UTILICORP UNITED INC
424B5, 1996-10-18
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>
PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED MAY 31, 1995)
                                                  Filed Pursuant to Rule 424B(5)
                                                      Registration No. 033-59237
                                  $100,000,000
 
                                UTILICORP UNITED
 
                          6.70% SENIOR NOTES DUE 2006
 
    Interest on the 6.70% Senior Notes Due 2006 (the "Senior Notes") is payable
on April 15 and October 15 of each year, commencing April 15, 1997. The Senior
Notes will mature on October 15, 2006 and will not be redeemable prior to
maturity. The holder of each Senior Note may elect to have such Senior Note, or
any portion thereof that is an integral multiple of $1,000, repaid on October
15, 2001 at 100% of its principal amount, together with accrued interest to
October 15, 2001. Such election, which is irrevocable when made, must be made
within the period commencing August 15, 2001 and ending on the close of business
on September 15, 2001. See Description of Senior Notes.
    The Senior Notes will be represented by a Global Security registered in the
name of the nominee of The Depository Trust Company ("DTC"), which will act as
Depository. Beneficial interests in the Global Security will be shown on, and
transfers thereof will be effected only through, records maintained by DTC and
its direct and indirect participants. Except as described herein, Senior Notes
in definitive form will not be issued. See "Description of Senior
Notes--Book-Entry System".
 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. 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 Senior Note..........................      99.956%          0.500%           99.456%
Total....................................    $99,956,000       $500,000        $99,456,000
</TABLE>
 
(1) PLUS ACCRUED INTEREST, IF ANY, FROM OCTOBER 23, 1996 TO THE DATE OF
    DELIVERY.
(2) THE COMPANY HAS AGREED TO INDEMNIFY THE UNDERWRITERS AGAINST OR MAKE
    CONTRIBUTIONS RELATING TO CERTAIN LIABILITIES, INCLUDING LIABILITIES UNDER
    THE SECURITIES ACT OF 1933, AS AMENDED.
(3) BEFORE DEDUCTION OF ESTIMATED EXPENSES OF $150,000 PAYABLE BY THE COMPANY.
    The Senior Notes are offered severally by the Underwriters, subject to prior
sale, when, as and if issued to and accepted by the Underwriters, and subject to
approval of certain legal matters by counsel for the Underwriters and certain
other conditions. The Underwriters reserve the right to withdraw, cancel or
modify such offer and to reject orders in whole or in part. It is expected that
delivery of the Senior Notes will be made on or about October 23, 1996 in New
York, New York against payment therefor in immediately available funds.
DONALDSON, LUFKIN & JENRETTE
      SECURITIES CORPORATION
                              MORGAN STANLEY & CO.
                                     INCORPORATED
                                                               SMITH BARNEY INC.
 
          THE DATE OF THIS PROSPECTUS SUPPLEMENT IS OCTOBER 17, 1996.
<PAGE>
    IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVERALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE SENIOR NOTES
OFFERED HEREBY AT LEVELS ABOVE THOSE WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN
MARKET. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
 
                       RATIO OF EARNINGS TO FIXED CHARGES
 
    For the twelve-month period ended June 30, 1996 and the last five fiscal
years, the ratios of earnings to fixed charges of the Company, computed as set
forth below, were as follows:
<TABLE>
<CAPTION>
                                                                                         YEARS ENDED DECEMBER 31,
                                                          TWELVE MONTHS ENDED   ------------------------------------------
                                                             JUNE 30, 1996        1995       1994       1993       1992
                                                         ---------------------  ---------  ---------  ---------  ---------
<S>                                                      <C>                    <C>        <C>        <C>        <C>
Ratio of Earnings to Fixed Charges.....................             2.13             1.87       2.23       2.00       1.73
 
<CAPTION>
 
                                                           1991
                                                         ---------
<S>                                                      <C>
Ratio of Earnings to Fixed Charges.....................       2.34
</TABLE>
 
    The ratio of earnings to fixed charges represents the number of times fixed
charges are covered by earnings. For purposes of computing this ratio, earnings
consist of income before income taxes, plus fixed charges. Fixed charges consist
of interest expense (before allowance for borrowed funds used for construction),
amortization of debt issuance costs and such portion of rental expense which the
Company estimates to be representative of the interest factor attributable to
such rental expense.
 
                          DESCRIPTION OF SENIOR NOTES
 
    The following description of the particular terms of the Senior Notes
offered hereby supplements, and to the extent inconsistent therewith replaces,
the description of the general terms and provisions of Senior Notes as set forth
in the Prospectus.
 
GENERAL
 
    The Senior Notes will be issued under an Indenture, dated as of November 1,
1990, as supplemented by an Eighth Supplemental Indenture, dated as of October
1, 1996, between UtiliCorp United Inc. (the "Company" or "UtiliCorp") and The
First National Bank of Chicago, as Trustee (the "Trustee"), and will be limited
to $100,000,000 aggregate principal amount. The Senior Notes will be direct,
unsecured obligations of the Company and rank without preference or priority
among themselves and PARI PASSU with all existing and future unsecured and
unsubordinated indebtedness of the Company. The Senior Notes will mature on
October 15, 2006.
 
    The Senior Notes will bear interest from October 23, 1996 at the rate per
annum set forth on the cover page of this Prospectus Supplement, payable on
April 15 and October 15 of each year, commencing April 15, 1997, to the person
in whose name the Senior Note was registered at the close of business on the
preceding April 1 and October 1, respectively, subject to certain exceptions.
 
