boards and the Investment Committee review
investment guidelines and monitor internal controls.
 
     INVESTMENT STRATEGY
 
     The Company's investment philosophy is to employ an integrated
asset-liability management approach with separate investment portfolios for
specific product lines, such as traditional life, universal life and annuities
to generate attractive risk-adjusted returns on capital. Essential to this
philosophy is coordinating investments in the investment portfolio with product
strategies, focusing on risk-adjusted returns and identifying and evaluating
associated business risks.
 
     The Company's asset-liability management approach utilizes separate
investment portfolios for specific product lines, such as traditional life,
universal life and annuities. Investment policies and strategies have been
established based on the specific characteristics of each product line. The
portfolio investment policies and strategies establish asset duration, quality
and other guidelines. The Company utilizes analytical systems to establish an
optimal asset mix for each line of business. The Company seeks to manage the
asset-liability mismatch and the associated interest rate risk through active
management of the investment portfolio. Financial, actuarial, investment,
product development and product marketing professionals work together throughout
the product development, introduction and management phases to jointly develop
and implement product features, initial and renewal crediting strategies, and
investment strategies based on extensive modeling of a variety of factors under
a number of interest rate scenarios.
 
     INVESTED ASSETS
 
     The Company maintains a diversified portfolio of investments, including
public and private fixed maturity securities, commercial mortgage loans and
equity real estate. The Company's objective is to maintain a high-quality,
diversified fixed maturity securities portfolio that produces a yield and total
return that supports the various product line liabilities and the Company's
earnings goals.
 
     FIXED MATURITY SECURITIES
 
     The fixed maturity securities portfolio consists primarily of investment
grade corporate fixed maturity securities, high-quality MBS and United States
government and agency obligations. As of December 31, 1997 fixed maturity
securities were $7,927.5 million, or 88.9% of the carrying value of invested
assets with public and private fixed maturity securities constituting $7,561.9
million, or 95.4%, and $365.6 million, or 4.6%, of total fixed maturity
securities, respectively.
 
     The Company's portfolio of investment grade fixed maturity securities is
diversified by number and type of issuer. As of December 31, 1997, investment
grade fixed maturity securities included the securities of over 617 issuers,
with 2,222 different issues of securities. No issuer represents more than 2.8%
of investment grade fixed maturity securities.
 
                                       41
<PAGE>   62
 
     Below-investment grade fixed maturity securities as of December 31, 1997
represented 4.6% of total invested assets, with the largest being a $10.6
million investment.
 
     As of December 31, 1997, 88.7% of total invested assets were investment
grade fixed maturity securities.
 
     Mortgage backed securities ("MBS") comprise a core position within the
Company's fixed maturity securities investments. MBS investments include
residential, commercial MBS, home equity loans (including home equity loans
purchased from one of the Company's affiliates), manufactured housing, FHA Title
I and CMBS. Residential mortgage pass-throughs and collateralized mortgage
obligations ("CMOs") total $2,794.9 million or 31.8% of total invested assets.
As of December 31, 1997, MBS were $3,450.3 million or 38.7%, of total invested
assets. MBS guaranteed by the United States government or an agency of the
United States government were $2,793.6 million, or 81.0% of MBS, and other MBS
were $656.7 million, or 19.0%, of MBS as of December 31, 1997. At December 31,
1997 the Company's MBS investment portfolio composition was approximately 54%
fixed rate pass-throughs backed by seasoned loan pools, 5% floating rate
pass-throughs and 41% CMOs with some form of explicit prepayment protection. The
Company has established specific investment guidelines for the management of
MBS. As a general policy, the Company does not invest in interest-only and
principal-only or other similar leveraged derivative mortgage instruments.
Management believes that the quality of assets in the MBS portfolio is generally
high, with 91.7% of such assets representing agency backed or "AAA" rated
securities.
 
     The Company uses interest rate swaps and caps to reduce its exposure to
changes in interest rates and to manage duration mismatches. Although the
Company is subject to the risk that counterparties will fail to perform, credit
standings of counterparties are monitored regularly. The Company's policy is to
contract only with counterparties that are rated "AA" or higher; accordingly, it
is expected that counterparties will be able to satisfy their obligations under
such contracts. The Company is also subject to the risk associated with changes
in the value of contracts. However, such adverse changes in value generally are
offset by changes in the value of the items being hedged. The notional principal
amounts of the swaps and caps, which represent the extent of the Company's
involvement in such contracts but not the risk of loss, at December 31, 1997,
amounted to $1,100.2 million. The swaps had no carrying value at December 31,
1997 and a fair value which amounted to a net payable position of $0.1 million
at December 31, 1997. The carrying value and fair value of interest rate caps
and swaptions amounted to $2.1 million and $2.0 million, respectively, and are
reflected as "other investments" on the Company's consolidated financial
statements as of December 31, 1997. The net amount payable or receivable from
interest rate swaps and caps is accrued as an adjustment to interest income.
 
     MORTGAGE LOANS
 
     As of December 31, 1997, mortgage loans in the Company's investment
portfolio were $462.5 million, or 5.2% of the aggregate carrying value of
invested assets, including the Closed Block. As of December 31, 1997, commercial
mortgage loans and residential mortgage loans comprised 96.4% and 3.6%,
respectively, of the mortgage loans in the Company's investment portfolio.
 
     Commercial mortgage loans consist primarily of fixed-rate mortgage loans.
As of December 31, 1997, the Company held 435 individual commercial mortgage
loans with an average balance of $1.1 million.
 
     As of December 31, 1997, only five loans aggregating $2.0 million, or 0.4%,
of the Company's loan portfolio (as measured by principal balance) were
classified as delinquent or in foreclosure. As of the same date, only $4.4
million, or 0.9%, of the Company's loan portfolio (as measured by principal
balance) was classified as restructured. During 1997, the Company had no
foreclosures.
 
     EQUITY REAL ESTATE
 
     In recent years the Company has significantly reduced its equity real
estate portfolio. As of December 31, 1997, the carrying value of investment real
estate, including the Closed Block, was $8.7 million.
 
                                       42
<PAGE>   63
 
     OTHER
 
     The Company held $286.2 million of policy loans on individual insurance and
annuity products as of December 31, 1997. Policy loans are permitted to the
extent of a policy's contractual limits and are fully collateralized by policy
cash values.
 
     As of December 31, 1997, the Company held equity securities of $61.5
million. The largest holding of equity securities, Federal Home Loan Bank, had a
carrying value of $28.1 million as of December 31, 1997.
 
     The Company held $172.0 million of other invested assets (including
short-term investments) on December 31, 1997. Other invested assets consist
primarily of various joint venture and limited partnership investments.
 
                         DESCRIPTION OF DEBT SECURITIES
 
     The Debt Securities offered hereby, consisting of notes, debentures and
other evidences of indebtedness, are to be issued in one or more series
constituting either senior Debt Securities ("Senior Debt Securities") or junior
subordinated Debt Securities ("Junior Subordinated Debt"). Unless otherwise
specified in the applicable Prospectus Supplement, the Debt Securities will be
issued pursuant to indentures described below (as applicable, the "Senior
Indenture" or the "Subordinated Indenture", each, an "Indenture" and, together,
the "Indentures"), in each case between the Company and the trustee identified
therein (each an "Indenture Trustee"), the forms of which have been filed as
exhibits to the Registration Statement of which this Prospectus forms a part.
Except as provided in the applicable Prospectus Supplement and except for the
subordination provisions of the Subordinated Indenture, for which there are no
counterparts in the Senior Indenture, the provisions of the Subordinated
Indenture are substantively identical to the provisions of the Senior Indenture
that bear the same section numbers.
 
     The statements herein relating to the Debt Securities and the following
summaries of certain general provisions of the Indentures do not purport to be
complete and are subject to, and are qualified in their entirety by reference
to, all the provisions of the Indentures (as they may be amended or supplemented
from time to time), including the definitions therein of certain terms
capitalized in this Prospectus. All article and section references appearing
herein are to articles and sections of the applicable Indenture and whenever
particular Sections or defined terms of the Indentures (as they may be amended
or supplemented from time to time) are referred to herein or in a Prospectus
Supplement, such Sections or defined terms are incorporated herein or therein by
reference.
 
     GENERAL
 
     The Debt Securities will be unsecured obligations of the Company. The
Indentures do not limit the aggregate amount of Debt Securities which may be
issued thereunder, nor do they limit the incurrence or issuance of other secured
or unsecured debt of the Company. The Debt Securities issued under the Senior
Indenture will be unsecured and will rank pari passu in right of payment with
all other unsecured and unsubordinated debt obligations of the Company. The Debt
Securities issued under the Subordinated Indenture will be subordinate and
junior in right of payment, to the extent and in the manner set forth in the
Subordinated Indenture, to all Senior Indebtedness of the Company. See "--
Subordination under the Subordinated Indenture."
 
     Reference is made to the applicable Prospectus Supplement which will
accompany this Prospectus for a description of the specific series of Debt
Securities being offered thereby, including, but not limited to, the following:
(1) the title of such Debt Securities, including whether the Debt Securities are
Senior Debt Securities or Junior Subordinated Debt and whether such Debt
Securities will be issued under the Senior Indenture, the Subordinated Indenture
or another indenture set forth in the Prospectus Supplement; (2) any limit upon
the aggregate principal amount of such Debt Securities; (3) the date or dates on
which the principal of and premium, if any, on such Debt Securities will mature
or the method of determining such date or dates; (4) the rate or rates (which
may be fixed or variable) at which such Debt Securities will bear interest, if
any, or the method of calculating such rate or rates; (5) the date or dates from
which interest, if any, will accrue or the method by which such date or dates
will be determined; (6) the date or dates on which
 
                                       43
<PAGE>   64
 
interest, if any, will be payable and the record date or dates therefor; (7) the
place or places where principal of, premium, if any, and interest, if any, on
such Debt Securities will be payable; (8) with respect to Junior Subordinated
Debt Securities, the right, if any, of the Company to defer payment of interest
on such Debt Securities, the maximum length of any such deferral period and any
related terms, conditions or covenants; (9) the period or periods within which,
the price or prices at which, the currency or currencies (including currency
unit or units) in which, and the terms and conditions upon which, such Debt
Securities may be redeemed, in whole or in part, at the option of the Company;
(10) the obligation, if any, of the Company to redeem or purchase such Debt
Securities pursuant to any sinking fund or analogous provisions or upon the
happening of a specified event and the period or periods within which, the price
or prices at which and the other terms and conditions upon which, such Debt
Securities shall be redeemed or purchased, in whole or in part, pursuant to such
obligations; (11) the denominations in which such Debt Securities are authorized
to be issued if other than $1,000 and any integral multiple thereof, in the case
of registered Debt Securities and if other than $5,000 and any integral multiple
thereof, in the case of bearer Debt Securities; (12) if other than Dollars, the
currency or currencies (including currency units) in which Debt Securities may
be denominated and/or the currency or currencies (including currency units) in
which principal of, premium, if any, and interest, if any, on such Debt
Securities will be payable and whether the Company or the holders of any such
Debt Securities may elect to receive payments in respect of such Debt Securities
in a currency or currency unit other than that in which such Debt Securities are
stated to be payable; (13) if other than the principal amount thereof, the
portion of the principal amount of such Debt Securities which will be payable
upon declaration of the acceleration of the maturity thereof or the method by
which such portion shall be determined; (14) the person to whom any interest on
any such Debt Security shall be payable if other than the person in whose name
such Debt Security is registered on the applicable record date; (15) any
addition to, or modification or deletion of, any Event of Default or any
covenant of the Company specified in the Indenture with respect to such Debt
Securities; (16) the application, if any, of such means of defeasance or
covenant defeasance as may be specified for such Debt Securities; (17) whether
such Debt Securities are to be issued in whole or in part in the form of one or
more temporary or permanent global securities and, if so, the identity of the
depositary for such global security or securities; (18) under what
circumstances, if any, the Company will pay additional amounts on the Debt
Securities of that series held by a Person who is not a U.S. Person in respect
of taxes or similar charges withheld or deducted ("Additional Amounts") and, if
so, whether the Company will have the option to redeem such Debt Securities
rather than pay such Additional Amounts (and the terms of any such option); (18)
if the amount of payments of principal of, premium, if any, and interest, if any
shall be determined by reference to an index, formula or other method, the
index, formula, or other method by which such amounts shall be determinable;
(19) if the principal amount payable at stated maturity will not be determinable
as of any one or more dates prior to the stated maturity, the amount which shall
be deemed to be the principal amount thereof as of any date for any purpose;
(20) whether such Debt Securities shall be Registered or Bearer or both and any
restrictions as to the offering, sale, delivery or exchange of Bearer
Securities; (21) the forms of the Debt Securities and coupons, if any; and (22)
any other special terms pertaining to such Debt Securities. Unless otherwise
specified in the applicable Prospectus Supplement, the Debt Securities will not
be listed on any securities exchange. (Section 3.01.)
 
