AIM ADVISOR FUNDS INC
N-30D, 1998-03-06
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<PAGE>   1
                             AIM ADVISOR FLEX FUND



[AIM LOGO APPEARS HERE]         ANNUAL REPORT                  DECEMBER 31, 1997

<PAGE>   2
                    ---------------------------------------

                              AIM ADVISOR FLEX FUND

                            For shareholders who seek

                         to achieve a high total return

                              on investment through

                          investments in a combination

                       of equity securities and fixed and

                          variable income securities.

                    ---------------------------------------


                                  [COVER PHOTO
                                 APPEARS HERE]

ABOUT FUND PERFORMANCE AND PORTFOLIO DATA THROUGHOUT THIS REPORT:

o   AIM Advisor Flex Fund's performance figures are historical and reflect
    reinvestment of all distributions and changes in net asset value. Unless
    otherwise indicated, the fund's performance is computed at net asset value
    without a sales charge.
o   When sales charges are included in performance figures, Class A share
    performance reflects the maximum 5.50% sales charge, and Class C share
    performance reflects the 1% contingent deferred sales charge, which is
    applicable for 12 months following the date of each purchase. The
    performance of the Fund's Class A and Class C shares will differ due to
    differing fees and expenses.
o   During 1997, the Fund paid distributions of $0.93 and $0.79 per share to
    Class A and Class C shares, respectively. 
o   The Fund's investment return and principal value will fluctuate so that an
    investor's shares, when redeemed, may be worth more or less than their
    original cost.
o   Past performance cannot guarantee comparable future results.

ABOUT INDEXES AND OTHER PERFORMANCE BENCHMARKS CITED IN THIS REPORT:

o   The Standard & Poor's Composite Index of 500 Stocks (S&P 500) is a group of
    unmanaged securities widely regarded by investors to be representative of
    the stock market in general.
o   The Dow Jones Industrial Average (DJIA) is a price-weighted average of 30
    actively traded primarily industrial stocks. 
o   The unmanaged Lipper Flexible Portfolio Fund Index represents an average of
    the performance of the 30 largest funds in the flexible portfolio fund
    category. It is compiled by Lipper Analytical Services, Inc., an independent
    mutual funds performance monitor. Results shown reflect reinvestment of
    dividends.
o   The Lehman Brothers Aggregate Bond Index is an unmanaged index generally
    considered representative of corporate debt securities.
o   The NASDAQ (National Association of Securities Dealers Automated Quotation
    system) Composite Index is a group of more than 4,500 unmanaged
    over-the-counter securities widely regarded by investors to be
    representative of the small- and medium-sized company stock universe.
o   An investment cannot be made in any index listed. Unless otherwise
    indicated, index results include reinvested dividends and do not reflect
    sales charges.

                 MUTUAL FUNDS, ANNUITIES, AND OTHER INVESTMENTS
           ARE NOT INSURED BY THE FDIC OR ANY OTHER GOVERNMENT AGENCY;
           ARE NOT DEPOSITS OR OTHER OBLIGATIONS OF, OR GUARANTEED BY,
         ANY BANK OR ANY AFFILIATE; AND ARE SUBJECT TO INVESTMENT RISKS,
              INCLUDING POSSIBLE LOSS OF PRINCIPAL AMOUNT INVESTED.

           This report may be distributed only to current shareholders
        or to persons who have received a current prospectus of the Fund.
<PAGE>   3


                                                           The Chairman's Letter

                    Dear Fellow Shareholder:

                    1997 proved an eventful year in securities markets. The Dow
   [PHOTO OF        Jones Industrial Average reached its all-time high--and also
  Charles T.        had its largest one-day point drop ever, though not its
    Bauer,          largest percentage drop. Volatility was unabated, and we
 Chairman of        experienced the first 10% stock market correction in the
 the Board of       U.S. since 1991.
   THE FUND             Never dull and occasionally unsettling, 1997 was also a
 APPEARS HERE]      very good year for many investments. For an unprecedented
                    third year in a row, domestic equities rose more than 20%.
                    Late in the year, in the uncertainty brought on by events in
                    Asia, bond markets, especially the U.S. Treasury market,
                    fulfilled their usual role as relative safe havens, and a
                    bull market in bonds took hold. Overseas, though Asian
                    markets plummeted, Europe thrived.
                        Market expectations performed an about-face during the
year. Worry about the inflationary potential of vigorous economic growth became
concern about the potential negative impact of Asia's financial crisis. At
fiscal year end, there was no consensus about how serious or widespread this
impact would be.
    An interview with your Fund's managers appears on the following pages. They
discuss their investment strategies, how your Fund performed in this context,
and their outlook for the future.
    In uncertain times like these, your financial consultant remains your best
source for information on market trends and for advice on how to invest
strategically rather than emotionally. We encourage you to visit your financial
consultant regularly to make sure your chosen investments still suit your goals,
risk tolerance, and time horizon.

INVESTOR EDUCATION EVENTS
In addition to professional guidance, every investor needs fundamental
information about the saving and investing choices offered by the marketplace.
AIM has always championed investor education, convinced a more knowledgeable
shareholder is a better customer. A great deal of investment information will be
available during two upcoming events, and we hope our shareholders will
participate in and learn from them to the greatest extent possible.
    First, from March 29 through April 4, the Securities and Exchange Commission
(SEC) will sponsor Saving and Investing Education Week. As the SEC points out,
financial markets are more stable when investors are confident in them, and
knowledge is a major confidence builder. The week's theme is "Get the facts.
It's your money. It's your future." The aim is to inform citizens about the
saving and investment possibilities available and to build understanding about
how one's financial needs and goals change throughout one's life. The week's
awareness and education events will culminate with a national investors town
meeting at satellite-linked locations across the nation. You can find out more
from the SEC's Web site at www.sec.gov.
    The second event concerns citizens' financial planning for retirement, a
subject of growing urgency as the population ages and the solvency of the Social
Security system is increasingly debatable. In July, the first National Summit on
Retirement Savings will be held at the White House. Under the auspices of the
Department of Labor, working through public-private partnership, the summit's
goal is to advance the public's knowledge of retirement savings through
development of a broad-based education program and to develop recommendations
for public/private action to promote private retirement savings among American
workers.
    Look for further information on both of these investor education events in
the national and local press. 
   We are pleased to send you this report on your Fund. Please contact our
Client Services department at 800-959-4246 if you have questions or comments.
Automated information about your account is available 24 hours a day on the AIM
Investor Line, 800-246-5463. Account information and much more can be found on
our Web site, www.aimfunds.com.

Sincerely,

/s/ CHARLES T. BAUER

Charles T. Bauer
Chairman

                      -------------------------------------

                         In uncertain times like these,

                            your financial consultant

                            remains your best source

                        for information on market trends

                                and for advice on

                           how to invest strategically

                            rather than emotionally.

                      -------------------------------------


                                       2
<PAGE>   4
The Managers' Overview

ASSET ALLOCATION DISCIPLINE PRODUCES
IMPRESSIVE RETURNS IN CHANGING MARKET

A roundtable discussion with the portfolio management team for AIM Advisor Flex
Fund for the fiscal year ended December 31, 1997.
- --------------------------------------------------------------------------------
Q.  1997 WAS A TURBULENT YEAR IN THE SECURITIES MARKETS. HOW DID THE FUND
    PERFORM IN THIS ENVIRONMENT? 