BOOK-ENTRY SYSTEMS
 
    DTC will act as securities depository for the Senior Notes. The Senior Notes
will be issued in fully-registered form in the name of Cede & Co. (DTC's
partnership nominee). One or more fully registered certificates will be issued
as Global Securities for the Senior Notes in the aggregate principal amount of
the Senior Notes, and will be deposited with DTC.
 
    DTC 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 Cede, and a "clearing agency"
registered pursuant to the provisions of Section 17A of the Securities Exchange
Act of 1934. DTC holds securities that its participants ("Direct Participants")
deposit with DTC. DTC also facilitates the settlement among Direct Participants
of securities transactions, such as transfers and pledges, in deposited
securities through electronic computerized book-entry changes in Direct
Participants'
 
                                      S-2
<PAGE>
accounts, thereby eliminating the need for physical movement of securities
certificates. Direct Participants include securities brokers and dealers, banks,
trust companies, clearing corporations, and certain other organizations. DTC 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 DTC 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" and together with Direct
Participants, "Participants"). The Rules applicable to DTC and its Participants
are on file with the Securities and Exchange Commission.
 
    Purchase of Senior Notes under the DTC system must be made by or through
Direct Participants, which will receive a credit for the Senior Notes on DTC's
records. The ownership interest of each actual purchaser of Senior Notes
("Beneficial Owner") is in turn to be received on the Participants' records.
Beneficial Owners will not receive written confirmation from DTC on their
purchases, but Beneficial Owners are expected to receive written confirmations
providing details of the transaction, as well as periodic statements of their
holdings, from the Participant through which the Beneficial Owner entered into
the transaction. Transfers of ownership interests in the Senior Notes are to be
accomplished by entries made on the books of Participants acting on behalf of
Beneficial Owners. Beneficial Owners will not receive certificates representing
their ownership interests in the Senior Notes except in the event that use of
the book-entry system for the Senior Notes is discontinued.
 
    To facilitate subsequent transfers, all Senior Notes deposited by Direct
Participants with DTC are registered in the name of DTC's partnership nominee,
Cede & Co. The deposit of Senior Notes with DTC and their registration in the
name of Cede & Co. effect no change in beneficial ownership. DTC has no
knowledge of the actual Beneficial Owners, of the Senior Notes; DTC's records
reflect only the identity of the Direct Participants to whose accounts such
Senior 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 DTC to Direct
Participants, by Direct Participants to Indirect Participants, and by
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 DTC nor Cede & Co. will consent or vote with respect to the Senior
Notes. Under its usual procedures, DTC would mail an Omnibus Proxy to the
Company as soon as possible after the record date. The Omnibus Proxy assigns
Cede & Co.'s consenting or voting rights to those Direct Participants to whose
accounts the Bonds are credited on the record date (identified in a listing
attached to the Omnibus Proxy).
 
    Principal and interest payments on the Senior Notes will be made to DTC.
DTC's practice is to credit Direct Participants' accounts on the payable date in
accordance with their respective holdings shown on DTC's records unless DTC has
reason to believe that it will not receive payment on the payable 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 DTC, the Company or the Trustee,
subject to any statutory or regulatory requirements as may be in effect from
time to time. Payment of principal and interest to DTC is the responsibility of
the Company or the Trustee, disbursement of such payments to Direct Participants
shall be the responsibility of DTC, and disbursements of such payments to the
Beneficial Owners shall be the responsibility of Participants.
 
    DTC may discontinue providing its service as securities depository with
respect to the Senior 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, Senior Note certificates are required to
be printed and delivered.
 
    The Company may decide to discontinue use of the system of book-entry
transfers through DTC (or a successor securities depository). In that event,
Senior Note certificates will be printed and delivered.
 
                                      S-3
<PAGE>
    The information in this section concerning DTC and DTC's book-entry system
has been obtained from sources that the Company believes to be reliable
(including DTC), but the Company takes no responsibility for the accuracy
thereof.
 
    Neither the Company, the Trustee nor the Underwriters will have any
responsibility or obligation to Participants, or the persons for whom they act
as nominees, with respect to the accuracy of the records of DTC, its nominee or
any Participant with respect to any ownership interest in the Senior Notes, or
payments to, or the providing of notice for Participants or Beneficial Owners.
 
REDEMPTION
 
    The Senior Notes will not be redeemable at the option of the Company prior
to maturity.
 
REPAYMENT AT OPTION OF HOLDER
 
    The Senior Notes will be repayable by the Company at the option of the
registered holders thereof on October 15, 2001, at 100% of their principal
amount, together with interest payable to the date of repayment. For any Senior
Note to be repaid, the Paying Agent (as defined in the Indenture) must have
received, during the period from and including August 15, 2001 to and including
the close of business on September 15, 2001 (or, if September 15, 2001 is not a
business day, the next succeeding business day), (a) appropriate wire
instructions and (b) either (i) the Senior Note with the form entitled "Option
to Elect Repayment" attached to the Senior Note duly completed or (ii) a
telegram, telex, facsimile transmission or letter from a member of a national
securities exchange or the NASD or a commercial bank or trust company in the
United States setting forth the name of the holder of the Senior Note, the
principal amount of the Senior Note, the portion of the principal amount of the
Senior Note to be repaid, the certificate number or a description of the tenor
and terms of the Senior Note, a statement that the option to elect repayment is
being exercised thereby and a guarantee that the Senior Note to be repaid with
the form entitled "Option to Elect Repayment" attached to the Senior Note duly
completed will be received by the Paying Agent not later than five business days
after the date of such telegram, telex, facsimile transmission or letter and
such Senior Note and form duly completed must be received by the Paying Agent by
such fifth business day. Any such election so received by the Paying Agent
within such period shall be irrevocable. The repayment option may be exercised
by the registered holder of a Senior Note for less than the entire principal
amount of such Senior Note, provided that the principal amount to be repaid is
equal to $1,000 or an integral multiple of $1,000. All questions as to the
validity, eligibility (including time of receipt) and acceptance of any Senior
Note for repayment will be determined by the Paying Agent, whose determination
shall be final and binding.
 