     Unless otherwise specified in the applicable Prospectus Supplement, Debt
Securities will be issued in fully-registered form without coupons. Where Debt
Securities of any series are issued in bearer form, the special restrictions and
considerations, including special offering restrictions and special Federal
income tax considerations, applicable to any such Debt Securities and to payment
on and transfer and exchange of such Debt Securities will be described in the
applicable Prospectus Supplement. Bearer Debt Securities will be transferable by
delivery. (Section 3.05.)
 
     Debt Securities may be sold at a substantial discount below their stated
principal amount, bearing no interest or interest at a rate which at the time of
issuance is below market rates. Certain Federal income tax consequences and
special considerations applicable to any such Debt Securities, or to Debt
Securities issued at par that are treated as having been issued at a discount,
will be described in the applicable Prospectus Supplement.
 
                                       44
<PAGE>   65
 
     If the purchase price of any of the Debt Securities is payable in one or
more foreign currencies or currency units or if any Debt Securities are
denominated in one or more foreign currencies or currency units or if the
principal of, premium, if any, or interest, if any, on any Debt Securities is
payable in one or more foreign currencies or currency units, or by reference to
commodity prices, equity indices or other factors, the restrictions, elections,
certain Federal income tax considerations, specific terms and other information
with respect to such issue of Debt Securities and such foreign currency or
currency units or commodity prices, equity indices or other factors will be set
forth in the applicable Prospectus Supplement. In general, holders of such
series of Debt Securities may receive a principal amount on any principal
payment date, or a payment of premium, if any, on any premium interest payment
date or a payment of interest on any interest payment date, that is greater than
or less than the amount of principal, premium, if any, or interest otherwise
payable on such dates, depending on the value on such dates of the applicable
currency, commodity, equity index or other factor.
 
PAYMENT, REGISTRATION, TRANSFER AND EXCHANGE
 
     Unless otherwise provided in the applicable Prospectus Supplement, payments
in respect of the Debt Securities will be made in the designated currency at the
office or agency of the Company maintained for that purpose as the Company may
designate from time to time. (Section 9.02.) Unless otherwise indicated in the
applicable Prospectus Supplement, payment of any installment of interest on Debt
Securities in registered form will be made to the person in whose name such Debt
Security is registered at the close of business on the regular record date for
such interest. (Section 3.07 (a).)
 
     Payment in respect of Debt Securities in bearer form will be made in the
currency and in the manner designated in the applicable Prospectus Supplement,
subject to any applicable laws and regulations, at such paying agencies outside
the United States as the Company may appoint from time to time. The paying
agents outside the United States initially appointed by the Company for a series
of Debt Securities will be named in the Prospectus Supplement. The Company may
at any time designate additional paying agents or rescind the designation of any
paying agents, except that, if Debt Securities of a series are issuable as
Registered Securities, the Company will be required to maintain at least one
paying agent in each Place of Payment for such series and, if Debt Securities of
a series are issuable as Bearer Securities, the Company will be required to
maintain a paying agent in a Place of Payment outside the United States where
Debt Securities of such series and any coupons appertaining thereto may be
presented and surrendered for payment. (Section 9.02.)
 
     Unless otherwise provided in the applicable Prospectus Supplement, Debt
Securities in registered form will be transferable or exchangeable at the agency
of the Company maintained for such purpose as designated by the Company from
time to time. (Sections 3.05 and 9.02.) Debt Securities may be transferred or
exchanged without service charge, other than any tax or other governmental
charge imposed in connection therewith. (Section 3.05.)
 
GLOBAL DEBT SECURITIES
 
     Unless otherwise specified in the applicable Prospectus Supplement, the
Debt Securities of a series may be issued in whole or in part in the form of one
or more fully registered global securities (a "Registered Global Security") that
will be deposited with a depository (the "Depository") or with a nominee for the
Depository identified in the applicable Prospectus Supplement. In such a case,
one or more Registered Global Securities will be issued in a denomination or
aggregate denominations equal to the portion of the aggregate principal amount
of outstanding Debt Securities of the series to be represented by such
Registered Global Security or Securities. (Section 3.03.) Unless and until it is
exchanged in whole or in part for Debt Securities in definitive certificated
form, a Registered Global Security may not be registered for transfer or
exchange except as a whole by the Depository for such Registered Global Security
to a nominee of such Depository or by a nominee of such Depository to such
Depository or another nominee of such Depository or by such Depository or any
such nominee to a successor Depository for such series or a nominee of such
successor Depository and except in the circumstances described in the applicable
Prospectus Supplement. (Section 3.05.)
 
                                       45
<PAGE>   66
 
     The specific terms of the depository arrangement with respect to any
portion of a series of Debt Securities to be represented by a Registered Global
Security will be described in the applicable Prospectus Supplement. Unless
otherwise specified in the applicable Prospectus Supplement, the Company expects
that the following provisions will apply to such depository arrangements.
 
     Ownership of beneficial interests in a Registered Global Security will be
limited to participants or persons that may hold interests through participants
(as such term is defined below). Upon the issuance of any Registered Global
Security, and the deposit of such Registered Global Security with or on behalf
of the Depository for such Registered Global Security, the Depository will
credit, on its book-entry registration and transfer system, the respective
principal amounts of the Debt Securities represented by such Registered Global
Security to the accounts of institutions ("participants") that have accounts
with the Depository or its nominee. The accounts to be credited will be
designated by the underwriters or agents engaging in the distribution of such
Debt Securities or by the Company, if such Debt Securities are offered and sold
directly by the Company. Ownership of beneficial interests by participants in
such Registered Global Security will be shown on, and the transfer of such
beneficial interests will be effected only through, records maintained by the
Depository for such Registered Global Security or by its nominee. Ownership of
beneficial interests in such Registered Global Security by persons that hold
through participants will be shown on, and the transfer of such beneficial
interests within such participants will be effected only through, records
maintained by such participants. The laws of some jurisdictions require that
certain purchasers of securities take physical delivery of such securities in
certificated form. The foregoing limitations and such laws may impair the
ability to transfer beneficial interests in such Registered Global Security.
 
     So long as the Depository for a Registered Global Security, or its nominee,
is the registered owner of such Registered Global Security, such Depository or
such nominee, as the case may be, will be considered the sole owner or holder of
the Debt Securities represented by such Registered Global Security for all
purposes under the applicable Indenture. Unless otherwise specified in the
applicable Prospectus Supplement and except as specified below, owners of
beneficial interests in such Registered Global Security will not be entitled to
have Debt Securities of the series represented by such Registered Global
Security registered in their names, will not receive or be entitled to receive
physical delivery of Debt Securities of such series in certificated form and
will not be considered the holders thereof for any purposes under the relevant
Indenture. (Section 3.08.) Accordingly, each person owning a beneficial interest
in such Registered Global Security must rely on the procedures of the Depository
and, if such person is not a participant, on the procedures of the participant
through which such person owns its interest, to exercise any rights of a holder
under the relevant Indenture. The Depository may grant proxies and otherwise
authorize participants to give or take any request, demand, authorization,
direction, notice, consent, waiver or other action which a holder is entitled to
give or take under the relevant Indenture. The Company understands that, under
existing industry practices, if the Company requests any action of holders or if
any owner of a beneficial interest in such Registered Global Security desires to
give any notice or take any action which a holder is entitled to give or take
under the relevant Indenture, the Depository would authorize the participants to
give such notice or take such action, and such participants would authorize
beneficial owners owning through such participants to give such notice or take
such action or would otherwise act upon the instructions of beneficial owners
owning through them.
 
     Unless otherwise specified in the applicable Prospectus Supplement,
payments with respect to principal, premium, if any, and interest, if any, on
Debt Securities represented by a Registered Global Security registered in the
name of a Depository or its nominee will be made to such Depository or its
nominee, as the case may be, as the registered owner of such Registered Global
Security.
 
     The Company expects that the Depository for any Debt Securities represented
by a Registered Global Security, upon receipt of any payment of principal,
premium or interest, will immediately credit participants' accounts with
payments in amounts proportionate to their respective beneficial interests in
the principal amount of such Registered Global Security as shown on the records
of such Depository. The Company also expects that payments by participants to
owners of beneficial interests in such Registered Global Security held through
such participants will be governed by standing instructions and customary
practices, as is now the case with the securities held for the accounts of
customers registered in "street names," and will be the responsibility of such
participants. None of the Company, the respective Trustees or any agent of the
                                       46
<PAGE>   67
 
Company or the respective Trustees shall have any responsibility or liability
for any aspect of the records relating to or payments made on account of
beneficial interests of a Registered Global Security, or for maintaining,
supervising or reviewing any records relating to such beneficial interests.
(Section 3.08.)
 
     Unless otherwise specified in the applicable Prospectus Supplement, if the
Depository for any Debt Securities represented by a Registered Global Security
is at any time unwilling or unable to continue as Depository or ceases to be a
clearing agency registered under the Exchange Act and a duly registered
successor Depository is not appointed by the Company within 90 days, the Company
will issue such Debt Securities in definitive certificated form in exchange for
such Registered Global Security. In addition, the Company may at any time and in
its sole discretion determine not to have any of the Debt Securities of a series
represented by one or more Registered Global Securities and, in such event, will
issue Debt Securities of such series in definitive certificated form in exchange
for all of the Registered Global Security or Securities representing such Debt
Securities. (Section 3.05.)
 
     The Debt Securities of a series may also be issued in whole or in part in
the form of one or more bearer global securities (a "Bearer Global Security")
that will be deposited with a depository, or with a nominee for such depository,
identified in the applicable Prospectus Supplement. Any such Bearer Global
Security may be issued in temporary or permanent form. (Section 3.04.) The
specific terms and procedures, including the specific terms of the depository
arrangement, with respect to any portion of a series of Debt Securities to be
represented by one or more Bearer Global Securities will be described in the
applicable Prospectus Supplement.
 
CONSOLIDATION, MERGER OR SALE BY THE COMPANY
 
     Unless otherwise specified in the applicable Prospectus Supplement, the
Company shall not consolidate with or merge with or into any other corporation
or sell its assets substantially as an entirety, unless: (i) the corporation
formed by such consolidation or into which the Company is merged or the
corporation which acquires its assets is organized and existing under the laws
of the United States or any state thereof; (ii) the corporation formed by such
consolidation or into which the Company is merged or which acquires the
Company's assets substantially as an entirety expressly assumes by supplemental
indenture the due and punctual payment of the principal of, premium, if any, and
any Additional Amounts or interest on, the Debt Securities and the performance
or observance of every covenant of the Company under each Indenture and the Debt
Securities; (iii) immediately after giving effect to such transaction, and
treating any indebtedness which becomes an obligation of the Company or a
Subsidiary of the Company as a result of such transaction as having been
incurred by the Company or such Subsidiary at the time of such transaction, no
Default or Event of Default exists and is continuing; and (iv) if, as a result
of such transaction, properties or assets of the Company would become subject to
an encumbrance which would not be permitted by the terms of any series of Debt
Securities, the Company or the successor corporation, as the case may be, shall
take such steps as are necessary to secure such Debt Securities equally and
ratably with all indebtedness secured thereunder. Upon any such consolidation,
merger or sale, the successor corporation formed by such consolidation, or into
which the Company is merged or to which such sale is made, shall succeed to, and
be substituted for the Company under each Indenture. (Section 7.01.)
 
EVENTS OF DEFAULT, NOTICE AND CERTAIN RIGHTS ON DEFAULT
 
     Each Indenture provides that, if an Event of Default specified therein
occurs with respect to the Debt Securities of any series and is continuing, the
Trustee for such series or the holders of 25% in aggregate principal amount of
all of the outstanding Debt Securities of that series, by written notice to the
Company (and to the Trustee for such series, if notice is given by such holders
of Debt Securities), may declare the principal of (or, if the Debt Securities of
that series are Original Issue Discount Securities or Indexed Securities, such
portion of the principal amount specified in the Prospectus Supplement) and
accrued interest on all the Debt Securities of that series to be due and payable
(provided, with respect to any Debt Securities issued under the Subordinated
Indenture, that the payment of principal and interest on such Debt Securities
shall remain subordinated to the extent provided in the Subordinated Indenture).
(Section 5.02.)
 