A.  The Fund turned in excellent performance despite unusual volatility and a 
    major correction in the equity markets. It considerably outperformed the
    Lipper Flexible Portfolio Funds Index of comparable funds. For the year,
    total return at net asset value was 24.60% for Class A shares and 23.64% for
    Class C shares. By contrast, the Lipper Flexible Portfolio Funds Index
    reported total return of 18.77% for the same period.
================================================================================
Year ended 12/31/97

FUND CLASS A SHARES                     24.60%

FUND CLASS C SHARES                     23.64%

LIPPER FLEXIBLE PORTFOLIO INDEX         18.77%
================================================================================

Q.  HOW WOULD YOU DESCRIBE MARKET CONDITIONS DURING THE FISCAL YEAR?

A.  Market expectations shifted 180 degrees during the year. As the year opened,
    many expected the Federal Reserve Board (the Fed) to raise interest rates to
    slow a robust and possibly inflationary economic expansion. By fiscal year
    end, potential deflation had emerged as a topic of public deliberation and
    the consensus was that the Fed would either do nothing or lower rates at its
    next meeting. The Asian financial crisis, caused by debt default worries in
    that region, accounted for much of this change in sentiment because of the
    pronounced uncertainty it caused in markets worldwide.

Q.  WHAT EFFECT DID THIS CHANGE AND UNCERTAINTY HAVE ON SECURITIES MARKETS?

A.  The net result was that for the year as a whole, large-capitalization stocks
    again dominated the markets. For a while during the summer and early fall,
    investors began to look beyond these stocks, but in the wake of events in
    Asia, they retreated to more familiar, more liquid large-capitalization
    stocks late in the year. During the last quarter of 1997, the S&P 500 stocks
    rose almost 3% in value while NASDAQ small-company stocks declined almost
    7%. Overall, it was a very good year for stocks. Total return for the S&P
    500 was 33.35%.
         In addition to leading investors back into the large-cap universe, 
    market turmoil also increased the attractiveness of less risky investments
    such as Treasury bonds. A bond rally late in the year pushed the yield on
    the 30-year U.S. Treasury bond below 6%, its lowest level in more than four
    years. Bond performance was quite good for the fiscal year; the Lehman
    Brothers Aggregate Bond Index's total return was 9.65%, a respectable
    showing for bonds. In the course of the year, the yield curve flattened
    dramatically. The spread between a two-year Treasury and a 30-year Treasury
    narrowed from 77 to 28 basis points (a basis point is one one-hundredth of a
    percentage point).

Q.  HOW DID YOU MANAGE THE PORTFOLIO IN THIS ENVIRONMENT?

A.  When the fiscal year opened, approximately 66% of the portfolio consisted of
    stocks. By fiscal year end, that figure was up to a fairly high 76.7%, which
    was largely due to a dramatic decline in interest rates and somewhat soft
    stock prices during the fourth quarter.
         Our asset allocation decisions are based upon the expected return on
    stock investments compared to the expected earnings on bond investments.
    Historically, the spread between the expected return on stocks and the
    expected return on longer-term bonds has averaged about 3%. When that spread
    widens, the Fund gradually shifts the portfolio to emphasize stocks. This
    larger exposure to the equity market contributed greatly to the Fund's
    excellent total return for the year.
         Once the asset allocation has been settled, we use a value-driven
    individual stock-selection process on the equity side and a
    quality-oriented, volatility-averse bond selection method for the
    fixed-income side.

Q.  WERE THERE PARTICULAR STOCKS OR SECTOR WEIGHTINGS THAT HELPED PERFORMANCE?

A.  The Fund benefited from large exposure to financial stocks, including banks,
    brokerage houses, and insurance firms. The financial sector was the year's
    best performer among the Dow Jones U.S. industry 

                      ------------------------------------

                       Once the asset allocation has been

                         settled, we use a value-driven

                       individual stock-selection process

                            on the equity side and a

                       quality-oriented, volatility-averse

                              bond selection method

                           for the fixed-income side.

                      ------------------------------------

          See important Fund and index disclosures inside front cover.

                                       2
<PAGE>   5
TOP HOLDINGS

As of 12/31/97, based on total net assets

<TABLE>
<CAPTION>
==========================================================================================================================
TOP 10 HOLDINGS                                                  TOP 10 INDUSTRIES
- --------------------------------------------------------------------------------------------------------------------------
<S>                                                 <C>          <C>                                                 <C>
1.  Morgan Stanley, Dean Witter, Discover & Co.     1.71%        1.  Oil (International Integrated)                  4.39%

2.  Merck & Co., Inc.                               1.69         2.  Telephone                                       4.35

3.  International Business Machines Corp.           1.67         3.  Electric Companies                              4.18

4.  First Chicago NBD Corp.                         1.66         4.  Manufacturing (Diversified)                     4.14

5.  First of America Bank Corp.                     1.66         5.  Computers (Hardware)                            4.01

6.  Entergy Corp.                                   1.43         6.  Health Care (Drugs-Major Pharmaceuticals)       3.79

7.  Electronic Data Systems Corp.                   1.40         7.  Banks (Major Regional)                          3.16

8.  Unilever N.V.                                   1.39         8.  Computers (Software & Services)                 2.66

9.  Royal Dutch Petroleum Co.                       1.38         9.  Financial (Diversified)                         2.65

10. Ford Motor Co.                                  1.36         10. Foods                                           2.40

Please keep in mind that the Fund's portfolio is subject to change and there is
no assurance the Fund will continue to hold any particular security.
==========================================================================================================================
</TABLE>

    groups. Our financial holdings constituted close to 10% of the portfolio at
    fiscal year end.
         The growing economy and stable interest rates have helped financial
    firms to prosper, and demographic trends are pushing more and more people
    into retirement-oriented financial planning. The financial sector also is
    experiencing a wave of mergers and acquisitions such as the ones that
    produced portfolio holding Morgan Stanley, Dean Witter, Discover & Co.
    Financial firms want to be capable of offering the broadest possible range
    of services to clients and of competing in a global environment.
         Our technology stocks were superb performers. In fact, this is an area
    where our stock selections significantly outperformed the tech stocks
    included in the S&P 500 index. Among the good performers were Computer
    Associates International, Inc., a leading vendor of software that is used to
    solve the so-called "millennium problem" of reprogramming older computers to
    recognize the year 2000; and International Business Machines Corp., whose
    stock price was up significantly during 1997.

Q.  YOUR BOND HOLDINGS ARE DOMINATED BY U.S. TREASURY NOTES. WHY IS THAT?

A.  Largely, this reflects our quality strategy. Late in 1997, we would have
    picked up a mere 50 basis points or so in yield by moving into
    mortgage-backed securities, corporate bonds, or other alternative
    fixed-income investments. It wasn't worth the sacrifice in quality. This is
    a rather conservatively managed portfolio that aims at protecting
    shareholders' capital; we try to manage volatility in the bond holdings by
    keeping an intermediate duration.