    As long as the Senior Notes are represented by a Global Security, a
Beneficial Owner shall give notice to elect to have its Senior Notes repaid,
through its Participant, to the Paying Agent, and shall effect delivery of such
Senior Notes by causing the Direct Participant to transfer the Participant's
interest in the Senior Notes, on DTC's records, to the Paying Agent. The
requirement for physical delivery of Senior Notes in connection with an exercise
of the repayment option will be deemed satisfied when the ownership rights in
the Senior Notes are transferred by Direct Participants on DTC's records and
followed by a book-entry credit of tendered Senior Notes to the Paying Agent's
account.
 
LIMITATION ON ISSUANCE OF MORTGAGE BONDS
 
    The Company has agreed not to issue any Mortgage Bonds under its General
Mortgage Indenture and Deed of Trust, dated September 15, 1988, between the
Company and Commerce Bank of Kansas City, N.A., as Trustee (the "General
Mortgage"), without directly securing the Senior Notes equally and ratably with
the Mortgage Bonds and all other obligations and indebtedness secured under the
General Mortgage. As of the date hereof, there are no Mortgage Bonds
outstanding.
 
                                USE OF PROCEEDS
 
    The net proceeds to be received by the Company from the sale of the Senior
Notes offered hereby will be used to reduce short-term debt previously incurred
for construction and acquisitions and for general corporate purposes. At
September 30, 1996, the Company had outstanding short-term debt (excluding
 
                                      S-4
<PAGE>
current maturities of long-term debt) of approximately $340.9 million with a
weighted average interest rate of 5.44%.
 
                              RECENT DEVELOPMENTS
 
TERMINATION OF MERGER AGREEMENT
 
    On September 17, 1996, Kansas City Power & Light Company ("KCPL") terminated
the Amended and Restated Agreement and Plan of Merger (the "Agreement") among
KCPL, KC Merger Sub, Inc., the Company and KC United Corp., which would have
provided for the merger of the Company and KCPL.
 
    Since KCPL's shareholders did not approve the merger between KCPL and the
Company, KCPL was required to pay the Company $5 million. The Company received
this termination payment on September 19, 1996. In connection with the
termination of the Agreement, the Company anticipates it will write off
approximately $11.0 million, net of the termination fee payment of deferred
merger costs against third quarter earnings.
 
                                  UNDERWRITING
 
    Subject to the terms and conditions set forth in the Underwriting Agreement
and the Pricing Agreement relating to the Senior Notes, each dated June 2, 1995,
the Company has agreed to sell to the several Underwriters named below (the
"Underwriters"), and the several Underwriters have agreed to purchase, the
principal amounts of the Senior Notes set forth opposite their names below:
 
<TABLE>
<CAPTION>
                                                                                  PRINCIPAL
UNDERWRITER                                                                         AMOUNT
- ------------------------------------------------------------------------------  --------------
<S>                                                                             <C>
Donaldson, Lufkin & Jenrette Securities Corporation...........................  $   34,000,000
Morgan Stanley & Co. Incorporated.............................................      33,000,000
Smith Barney Inc..............................................................      33,000,000
                                                                                --------------
    Total.....................................................................  $  100,000,000
                                                                                --------------
                                                                                --------------
</TABLE>
 
    The Underwriters have advised the Company that they propose initially to
offer the Senior 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 0.30% of the initial public offering
price of the Senior Notes. The Underwriters may allow, and such dealers may
reallow, a discount not in excess of 0.25% of the initial public offering price
of the Senior Notes to certain other dealers. After the initial public offering,
the public offering price, concession and discount may be changed.
 
    The Company has agreed to indemnify the Underwriters against or make
contributions relating to certain liabilities, including liabilities under the
Securities Act of 1933, as amended.
 
    The Senior Notes will not be listed on any securities exchange, and there
can be no assurance that there will be a secondary market for the Senior Notes.
From time to time, the Underwriters may make a market in the Senior Notes;
however, at this time no determination has been made as to whether the
Underwriters will make a market in the Senior Notes.
 
                                    EXPERTS
 
    The consolidated financial statements and schedules included in UtiliCorp's
Annual Report on Form 10-K for the years ended December 31, 1995, 1994 and 1993
which are incorporated by reference in this Prospectus Supplement, have been
audited by Arthur Andersen LLP, independent public accountants, as indicated in
their reports with respect thereto, and are incorporated herein in reliance upon
the authority of said firm as experts in giving said reports.
 
    The financial statements of United Energy included in the Company's Form
8-K/A, dated April 1, 1996, for the period May 11, 1994 to June 30, 1995, which
are incorporated by reference in this Prospectus Supplement have been audited by
Arthur Andersen LLP, independent public accountants, as indicated in their
report with respect thereto, and are incorporated herein in reliance upon the
authority of said firm as experts in giving said reports.
 