                                       47
<PAGE>   68
 
     Unless otherwise specified in the applicable Prospectus Supplement, Events
of Default with respect to Debt Securities of any series are defined in each
Indenture as being: (a) default in payment of any interest on any Debt Security
of that series or any coupon appertaining thereto or any Additional Amount
payable with respect to Debt Securities of such series as specified in the
applicable Prospectus Supplement when the same becomes due and payable and the
same continues for 30 days; (b) default in payment of principal, or premium, if
any, at maturity or on redemption or otherwise, or in the making of a mandatory
sinking fund payment of any Debt Securities of that series when due; (c) default
continuing for 60 days after notice to the Company by the Indenture Trustee for
such series, or by the holders of 25% in aggregate principal amount of the Debt
Securities of such series then outstanding to the Company and the Indenture
Trustee, in the performance of any other agreement or covenant (other than an
agreement or covenant for which non-compliance is elsewhere specifically dealt
with in this paragraph) in the Debt Securities of that series, in the Indenture
or in any supplemental indenture or board resolution referred to therein under
which the Debt Securities of that series may have been issued; (d) a default
under any mortgage, agreement, indenture or instrument under which there may be
issued, or by which there may be evidenced any Debt of the Company, whether
existing now or in the future, in an aggregate principal amount then outstanding
of $25 million or more, which default (i) shall constitute a failure to pay any
portion of the principal of such Debt when due and payable after the expiration
of an applicable grace period with respect thereto or (ii) shall result in such
Debt becoming or being declared due and payable, and such acceleration shall not
be rescinded or annulled, or such Debt shall not be paid in full within a period
of 30 days after there has been given, to the Company by the Indenture Trustee
or to the Company and the Indenture Trustee by the holders of at least 25% in
aggregate principal amount of the Outstanding Debt Securities of such series
provided that such Event of Default will be remedied, cured or waived if the
default that resulted in the acceleration of such other indebtedness is
remedied, cured or waived; and (e) certain events of bankruptcy, insolvency or
reorganization of the Company. (Section 5.01.) The definition of "Event of
Default" in each Indenture specifically excludes a default under a secured debt
under which the obligee has recourse (exclusive of recourse for ancillary
matters such as environmental indemnities, misapplication of funds, costs of
enforcement, etc.) only to the collateral pledged for repayment, and where the
fair market value of such collateral does not exceed two percent of Total Assets
(as defined in the Indenture) at the time of the default. Events of Default with
respect to a specified series of Debt Securities may be added to the Indenture
and, if so added, will be described in the applicable Prospectus Supplement.
(Sections 3.01 and 5.01(7).)
 
     At any time after a declaration of acceleration has been made with respect
to Debt Securities of any series but before a judgment or decree for payment has
been obtained by the applicable Indenture Trustee, the Holders of a majority in
principal amount of Outstanding Debt Securities of that series may rescind any
declaration of acceleration and its consequences, provided that all payments due
(other than those due as a result of acceleration) have been made and all Events
of Default have been cured or waived. (Section 5.02)
 
     Each Indenture provides that the Indenture Trustee will, within 90 days
after the occurrence of a Default with respect to the Debt Securities of any
series, give to the holders of the Debt Securities of that series notice of all
Defaults known to it unless such Default shall have been cured or waived;
provided that except in the case of a Default in payment on the Debt Securities
of that series, the Indenture Trustee may withhold the notice if and so long as
a committee of its Responsible Officers in good faith determines that
withholding such notice is in the interests of the holders of the Debt
Securities of that series. (Section 6.06.) "Default" means any event which is,
or after notice or passage of time or both, would be, an Event of Default.
(Section 1.01.)
 
     Each Indenture provides that the holders of a majority in aggregate
principal amount of the Debt Securities of each series affected (with each such
series voting as a class) may, subject to certain limited conditions, direct the
time, method and place of conducting any proceeding for any remedy available to
the Indenture Trustee for such series, or exercising any trust or power
conferred on such Indenture Trustee. (Section 5.08.)
 
     Each Indenture includes a covenant that the Company will file annually with
the Indenture Trustee a certificate as to the Company's compliance with all
conditions and covenants of such Indenture. (Section 9.05.)
 
                                       48
<PAGE>   69
 
     The holders of a majority in aggregate principal amount of any series of
Debt Securities by notice to the Indenture Trustee for such series may waive, on
behalf of the holders of all Debt Securities of such series, any past Default or
Event of Default with respect to that series and its consequences except a
Default or Event of Default in the payment of the principal of, premium, if any,
or interest, if any, or any Additional Amounts on any Debt Security, and except
in respect of an Event of Default resulting from the breach of a covenant or
provision of either Indenture which, pursuant to the applicable Indenture,
cannot be amended or modified without the consent of the holders of each
outstanding Debt Security of such series affected. (Section 5.07.)
 
OPTION TO DEFER INTEREST PAYMENTS
 
     If provided in the applicable Prospectus Supplement, the Company shall have
the right at any time and from time to time during the term of any series of
Junior Subordinated Debt to defer the payment of interest on such series for
such number of consecutive interest payment periods as may be specified in the
applicable Prospectus Supplement (each, an "Extension Period"), subject to the
terms, conditions and covenants, if any, specified in such Prospectus
Supplement, provided that such Extension Period may not extend beyond the stated
maturity of such Junior Subordinated Debt. Certain material United States
Federal income tax consequences and special considerations applicable to any
such Junior Subordinated Debt will be described in the applicable Prospectus
Supplement.
 
     Unless otherwise specified in the applicable Prospectus Supplement, at the
end of such Extension Period, the Company shall pay all interest then accrued
and unpaid together with interest thereon compounded semiannually at the rate
specified for the Junior Subordinated Debt of such series to the extent
permitted by applicable law ("Compound Interest"); provided, that during any
such Extension Period, (a) the Company shall not declare or pay dividends on,
make distributions with respect to, or redeem, purchase, acquire or make a
liquidation payment with respect to, any of its capital stock (other than (i)
purchases or acquisitions of Common Stock of the Company in connection with the
satisfaction by the Company of its obligations under any employee or agent
benefit plans or the satisfaction by the Company of its obligations pursuant to
any contract or security outstanding on the date of such event requiring the
Company to purchase Common Stock of the Company, (ii) as a result of a
reclassification of the Company's capital stock or the exchange or conversion of
one class or series of the Company's capital stock for another class or series
of the Company's capital stock, (iii) the purchase of fractional interests in
shares of the Company's capital stock pursuant to the conversion or exchange
provisions of such capital stock or the security being converted or exchanged,
(iv) dividends or distributions in Common Stock of the Company (or rights to
acquire capital stock) or repurchases or redemptions of capital stock solely
from the issuance or exchange of capital stock or (v) redemptions or repurchases
of any rights outstanding under a shareholder rights plan), (b) the Company
shall not make any payment of interest, principal or premium, if any, on or
repay, repurchase or redeem any debt securities issued by the Company that rank
pari passu in right of payment with or junior to the Junior Subordinated Debt of
such series, and (c) the Company shall not make any guarantee payments with
respect to the foregoing (other than payments pursuant to the Guarantee or the
Common Guarantee. Prior to the termination of any such Extension Period, the
Company may further defer payments of interest by extending the interest payment
period; provided, however, that, such Extension Period may not extend beyond the
maturity of the Junior Subordinated Debt of such series. Upon the termination of
any Extension Period and the payment of all amounts then due, the Company may
commence a new Extension Period, subject to the terms set forth in this section.
No interest during an Extension Period, except at the end thereof, shall be due
and payable, but the Company may prepay at any time all or any portion of the
interest accrued during an Extension Period. If the applicable Property Trustee
shall be the sole holder of the Junior Subordinated Debt of such series subject
to an Extension Period, the Company shall give the applicable Administrative
Trustee, the applicable Indenture Trustee and the applicable Property Trustee
notice of its selection of such Extension Period one Business Day prior to the
earlier of (i) the date distributions on the Capital Securities are payable or
(ii) the date the applicable Administrative Trustee is required to give notice
to the New York Stock Exchange (or other applicable self-regulatory
organization) or to holders of the Capital Securities of record or payment date
of such distribution. The applicable Administrative Trustee shall give notice of
the Company's selection of such Extension Period to the holders of the Capital
Securities. If the applicable Property Trustee shall not be the sole holder of
the Junior Subordinated Debt of such series subject to the Extension Period, the
                                       49
<PAGE>   70
 
Company shall give the holders of the Junior Subordinated Debt of such series
subject to the Extension Period notice of its selection of such Extension Period
ten Business Days prior to the earlier of (i) the Interest Payment Date for the
series of Junior Subordinated Debt subject to the Extension Period or (ii) the
date upon which the Company is required to give notice to the New York Stock
Exchange (or other applicable self-regulatory organization) or to holders of the
Junior Subordinated Debt of such series subject to the Extension Period of the
record or payment date of such related interest payment.
 
MODIFICATION OF THE INDENTURES
 
     Unless otherwise specified in the applicable Prospectus Supplement, each
Indenture contains provisions permitting the Company and the Indenture Trustee
to enter into one or more supplemental indentures without the consent of the
holders of any of the Debt Securities in order (i) to evidence the succession of
another corporation to the Company and the assumption of the covenants and
obligations of the Company under the Indenture and the Debt Securities by a
successor to the Company; (ii) to add to the covenants of the Company or
surrender any right or power of the Company; (iii) to add additional Events of
Default with respect to any series of Debt Securities; (iv) to add or change any
provisions to such extent as necessary to permit or facilitate the issuance of
Debt Securities in bearer form; (v) to change or eliminate any provision
affecting only Debt Securities not yet issued; (vi) to secure the Debt
Securities; (vii) to establish the form or terms of Debt Securities; (viii) to
evidence and provide for successor Indenture Trustees; (ix) if allowed without
penalty under applicable laws and regulations, to permit payment in respect of
Debt Securities in bearer form in the United States; (x) to correct any defect
or supplement any inconsistent provisions or to make any other provisions with
respect to matters or questions arising under such Indenture, provided that such
action does not adversely affect the interests of any holder of Debt Securities
of any series; or (xi) to cure any ambiguity or correct any mistake. The
Subordinated Indenture also permits the Company and the Indenture Trustee
thereunder to enter into such supplemental indentures to modify the
subordination provisions contained in the Subordinated Debenture except in a
manner adverse to any outstanding Debt Securities. (Section 8.01.)
 
     Unless otherwise specified in the applicable Prospectus Supplement, each
Indenture also contains provisions permitting the Company and the Indenture
Trustee, with the consent of the holders of a majority in aggregate principal
amount of the outstanding Debt Securities of each series affected by such
supplemental indenture (with the Debt Securities of each series voting as a
class), to execute supplemental indentures adding any provisions to or changing
or eliminating any of the provisions of such Indenture or any supplemental
indenture or modifying the rights of the holders of Debt Securities of such
series, except that, without the consent of the holder of each Debt Security so
affected, no such supplemental indenture may: (i) change the time for payment of
principal or premium, if any, or interest or any Additional Amounts on any Debt
Security; (ii) reduce the principal of, or any installment of principal of, or
premium, if any, or interest or any Additional Amounts on any Debt Security, or
change the manner in which the amount of any of the foregoing is determined;
(iii) reduce the amount of premium, if any, payable upon the redemption of any
Debt Security; (iv) reduce the amount of principal payable upon acceleration of
the maturity of any Original Issue Discount or Index Security; (v) change the
currency or currency unit in which any Debt Security or any premium or interest
or any Additional Amounts thereon is payable; (vi) impair the right to institute
suit for the enforcement of any payment on or with respect to any Debt Security;
(vii) reduce the percentage in principal amount of the outstanding Debt
Securities affected thereby the consent of whose holders is required for
modification or amendment of such Indenture or for waiver of compliance with
certain provisions of the Indenture or for waiver of certain defaults; (viii)
change the obligation of the Company to maintain an office or agency in the
places and for the purposes specified in such Indenture; (ix) modify the
provisions relating to the subordination of outstanding Debt Securities of any
series in a manner adverse to the holders thereof; or (x) modify the provisions
relating to waiver of certain defaults or any of the foregoing provisions.
(Section 8.02.)
 