PORTFOLIO COMPOSITION

As of 12/31/97, based on total net assets
================================================================================
Number of Holdings:                                         111
- --------------------------------------------------------------------------------
Non-Convertible bonds, cash/cash equivalents, & other      3.64%
U. S. Government Securities                               19.64%
Common Stock                                              76.72%
================================================================================

Q.  DID THE MARKET DECLINE IN ASIA HAVE A NEGATIVE IMPACT ON THE FUND?

A.  No. For example, Compaq Computer Corp. was the portfolio holding most 
    negatively affected by the market turmoil in Asia, and we had already pared
    our holdings of it because of portfolio composition considerations--we
    adjust our holdings to assure sufficient diversification in the portfolio, a
    key strategy for managing volatility. In addition, the foreign securities in
    the portfolio tend to be more mature global concerns domiciled in Europe
    such as Unilever N.V. and Royal Dutch Petroleum Co. 
         In fact, we used the October downturn in the equity markets to add to
    our stock holdings.

Q.  WHAT IS YOUR OUTLOOK FOR THE NEXT FEW MONTHS?

A.  In the U.S., the economic fundamentals are sound: inflation is low,
    corporate profits are strong, and the economy is growing at a healthy pace.
    These are just about ideal conditions for both stocks and bonds.
         For now, our model supports a high allocation to equities. But we have
    had three years of unprecedented returns on equity investments, and we doubt
    that this can persist. Continuing problems in Asia could slow economic
    growth worldwide, reducing corporate profits and stock returns. The same
    conditions could add fuel to the ongoing strong rally in the U.S. bond
    market. Should the performance differential between these two asset classes
    change significantly, we are always prepared to adjust the Fund's
    allocations.

          See important Fund and index disclosures inside front cover.


                                        3
<PAGE>   6
Long-Term Performance

AIM ADVISOR FLEX FUND VS. BENCHMARK INDEXES

The charts compare your Fund's Class C shares to benchmark indexes. An index
measures the performance of a hypothetical portfolio. In compliance with
Securities and Exchange Commission regulations we compare your Fund to a broad
market index, the S&P 500, which is not managed and therefore involves no sales
charges, expenses, or fees. If you could buy all of the securities that make up
a particular market index, you would incur expenses that would affect the return
on your investment. It is important to note that the S&P 500 is representative
of the stock market only while a portion of AIM Advisor Flex Fund is invested in
the bond market. The second chart compares your Fund's Class C shares to a group
of comparable funds included in the Lipper Flexible Portfolio Fund Index. We
believe this comparison is more representative of the performance you can
realistically expect of your Fund. Keep in mind that an index of funds includes
a number of mutual funds grouped by investment objective. Each of these funds
interprets that objective differently, and each employs a different management
style and investment strategy. Use of these indexes is intended to give you a
general idea of how your Fund performed compared to these indexes. Taken by
itself, this information cannot determine whether a Fund is suitable for any
investor's particular circumstances.


GROWTH OF A $10,000 INVESTMENT
2/24/88 - 12/31/97
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------
               AIM ADVISOR FLEX FUND, CLASS C SHARES    S&P'S 500 STOCK INDEX     LIPPER FLEXIBLE PORTFOLIO FUND INDEX
               $31,919                                  $48,885                   $30,101
- ----------------------------------------------------------------------------------------------------------------------
<S>             <C>                                      <C>                       <C>
2/24/88         $10,000                                  $10,000                   $10,000

12/31/88         10,357                                   10,885                    10,324

12/31/89         12,143                                   14,324                    12,104

12/31/90         11,941                                   13,878                    12,217

12/31/91         14,901                                   18,088                    15,510

12/31/92         16,053                                   19,464                    16,388

12/31/93         17,736                                   21,417                    18,474

12/31/94         17,850                                   21,708                    17,980

12/31/95         22,723                                   29,836                    22,223

12/31/96         25,816                                   36,668                    25,344

12/31/97         31,919                                   48,885                    30,101
======================================================================================================================
</TABLE>
Past performance cannot guarantee comparable future results.
================================================================================
Average Annual Total Returns
For periods ended 12/31/97, including applicable sales charges
- --------------------------------------------------------------------------------
CLASS C SHARES

   1 Year                            22.64%
   5 Years                           14.74
Inception (2/24/88)                  12.50

CLASS A SHARES

   1 Year                            17.73%
================================================================================

Sources: Towers Data Systems HYPO--Registered Trademark--. Your Fund's total 
return includes applicable sales charges, expenses, and management fees. The
performance of the Fund's Class A shares will differ from that of Class C shares
due to differing fees and expenses. For Fund performance calculations and
descriptions of indexes cited on this page, please refer to the inside front
cover.


                                       4
<PAGE>   7
                                                               For Consideration

THE ROTH IRA: THE POWER TO KEEP MORE

Contribute After-Tax Dollars Now . . . So You Can Get Federally Tax-Free Savings
Later

A new and potentially more powerful type of IRA--the Roth IRA--became available
on January 1, 1998. What makes it more powerful? The Roth IRA gives you the 
opportunity to keep more of what you earn.
   Are you eligible to open a Roth IRA? The answer is yes if you or your spouse
has earned income for the tax year for which you want to make the contribution,
and your adjusted gross income is below $110,000 if you are a single tax filer,
$160,000 if you file jointly.

TWO KEY ROTH IRA BENEFITS:
TAX-FREE AND PENALTY-FREE WITHDRAWALS

o   Of earnings after five years. Earnings on your Roth IRA are federally
tax-free if your Roth IRA account has been open for five years and you are at
least 59 1/2 years old, or in the case of death or disability. You may also use
up to $10,000 of your earnings to buy a first home (after five years).

o   Of contributions at any time. For instance, if you make annual contributions
of $2,000 for the next three years, you may take out up to $6,000 and use that
money for any purpose.

HOW YOU MIGHT PUT BOTH BENEFITS TO WORK FOR YOU

Here's an example of how you may take full advantage of a Roth IRA. You are
39-1/2 years old. You contribute $2,000 after-tax annually in your Roth IRA
every year for 20 years, earning an average annual return of 10%. After 20
years, your account has grown to $126,005. Now at age 59-1/2 you can begin
taking withdrawals and pay no federal income tax or penalty on any of your
$126,005. Or you can keep your money invested and take it out whenever you need
it.

THE ROTH IRA: TO CONVERT OR NOT TO CONVERT

Can you convert your Traditional IRA to a Roth IRA? The answer is yes if you
meet these requirements:
    You must pay taxes on the amount you convert. If you convert in 1998, you 
can spread your tax payments over the next four years. This four-year allowance
will not be available after December 31, 1998.
    You cannot convert to a Roth IRA if you are married and file your tax return
separately, or if your annual gross income is over $100,000.

SOME ROTH IRA CONVERSION GUIDELINES

If you can check most of these boxes, converting your Traditional IRA to a Roth
IRA may make sense for you.

[ ] You have assets outside your retirement savings with which you can easily
    afford to pay the taxes due when you convert.

[ ] You have 10 years or more before you retire. The longer you invest tax-free,
    the more you benefit.

[ ] Your tax rate will probably be higher in retirement than it is now. If so,
    you'll pay less taxes now to convert than you would pay at retirement if you
    withdrew from a traditional IRA.

[ ] You plan to convert in 1998. On January 1, 1999, the ability to spread tax
    payments over four years disappears.