                                      S-5
<PAGE>
PROSPECTUS
                             UTILICORP UNITED INC.
                                  SENIOR NOTES
 
                               ------------------
 
    UtiliCorp  United Inc. (the "Company" or "UtiliCorp") may offer from time to
time up to $200,000,000 aggregate principal amount of its unsecured senior notes
(the "Securities")  on terms  to be  determined  at the  time of  offering.  The
specific  designation, aggregate principal  amount, maturity, rate  and times of
payment of interest, if  any, redemption and sinking  fund terms, if any,  other
specific  terms and any listing  on a securities exchange  of each series of the
Securities in respect of  which this Prospectus is  being delivered will be  set
forth  in a Prospectus  Supplement (the "Prospectus  Supplement"), together with
the terms  of offering  of the  Securities.  The terms  will be  established  by
negotiation or by competitive bid.
 
                            ------------------------
 
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 COM-MISSION
     PASSED UPON THE  ACCURACY OR  ADEQUACY OF THIS  PROSPECTUS.      ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
                            ------------------------
 
    The  Company  may sell  the Securities  in  any of  the following  ways: (i)
through underwriters or dealers; (ii) directly to a limited number of purchasers
or to  a single  purchaser;  or (iii)  through agents.  The  names of  any  such
underwriter  or agents and  any applicable commissions or  discounts will be set
forth in  an accompanying  Prospectus Supplement.  Pricing information  and  net
proceeds  to the Company from the sale of each series of Securities will also be
set forth in such Prospectus Supplement. See "Plan of Distribution" herein.
 
                            ------------------------
 
                  The date of this Prospectus is May 31, 1995.
<PAGE>
    NO PERSON IS AUTHORIZED IN CONNECTION WITH ANY OFFERING MADE HEREBY TO  GIVE
ANY  INFORMATION OR TO MAKE ANY REPRESENTATION NOT CONTAINED IN THIS PROSPECTUS,
AND, IF GIVEN  OR MADE, SUCH  INFORMATION OR REPRESENTATION  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 OFFERED HEREBY TO ANY PERSON IN ANY  JURISDICTION
IN  WHICH IT IS UNLAWFUL  TO MAKE SUCH AN OFFER  OR SOLICITATION TO SUCH PERSON.
NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL  UNDER
ANY  CIRCUMSTANCES CREATE ANY IMPLICATION  THAT THE INFORMATION CONTAINED HEREIN
IS CORRECT AS OF ANY DATE SUBSEQUENT TO THE DATE HEREOF.
                            ------------------------
 
                             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
Securities  and  Exchange  Commission (the  "Commission").  Such  reports, proxy
statements and other information  can be inspected and  copied at the Office  of
the Commission at 450 Fifth Street, N.W., Room 1024, Washington, D.C. 20549, and
at  the following Regional Offices of the  Commission: 7 World Trade Center, New
York, New York 10048 and 500 West Madison Street, Suite 1400, Chicago,  Illinois
60661. Copies of such material may be obtained from the Public Reference Section
of  the  Commission  at  450  Fifth Street,  N.W.,  Washington,  D.C.  20549, at
prescribed rates. Such reports, proxy statements and other information may  also
be inspected at the offices of the New York Stock Exchange, 20 Broad Street, New
York,  New York  10005, and  the Pacific  Stock Exchange,  301 Pine  Street, San
Francisco, California 94104.
 
                            ------------------------
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The following documents filed by the Company with the Commission pursuant to
the Exchange Act are incorporated in this Prospectus by reference:
 
    (a) The  Company's Annual  Report on  Form 10-K  for the  fiscal year  ended
       December 31, 1994; and
 
    (b)  The Company's Quarterly Report on Form 10-Q for the quarter ended March
       31, 1995.
 
    All documents filed by the Company  pursuant to Section 13(a), 13(c), 14  or
15(d) of the Exchange Act subsequent to the date of this Prospectus and prior to
the termination of this offering shall be deemed to be incorporated by reference
in  this  Prospectus and  to  be a  part  hereof from  the  date of  filing such
documents. Any statement contained  in a document incorporated  or deemed to  be
incorporated  by reference herein shall be  modified or superseded, for purposes
of this Prospectus, to the  extent that a statement  contained herein or in  any
subsequently  filed document  which is  deemed to  be incorporated  by reference
herein modifies  or supersedes  such  statement. Any  statement so  modified  or
superseded  shall  not  be  deemed,  except as  so  modified  or  superseded, to
constitute a part of this Prospectus.
 
    The Company hereby undertakes  to provide without charge  to each person  to
whom  a  copy of  this Prospectus  has been  delivered, on  the written  or oral
request of any such person,  a copy of any or  all of the documents referred  to
above  which have been or  may be incorporated in  this Prospectus by reference,
other than  exhibits to  such documents  unless such  exhibits are  specifically
incorporated  by reference into such documents. Such requests should be directed
to Mr. Dale J. Wolf, Vice President, Finance, Treasurer and Corporate Secretary,
UtiliCorp  United  Inc.,  911  Main,  P.O.  Box  13287,  Kansas  City,  Missouri
64199-3287, telephone number (816) 421-6600.
 
                                       2
<PAGE>
                                  THE COMPANY
 
    UtiliCorp  is  a  public utility  company  which supplies  electric  and gas
utility service through its seven operating divisions, Missouri Public  Service,
Peoples  Natural  Gas,  Kansas  Public  Service,  Northern  Minnesota Utilities,
Michigan Gas Utilities, West Virginia Power and WestPlains Energy, and through a
Canadian subsidiary,  West  Kootenay Power,  Ltd.  UtiliCorp also  holds  a  33%
interest   through  a  majority-owned  subsidiary  in  a  New  Zealand  electric
distribution company.  The Company  has two  non-regulated subsidiaries,  Aquila
Energy  Corporation and UtilCo Group Inc.,  which own utility and energy related
assets and engage in  energy related businesses. The  Company has its  Executive
Offices  at  911  Main,  P.  O. Box  13287,  Kansas  City,  Missouri 64199-3287,
telephone number (816)421-6600.
 