SUBORDINATION UNDER THE SUBORDINATED INDENTURE
 
     The Subordinated Indenture provides that any Junior Subordinated Debt
issued thereunder are subordinate and junior in right of payment to all Senior
Indebtedness to the extent provided in the
 
                                       50
<PAGE>   71
 
Subordinated Indenture. (Section 12.01 of the Subordinated Indenture.) The
Subordinated Indenture defines the term "Senior Indebtedness" as: (i) all
indebtedness of the Company, whether outstanding on the date of the Subordinated
Indenture or thereafter created, incurred or assumed, which is for money
borrowed, or which is evidenced by a note or similar instrument given in
connection with the acquisition of any business, properties or assets, including
securities; (ii) any indebtedness of others of the kinds described in the
preceding clause (i) the payment of which the Company is responsible or liable
as guarantor or otherwise; and (iii) amendments, renewals, extensions and
refundings of any such indebtedness, unless in any instrument or instruments
evidencing or securing such indebtedness or pursuant to which the same is
outstanding, it is provided that such indebtedness is not senior in right of
payment to, or that such indebtedness is pari passu in right of payment with or
junior to, the Junior Subordinated Debt. The Senior Indebtedness shall continue
to be Senior Indebtedness and entitled to the benefits of the subordination
provisions irrespective of any amendment, modification or waiver of any term of
the Senior Indebtedness or extension or renewal of the Senior Indebtedness.
Senior Indebtedness does not include (A) any indebtedness of the Company to any
of its subsidiaries, (B) liabilities of the Company incurred in the ordinary
course of its business or (C) any indebtedness which by its terms is expressly
made pari passu in right of payment with or subordinated to the 8.85% Capital
Securities and the Guarantees. (Section 1.01 of the Subordinated Indenture.)
 
     In the event and during the continuation of (i) a Company default in the
payment of any principal, interest, if any or premium, if any, or any Additional
Amounts on any Senior Indebtedness when the same becomes due and payable,
whether at maturity or at a date fixed for prepayment or declaration or
otherwise or (ii) an event of default with respect to any Senior Indebtedness
permitting the holders thereof to accelerate the maturity thereof and written
notice of such event of default (requesting that payments on Junior Subordinated
Debt cease) is given to the Company by the holders of Senior Indebtedness, then
unless and until such default in payment or event of default shall have been
cured or waived or shall have ceased to exist, no direct or indirect payment (in
cash, property or securities, by set-off or otherwise) shall be made or agreed
to be made on account of the Junior Subordinated Debt or interest thereon or in
respect of any repayment, redemption, retirement, purchase or other acquisition
of Junior Subordinated Debt. (Section 12.03 of the Subordinated Indenture.)
 
     In the event of (i) any insolvency, bankruptcy, receivership, liquidation,
reorganization, readjustment, composition or other similar proceeding relating
to the Company or its property, (ii) any proceeding for the liquidation,
dissolution or other winding-up of the Company, voluntary or involuntary,
whether or not involving insolvency or bankruptcy proceedings, (iii) any
assignment by the Company for the benefit of creditors or (iv) any other
marshaling of the assets and liabilities of the Company, all Senior Indebtedness
(including, without limitations interest accruing after the commencement of any
such proceeding, assignment or marshaling of assets) shall first be paid in full
or provision must be made for such payment in cash or cash equivalents or
otherwise in a manner satisfactory to the holders of Senior Indebtedness before
any payment or distribution, whether in cash, securities or other property,
shall be made by the Company on account of Junior Subordinated Debt. In any such
event, any payment or distribution, whether in cash, securities or other
property (other than securities of the Company or any other corporation provided
for by a plan of reorganization or readjustment, the payment of which is
subordinate, at least to the extent provided in the subordination provisions of
the Subordinated Indenture with respect to the indebtedness evidenced by Junior
Subordinated Debt, to the payment of all Senior Indebtedness at the time
outstanding and to any securities issued in respect thereof under any such plan
of reorganization or readjustment), which would otherwise (but for the
subordination provisions) be payable or deliverable in respect of Junior
Subordinated Debt (including any such payment or distribution which may be
payable or deliverable by reason of the payment of any other indebtedness of the
Company being subordinated to the payment of Junior Subordinated Debt) shall be
paid or delivered directly to the holders of Senior Indebtedness, or to their
representative or trustee, in accordance with the priorities then existing among
such holders until all Senior Indebtedness shall have been paid in full.
(Section 12.02 of the Subordinated Indenture.) No present or future holder of
any Senior Indebtedness shall be prejudiced in the right to enforce
subordination of the indebtedness evidenced by Junior Subordinated Debt by any
act or failure to act on the part of the Company. (Section 12.11 of the
Subordinated Indenture.)
 
                                       51
<PAGE>   72
 
     Senior Indebtedness shall not be deemed to have been paid in full unless
the holders thereof shall have received cash, securities or other property equal
to the amount of such Senior Indebtedness then outstanding (Section 12.01 of the
Subordinated Indenture). Upon the payment in full of all Senior Indebtedness,
the holders of Junior Subordinated Debt shall be subrogated to all the rights of
any holders of Senior Indebtedness to receive any further payments or
distributions applicable to the Senior Indebtedness until all Junior
Subordinated Debt shall have been paid in full, and such payments or
distributions received by any holder of Junior Subordinated Debt, by reason of
such subrogation, of cash, securities or other property which otherwise would be
paid or distributed to the holders of Senior Indebtedness, shall, as between the
Company and its creditors other than the holders of Senior Indebtedness, on the
one hand, and the holders of Junior Subordinated Debt, on the other, be deemed
to be a payment by the Company on account of Senior Indebtedness, and not on
account of Junior Subordinated Debt. (Section 12.06 of the Subordinated
Indenture.)
 
     The Subordinated Indenture provides that the foregoing subordination
provisions, insofar as they relate to any particular issue of Junior
Subordinated Debt, may be changed prior to such issuance. Any such change would
be described in the applicable Prospectus Supplement relating to such Junior
Subordinated Debt.
 
DEFEASANCE AND COVENANT DEFEASANCE
 
     If indicated in the applicable Prospectus Supplement, the Company may elect
either (i) to defease and be discharged from any and all obligations with
respect to the Debt Securities of or within any series (except as otherwise
provided in the relevant Indenture) ("defeasance") or (ii) to be released from
its obligations with respect to certain covenants applicable to the Debt
Securities of or within any series ("covenant defeasance"), upon the deposit
with the relevant Indenture Trustee (or other qualifying trustee), in trust for
such purpose, of money and/or Government Obligations which through the payment
of principal, interest, premium, if any, and any Additional Amounts in
accordance with their terms will provide money in an amount sufficient, without
reinvestment, to pay the principal of, any premium or interest on and any
Additional Amounts on such Debt Securities and any coupons appertaining thereto
on the Maturity or redemption, as the case may be, and any mandatory sinking
fund or analogous payments thereon. As a condition to defeasance or covenant
defeasance, the Company must deliver to the Indenture Trustee an Opinion of
Counsel to the effect that the Holders of such Debt Securities will not
recognize income, gain or loss for Federal income tax purposes as a result of
such defeasance or covenant defeasance and will be subject to Federal income tax
on the same amounts and in the same manner and at the same times as would have
been the case if such defeasance or covenant defeasance had not occurred. Such
Opinion of Counsel, in the case of defeasance under clause (i) above, must refer
to and be based upon a ruling of the Internal Revenue Service or a change in
applicable Federal income tax law occurring after the date of the relevant
Indenture. (Article IV.) If indicated in the applicable Prospectus Supplement,
in addition to obligations of the United States or an agency or instrumentality
thereof, Government Obligations may include obligations of the government or an
agency or instrumentality of the government issuing the currency or currency
unit in which Debt Securities of such series are payable. (Section 3.01.)
 
     In addition, with respect to the Subordinated Indenture, in order to be
discharged no event or condition shall exist that, pursuant to certain
provisions described under "-- Subordination under the Subordinated Indenture"
above, would prevent the Company from making payments of principal of (and
premium, if any) and interest, if any, and any Additional Amounts on Junior
Subordinated Debt at the date of the irrevocable deposit referred to above.
(Section 4.06 of the Subordinated Indenture.)
 
     The Company may exercise its defeasance option with respect to such Debt
Securities notwithstanding its prior exercise of its covenant defeasance option.
If the Company exercises its defeasance option, payment of such Debt Securities
may not be accelerated because of a Default or an Event of Default. (Section
4.04.) If the Company exercises its covenant defeasance option, payment of such
Debt Securities may not be accelerated by reason of a Default or an Event of
Default with respect to the covenants to which such covenant defeasance is
applicable. However, if such acceleration were to occur by reason of another
Event of Default, the realizable value at the acceleration date of the money and
Government Obligations in the defeasance trust could be less than the principal
and interest then due on such Debt Securities, in that the
                                       52
<PAGE>   73
 
required deposit in the defeasance trust is based upon scheduled cash flow
rather than market value, which will vary depending upon interest rates and
other factors.
 
THE TRUSTEES
 
     Unless otherwise specified in the applicable Prospectus Supplement, First
Union Bank will be the Indenture Trustee under the Senior Indenture, and First
Union Bank will be the Indenture Trustee under the Subordinated Indenture. The
Company may also maintain banking and other commercial relationships with each
of the Trustees and their affiliates in the ordinary course of business.
 
                          DESCRIPTION OF CAPITAL STOCK
 
     The following description does not purport to be complete and is qualified
in its entirety by reference to the Company's Articles of Incorporation and the
Company's By-laws.
 
GENERAL
 
     The Company is currently authorized to issue 75,000,000 shares of Class A
Common Stock, no par value, and 50,000,000 shares of Class B Common Stock, no
par value. On May 8, 1998, the Company's shareholders approved an amendment to
its Articles of Incorporation to increase the Company's authorized Class A
Common Stock from 75,000,000 shares to 180,000,000 shares. The Company will be
authorized to issue 180,000,000 shares of Class A Common Stock upon approval of
such amendment by the Iowa Commissioner of Insurance and the Iowa Attorney
General and upon filing such amendment with the Iowa Secretary of State. As of
December 31, 1997 there were 29,734,918 shares of Class A Common Stock
outstanding and 5,000,000 shares of Class B Common Stock outstanding, of which
12,380,300 of the Class A Common Stock and 5,000,000 of the Class B Common Stock
were held by AmerUs Group. In addition, 1,400,000 and 150,000 shares of Class A
Common Stock are reserved for issuance under options granted or available for
grant under the Stock Plan and Director Plan, respectively, and 5 million shares
of Class A Common Stock are reserved for issuance upon conversion of Class B
Common Stock. At its meeting on February 19, 1998 the Board of Directors
approved a resolution recommending that the Company solicit shareholder approval
to increase the authorized issuance of Class A Common Stock, no par value, from
75,000,000 to 180,000,000 shares. The Company intends to seek such approval at
its annual meeting of stockholders scheduled for May 8, 1998. The Company is
also authorized to issue 20 million shares of preferred stock on such terms as
determined by its Board of Directors (the "Preferred Stock"). See "-- Preferred
Stock."
 
     The Class B Common Stock (or any interest therein) may only be owned by
AMHC or a mutual insurance holding company or intermediate holding company which
is expressly authorized by applicable law to own or have a beneficial interest
in the Class B Common Stock (a "Permitted Class B Holder"). Under current Iowa
law, a Permitted Class B Holder must at all times possess the right to cast at
least a majority of the votes of the outstanding shares of the capital stock of
the Company.
 
     The Company's Articles of Incorporation provide that the number of
outstanding shares of Class A Common Stock (excluding shares of Class A Common
Stock owned by AMHC or another Permitted Class B Holder) shall exceed the number
of outstanding shares of Class B Common Stock plus the shares of Class A Common
Stock owned by AMHC or another Permitted Class B Holder only as authorized by
law and never by a ratio of more than three to one.
 
COMMON STOCK
 
     Each share of Class A Common Stock will entitle its holder to one vote per
share on all matters upon which shareholders are entitled to vote (including
election of directors, mergers, sales of assets, dissolution and amendments to
the Articles of Incorporation). Each share of Class B Common Stock will entitle
its holder to one vote per share on all such matters except that, if on the
record date for determining shares eligible to vote, the number of outstanding
shares of Class A Common Stock (excluding shares of Class A Common Stock owned
by a Permitted Class B Holder) and any outstanding shares of Preferred Stock
having voting rights, if
 
                                       53
<PAGE>   74
 
any (excluding shares of Preferred Stock owned by a Permitted Class B Holder),
equals or exceeds the number of outstanding shares of Class B Common Stock plus
the number of outstanding shares of Class A Common Stock owned by a Permitted
Class B Holder, the voting rights for each share of Class B Common Stock shall
be equal to the aggregate number of shares of Class A Common Stock (excluding
shares of Class A Common Stock owned by a Permitted Class B Holder) and
Preferred Stock having voting rights, if any, then outstanding (excluding shares
of Preferred Stock owned by a Permitted Class B Holder) plus one divided by the
number of outstanding shares of Class B Common Stock. Accordingly, even if the
number of outstanding shares of Class A Common Stock (excluding shares of Class
A Common Stock owned by a Permitted Class B Holder) exceeds the number of
outstanding shares of Class B Stock, the Permitted Class B Holder will always
have a majority of the votes.
 