[ ] You want to keep making contributions after age 70-1/2 and may wish to pass
    your IRA assets on to your heirs after your death.

                                The Roth IRA Analyzer & Calculator 
                                at AIM's Internet Web site--www.aimfunds.com-- 
[Graphic]                       can help you determine your IRA eligibility 
                                status and whether it makes sense for you to 
                                convert an existing IRA into a Roth IRA.

MAKE YOUR IRA CONVERSION DECISION A TRULY INFORMED ONE

Talk to your financial consultant, who knows your specific needs and goals. You
may also wish to talk with a tax adviser.

This discussion does not constitute tax advice. Your tax adviser can provide
guidance concerning your particular situation.


                                       5
<PAGE>   8
SCHEDULE OF INVESTMENTS
 
December 31, 1997
 
<TABLE>
<CAPTION>
                                                     MARKET
                                      SHARES         VALUE
<S>                                 <C>           <C>
COMMON STOCKS-76.72%

AEROSPACE/DEFENSE-1.95%

Boeing Co. (The)                        110,000   $  5,383,125
- --------------------------------------------------------------
Lockheed Martin Corp.                    70,000      6,895,000
- --------------------------------------------------------------
                                                    12,278,125
- --------------------------------------------------------------

AGRICULTURAL PRODUCTS-1.09%

Archer-Daniels-Midland Co.              315,000      6,831,563
- --------------------------------------------------------------

AUTO PARTS & EQUIPMENT-1.84%

Genuine Parts Co.                       200,000      6,787,500
- --------------------------------------------------------------
Snap-on Inc.                            110,000      4,798,750
- --------------------------------------------------------------
                                                    11,586,250
- --------------------------------------------------------------

AUTOMOBILES-1.36%

Ford Motor Co.                          175,000      8,520,313
- --------------------------------------------------------------

BANKS (MAJOR REGIONAL)-2.75%

First Union Corp.                        60,000      3,075,000
- --------------------------------------------------------------
NationsBank Corp.                       100,000      6,081,250
- --------------------------------------------------------------
Wachovia Corp.                          100,000      8,112,500
- --------------------------------------------------------------
                                                    17,268,750
- --------------------------------------------------------------

BANKS (MONEY CENTER)-1.66%

First Chicago N.B.D. Corp.              125,000     10,437,500
- --------------------------------------------------------------

BANKS (REGIONAL)-1.66%

First of America Bank Corp.             135,000     10,411,875
- --------------------------------------------------------------

BEVERAGES (ALCOHOLIC)-1.05%

Anheuser-Busch Companies, Inc.          150,000      6,600,000
- --------------------------------------------------------------

CHEMICALS-1.21%

Dow Chemical Co. (The)                   75,000      7,612,500
- --------------------------------------------------------------

COMPUTERS (HARDWARE)-4.01%

Compaq Computer Corp.                   150,000      8,465,625
- --------------------------------------------------------------
Hewlett-Packard Co.                     100,000      6,250,000
- --------------------------------------------------------------
International Business Machines
  Corp.                                 100,000     10,456,250
- --------------------------------------------------------------
                                                    25,171,875
- --------------------------------------------------------------

COMPUTERS (SOFTWARE & SERVICES)-2.66%

Computer Associates International,
  Inc.                                  150,000      7,931,250
- --------------------------------------------------------------
Electronic Data Systems Corp.           200,000      8,787,500
- --------------------------------------------------------------
                                                    16,718,750
- --------------------------------------------------------------

DISTRIBUTORS (FOOD & HEALTH)-1.21%

Fleming Companies Inc.                  100,000      1,343,750
- --------------------------------------------------------------
SUPERVALU, Inc.                         150,000      6,281,250
- --------------------------------------------------------------
                                                     7,625,000
- --------------------------------------------------------------

ELECTRIC COMPANIES-3.69%

Edison International                    250,000   $  6,796,875
- --------------------------------------------------------------
Entergy Corp.                           300,000      8,981,250
- --------------------------------------------------------------
GPU, Inc.                               175,000      7,371,875
- --------------------------------------------------------------
                                                    23,150,000
- --------------------------------------------------------------

ELECTRICAL EQUIPMENT-2.08%

General Electric Co.                    100,000      7,337,500
- --------------------------------------------------------------
Rockwell International Corp.            110,000      5,747,500
- --------------------------------------------------------------
                                                    13,085,000
- --------------------------------------------------------------

FINANCIAL (DIVERSIFIED)-2.65%

American General Corp.                  110,000      5,946,875
- --------------------------------------------------------------
Morgan Stanley, Dean Witter,
  Discover & Co.                        181,500     10,731,188
- --------------------------------------------------------------
                                                    16,678,063
- --------------------------------------------------------------

FOODS-2.40%

H.J. Heinz Co.                          125,000      6,351,562
- --------------------------------------------------------------
Unilever N.V.-New York Shares
  (Netherlands)                         140,000      8,741,250
- --------------------------------------------------------------
                                                    15,092,812
- --------------------------------------------------------------

FOOTWEAR-0.46%

Reebok International Ltd.(a)            100,000      2,881,250
- --------------------------------------------------------------

HEALTH CARE (DIVERSIFIED)-2.26%

Abbott Laboratories                     100,000      6,556,250
- --------------------------------------------------------------
American Home Products Corp.            100,000      7,650,000
- --------------------------------------------------------------
                                                    14,206,250
- --------------------------------------------------------------

HEALTH CARE (DRUGS-GENERIC & OTHER)-1.17%

Mylan Laboratories, Inc.                350,000      7,328,125
- --------------------------------------------------------------

HEALTH CARE (DRUGS-MAJOR
  PHARMACEUTICALS)-3.79%

Lilly (Eli) & Co.                       100,000      6,962,500
- --------------------------------------------------------------
Merck & Co., Inc.                       100,000     10,625,000
- --------------------------------------------------------------
Schering-Plough Corp.                   100,000      6,212,500
- --------------------------------------------------------------
                                                    23,800,000
- --------------------------------------------------------------

HEALTH CARE (HOSPITAL MANAGEMENT)-0.94%

Columbia/HCA Healthcare Corp.           200,000      5,925,000
- --------------------------------------------------------------

HOUSEHOLD FURNITURE & APPLIANCES-0.66%

Whirlpool Corp.                          75,000      4,125,000
- --------------------------------------------------------------

HOUSEWARES-0.65%

Fortune Brands, Inc.                    110,000      4,076,875
- --------------------------------------------------------------

INSURANCE (MULTI-LINE)-1.01%

Loews Corp.                              60,000      6,367,500
- --------------------------------------------------------------
</TABLE>
 
                                      6
<PAGE>   9
<TABLE>
<CAPTION>
                                                     MARKET
                                      SHARES         VALUE
<S>                                 <C>           <C>
INSURANCE (PROPERTY-CASUALTY)-2.23%

Ohio Casualty Corp.                     150,000   $  6,693,750
- --------------------------------------------------------------
SAFECO Corp.                            150,000      7,312,500
- --------------------------------------------------------------
                                                    14,006,250
- --------------------------------------------------------------

INSURANCE BROKERS-1.19%

Marsh & McLennan Co.                    100,000      7,456,250
- --------------------------------------------------------------