    The businesses of the Company  are seasonal, with electric revenues  peaking
in the summer and gas revenues peaking in the winter.
 
    The Company is actively seeking expansion through the prudent acquisition of
utility  and  other  energy  related  properties,  including  electric  and  gas
operating utilities,  interests  in  electric  generating  assets,  natural  gas
gathering systems and proven reserves.
 
                                USE OF PROCEEDS
 
    The  net  proceeds  to be  received  by the  Company  from the  sale  of the
Securities offered hereby will  be used to replace  maturing long-term debt,  to
reduce  outstanding  short-term debt  previously  incurred for  construction and
acquisitions and for general corporate purposes. At March 31, 1995, the  Company
had outstanding short-term borrowings (excluding current maturities of long-term
debt) of $229.4 million with a weighted average interest rate of 6.58%.
 
    As  discussed under  "The Company",  UtiliCorp is  actively seeking  to make
acquisitions of utility and other energy related properties. Such  acquisitions,
if  made, may require additional permanent  financings. The nature and amount of
such financings will  depend on, among  other things, market  conditions at  the
time of the financings.
 
                       RATIO OF EARNINGS TO FIXED CHARGES
 
    For  the twelve-month period ended  March 31, 1995 and  the last five fiscal
years, the ratios of earnings to fixed  charges of the Company, computed as  set
forth below, were as follows:
<TABLE>
<CAPTION>
                                                                                         YEARS ENDED DECEMBER 31,
                                                         TWELVE MONTHS ENDED    ------------------------------------------
                                                           MARCH 31, 1995         1994       1993       1992       1991
                                                       -----------------------  ---------  ---------  ---------  ---------
<S>                                                    <C>                      <C>        <C>        <C>        <C>
Ratio of Earnings to Fixed Charges...................           2.09                 2.21       1.99       1.73       2.27
 
<CAPTION>
 
                                                         1990
                                                       ---------
<S>                                                    <C>
Ratio of Earnings to Fixed Charges...................       2.02
</TABLE>
 
    The  ratio of earnings to fixed charges represents the number of times fixed
charges are covered by earnings. For purposes of computing this ratio,  earnings
consist of income before income taxes, plus fixed charges. Fixed charges consist
of interest expense (before allowance for borrowed funds used for construction),
amortization of debt issuance costs and such portion of rental expense which the
Company  estimates to be  representative of the  interest factor attributable to
such rental expense.
 
                           DESCRIPTION OF SECURITIES
 
    The following description of the terms of the Securities sets forth  certain
general  terms and provisions. The particular terms of the Securities offered by
any Prospectus Supplement (the "Offered Securities") will be described  therein.
The  Securities will be issued under an Indenture, dated as of November 1, 1990,
as supplemented (the "Indenture"),  between the Company  and The First  National
Bank  of Chicago, as Trustee (the "Trustee"), a copy of which is incorporated by
reference as an exhibit to  the Registration Statement. The following  summaries
of  certain provisions of  the Indenture do  not purport to  be complete and are
subject to, and are qualified in their entirety by
 
                                       3
<PAGE>
reference to, all  the provisions  of the Indenture,  including the  definitions
therein  of certain terms. Wherever particular  sections or defined terms of the
Indenture are referred to or used  herein, such sections or defined terms  shall
be incorporated herein by reference as part of the statements made.
 
GENERAL
 
    The  Indenture  does  not  limit  the  aggregate  principal  amount  of  the
Securities or  of  any particular  series  of  Securities which  may  be  issued
thereunder.  The Indenture provides  that Securities may be  issued from time to
time in one  or more  series. (Section 301).  The Securities  will be  unsecured
obligations  of the Company and  will rank on a  parity with all other unsecured
and unsubordinated indebtedness of the Company.
 
    Reference is made to  the Prospectus Supplement  relating to the  particular
series  of  Securities offered  thereby for  the  following terms  or additional
provisions of the Offered Securities: (1)  the title of the Offered  Securities;
(2)  any limit on the aggregate principal  amount of the Offered Securities; (3)
the price (expressed as a percentage of the aggregate principal amount  thereof)
at  which the Offered Securities will be issued;  (4) the date or dates on which
the Offered Securities will mature; (5) the rate or rates (which may be fixed or
variable) per annum at which the Offered Securities will bear interest, if  any;
(6)  the date from which  such interest, if any,  on the Offered Securities will
accrue, the dates on which such interest,  if any, will be payable, the date  on
which  payment of such interest, if any, will commence, the record dates for any
interest payment dates and the person,  if different than the registered  holder
as  of the record date, to whom any interest shall be payable; (7) the dates, if
any, on which  and the price  or prices  at which the  Offered Securities  will,
pursuant  to  any mandatory  sinking fund  provisions, or  may, pursuant  to any
optional sinking fund  provisions, be  redeemed by  the Company,  and the  other
detailed terms and provisions of such sinking funds; (8) the date, if any, after
which  and the price or prices at  which the Offered Securities may, pursuant to
any optional redemption provisions, be redeemed at the option of the Company  or
of  the  Holder thereof  and the  other  detailed terms  and provisions  of such
optional redemptions; (9) any  additional restrictive covenants included  solely
for the benefit of the Offered Securities; (10) any additional Events of Default
provided  solely with  respect to the  Offered Securities; (11)  the currency or
currencies in which the principal of (and premium, if any) and interest, if any,
on the  Offered  Securities  will be  payable;  (12)  the index,  if  any,  with
reference to which the amount of principal of (and premium, if any) or interest,
if  any, on  the Offered  Securities will be  determined; (13)  whether a Global
Security is to be issued with respect to the Offered Securities, the name of the
Depository for such Global Security and the terms, if any, upon which  interests
in  the Global Security may be  exchanged for definitive Offered Securities; and
(14) any additional terms of the Offered Securities.
 