     Both classes of Common Stock will generally vote together as a single class
on all matters; however, the holders of Class A Common Stock and the holders of
Class B Common Stock will vote separately as a class with respect to certain
matters for which class voting is required under Iowa law, including (i)
approval of proposed amendments to the Company's Articles of Incorporation that,
among other things, would alter the designation, rights, preferences or
limitations of all or part of the shares of their respective class, increase or
decrease the aggregate number of authorized shares of such class, effect an
exchange or reclassification or create a right of exchange of all or part of the
shares of one class into shares of another class, create a new class of shares
or increase the rights, preferences, or number of authorized shares of any
existing class so that it would have rights or preferences with respect to
distribution or to dissolution that are prior, superior, or substantially equal
to, the shares of such class, provided that the Class A Common Stock and Class B
Common Stock are not affected by such amendment in the same or a substantially
similar way; (ii) approval of a proposed plan of merger or consolidation if such
plan contains any provisions which, if contained in a proposed amendment to the
Articles of Incorporation, would entitle such class of shares to vote as a class
(with certain limited exceptions for shareholders of the surviving corporation);
and (iii) approval of a plan of share exchange (to be voted upon by each class
included in the exchange).
 
     There is no provision in the Company's Articles of Incorporation permitting
cumulative voting in the election of directors.
 
     No cash dividends may be declared in any fiscal year on the Class B Common
Stock until and unless a cash dividend has been declared on the Class A Common
Stock. Any cash dividends will be declared and paid equally on both classes of
Common Stock.
 
     The classes of Common Stock will rank equally and have equal rights with
respect to distributions and all other rights, including distributions upon
liquidation of the Company. However, in the case of dividends or other
distributions payable on the Common Stock in shares of such stock, including
distributions pursuant to stock splits or stock dividends, only Class A Common
Stock will be distributed with respect to Class A Common Stock and only Class B
Common Stock will be distributed with respect to Class B Common Stock. In no
event will either class of Common Stock be split, divided or combined unless the
other is split, divided or combined equally.
 
     So long as the number of outstanding shares of Class A Common Stock
(excluding shares of Class A Common Stock owned by a Permitted Class B Holder)
shall exceed the number of outstanding shares of Class B Common Stock plus the
outstanding shares of Class A Common Stock owned by AMHC or another Permitted
Class B Holder only as authorized by law and never by a ratio of more than three
to one, the Class B Common Stock will be convertible at all times into Class A
Common Stock on a share-for-share basis by surrender of certificates to the
transfer agent for the Company. Such conversion will be without cost to the
shareholder, except for any transfer taxes which may be payable if certificates
for Class A Common Stock are issued in a name other than the one in which the
surrendered certificate is registered. Therefore, shareholders who subsequently
desire to sell some or all of their shares of Class B Common Stock may convert
those shares into an equal number of shares of Class A Common Stock and sell the
shares of Class A Common Stock in the public market. The Company will be
required to reserve shares of Class A Common Stock sufficient for issuance upon
conversion of Class B Common Stock. All shares of Class B Common Stock
surrendered upon conversion will have the status of authorized but unissued
shares of Class B Common Stock.
 
                                       54
<PAGE>   75
 
     The Articles of Incorporation provide that a Permitted Class B Holder has
the preemptive right to purchase Common Stock to the extent necessary to
maintain the ratio of Class A Common Stock to Class B Common Stock set forth in
the preceding paragraph. The Amended and Restated Intercompany Agreement dated
as of December 1, 1996 among AMHC, AmerUs Group and the Company also affords the
AmerUs Affiliated Group certain equity purchase rights.
 
     In the event that AMHC (or any successor mutual insurance holding company)
is demutualized and is converted into a stock company pursuant to Iowa law, then
immediately upon such conversion each share of the Class B Common Stock shall
automatically be converted into one share of Class A Common Stock. AMHC has no
present plans to demutualize.
 
     A Permitted Class B Holder may pledge, subject to a security interest or
lien, encumber, or otherwise hypothecate shares of Class B Common Stock in
excess of the number of shares of Class B Common Stock which carry the right to
cast at least a majority of the votes of the outstanding shares of capital stock
of the Company having voting rights. However, except for a transfer to a
Permitted Class B Holder, a conversion of Class B Common Stock into Class A
Common Stock and except as described in the preceding sentence, no shares of
Class B Common Stock may be conveyed, pledged or otherwise transferred. Any
conveyance, transfer, assignment, pledge, security interest, lien, encumbrance
or hypothecation or alienation by AMHC or any intermediate holding company, in
or on the majority of the voting shares of AmerUs Life shall be deemed void in
inverse chronological order from the date of such transaction to the extent
necessary to give AMHC unencumbered direct or indirect ownership of a majority
of such voting shares.
 
     All shares of Common Stock offered hereby, or issuable upon conversion,
exchange or exercise of Securities, will, when issued, be fully paid and
non-assessable. The Class A Common Stock is listed on the New York Stock
Exchange under the symbol "AMH."
 
     The Prospectus Supplement relating to an offering of Common Stock will
describe terms relevant thereto, including the number of shares offered, the
initial offering price, market price and dividend information.
 
PREFERRED STOCK
 
     The Board of Directors of the Company is authorized, subject to any
limitations prescribed by law, from time to time to issue up to an aggregate of
20 million shares of Preferred Stock in one or more series, each of such series
to have such voting powers, full or limited, or no voting powers, and such
designations, preferences and relative, participating, optional or other special
rights, and such qualifications, limitations or restrictions thereof, as shall
be determined by the Board of Directors in a resolution or resolutions providing
for the issue of such Preferred Stock and as shall be described in the
Prospectus Supplement relating to a particular series of Preferred Stock offered
thereby; provided, however, that no Preferred Stock may have more than one vote
per share. Thus, any series may, if so determined by the Board of Directors,
have full voting rights with the Class A Common Stock or superior or limited
voting rights, be convertible into Class A Common Stock or another security of
the Company, and have such other relative rights, preferences and limitations as
the Company's Board of Directors shall determine; provided, however, that no
Preferred Stock may have more than one vote per share.
 
     The applicable Prospectus Supplement will describe the following terms of
any series of Preferred Stock in respect of which this Prospectus is being
delivered (to the extent applicable to such Preferred Stock): (i) the specific
designation, number of shares, seniority and initial public offering or purchase
price; (ii) any liquidation preference per share; (iii) any date of maturity;
(iv) any redemption, repayment or sinking fund provisions; (v) any dividend rate
or rates and the dates on which any such dividends will be payable (or the
method by which such rates or dates will be determined) and whether such
dividends will be cumulative or non-cumulative; (vi) any voting rights (which
may not exceed one vote per share); (vii) if other than the currency of the
United States of America, the currency or currencies, including currency units
and composite currencies, in which such Preferred Stock is denominated and/or in
which payments will or may be payable; (viii) the method by which amounts in
respect of such Preferred Stock may be calculated and any commodities,
currencies or indices, or value, rate or price, relevant to such calculation;
(ix) whether the
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<PAGE>   76
 
Preferred Stock is convertible or exchangeable and, if so, the securities or
rights into which such Preferred Stock is convertible or exchangeable (which may
include other Preferred Stock, Debt Securities, Common Stock or other securities
or rights of the Company (including rights to receive payment in cash or
securities based on the value, rate or price of one or more specified
commodities, currencies or indices) or a combination of the foregoing), and the
terms and conditions upon which such conversions or exchanges will be effected,
including the initial conversion or exchange prices or rates, the conversion or
exchange period and any other related provisions; (x) the place or places where
dividends and other payments on the Preferred Stock will be payable; and (xi)
any additional voting, dividend, liquidation, redemption and other rights,
preferences, privileges, limitations and restrictions.
 
     As described under "Description of Depositary Shares", the Company may, at
its option, elect to offer Depositary Shares evidenced by depositary receipts
("Depositary Receipts"), each representing an interest (to be specified in the
applicable Prospectus Supplement relating to the particular series of the
Preferred Stock) in a share of the particular series of the Preferred Stock
issued and deposited with a Preferred Stock Depositary (as defined herein) in
lieu of offering full shares of such series of Preferred Stock.
 
     All shares of Preferred Stock offered hereby, or issuable upon conversion,
exchange or exercise of Securities, will, when issued, be fully paid and
non-assessable.
 
CAPITAL SECURITIES OF AMERUS CAPITAL I
 
     AmerUs Capital I, a Delaware business trust and a wholly-owned subsidiary
of the Company, issued $86 million of 8.85% Capital Securities (the "8.85%
Capital Securities") in 1997 as part of the Company's financing plan. The assets
of such trust are invested in Subordinated Debt Securities of the Company, which
debt securities have a stated maturity of thirty years from their date of
issuance. If the Company redeems all or a portion of the Subordinated Debt
Securities, AmerUs Capital I must redeem a corresponding amount of the 8.85%
Capital Securities.
 
CERTAIN PROVISIONS OF THE ARTICLES OF INCORPORATION AND BY-LAWS OF THE COMPANY
 
     The following discussion is a summary of certain provisions of the Articles
of Incorporation and By-laws of the Company relating to shareholder voting
rights, advance notice requirements and other provisions which may be deemed to
have an "anti-takeover" effect. In addition to these provisions, regulatory
restrictions on dispositions of Common Stock by the Company's parent corporation
as well as the inability of the holders of the Class A Common Stock to elect a
majority of the Company's Board of Directors may also deter attempts to effect,
or prevent the consummation of, a change in control of the Company. See
"Description of Capital Stock -- Common Stock." These and other provisions
affect shareholder rights and should be given careful attention. The following
description of certain of these provisions is necessarily general and is
qualified in its entirety by reference to the Company's Articles of
Incorporation and By-laws, copies of which are included as exhibits to the
Registration Statement of which this Prospectus is a part.
 
     ISSUANCE OF CLASS A COMMON STOCK, PREFERRED STOCK AND OTHER RIGHTS
 
     The Company believes that its ability to issue, by action of a majority of
the Company's entire Board of Directors, and without shareholder consent, the
authorized but unissued shares of Class A Common Stock, shares of Preferred
Stock and other rights will provide the Company with the flexibility necessary
to meet its future needs without experiencing the time delay of having to seek
shareholder approval. Unissued shares of Class A Common Stock and Preferred
Stock will be issuable from time to time for any corporate purpose, including,
without limitation, stock splits, stock dividends, employee benefit and
compensation plans, acquisition and public or private sales for cash as a means
of raising capital. It is possible that the Company's Board of Directors might
use its authority (subject to the restrictions referred to above) to issue Class
A Common Stock, Preferred Stock or other rights in a way that could deter or
impede the completion of a tender offer or other attempt to gain control of the
Company of which the Company's Board of Directors does not approve. The Company
does not have any predetermined plans or commitments to use its authority to
effect
 
                                       56
<PAGE>   77
 
any such issuance, but reserves the right to take any action in the future which
the Company's Board of Directors deems to be in the best interests of the
shareholders and the Company under the circumstances.
 
     It is not possible to state the actual effect of any issuance of Preferred
Stock upon the rights of holders of Class A Common Stock because the Company's
Board of Directors has not determined any issuance price or prices, terms or
rights relating to Preferred Stock. However, such effects might include (i)
restrictions on Class A Common Stock dividends if Preferred Stock dividends have
not been paid; (ii) dilution of the voting power and equity interest of existing
holders of Class A Common Stock to the extent that any Preferred Stock series
has voting rights or would acquire voting rights upon the occurrence of certain
events (such as the failure to pay dividends for a specified period) or that any
Preferred Stock series is convertible into Class A Common Stock; and (iii)
current holders of Class A Common Stock not being entitled to share in the
Company's assets upon liquidation, dissolution or winding-up until satisfaction
of any liquidation preferences granted to any series of Preferred Stock.
 