IRON & STEEL-1.15%

Nucor Corp.                             150,000      7,246,875
- --------------------------------------------------------------

MANUFACTURING (DIVERSIFIED)-4.14%

Hanson PLC-ADR (United Kingdom)         225,000      5,189,062
- --------------------------------------------------------------
Minnesota Mining and Manufacturing
  Co.                                    70,000      5,744,375
- --------------------------------------------------------------
National Service Industries, Inc.        75,000      3,717,187
- --------------------------------------------------------------
Norsk Hydro A.S.A.-ADR (Norway)         100,000      5,100,000
- --------------------------------------------------------------
Textron, Inc.                           100,000      6,250,000
- --------------------------------------------------------------
                                                    26,000,624
- --------------------------------------------------------------

METALS MINING-0.79%

Phelps Dodge Corp.                       80,000      4,980,000
- --------------------------------------------------------------

OIL (INTERNATIONAL INTEGRATED)-4.39%

Amoco Corp.                              50,000      4,256,250
- --------------------------------------------------------------
Exxon Corp.                             100,000      6,118,750
- --------------------------------------------------------------
Repsol S.A.-ADR (Spain)                 200,000      8,512,499
- --------------------------------------------------------------
Royal Dutch Petroleum Co.-ADR-New
  York Shares (Netherlands)             160,000      8,670,000
- --------------------------------------------------------------
                                                    27,557,499
- --------------------------------------------------------------

PAPER & FOREST PRODUCTS-0.68%

Westvaco Corp.                          135,000      4,244,063
- --------------------------------------------------------------

PUBLISHING (NEWSPAPERS)-0.98%

Gannett Co., Inc.                       100,000      6,181,250
- --------------------------------------------------------------

RAILROADS-0.81%

Illinois Central Corp.                  150,000      5,109,375
- --------------------------------------------------------------

RESTAURANTS-0.95%

McDonald's Corp.                        125,000      5,968,750
- --------------------------------------------------------------

RETAIL (BUILDING SUPPLIES)-0.82%

Sherwin-Williams Co.                    185,000      5,133,750
- --------------------------------------------------------------

RETAIL (DEPARTMENT STORES)-1.52%

Dillards Inc.                           100,000      3,525,000
- --------------------------------------------------------------
J.C. Penney Co., Inc.                   100,000      6,031,250
- --------------------------------------------------------------
                                                     9,556,250
- --------------------------------------------------------------

RETAIL (DRUG STORES)-0.70%

Rite Aid Corp.                           75,000      4,401,563
- --------------------------------------------------------------

RETAIL (GENERAL MERCHANDISE)-0.46%

Kmart Corp.                             250,000      2,890,625
- --------------------------------------------------------------

SERVICES (COMMERCIAL & CONSUMER)-0.98%

Dun & Bradstreet Corp.                  200,000   $  6,187,500
- --------------------------------------------------------------

SPECIALTY PRINTING-0.96%

Deluxe Corp.                            175,000      6,037,500
- --------------------------------------------------------------

TELEPHONE-4.35%

Bell Atlantic Corp.                      70,000      6,370,000
- --------------------------------------------------------------
British Telecommunications PLC-ADR
  (United Kingdom)                       88,000      7,067,500
- --------------------------------------------------------------
Telefonica de Espana-ADR (Spain)         60,000      5,463,750
- --------------------------------------------------------------
Telefonos de Mexico S.A.-ADR
  (Mexico)                              150,000      8,409,375
- --------------------------------------------------------------
                                                    27,310,625
- --------------------------------------------------------------

TEXTILES (APPAREL)-1.98%

Liz Claiborne, Inc.                     100,000      4,181,250
- --------------------------------------------------------------
VF Corp.                                180,000      8,268,750
- --------------------------------------------------------------
                                                    12,450,000
- --------------------------------------------------------------

TOBACCO-1.67%

Gallaher Group PLC-ADR (United
  Kingdom)                              110,000      2,351,250
- --------------------------------------------------------------
Philip Morris Companies, Inc.           180,000      8,156,250
- --------------------------------------------------------------
                                                    10,507,500
- --------------------------------------------------------------

WASTE MANAGEMENT-1.76%

Browning-Ferris Industries, Inc.        150,000      5,550,000
- --------------------------------------------------------------
Waste Management, Inc.                  200,000      5,500,000
- --------------------------------------------------------------
                                                    11,050,000
- --------------------------------------------------------------
    Total Common Stocks                            482,054,625
- --------------------------------------------------------------

CORPORATE BONDS & NOTES-2.82%

AUTOMOBILES-0.12%

Ford Motor Co., Notes, 7.50%,
  11/15/99                          $   750,000   $    770,100
- --------------------------------------------------------------

BANKS (MAJOR REGIONAL)-0.41%

National City Corp., Sub Notes,
  7.20%, 05/15/05                     1,000,000      1,040,840
- --------------------------------------------------------------
NationsBank Corp., Sr. Notes,
  5.375%, 04/15/00                    1,550,000      1,527,758
- --------------------------------------------------------------
                                                     2,568,598
- --------------------------------------------------------------

COMMUNICATIONS EQUIPMENT-0.48%

Motorola Inc., Notes, 6.50%,
  03/01/08                            3,000,000      3,034,620
- --------------------------------------------------------------

CONSUMER FINANCE-0.47%

Commercial Credit Co., Notes,
  5.55%, 02/15/01                     3,000,000      2,946,540
- --------------------------------------------------------------

ELECTRIC COMPANIES-0.49%

Penn Power & Lighting, First
  Mortgage Notes, 6.875%, 02/01/03    1,000,000      1,026,870
- --------------------------------------------------------------
  6.55%, 03/01/06                     1,900,000      1,921,717
- --------------------------------------------------------------
</TABLE>
 
                                      7
<PAGE>   10
<TABLE>
<CAPTION>
                                     PRINCIPAL       MARKET
                                      AMOUNT         VALUE
<S>                                 <C>           <C>
ELECTRIC COMPANIES-(CONTINUED)

Union Electric, First Mortgage
  Notes, 6.75%, 10/15/99            $   150,000   $    151,940
- --------------------------------------------------------------
                                                     3,100,527
- --------------------------------------------------------------

ELECTRICAL EQUIPMENT-0.24%

Boeing Co., Notes, 6.625%,
  06/01/05                            1,500,000      1,530,960
- --------------------------------------------------------------

RETAIL (BUILDING SUPPLIES)-0.49%

Sherwin-Williams Co., Notes,
  6.50%, 02/01/02                     3,000,000      3,044,880
- --------------------------------------------------------------

RETAIL (GENERAL MERCHANDISE)-0.12%

Wal-Mart Stores, Notes, 5.50%,
  03/01/98                              750,000        750,188
- --------------------------------------------------------------
    Total Corporate Bonds & Notes                   17,746,413
- --------------------------------------------------------------

U.S. GOVERNMENT AGENCY SECURITIES-4.01%

Government National Mortgage
  Association ("GNMA")-1.08%

Pass through certificates
  6.50%, 10/15/08                     1,215,910      1,228,446
- --------------------------------------------------------------
  7.00%, 10/15/08                     1,137,865      1,164,525
- --------------------------------------------------------------
  6.00%, 11/15/08                     1,300,666      1,297,414
- --------------------------------------------------------------
  7.50%, 03/15/26                     3,029,768      3,114,965
- --------------------------------------------------------------
                                                     6,805,350
- --------------------------------------------------------------
Federal Home Loan Mortgage Corp.
  ("FHLMC")-0.93%