    Unless otherwise  provided in  the Prospectus  Supplement relating  thereto,
principal  of (and premium, if any) and interest, if any, on the Securities will
be payable, and the transfer or exchange of the Securities will be  registrable,
at  the office or agency maintained by the Company for that purpose in New York,
New York, provided that, at  the option of the Company  interest may be paid  by
check  mailed to the address of the Person entitled thereto as it appears on the
Security Register. (Sections 301, 305 and 1002).
 
    Unless otherwise indicated  in the Prospectus  Supplement relating  thereto,
the  Securities will be  issued only in  registered form without  coupons and in
denominations of  $1,000  and  integral multiples  thereof.  (Section  302).  No
service  charge will be made for any registration of transfer or exchange of the
Securities, but the Company may require payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith. (Section 305).
 
    Securities may be issued as Original Issue Discount Securities to be sold at
a substantial discount below their principal amount. Special Federal income tax,
accounting and other considerations applicable thereto will be described in  the
Prospectus Supplement relating thereto. "Original Issue Discount Security" means
any  security which provides for the declaration of acceleration of the maturity
of an amount  less than  the principal amount  thereof upon  the occurrence  and
continuance of an Event of Default. (Section 101).
 
                                       4
<PAGE>
EVENTS OF DEFAULT
 
    An  Event of Default is defined in the Indenture, with respect to Securities
of any series, as: (a) a default in the payment of principal of (or premium,  if
any,  on) any  Security at  its Maturity; (b)  a default  in the  payment of any
interest on any Security when due, continued  for 30 days; (c) a default in  the
payment  of any  sinking fund instalment,  when and  as due; (d)  failure by the
Company for  60  days after  due  notice in  performance  of any  other  of  the
covenants  or warranties  in the  Indenture (other  than a  covenant or warranty
included in the Indenture solely for the benefit of a series of Securities other
than that series); (e)  a default under any  indebtedness for money borrowed  by
the  Company resulting  in such  indebtedness in  an aggregate  principal amount
exceeding $5,000,000 becoming due prior  to maturity, without such  acceleration
having  been  rescinded within  10  days after  due  notice of  such  default as
provided in  the Indenture;  (f)  certain events  of bankruptcy,  insolvency  or
reorganization  of the Company; and (g) any other Event of Default provided with
respect to Securities of that series. (Section 501).
 
    The Indenture  provides  that, if  any  Event  of Default  with  respect  to
Securities  of  any series  at the  time Outstanding  occurs and  is continuing,
either the Trustee or the  Holders of not less than  25% in principal amount  of
the  Outstanding Securities  of that  series may, by  notice as  provided in the
Indenture, declare the principal  amount (or, if the  Securities of that  series
are  Original Issue Discount Securities, such portion of the principal amount as
may be specified in the terms of  that series) of all Securities of that  series
to  be due and payable immediately, but upon certain conditions such declaration
may be annulled and past defaults  (except, unless theretofore cured, a  default
in  payment of  principal of (or  premium, if any)  or interest, if  any, on the
Securities of that series and certain other specified defaults) may be waived by
the Holders of a majority in  principal amount of the Outstanding Securities  of
that series on behalf of the Holders of all Securities of that series. (Sections
502 and 513).
 
    Reference  is made to  the Prospectus Supplement relating  to each series of
Offered  Securities  which  are  Original  Issue  Discount  Securities  for  the
particular  provisions relating to acceleration of  the Maturity of a portion of
the principal  amount  of  such  Original Issue  Discount  Securities  upon  the
occurrence of an Event of Default and the continuation thereof.
 
    The  Indenture  provides that  the Trustee  will, within  90 days  after the
occurrence of a default  with respect to  Securities of any  series at the  time
Outstanding,  give to the  Holders of the Outstanding  Securities of that series
notice of such default  known to it  if uncured or  not waived, provided,  that,
except  in the case  of default in the  payment of principal  of (or premium, if
any) or interest, if any, on any Security  of that series, or in the payment  of
any  sinking fund instalment which is provided, the Trustee will be protected in
withholding such  notice  if the  Trustee  in  good faith  determines  that  the
withholding  of such notice is in the interest of the Holders of the Outstanding
Securities of such series; and, provided further, that such notice shall not  be
given  until  30  days  after  the  occurrence  of  a  default  with  respect to
Outstanding Securities of  any series in  the performance of  a covenant in  the
Indenture other than for the payment of the principal of (or premium, if any) or
interest,  if any, on any Security of such  series or the deposit of any sinking
fund instalment with respect to the Securities of such series. The term  default
with  respect to any  series of Outstanding  Securities for the  purpose only of
this provision means the happening of any of the Events of Default specified  in
the  Indenture and relating to such  series of Outstanding Securities, excluding
any grace periods and irrespective of any notice requirements. (Section 602).
 
    The Indenture contains  a provision  entitling the Trustee,  subject to  the
duty of the Trustee during default to act with the required standard of care, to
be  indemnified by  the Holders of  any series of  Outstanding Securities before
proceeding to exercise any right or power under the Indenture at the request  of
the  Holders of such series of Securities. (Section 603). The Indenture provides
that the Holders of a majority in principal amount of Outstanding Securities  of
any  series may direct the  time, method and place  of conducting any proceeding
for any remedy available to the Trustee, or exercising any trust or other  power
conferred  on the Trustee, provided that the  Trustee may decline to act if such
direction is contrary to law or the Indenture. (Section 512).
 