     BOARD OF DIRECTORS
 
     The Articles of Incorporation provide that the number of Company directors
will be determined pursuant to the By-laws, but will not be less than seven or
more than 21 directors (subject to the rights of the holders of any series of
Preferred Stock). The By-laws provide that the exact number of directors will be
determined from time to time by the affirmative vote of a majority of the
Company's entire Board of Directors. At any meeting of the Company's Board of
Directors, a majority of the Company's entire Board of Directors will constitute
a quorum for the transaction of business, and subject to certain exceptions, at
any meeting at which a quorum is present the affirmative vote of a majority of
the directors present will constitute the act of the Company's Board of
Directors. The Company's Board of Directors is divided into three classes,
designated Classes I, II and III, which must be as nearly equal in number as
possible. Directors of Class I hold office for a term expiring at the annual
meeting of shareholders to be held in 2000, directors of Class II hold office
for a term expiring at the annual meeting of shareholders to be held in 1998 and
directors of Class III hold office for a term expiring at the annual meeting of
shareholders to be held in 1999. At each annual meeting of shareholders
following such initial classification and election, the respective successors of
each class shall be elected for three-year terms, and each director will hold
office until such annual meeting and until his or her successor is elected and
qualified, unless the director dies, resigns, is disqualified or is removed from
office. Thus, approximately two-thirds of the members of the Board of Directors
at any time will have had prior board experience. With such a staggered Board of
Directors, at least two annual meetings will normally be required to effect a
change in the composition of a majority of the Board of Directors.
 
     Under the Iowa Business Corporation Act (the "IBCA") and the Company's
Articles of Incorporation, and subject to the rights of the holders of any
series of Preferred Stock, a majority of the Board of Directors though less than
a quorum, or the sole remaining director, may fill vacancies on the Board of
Directors or newly created directorships resulting from any increase in the
authorized number of directors. The Articles of Incorporation provide that the
election of directors need not be by written ballot unless the By-laws so
provide. The By-laws do not require the use of such a written ballot. The
By-laws provide that the holders of a majority of shares then entitled to vote
if an election of directors were held may remove any director or the entire
Board of Directors, with or without cause.
 
     LIMITATIONS ON CALLING SPECIAL MEETINGS OF SHAREHOLDERS
 
     Under Iowa law, special meetings of shareholders may be called by the Board
of Directors or by such other persons as may be authorized by the articles of
incorporation or the by-laws. In the case of the Company, the By-laws provide
that special meetings may be called by the Chairman, the President, the
Company's Board of Directors pursuant to a resolution adopted by not less than a
majority of the total number of directors or at the request of the holders of
not less than 10% of the combined voting power of the then outstanding stock of
the Company entitled to vote generally in the election of directors. The notice
for a special meeting must set forth the purpose or purposes of the meeting and,
except as otherwise required by law or the Articles of Incorporation, no
business will be transacted at any special meeting of shareholders other than
the items of business stated in the notice.
                                       57
<PAGE>   78
 
     ADVANCE NOTICE REQUIREMENTS
 
     The By-laws establish advance notice procedures with regard to (i) the
nomination, other than by or at the direction of the Company's Board of
Directors, of candidates for election to the Company's Board of Directors (the
"Nomination Provision") and (ii) certain business to be brought before an annual
meeting of shareholders of the Company (the "Business Provision").
 
     The Nomination Provision, by requiring advance notice of nominations by
shareholders, affords the Company's Board of Directors a meaningful opportunity
to consider the qualifications of the proposed nominees and, to the extent
deemed necessary or desirable by the Company's Board of Directors, to inform
shareholders about such qualifications.
 
     The Business Provision, by requiring advance notice of business proposed to
be brought before an annual meeting, provides a more orderly procedure for
conducting annual meetings of shareholders and provides the Company's Board of
Directors with a meaningful opportunity prior to the meeting to inform
shareholders, to the extent deemed necessary or desirable by the Company's Board
of Directors, of any business proposed to be conducted at such meeting, together
with any recommendation of the Company's Board of Directors. The Business
Provision does not affect the right of shareholders to make shareholder
proposals for inclusion in proxy statements for the Company's annual meetings of
shareholders pursuant to the rules of the Commission. In addition, neither the
Nomination Provision nor the Business Provision will prevent any shareholder or
shareholders holding at least 10% of the shares entitled to vote on a particular
matter from requesting a special meeting with respect to such matter as
described above in "-- Limitations on Calling Special Meetings of Shareholders."
 
     Although these By-law provisions do not give the Company's Board of
Directors any power to approve or disapprove of shareholder nominations for the
election of directors or of any other business desired by shareholders to be
conducted at an annual meeting, they may make it difficult for a third party to
conduct a solicitation of proxies to elect its own slate of directors or
otherwise attempt to obtain control of the Company, even if such a solicitation
or attempt might be beneficial to the Company and its shareholders.
 
     AMENDMENT OF ARTICLES OF INCORPORATION AND BY-LAWS
 
     Except to the extent the Articles of Incorporation or By-laws otherwise
provide, the Company's Board of Directors may, upon the affirmative vote of a
majority of the entire Board, amend or repeal any By-law. The Articles of
Incorporation may be amended with the affirmative vote of the holders of a
majority of the outstanding voting securities of the Company having the right to
vote generally in the election of directors; provided, that any proposed
amendment to the Articles of Incorporation which would alter the provision
relating to the ratio of outstanding shares of Class A Common Stock to
outstanding shares of Class B Common Stock would require the approval of a
majority of the outstanding shares of Class A Common Stock and Class B Common
Stock and a majority of the outstanding shares of Class A Common Stock
(excluding shares owned by the Permitted Class B Holders). Under Iowa law,
certain proposed amendments to the Articles of Incorporation which adversely
affect the rights of a particular class of stock must be approved by a majority
of such class.
 
     STATE STATUTORY PROVISIONS
 
     Any merger or acquisition of the Company by another entity or the
acquisition or attempted acquisition of more than 10% of the stock of the
Company is subject to regulatory approval by the Iowa Commissioner.
 
     Section 490.1108 of the IBCA provides that in considering acquisition
proposals, directors may consider, in addition to the consideration of the
effects of any action on shareholders, the effects on the Company's employees,
suppliers, creditors, customers and the communities in which it operates, as
well as the long-term and short-term interests of the Company. Consideration of
any or all community interest factors is not a violation of the business
judgment rule, even if the directors reasonably determine that effects on a
community or other factors outweigh the financial or other benefits to the
Company or a shareholder or group of shareholders. Section 490.624A of the IBCA
also includes authorization of "poison pills" which include,
 
                                       58
<PAGE>   79
 
without limitation, terms and conditions of stock rights or options issued by a
corporation that preclude or limit the exercise, transfer or receipt of stock
rights by persons owning or offering to acquire a specified number or percentage
of a corporation's outstanding shares. Unlike most states, Iowa does not
presently have a "business combination" law prohibiting business combinations
with a shareholder who holds over a specified percentage of stock for less than
a specified period after crossing the threshold.
 
     The foregoing provisions of state law could have the effect of delaying,
deferring or preventing a change in control of the Company if the Board of
Directors determines that a change of control is not in the best interests of
the Company, its shareholders and other constituencies. In addition, the
regulatory restrictions on the acquisition of securities of the Company may also
deter attempts to effect, or prevent the consummation of, a change in control of
the Company.
 
     Certain provisions of the Articles of Incorporation and the By-laws may
make it more difficult to effect a change in control of the Company if the Board
of Directors determines that such action would not be in the best interests of
the shareholders. It could be argued, contrary to the belief of the Board of
Directors, that such provisions are not in the best interests of the
shareholders to the extent that they will have the effect of tending to
discourage possible takeover bids, which might be at prices involving a premium
over then recent market quotations for the Common Stock. The most important of
those provisions are described below.
 
     The Articles of Incorporation authorize the establishment of a classified
Board of Directors pursuant to the By-laws. The By-laws, in turn, provide that
the Directors serve staggered three-year terms, with the members of only one
class being elected in any year. A classified Board of Directors may increase
the difficulty of removing incumbent directors, providing such directors with
enhanced ability to retain their positions. A classified Board of Directors may
also make the acquisition of control of the Company by a third party by means of
a proxy contest more difficult. In addition, the classification may make it more
difficult to replace a majority of directors for business reasons unrelated to a
change in control.
 
     As discussed above, Preferred Stock may be issued from time to time in one
or more series with such rights, preferences, limitations and restrictions as
may be determined by the Board of Directors. The issuance of Preferred Stock
could be used, under certain circumstances, as a method of delaying or
preventing a change of control of the Company and could have a detrimental
effect on the rights of holders of Common Stock, including loss of voting
control.
 
     The provisions of the Articles of Incorporation regarding the classified
Board of Directors and certain business combination transactions may not be
amended without the affirmative approval of holders of not less than 80% of the
outstanding voting stock of the Company.
 
     The By-laws may be amended by majority vote of the Board of Directors.
 
                            DESCRIPTION OF WARRANTS
 
     The Company may issue Warrants to purchase Debt Securities, Preferred
Stock, Common Stock or any combination thereof, and such Warrants may be issued
independently or together with any such Securities and may be attached to or
separate from such Securities. Each series of Warrants will be issued under a
separate warrant agreement (each a "Warrant Agreement") to be entered into
between the Company and a warrant agent ("Warrant Agent"). The Warrant Agent
will act solely as an agent of the Company in connection with the Warrants of
each such series and will not assume any obligation or relationship of agency
for or with holders or beneficial owners of Warrants. The following sets forth
certain general terms and provisions of the Warrants offered hereby. Further
terms of the Warrants and the applicable Warrant Agreement will be set forth in
the applicable Prospectus Supplement.
 
     The applicable Prospectus Supplement will describe the terms of any series
of Warrants in respect of which this Prospectus is being delivered, including
the following: (i) the title of such Warrants; (ii) the aggregate number of such
Warrants; (iii) the price or prices at which such Warrants will be issued; (iv)
the currency or currencies, including currency units or composite currencies, in
which the price of such Warrants may be payable; (v) the designation and terms
of the Securities (other than Capital Securities and Common
 
                                       59
<PAGE>   80
 
Securities) purchasable upon exercise of such Warrants; (vi) the price at which
and the currency or currencies, including currency units or composite
currencies, in which the Securities (other than Capital Securities and Common
Securities) purchasable upon exercise of such Warrants may be purchased; (vii)
the date on which the right to exercise such Warrants shall commence and the
date on which such right shall expire; (viii) whether such Warrants will be
issued in registered form or bearer form; (ix) if applicable, the minimum or
maximum amount of such Warrants which may be exercised at any one time; (x) if
applicable, the designation and terms of the Securities (other than Capital
Securities and Common Securities) with which such Warrants are issued and the
number of such Warrants issued with each such Security; (xi) if applicable, the
date on and after which such Warrants and the related Securities (other than
Capital Securities and Common Securities) will be separately transferable; (xii)
information with respect to book-entry procedures, if any; (xiii) if applicable,
a discussion of certain United States Federal income tax considerations; and
(xiv) any other terms of such Warrants, including terms, procedures and
limitations relating to the exchange and exercise of such Warrants.
 