Pass through certificates
  6.50%, 07/01/01                     3,389,645      3,409,745
- --------------------------------------------------------------
  8.00%, 10/01/10                     2,366,659      2,445,777
- --------------------------------------------------------------
                                                     5,855,522
- --------------------------------------------------------------
Federal National Mortgage
  Association ("FNMA")-2.00%

Pass through certificates
  8.50%, 03/01/10                     2,356,062      2,448,090
- --------------------------------------------------------------
  6.50%, 06/01/11 to 05/01/26         7,251,640      7,209,879
- --------------------------------------------------------------
  7.50%, 10/01/96 to 11/01/26         2,807,244      2,874,786
- --------------------------------------------------------------
                                                    12,532,755
- --------------------------------------------------------------
    Total U.S. Government Agency
      Securities                                    25,193,627
- --------------------------------------------------------------

U.S. TREASURY SECURITIES-15.63%

U.S. Treasury Bonds-4.09%

  7.25%, 08/15/22                   $ 9,000,000   $ 10,399,680
- --------------------------------------------------------------
  9.375%, 02/15/06                    8,000,000      9,845,920
- --------------------------------------------------------------
  9.25%, 02/15/16                     4,000,000      5,428,360
- --------------------------------------------------------------
                                                    25,673,960
- --------------------------------------------------------------
U.S. Treasury Notes-11.54%

  6.125%, 03/31/98                   10,000,000     10,019,300
- --------------------------------------------------------------
  7.125%, 10/15/98                    5,000,000      5,057,700
- --------------------------------------------------------------
  8.875%, 02/15/99                    6,250,000      6,467,687
- --------------------------------------------------------------
  6.75%, 06/30/99                     5,000,000      5,080,400
- --------------------------------------------------------------
  6.375%, 07/15/99                    5,000,000      5,053,850
- --------------------------------------------------------------
  8.75%, 08/15/00                     9,000,000      9,663,120
- --------------------------------------------------------------
  7.875%, 08/15/01                    7,000,000      7,487,620
- --------------------------------------------------------------
  7.50%, 05/15/02                     4,500,000      4,806,405
- --------------------------------------------------------------
  6.25%, 02/15/03                     5,000,000      5,115,750
- --------------------------------------------------------------
  7.25%, 05/15/04                     6,000,000      6,478,440
- --------------------------------------------------------------
  6.50%, 08/15/05                     7,000,000      7,306,670
- --------------------------------------------------------------
                                                    72,536,942
- --------------------------------------------------------------
    Total U.S. Treasury Securities                  98,210,902
- --------------------------------------------------------------

REPURCHASE AGREEMENT-0.56%(b)

Smith Barney Inc., 6.75%,
  01/02/98(c)                         3,519,858      3,519,858
- --------------------------------------------------------------
TOTAL INVESTMENTS-99.74%                           626,725,425
- --------------------------------------------------------------
OTHER ASSETS LESS LIABILITIES-0.26%                  1,605,092
- --------------------------------------------------------------
NET ASSETS-100.00%                                $628,330,517
==============================================================
</TABLE>
 
Notes to Schedule of Investments:
 
(a) Non-income producing security.
(b) Collateral on repurchase agreements, including the Fund's pro-rata interest
    in joint repurchase agreements, is taken into possession by the Fund upon
    entering into the repurchase agreement. The collateral is marked to market
    daily to insure its market value as being 102% of the sales price of the
    repurchase agreement. The investments in some repurchase agreements are
    through participation in joint accounts with other mutual funds, private
    accounts and certain non-registered investment companies managed by the
    investment advisor or its affiliates.
(c) Joint repurchase agreement entered into 12/31/97 with a maturing value of
    $400,150,000. Collateralized by $395,097,000 U.S. Government obligations, 0%
    to 13.875% due 01/07/98 to 12/15/43 with an aggregate market value at
    12/31/97 of $408,000,323.
 
Abbreviations:
 
Sr.  - Senior
Sub. - Subordinated
 
See Notes to Financial Statements.

                                        8
<PAGE>   11
STATEMENT OF ASSETS AND LIABILITIES
 
DECEMBER 31, 1997
 
<TABLE>
<S>                                          <C>
ASSETS:

Investments, at market value (cost
  $432,776,171)                              $626,725,425
- ---------------------------------------------------------
Receivables for:
  Capital stock sold                            1,053,096
- ---------------------------------------------------------
  Interest and dividends                        3,500,542
- ---------------------------------------------------------
Investment for deferred compensation plan           2,561
- ---------------------------------------------------------
Other assets                                       14,718
- ---------------------------------------------------------
    Total assets                              631,296,342
- ---------------------------------------------------------

LIABILITIES:

Payables for:
  Capital stock reacquired                        779,071
- ---------------------------------------------------------
  Deferred compensation plan                        2,561
- ---------------------------------------------------------
Accrued advisory fees                             397,296
- ---------------------------------------------------------
Accrued operating services fees                   233,315
- ---------------------------------------------------------
Accrued distribution fees                       1,511,312
- ---------------------------------------------------------
Accrued directors' fees and expenses               42,270
- ---------------------------------------------------------
    Total liabilities                           2,965,825
- ---------------------------------------------------------
Net assets applicable to shares outstanding  $628,330,517
=========================================================

NET ASSETS:

Class A                                      $ 25,151,388
=========================================================
Class C                                      $603,179,129
=========================================================

CAPITAL STOCK, $.001, PAR VALUE PER SHARE:

Class A:
  Authorized                                  100,000,000
- ---------------------------------------------------------
  Outstanding                                   1,274,141
=========================================================
Class C:
  Authorized                                  100,000,000
- ---------------------------------------------------------
  Outstanding                                  30,552,730
=========================================================
Class A:
  Net asset value and redemption price per
    share                                    $      19.74
=========================================================
  Offering price per share:
    (Net asset value of $19.74 divided by 
    94.50%)                                  $      20.89
=========================================================
Class C:
  Net asset value and offering price per
    share                                    $      19.74
=========================================================
</TABLE>
 
See Notes to Financial Statements.
 