                                       5
<PAGE>
    The Indenture includes a covenant that  the Company will file annually  with
the  Trustee a certificate of no default, or specifying any default that exists.
(Section 1007).
 
DEFEASANCE
 
    The Indenture  provides  that  the  Company, at  its  option,  (a)  will  be
discharged  from any and all obligations  with respect to the Securities (except
for certain obligations which  include registering the  transfer or exchange  of
the  Securities,  replacing stolen,  lost  or mutilated  Securities, maintaining
paying agencies and holding monies for payment in trust) or (b) need not  comply
with  certain restrictive covenants of the  Indenture, upon the deposit with the
Trustee (and in the case of a discharge, 91 days after such deposit), in  trust,
of  money,  or  U.S. Government  Obligations,  or a  combination  thereof, which
through the payment of interest thereon and principal thereof in accordance with
their terms will provide money, in an amount sufficient to pay all the principal
of and  interest  on  the Securities  on  the  date such  payments  are  due  in
accordance with the terms of the Securities to their stated maturities or to and
including a redemption date which has been irrevocably designated by the Company
for  redemption of the Securities.  To exercise any such  option, the Company is
required to  meet certain  conditions, including  delivering to  the Trustee  an
opinion  of counsel to the effect that  the deposit and related defeasance would
not cause the Holders of  the Securities to recognize  income, gain or loss  for
federal income tax purposes. (Sections 403 and 1008).
 
MODIFICATION OF THE INDENTURE
 
    The  Indenture contains provisions  permitting the Company  and the Trustee,
with the consent of the Holders of not less than 66 2/3% in principal amount  of
each  series of Outstanding Securities affected  thereby (voting as a class), to
execute  supplemental  indentures  adding  any  provisions  to  or  changing  or
eliminating  any of the provisions  of the Indenture or  modifying the rights of
the Holders  of Outstanding  Securities  of such  series,  except that  no  such
supplemental  indenture may (a) change the  Stated Maturity of any Security, (b)
reduce the principal amount of, or the  rate of interest or any premium on,  any
Security,  (c) change  the place  or currency  of payment  on any  Security, (d)
impair the right  to institute suit  for the  enforcement of any  payment on  or
after  the Stated  Maturity thereof, (e)  reduce the  above-stated percentage of
Outstanding Securities necessary to modify or amend the Indenture, or (f) reduce
the percentage of aggregate principal amount of Outstanding Securities necessary
for waiver of  compliance with certain  provisions of the  Indenture or for  the
waiver of certain covenants and defaults. (Section 902).
 
CONSOLIDATION, MERGER AND SALE OF ASSETS
 
    The  Indenture  contains a  provision  permitting the  Company,  without the
consent of the Holders of any of the Outstanding Securities under the Indenture,
to consolidate with or merge into any other corporation or transfer or lease its
assets substantially as an  entirety to any  Person or to  acquire or lease  the
assets  of any Person substantially as an  entirety or to permit any corporation
to merge into  the Company, provided  that: (i) the  successor is a  corporation
organized  under  the  laws of  any  domestic jurisdiction;  (ii)  the successor
corporation, if other than the Company, assumes the Company's obligations on the
Securities and  under  the Indenture;  and  (iii)  after giving  effect  to  the
transaction,  no Event of Default, and no  event which, after notice or lapse of
time, would become an Event of  Default, shall have occurred and be  continuing.
(Section 801).
 
    Unless  otherwise  indicated in  the Prospectus  Supplement, certain  of the
covenants described above would not necessarily afford the Holders protection in
the event of  a highly leveraged  transaction involving the  Company, such as  a
leveraged  buyout. However, issuance of debt  securities by the Company requires
regulatory approval.
 
OUTSTANDING SECURITIES
 
    The Indenture  provides that,  in  determining whether  the Holders  of  the
requisite  principal amount  of Outstanding  Securities have  given any request,
demand, authorization, direction, notice, consent or waiver under the Indenture,
(i) the portion of the principal  amount of an Original Issue Discount  Security
that  shall be deemed to be Outstanding  for such purposes shall be that portion
of the principal amount  thereof that could  be declared to  be due and  payable
upon the occurrence of an
 
                                       6
<PAGE>
Event  of Default  and the  continuation thereof pursuant  to the  terms of such
Original Issue Discount Security as of the date of such determination, and  (ii)
Securities  owned by the Company or any of its Affiliates shall not be deemed to
be Outstanding. (Section 101).
 
REGARDING THE TRUSTEE
 
    The Company  has  a bank  line  of credit  with  the Trustee  and  maintains
depository and other banking relationships with the Trustee.
 
                              PLAN OF DISTRIBUTION
 
    The  Company  may sell  the Securities  in  any of  the following  ways: (i)
through underwriters or dealers; (ii) directly to a limited number of purchasers
or to a  single purchaser; or  (iii) through agents.  The Prospectus  Supplement
with  respect to the series  of Securities being offered  thereby will set forth
the terms of the offering of such Securities, including the name or names of any
underwriters, the purchase  price of  such Securities  and the  proceeds to  the
Company  from such sale, any underwriting discounts and other items constituting
underwriters' compensation, any initial public offering price and any  discounts
or  concessions  allowed or  reallowed  or paid  to  dealers and  any securities
exchanges on which such Securities may be listed.
 