             DESCRIPTION OF CAPITAL SECURITIES OF THE AMERUS TRUSTS
 
     Each AmerUs Trust may issue, from time to time, only one series of Capital
Securities having terms described in the Prospectus Supplement relating thereto.
The Declaration of each AmerUs Trust will authorize the Administrative Trustees
of such AmerUs Trust to issue on behalf of such AmerUs Trust one series of
Capital Securities. Each Declaration will be qualified as an indenture under the
Trust Indenture Act. The Property Trustee, an independent trustee, will act as
indenture trustee for the Capital Securities for purposes of compliance with the
provisions of the Trust Indenture Act. The Capital Securities will have such
terms, including distributions, redemption, voting, liquidation rights and such
other preferred, deferred or other special rights or such restrictions as shall
be established by the Administrative Trustees in accordance with the applicable
Declaration or as shall be set forth in the Declaration or made part of the
Declaration by the Trust Indenture Act. Reference is made to any Prospectus
Supplement relating to the Capital Securities of an AmerUs Trust for specific
terms of the Capital Securities, including, to the extent applicable, (i) the
distinctive designation of such Capital Securities, (ii) the number of Capital
Securities issued by such AmerUs Trust, (iii) the annual distribution rate (or
method of determining such rate) for Capital Securities issued by such AmerUs
Trust and the date or dates upon which such distributions shall be payable
(provided, however, that distributions on such Capital Securities shall, subject
to any deferral provisions, and any provisions for payment of defaulted
distributions, be payable on a quarterly basis to holders of such Capital
Securities as of a record date in each quarter during which such Capital
Securities are outstanding), (iv) any right of such AmerUs Trust to defer
quarterly distributions on the Capital Securities as a result of an interest
deferral right exercised by the Company on any Junior Subordinated Debt held by
such AmerUs Trust, (v) whether distributions on Capital Securities shall be
cumulative, and, in the case of Capital Securities having such cumulative
distribution rights, the date or dates or method of determining the date or
dates from which distributions on Capital Securities shall be cumulative, (vi)
the amount or amounts which shall be paid out of the assets of such AmerUs Trust
to the holders of Capital Securities upon voluntary or involuntary dissolution,
winding-up or termination of such AmerUs Trust, (vii) the obligation or option,
if any, of such AmerUs Trust to purchase or redeem Capital Securities and the
price or prices at which, the period or periods within which and the terms and
conditions upon which Capital Securities shall be purchased or redeemed, in
whole or in part, pursuant to such obligation or option with such redemption
price to be specified in the applicable Prospectus Supplement, (viii) the voting
rights, if any, of Capital Securities in addition to those required by law,
including the number of votes per Capital Security and any requirement for the
approval by the holders of Capital Securities as a condition to specified action
or amendments to the Declaration, (ix) the terms and conditions, if any, upon
which Junior Subordinated Debt held by such AmerUs Trust may be distributed to
holders of Capital Securities, and (x) any other relevant rights, preferences,
privileges, limitations or restrictions applicable to Capital Securities
consistent with the Declaration or with applicable law. All Capital Securities
offered hereby will be guaranteed by the Company to the extent set forth below
under "Description of Guarantees." The Guarantee issued for the benefit of the
holders of the Capital Securities, when taken together with the Company's
back-up undertakings, consisting of its obligations under each Declaration
(including the obligation to pay expenses of each AmerUs Trust), the
Subordinated
                                       60
<PAGE>   81
 
Indenture and any applicable supplemental indentures thereto and the Junior
Subordinated Debt issued to any AmerUs Trust will provide in the aggregate a
full and unconditional guarantee by the Company of amounts due on the Capital
Securities issued by each AmerUs Trust. The payment terms of the Capital
Securities will be the same as the Junior Subordinated Debt issued to the
applicable AmerUs Trust by the Company.
 
     Each Declaration will authorize the Administrative Trustees to issue on
behalf of the applicable AmerUs Trust one series of Common Securities having
such terms including distributions, redemption, voting, liquidation rights or
such restrictions as shall be established by the Administrative Trustees in
accordance with such Declaration or as shall otherwise be set forth therein. The
terms of the Common Securities issued by each AmerUs Trust will be substantially
identical to the terms of the Capital Securities issued by such AmerUs Trust,
and the Common Securities will rank pari passu in right of payment, and payments
will be made thereon pro rata, with the Capital Securities except that, if an
event of default under such Declaration has occurred and is continuing, the
rights of the holders of the Common Securities to payment in respect of
distributions and payments upon liquidation, redemption and otherwise will be
subordinated to the rights of the holders of the Capital Securities. The Common
Securities will also carry the right to vote and to appoint, remove or replace
any of the Administrative Trustees of such AmerUs Trust. All of the Common
Securities of each AmerUs Trust will be directly or indirectly owned by the
Company.
 
     The financial statements of any AmerUs Trust that issues Capital Securities
will be reflected in the Company's consolidated financial statements with the
Capital Securities shown as Company-obligated mandatorily-redeemable Capital
Securities of a subsidiary trust under minority interest in consolidated
subsidiaries. In a footnote to the Company's audited financial statements there
will be included statements that the applicable AmerUs Trust is wholly-owned by
the Company and that the sole asset of such AmerUs Trust is the Junior
Subordinated Debt (indicating the principal amount, interest rate and maturity
date thereof).
 
                           DESCRIPTION OF GUARANTEES
 
     Set forth below is a summary of information concerning the Guarantees that
will be executed and delivered by the Company for the benefit of the holders,
from time to time, of Capital Securities. Each Guarantee will be qualified as an
indenture under the Trust Indenture Act. Unless otherwise specified in the
applicable Prospectus Supplement, First Union Bank will act as indenture trustee
for Trust Indenture Act purposes under each Guarantee (the "Guarantee Trustee").
The terms of each Guarantee will be those set forth in such Guarantee and those
made part of such Guarantee by the Trust Indenture Act. The following summary
does not purport to be complete and is subject to and qualified in its entirety
by reference to the provisions of the form of Guarantee, a copy of which has
been filed as an exhibit to the Registration Statement of which this Prospectus
is a part, and the Trust Indenture Act. Each Guarantee will be held by the
Guarantee Trustee for the benefit of the holders of the Capital Securities of
the applicable AmerUs Trust.
 
GENERAL
 
     Unless otherwise specified in the applicable Prospectus Supplement,
pursuant to each Guarantee, the Company will agree, to the extent set forth
therein, to pay in full to the holders of the Capital Securities, the Guarantee
Payments (as defined below) (except to the extent paid by such AmerUs Trust), as
and when due, regardless of any defense, right of set-off or counterclaim which
such AmerUs Trust may have or assert. The following payments or distributions
with respect to the Capital Securities (the "Guarantee Payments"), to the extent
not paid by such AmerUs Trust, will be subject to the Guarantee (without
duplication): (i) any accrued and unpaid distributions that are required to be
paid on such Capital Securities, to the extent such AmerUs Trust shall have
funds available therefor, and (ii) the redemption price, including all accrued
and unpaid distributions to the date of redemption (the "Redemption Price"), to
the extent such AmerUs Trust has funds available therefor, with respect to any
Capital Securities called for redemption by such AmerUs Trust. The Company's
obligation to make a Guarantee Payment may be satisfied by direct payment of the
required amounts by the Company to the holders of Capital Securities or by
causing the applicable AmerUs Trust to pay such amounts to such holders.
 
                                       61
<PAGE>   82
 
     Each Guarantee will not apply to any payment of distributions except to the
extent the applicable AmerUs Trust shall have funds available therefor. If the
Company does not make interest or principal payments on the Junior Subordinated
Debt purchased by such AmerUs Trust, such AmerUs Trust will not pay
distributions on the Capital Securities issued by such AmerUs Trust and will not
have funds available therefor.
 
     The Company has also agreed to guarantee the obligations of each AmerUs
Trust with respect to the Common Securities (the "Common Guarantee") issued by
such AmerUs Trust to the same extent as the Guarantee, except that, if an Event
of Default under the Subordinated Indenture has occurred and is continuing,
holders of Capital Securities under the Guarantee shall have priority over
holders of the Common Securities under the Common Guarantee with respect to
distributions and payments on liquidation, redemption or otherwise.
 
STATUS OF THE GUARANTEES
 
     The Guarantees will constitute an unsecured obligation of the Company and
will rank (i) subordinate and junior in right of payment to the Senior
Indebtedness of the Company, except those liabilities of the Company made pari
passu or subordinate by their terms, (ii) pari passu with the most senior
preferred or preference stock now or hereafter issued by the Company and with
any guarantee now or hereafter entered into by the Company in respect of any
preferred or preference stock of any affiliate of the Company and (iii) senior
to the Common Stock. The terms of the Capital Securities provide that each
holder of Capital Securities by acceptance thereof agrees to the subordination
provisions and other terms of the Guarantee relating thereto.
 
     Each Guarantee will constitute a guarantee of payment and not of collection
(that is, the guaranteed party may institute a legal proceeding directly against
the Company to enforce its rights under such Guarantee without instituting a
legal proceeding against any other person or entity).
 
CERTAIN COVENANTS OF THE COMPANY
 
     Unless otherwise specified in the applicable Prospectus Supplement, in each
Guarantee the Company will covenant that, so long as any Capital Securities
issued by the applicable AmerUs Trust remain outstanding, if there shall have
occurred any event of default under such Guarantee or under the Declaration of
such AmerUs Trust, then (a) the Company will not declare or pay any dividend on,
make any distributions with respect to, or redeem, purchase, acquire or make a
liquidation payment with respect to, any of its capital stock (other than (i)
purchases or acquisitions of capital stock of the Company in connection with the
satisfaction by the Company of its obligations under any employee or agent
benefit plans or the satisfaction by the Company of its obligations pursuant to
any contract or security outstanding on the date of such event requiring the
Company to purchase capital stock of the Company, (ii) as a result of a
reclassification of the Company's capital stock or the exchange or conversion of
one class or series of the Company's capital stock for another class or series
of the Company's capital stock, (iii) the purchase of fractional interests in
shares of the Company's capital stock pursuant to the conversion or exchange
provisions of such capital stock or the security being converted or exchanged,
(iv) dividends or distributions in capital stock of the Company (or rights to
acquire capital stock) or repurchases or redemptions of capital stock solely
from the issuance or exchange of capital stock or (v) redemptions or repurchases
of any rights outstanding under a shareholder rights plan); (b) the Company
shall not make any payment of interest, principal or premium, if any, on or
repay, repurchase or redeem any debt securities issued by the Company which rank
junior to the Junior Subordinated Debt issued to the applicable AmerUs Trust and
(c) the Company shall not make any guarantee payments with respect to the
foregoing (other than pursuant to a Guarantee).
 
MODIFICATION OF THE GUARANTEES; ASSIGNMENT
 
     Except with respect to any changes that do not adversely affect the rights
of holders of Capital Securities (in which case no consent of such holders will
be required), each Guarantee may be amended only with the prior approval of the
holders of not less than a majority in liquidation amount of the outstanding
Capital
 
                                       62
<PAGE>   83
 
Securities of such AmerUs Trust. The manner of obtaining any such approval of
holders of such Capital Securities will be set forth in the accompanying
Prospectus Supplement. All guarantees and agreements contained in a Guarantee
shall bind the successors, assigns, receivers, trustees and representatives of
the Company and shall inure to the benefit of the holders of the Capital
Securities of the applicable AmerUs Trust then outstanding.
 
EVENTS OF DEFAULT
 
     An event of default under a Guarantee will occur upon the failure of the
Company to perform any of its payment or other obligations thereunder. The
holders of a majority in liquidation amount of the Capital Securities to which
such Guarantee relates have the right to direct the time, method and place of
conducting any proceeding for any remedy available to the Guarantee Trustee in
respect of such Guarantee or to direct the exercise of any trust or power
conferred upon the Guarantee Trustee under such Guarantee.
 
     If the Guarantee Trustee fails to enforce such Guarantee, any record holder
of Capital Securities to which such Guarantee relates may institute a legal
proceeding directly against the Company to enforce the Guarantee Trustee's
rights under such Guarantee without first instituting a legal proceeding against
the applicable AmerUs Trust, the Guarantee Trustee or any other person or
entity. Notwithstanding the foregoing, if the Company has failed to make a
Guarantee Payment under a Guarantee, a record holder of Capital Securities to
which such Guarantee relates may directly institute a proceeding against the
Company for enforcement of such Guarantee for such payment to the record holder
of the Capital Securities to which such Guarantee relates of the principal of or
interest on the applicable Junior Subordinated Debt on or after the respective
due dates specified in the Junior Subordinated Debt, and the amount of the
payment will be based on the holder's pro rata share of the amount due and owing
on all of the Capital Securities to which such Guarantee relates. The Company
has waived any right or remedy to require that any action be brought first
against the applicable AmerUs Trust or any other person or entity before
proceeding directly against the Company. The record holder in the case of the
issuance of one or more global Capital Securities certificates will be The
Depository Trust Company acting at the direction of the beneficial owners of the
Capital Securities.
 
     The Company will be required to provide annually to the Guarantee Trustee a
statement as to the performance by the Company of certain of its obligations
under each outstanding Guarantee and as to any default in such performance.
 
INFORMATION CONCERNING THE GUARANTEE TRUSTEE
 
     The Guarantee Trustee, prior to the occurrence of a default to a Guarantee,
undertakes to perform only such duties as are specifically set forth in such
Guarantee and, after default with respect to such Guarantee, shall exercise the
same degree of care as a prudent individual would exercise in the conduct of his
or her own affairs. Subject to such provision, the Guarantee Trustee is under no
obligation to exercise any of the powers vested in it by a Guarantee at the
request of any holder of Capital Securities to which such Guarantee relates
unless it is offered reasonable indemnity against the costs, expenses and
liabilities that might be incurred thereby.
 
TERMINATION
 
     Each Guarantee will terminate as to the Capital Securities issued by the
applicable AmerUs Trust upon full payment of the Redemption Price of all Capital
Securities of such AmerUs Trust, upon distribution of the Junior Subordinated
Debt held by such AmerUs Trust to the holders of all of the Capital Securities
of such AmerUs Trust or upon full payment of the amounts payable in accordance
with the Declaration of such AmerUs Trust upon liquidation of such AmerUs Trust.
Each Guarantee will continue to be effective or will be reinstated, as the case
may be, if at any time any holder of Capital Securities issued by the applicable
AmerUs Trust must restore payment of any sums paid under such Capital Securities
or such Guarantee.
 