STATEMENT OF OPERATIONS
 
FOR THE YEAR ENDED DECEMBER 31, 1997
 
<TABLE>
<S>                                          <C>
INVESTMENT INCOME:

Interest                                     $ 11,975,969
- ---------------------------------------------------------
Dividends                                       9,478,210
- ---------------------------------------------------------
    Total investment income                    21,454,179
- ---------------------------------------------------------

EXPENSES:

Advisory fees                                   4,244,780
- ---------------------------------------------------------
Operating services fees                         2,513,883
- ---------------------------------------------------------
Distribution fees-Class A                          34,863
- ---------------------------------------------------------
Distribution fees-Class C                       5,560,293
- ---------------------------------------------------------
Directors' fees and expenses                       61,419
- ---------------------------------------------------------
    Total expenses                             12,415,238
- ---------------------------------------------------------
Less: Fees waived by distributors                 (10,010)
- ---------------------------------------------------------
    Net expenses                               12,405,228
- ---------------------------------------------------------
Net investment income                           9,048,951
- ---------------------------------------------------------

REALIZED AND UNREALIZED GAIN ON INVESTMENT
  SECURITIES:

Net realized gain from investment
  securities                                   23,883,293
- ---------------------------------------------------------
Net unrealized appreciation of investment
  securities                                   86,058,520
- ---------------------------------------------------------
    Net gain from investment securities       109,941,813
- ---------------------------------------------------------
Net increase in net assets resulting from
  operations                                 $118,990,764
=========================================================
</TABLE>
 
                                      9
<PAGE>   12
 
STATEMENT OF CHANGES IN NET ASSETS
 
FOR THE YEARS ENDED DECEMBER 31, 1997 AND 1996
 
<TABLE>
<CAPTION>
                                                                  1997           1996
                                                              ------------   ------------
<S>                                                           <C>            <C>
OPERATIONS:

  Net investment income                                       $  9,048,951   $  8,108,449
- -----------------------------------------------------------------------------------------
  Net realized gain from investment securities                  23,883,293     23,531,236
- -----------------------------------------------------------------------------------------
  Unrealized appreciation of investment securities              86,058,520     26,214,708
- -----------------------------------------------------------------------------------------
    Net increase in net assets resulting from operations       118,990,764     57,854,393
- -----------------------------------------------------------------------------------------
Distributions to shareholders from net investment income:
  Class A                                                         (246,939)            --
- -----------------------------------------------------------------------------------------
  Class C                                                       (8,674,714)    (8,041,627)
- -----------------------------------------------------------------------------------------
Distributions to shareholders from net realized gains on
  investment securities:
  Class A                                                         (610,538)            --
- -----------------------------------------------------------------------------------------
  Class C                                                      (14,999,384)   (23,712,747)
- -----------------------------------------------------------------------------------------
Share transactions-net:
  Class A                                                       24,377,889             --
- -----------------------------------------------------------------------------------------
  Class C                                                       19,575,501     64,656,241
- -----------------------------------------------------------------------------------------
    Net increase in net assets                                 138,412,579     90,756,260
- -----------------------------------------------------------------------------------------

NET ASSETS:

  Beginning of period                                          489,917,938    399,161,678
- -----------------------------------------------------------------------------------------
  End of period                                               $628,330,517   $489,917,938
=========================================================================================

NET ASSETS CONSIST OF:

  Capital (par value and additional paid-in)                  $426,093,882   $382,140,492
- -----------------------------------------------------------------------------------------
  Undistributed net investment income                              166,050         69,809
- -----------------------------------------------------------------------------------------
  Undistributed net realized gain (loss) from investment
    securities                                                   8,121,332       (183,096)
- -----------------------------------------------------------------------------------------
  Unrealized appreciation of investment securities             193,949,253    107,890,733
- -----------------------------------------------------------------------------------------
                                                              $628,330,517   $489,917,938
=========================================================================================
</TABLE>
 
See Notes to Financial Statements.
 
                                       10
<PAGE>   13
 
NOTES TO FINANCIAL STATEMENTS
 
DECEMBER 31, 1997
 
NOTE 1-SIGNIFICANT ACCOUNTING POLICIES
 
AIM Advisor Flex Fund (the "Fund", formerly INVESCO Advisor Flex Portfolio) is a
series portfolio of AIM Advisor Funds, Inc. (the "Company" formerly, INVESCO
Advisor Funds, Inc.). The Company is a Maryland corporation and is registered
under the Investment Company Act of 1940, as amended (the "1940 Act"), as an
open-end series management investment company consisting of seven diversified
portfolios. The Fund currently offers two different classes of shares: Class A
shares and Class C shares. Class A shares are sold with a front-end sales
charge. Class C shares are sold with a contingent deferred sales charge. Matters
affecting each portfolio or class will be voted on exclusively by the
shareholders of such portfolio or class. The assets, liabilities and operations
of each portfolio are accounted for separately. The Fund's investment objective
is to achieve a high total return on investment through capital appreciation and
current income, without regard to federal income tax considerations. Information
presented in these financial statements pertains only to the Fund.
  The preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amount of assets and liabilities at the date of the
financial statements and the reported amounts of income and expenses during the
reporting period. Actual results could differ from those estimates. The
following is a summary of significant accounting policies followed by the Fund
in the preparation of its financial statements.
A.  Security Valuations-A security listed or traded on an exchange (except
    convertible bonds) is valued at its last sales price on the exchange where
    the security is principally traded, or lacking any sales on a particular
    day, the security is valued at the mean between the closing bid and asked
    prices on that day. Each security traded in the over-the-counter market (but
    not including securities reported on the NASDAQ National Market System) is
    valued at the mean between the last bid and asked prices based upon quotes
    furnished by market makers for such securities. Each security reported on
    the NASDAQ National Market System is valued at the last sales price on the
    valuation date, or absent a last sales price, at the mean of the closing bid
    and asked prices. Debt obligations (including convertible bonds) are valued
    on the basis of prices provided by an independent pricing service. Prices
    provided by the pricing service may be determined without exclusive reliance
    on quoted prices, and may reflect appropriate factors such as yield, type of
    issue, coupon rate and maturity date. Securities for which market prices are
    not provided by any of the above methods are valued at the mean between last
    bid and asked prices based upon quotes furnished by independent sources.
    Securities for which market quotations are not readily available or are
    questionable are valued at fair value as determined in good faith by or
    under the supervision of the Company's Board of Directors. Investments with
    maturities of 60 days or less are valued on the basis of amortized cost
    which approximates market value.
B.  Securities Transactions, Investment Income and Distributions-Securities
    transactions are accounted for on a trade date basis. Realized gains or
    losses on sales are computed on the basis of specific identification of the
    securities sold. Interest income is recorded as earned from settlement date
    and is recorded on the accrual basis. Dividend income and distributions to
    shareholders are recorded on the ex-dividend date. On December 31, 1997,
    undistributed net investment income was reduced by $31,057 and undistributed
    net realized gains increased by $31,057 in order to comply with the
    requirements of the American Institute of Certified Public Accountants
    Statement of Position 93-2. Net assets of the Fund were unaffected by the
    reclassifications discussed above.
C.  Bond Premiums-It is the policy of the Fund not to amortize market premiums
    on bonds for financial reporting purposes.
D.  Federal Income Taxes-The Fund intends to comply with the requirements of the
    Internal Revenue Code necessary to qualify as a regulated investment company
    and, as such, will not be subject to federal income taxes on otherwise
    taxable income (including net realized capital gains) which is distributed
    to shareholders. Therefore, no provision for federal income taxes is
    recorded in the financial statements.
E.  Expenses-Distribution expenses directly attributable to a class of shares
    are charged to that class' operations. All other expenses which are
    attributable to more than one class are allocated among the classes.
 