    If underwriters  are  used in  the  sale of  a  series of  Securities,  such
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 a fixed public offering  price or at varying prices  determined
at  the time of sale. The Securities may be either offered to the public through
underwriting syndicates  (which  may  be represented  by  managing  underwriters
designated  by  the Company),  or directly  by one  or more  underwriters acting
alone. Unless otherwise set forth in the Prospectus Supplement, the  obligations
of  the underwriters  to purchase the  Securities of the  series offered thereby
will be subject to  certain conditions precedent, and  the underwriters will  be
obligated  to purchase  all such  Securities if  any are  purchased. Any initial
public offering price and any discounts  or concessions allowed or reallowed  or
paid to dealers may be changed from time to time.
 
    Securities  may be sold directly by the Company or through agents designated
by the Company from time to time. The Prospectus Supplement with respect to  any
series  of Securities sold in  this manner will set forth  the name of any agent
involved in  the offer  or sale  of such  series of  Securities as  well as  any
commissions  payable by the Company to such agent. Unless otherwise indicated in
the Prospectus Supplement, any such agent is acting on a best efforts basis  for
the period of its appointment.
 
    If dealers are utilized in the sale of any series of Securities, the Company
will  sell such  Securities to  the dealers, as  principal. Any  dealer may then
resell such Securities to the public at varying prices to be determined by  such
dealer  at the  time of  resale. The  name of  any dealer  and the  terms of the
transaction will be set forth in  the Prospectus Supplement with respect to  the
Securities being offered thereby.
 
    It  has not  been determined  whether any series  of the  Securities will be
listed on  a  securities exchange.  Underwriters  intend  to, but  will  not  be
obligated  to, make  a market  in any series  of Securities.  The Company cannot
predict the  activity  of  trading  in,  or liquidity  of,  any  series  of  the
Securities.
 
    Agents,  underwriters and dealers may  be entitled, under agreements entered
into with the Company, to indemnification  by the Company against certain  civil
liabilities, including liabilities under the Securities Act of 1933, as amended,
or  to contribution with  respect to payments which  the agents, underwriters or
dealers may be  required to make  in respect thereof.  Agents, underwriters  and
dealers  may be customers  of, engage in transactions  with, or perform services
for the Company in the ordinary course of business.
 
                                       7
<PAGE>
                                 LEGAL OPINIONS
 
    The legality  of the  Securities will  be  passed upon  for the  Company  by
Blackwell  Sanders Matheny Weary & Lombardi L.C., Two Pershing Square, 2300 Main
Street, Kansas City, Missouri 64108, and for the underwriter(s), purchaser(s) or
agent(s) by Milbank, Tweed, Hadley & McCloy, 1 Chase Manhattan Plaza, New  York,
New York 10005. Milbank, Tweed, Hadley & McCloy from time to time provides legal
services to the Company.
 
                                    EXPERTS
 
    The  consolidated financial statements and schedules included in UtiliCorp's
Annual Report on Form 10-K for the years ended December 31, 1994, 1993 and  1992
which  are incorporated  by reference in  this Prospectus, have  been audited by
Arthur Andersen  LLP,  independent public  accountants,  as indicated  in  their
reports  with respect thereto, and are  incorporated herein in reliance upon the
authority of said firm as experts in giving said reports.
 
                                       8
<PAGE>
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    NO DEALER, SALESPERSON OR OTHER 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 IN
CONNECTION WITH THE OFFER MADE BY THIS PROSPECTUS SUPPLEMENT AND THE PROSPECTUS
AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED
UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY OR THE UNDERWRITERS. NEITHER THE
DELIVERY OF THIS PROSPECTUS SUPPLEMENT AND THE PROSPECTUS NOR ANY SALE MADE
HEREUNDER AND THEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE AN IMPLICATION
THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY SINCE THE DATE
HEREOF. THIS PROSPECTUS SUPPLEMENT AND THE PROSPECTUS DO NOT CONSTITUTE AN OFFER
OR SOLICITATION BY ANYONE IN ANY JURISDICTION IN WHICH SUCH OFFER OR
SOLICITATION IS NOT AUTHORIZED OR IN WHICH THE PERSON MAKING SUCH OFFER OR
SOLICITATION IS NOT QUALIFIED TO DO SO OR TO ANYONE TO WHOM IT IS UNLAWFUL TO
MAKE SUCH OFFER OR SOLICITATION.
 
                                 --------------
 
                               TABLE OF CONTENTS
                             PROSPECTUS SUPPLEMENT
 
<TABLE>
<CAPTION>
                                                   PAGE
 
<S>                                              <C>
Ratio of Earnings to Fixed Charges.............        S-2
Description of Senior Notes....................        S-2
Use of Proceeds................................        S-4
Recent Developments............................        S-5
Underwriting...................................        S-5
Experts........................................        S-5
 
                        PROSPECTUS
 
Available Information..........................          2
Incorporation of Certain Documents by
 Reference.....................................          2
The Company....................................          3
Use of Proceeds................................          3
Ratio of Earnings to Fixed Charges.............          3
Description of Securities......................          3
Plan of Distribution...........................          7
Legal Opinions.................................          8
Experts........................................          8
</TABLE>
 
                                  $100,000,000
 
                             UTILICORP UNITED INC.
 
                          6.70% SENIOR NOTES DUE 2006
 
                           -------------------------
 
                             PROSPECTUS SUPPLEMENT
 
                         ------------------------------
 
                          DONALDSON, LUFKIN & JENRETTE
      SECURITIES CORPORATION
                              MORGANSTANLEY & CO.
      INCORPORATED
                               SMITH BARNEY INC.
 
                                OCTOBER 17, 1996
 
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