                                       63
<PAGE>   84
 
GOVERNING LAW
 
     The Guarantees will be governed by and construed in accordance with the law
of the State of New York.
 
              DESCRIPTION OF THE PURCHASE CONTRACTS AND THE UNITS
 
     The Company may issue Purchase Contracts, including contracts obligating
holders to purchase from the Company, and the Company to sell to the holders, a
specified number of shares of Common Stock or Preferred Stock at a future date
or dates. The consideration per share of Common Stock or Preferred Stock may be
fixed at the time the Purchase Contracts are issued or may be determined by
reference to a specific formula set forth in the Purchase Contracts. The
Purchase Contracts may be issued separately or as a part of units ("Units"),
including, but not limited to, adjustable conversion-rate equity security units.
Each Unit consists of a Purchase Contract and Debt Securities, Capital
Securities or debt obligations of third parties, including U.S. Treasury
securities, securing the holders' obligations to purchase the Common Stock or
Preferred Stock under the Purchase Contracts. The Purchase Contracts may require
the Company to make periodic payments to the holders of the Units or vice versa,
and such payments may be unsecured or refunded on some basis. The Purchase
Contracts may require holders to secure their obligations thereunder in a
specified manner.
 
     The applicable Prospectus Supplement will describe the terms of any
Purchase Contracts or Units. The description in the Prospectus Supplement will
not necessarily be complete, and reference will be made to the Purchase
Contracts, and, if applicable, collateral arrangements and depositary
arrangements, relating to such Purchase Contracts or Units.
 
                              PLAN OF DISTRIBUTION
 
     The Company and/or any AmerUs Trust may sell any of the Securities being
offered hereby in any one or more of the following ways from time to time: (i)
through agents; (ii) to or through underwriters; (iii) through dealers; or (iv)
directly to purchasers.
 
     The Prospectus Supplement with respect to the Securities will set forth the
terms of the offering of the Securities, including the name or names of any
underwriters, dealers or agents; the purchase price of the Securities and the
proceeds to the Company and/or an AmerUs Trust from such sale; any underwriting
discounts and commissions or agency fees and other items constituting
underwriters' or agents' compensation; any initial public offering price and any
discounts or concessions allowed or reallowed or paid to dealers and any
securities exchange on which such Securities may be listed. Any initial public
offering price, discounts or concessions allowed or reallowed or paid to dealers
may be changed from time to time.
 
     The distribution of the Securities may be effected from time to time in one
or more transactions at a fixed price or prices, which may be changed, at market
prices prevailing at the time of sale, at prices related to such prevailing
market prices or at negotiated prices.
 
     Offers to purchase Securities may be solicited by agents designated by the
Company from time to time. Any such agent involved in the offer or sale of the
Securities in respect of which this Prospectus is delivered will be named, and
any commissions payable by the Company and/or the applicable AmerUs Trust to
such agent will be set forth, in the applicable Prospectus Supplement. Unless
otherwise indicated in such Prospectus Supplement, any such agent will be acting
on a reasonable best efforts basis for the period of its appointment. Any such
agent may be deemed to be an underwriter, as that term is defined in the
Securities Act, of the Securities so offered and sold.
 
     If Securities are sold by means of an underwritten offering, the Company
and/or the applicable AmerUs Trust will execute an underwriting agreement with
an underwriter or underwriters at the time an agreement for such sale is
reached, and the names of the specific managing underwriter or underwriters, as
well as any other underwriters, and the terms of the transaction, including
commissions, discounts and any other compensation of the underwriters and
dealers, if any, will be set forth in the applicable Prospectus Supplement which
will be used by the underwriters to make resales of the Securities in respect of
which this Prospectus is
                                       64
<PAGE>   85
 
delivered to the public. If underwriters are utilized in the sale of the
Securities in respect of which this Prospectus is delivered, the Securities will
be acquired by the underwriters for their own account and may be resold from
time to time in one or more transactions, including negotiated transactions, at
fixed public offering prices or at varying prices determined by the underwriter
at the time of sale. Securities may be offered to the public either through
underwriting syndicates represented by managing underwriters or directly by the
managing underwriters. If any underwriter or underwriters are utilized in the
sale of the Securities, unless otherwise indicated in the Prospectus Supplement,
the underwriting agreement will provide that the obligations of the underwriters
are subject to certain conditions precedent and that the underwriters with
respect to a sale of Securities will be obligated to purchase all such
Securities of a series if any are purchased.
 
     If a dealer is utilized in the sales of the Securities in respect of which
this Prospectus is delivered, the Company and/or the applicable AmerUs Trust
will sell such Securities to the dealer as principal. The dealer may then resell
such Securities to the public at varying prices to be determined by such dealer
at the time of resale. Any such dealer may be deemed to be an underwriter, as
such term is defined in the Securities Act, of the Securities so offered and
sold. The name of the dealer and the terms of the transaction will be set forth
in the Prospectus Supplement relating thereto.
 
     Offers to purchase Securities may be solicited directly by the Company
and/or the applicable AmerUs Trust and the sale thereof may be made by the
Company and/or the applicable AmerUs Trust directly to institutional investors
or others, who may be deemed to be underwriters within the meaning of the
Securities Act with respect to any resale thereof. The terms of any such sales
will be described in the Prospectus Supplement relating thereto.
 
     Agents, underwriters and dealers may be entitled under relevant agreements
to indemnification or contribution by the Company and/or the applicable AmerUs
Trust against certain liabilities, including liabilities under the Securities
Act.
 
     Agents, underwriters and dealers may be customers of, engage in
transactions with, or perform services for, the Company and its subsidiaries in
the ordinary course of business.
 
     Securities may also be offered and sold, if so indicated in the applicable
Prospectus Supplement, in connection with a remarketing upon their purchase, in
accordance with a redemption or repayment pursuant to their terms, or otherwise,
by one or more firms ("remarketing firms"), acting as principals for their own
accounts or as agents for the Company and/or the applicable AmerUs Trust. Any
remarketing firm will be identified and the terms of its agreement, if any, with
its compensation will be described in the applicable Prospectus Supplement.
Remarketing firms may be deemed to be underwriters, as such term is defined in
the Securities Act, in connection with the Securities remarketed thereby.
Remarketing firms may be entitled under agreements which may be entered into
with the Company and/or the applicable AmerUs Trust to indemnification or
contribution by the Company and/or the applicable AmerUs Trust against certain
civil liabilities, including liabilities under the Securities Act, and may be
customers of, engage in transactions with or perform services for AmerUs and its
subsidiaries in the ordinary course of business.
 
     If so indicated in the applicable Prospectus Supplement, the Company and/or
the applicable AmerUs Trust may authorize agents, underwriters or dealers to
solicit offers by certain types of institutions to purchase Securities from the
Company and/or the applicable AmerUs Trust at the public offering prices set
forth in the applicable Prospectus Supplement pursuant to delayed delivery
contracts ("Contracts") providing for payment and delivery on a specified date
or dates in the future. A commission indicated in the applicable Prospectus
Supplement will be paid to underwriters, dealers and agents soliciting purchases
of Securities pursuant to Contracts accepted by the Company and/or the
applicable AmerUs Trust.
 
     If so indicated in the applicable Prospectus Supplement, in connection with
the offering of Class A Common Stock or any Securities issued by the Company or
any AmerUs Trust, convertible or exchangeable into Class A Common Stock, the
Company's parent and majority shareholder, AmerUs Group, may be offered the
opportunity to purchase such Securities concurrently with a public offering at
the public offering price less any applicable underwriting discounts and
commissions.
 
                                       65
<PAGE>   86
 
                             VALIDITY OF SECURITIES
 
     Unless otherwise indicated in the applicable Prospectus Supplement, the
validity of Securities (other than the Capital Securities) will be passed upon
for the Company by Joseph K. Haggerty, Esq., Senior Vice President and General
Counsel of the Company and Sidley & Austin, Chicago, Illinois. Sidley & Austin
will rely as to matters governed by the laws of the State of Iowa upon the
opinion of Joseph K. Haggerty, Esq.
 
     Certain matters of Delaware law relating to the validity of the Capital
Securities will be passed upon for the AmerUs Trusts by Morris, James, Hitchens
& Williams, special Delaware counsel to the AmerUs Trusts.
 
                                    EXPERTS
 
     The consolidated financial statements of the Company, as of December 31,
1997 and 1996, and for each of the years in the three-year period ended December
31, 1997, have been incorporated by reference herein in reliance upon the
reports of KPMG Peat Marwick LLP, independent accountants, which reports are
also incorporated by reference herein, and upon the authority of said firm as
experts in accounting and auditing.
 
     The consolidated financial statements and schedules of Delta as of December
31, 1996 and 1995, and for each of the years in the three-year period ended
December 31, 1996, have been incorporated by reference herein in reliance upon
the reports of Coopers & Lybrand L.L.P., independent accountants, which reports
are also incorporated by reference herein, and upon the authority of said firm
as experts in accounting and auditing.
 
     The consolidated financial statements and schedules of AmVestors as of
December 31, 1996 and 1995, and for each of the years in the three-year period
ended December 31, 1996, have been incorporated by reference herein in reliance
upon the reports of Deloitte & Touche LLP, independent accountants, which
reports are also incorporated by reference herein, and upon the authority of
said firm as experts in accounting and auditing.
 
                                       66
<PAGE>   87
 
======================================================
 
     NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED OR INCORPORATED BY REFERENCE IN THIS
PROSPECTUS SUPPLEMENT OR THE PROSPECTUS, AND, IF GIVEN OR MADE, SUCH INFORMATION
OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED. THIS
PROSPECTUS SUPPLEMENT AND THE PROSPECTUS DO NOT CONSTITUTE AN OFFER TO SELL OR
THE SOLICITATION OF AN OFFER TO BUY ANY SECURITIES OTHER THAN THE SECURITIES
DESCRIBED IN THIS PROSPECTUS SUPPLEMENT OR AN OFFER TO SELL OR THE SOLICITATION
OF AN OFFER TO BUY SUCH SECURITIES IN ANY CIRCUMSTANCES IN WHICH SUCH OFFER OR
SOLICITATION IS UNLAWFUL. NEITHER THE DELIVERY OF THIS PROSPECTUS SUPPLEMENT OR
THE PROSPECTUS NOR ANY SALE MADE HEREUNDER OR THEREUNDER SHALL, UNDER ANY
CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THE INFORMATION CONTAINED HEREIN OR
THEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE OF SUCH INFORMATION.
                               ------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                          PAGE
                                          ----
<S>                                       <C>
         PROSPECTUS SUPPLEMENT
The Company.............................   S-4
Recent Developments.....................   S-4
Selected Consolidated Financial and
  Operating Data........................   S-5
Risk Factors............................   S-7
Use of Proceeds.........................   S-7
Capitalization..........................   S-8
Management's Discussion and Analysis of
  Results of Operations.................   S-9
Description of Notes....................  S-13
Underwriting............................  S-19
Validity of Notes.......................  S-20
 
               PROSPECTUS
Available Information...................     4
Incorporation of Certain Documents by
  Reference.............................     4
The Company.............................     6
The AmerUs Trusts.......................     8
Organizational Structure................    10
Selected Consolidated Financial and
  Operating Data........................    11
Risk Factors............................    13
Use of Proceeds.........................    18
Reorganization and Recent
  Acquisitions..........................    19
Management's Discussion and Analysis of
  Results of Operations and Financial
  Condition.............................    22
Business................................    34
Description of Debt Securities..........    43
Description of Capital Stock............    53
Description of Warrants.................    59
Description of Capital Securities of the
  AmerUs Trusts.........................    60
Description of Guarantees...............    61
Description of the Purchase Contracts
  and the Units.........................    64
Plan of Distribution....................    64
Validity of Securities..................    66
Experts.................................    66
</TABLE>
 
======================================================
======================================================
                                  $125,000,000
 
                                  AMERUS LIFE
                                 HOLDINGS, INC.
 
                               6.95% SENIOR NOTES
                                    DUE 2005
 
                        AMERUS LIFE HOLDINGS, INC. LOGO
                                  ------------
 
                             PROSPECTUS SUPPLEMENT
                                 JUNE 11, 1998
                          (INCLUDING PROSPECTUS DATED
                                 JUNE 10, 1998)
 
                                  ------------
                              SALOMON SMITH BARNEY
                              GOLDMAN, SACHS & CO.
                             CHASE SECURITIES INC.
                           CREDIT SUISSE FIRST BOSTON
======================================================


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