NOTE 2-ADVISORY FEES AND OTHER TRANSACTIONS WITH AFFILIATES
 
The Company has entered into a master investment advisory agreement with A I M
Advisors, Inc. ("AIM"). Under the terms of the master investment advisory
agreement, the Fund pays an advisory fee to AIM at the annual rate of 0.75% of
the Fund's average daily net assets. AIM has entered into a sub-advisory
agreement with INVESCO Capital Management, Inc. ("ICM") whereby AIM pays ICM an
annual rate of 0.20% of the Fund's average daily net assets. Prior to August 4,
1997, the Company had an investment advisory agreement with INVESCO Services,
Inc. ("ISI") to serve as the Fund's investment advisor. Under the terms of the
prior investment agreement, the Fund paid ISI an advisory fee equal to an annual
rate of 0.75% of the average daily net assets of the Fund. Under the terms of
the prior sub-advisory agreement between ISI and ICM, ISI paid ICM a
sub-advisory fee equal to an annual rate of 0.20% of the Fund's average daily
net assets.
  The Company, pursuant to an operating services agreement with AIM, has agreed
to pay AIM an annual rate of 0.45% of average daily net assets of the Fund for
providing or arranging to provide accounting, legal (except litigation),
dividend disbursing, transfer agency, registrar, custodial, shareholder
reporting, sub-accounting and recordkeeping services and functions. This
agreement provides that AIM pays all fees and expenses associated with these and
other functions, including, but not limited to, registration fees, shareholder
meeting fees, and proxy statement and shareholder report expenses. During the
period August 4, 1997 to December 31, 1997, AIM was paid $1,106,526 for such
services. Prior to August 4, 1997, the Company had an operating services
 
                                       11
<PAGE>   14
 
agreement with ISI whereby the Fund paid ISI an annual rate of 0.45% of average
daily net assets of the Fund. During the period January 1, 1997 through August
3, 1997, the Fund paid ISI $1,407,357.
  The Company has entered into a master distribution agreement with A I M
Distributors, Inc. ("AIM Distributors") to serve as the distributor for the
Class A shares and Class C shares of the Fund. The Company has adopted a
distribution plan pursuant to Rule 12b-1 under the 1940 Act with respect to the
Fund's Class A shares and the Fund's Class C shares (the "Plan"). The Fund,
pursuant to the Plan, pays AIM Distributors compensation at a maximum annual
rate of 0.35% of the average daily net assets attributable to the Class A
shares. AIM has voluntarily agreed to limit the Plan payments to 0.25% for three
years beginning August 4, 1997. The Fund, pursuant to the Plan, pays AIM
Distributors a maximum annual rate of 1.00% of the Fund's average daily net
assets attributable to the Class C shares. Of these amounts, the Fund may pay a
service fee of 0.25% of the average daily net assets of the Class A and Class C
shares to selected dealers and financial institutions who furnish continuing
personal shareholder services to their customers who purchase and own shares of
the Fund. Any amounts not paid as a service fee under the Plan would constitute
an asset-based sales charge. The Plan also imposes a cap on the total sales
charges, including asset-based sales charges, that may be paid by the respective
classes. During the period August 4, 1997 to December 31, 1997, the Class A and
Class C shares paid AIM Distributors $19,781 and $2,430,068, respectively, as
compensation under the Plan. During the year ended December 31, 1997, AIM
Distributors and ISI waived fees of $10,010 for the Class A shares. Prior to
August 4, 1997, the Fund entered into a distribution plan with ISI in accordance
with Rule 12b-1 of the 1940 Act under substantially identical terms as described
for AIM Distributors above. During the period January 1, 1997 to August 3, 1997,
the Class A and Class C shares paid ISI $5,072 and $3,130,225, respectively, as
compensation under the Plan.
  AIM Distributors received commissions of $11,729 from sales of Class A shares
of the Fund during the period August 4, 1997 to December 31, 1997. ISI received
commissions of $6,860 from sales of Class A shares of the Fund during the period
January 1, 1997 through August 3, 1997. Such commissions are not an expense to
the Fund. They are deducted from, and are not included in, the proceeds from
sales of Class A shares. During the period August 4, 1997 to December 31, 1997,
AIM Distributors received commissions of $18,422 in contingent deferred sales
charges imposed on redemptions of shares. Certain officers and directors of the
Company are officers and directors of AIM, A I M Fund Services, Inc. and AIM
Distributors. During the period January 1, 1997 through August 3, 1997, ISI
received commissions of $18,877 in contingent deferred sales charges imposed on
redemptions of shares.
  The combined effect of the advisory master investment agreements, operating
services agreement and the distribution Plan for the Fund is to place a cap or
ceiling on the total expenses of the Fund, other than brokerage commissions,
interest, taxes, litigation, directors' fees and expenses, and other
extraordinary expenses. AIM has voluntarily agreed to adhere to maximum expense
ratios for the Fund. To the extent that the Fund exceeds the amounts, AIM or its
affiliates will waive its fees to reimburse the Fund to assure that the Fund's
expenses do not exceed the designated maximum amounts except for those items
specifically identified above. If, in any calendar quarter, the average daily
net assets of the Fund are less than $500 million, the Fund's expenses shall not
exceed 1.55% for Class A and 2.20% for Class C; on the next $500 million of net
assets, expenses shall not exceed 1.50% for Class A and 2.15% for Class C; on
the next $1 billion of net assets, expenses shall not exceed 1.45% for Class A
and 2.10% for Class C; and on all assets over $2 billion, expenses shall not
exceed 1.40% for Class A and 2.05% for Class C.
  During the period August 4, 1997 to December 31, 1997, the Fund paid legal
fees of $765 for services rendered by Kramer, Levin, Naftalis & Frankel as
counsel to the Company's directors. A member of that firm is a director of the
Company.
 
NOTE 3-DIRECTORS' FEES
 
Directors' fees represent remuneration paid or accrued to each director who is
not an "interested person" of AIM. The Company may invest directors' fees, if so
elected by a director, in mutual fund shares in accordance with a deferred
compensation plan.
 
NOTE 4-INVESTMENT SECURITIES
 
The aggregate amount of investment securities (other than short-term securities)
purchased and sold by the Fund during the year ended December 31, 1997 was
$126,040,604 and $88,262,748, respectively.
  The amount of unrealized appreciation (depreciation) of investment securities,
on a tax basis, as of December 31, 1997 is as follows:
 
<TABLE>
<S>                                                             <C>
Aggregate unrealized appreciation of investment securities      $199,182,995
- ----------------------------------------------------------------------------
Aggregate unrealized (depreciation) of
  investment securities                                           (5,233,741)
- ----------------------------------------------------------------------------
Net unrealized appreciation of investment
  securities                                                    $193,949,254
============================================================================
</TABLE>

Investments have the same cost for tax and financial statement purposes.
 
                                      12
<PAGE>   15
 
NOTE 5-CAPITAL STOCK*
 
Changes in the Fund's capital stock outstanding during the years ended December
31, 1997 and 1996 were as follows:
 
<TABLE>
<CAPTION>
                                                                        1997                         1996
                                                              -------------------------   --------------------------
                                                                SHARES        AMOUNT        SHARES         AMOUNT
                                                              ----------   ------------   -----------   ------------
<S>                                                           <C>          <C>            <C>           <C>
Sold:
  Class A**                                                    1,255,277   $ 24,015,843            --   $         --
- --------------------------------------------------------------------------------------------------------------------
  Class C                                                      4,707,789     86,294,017     6,596,988    107,726,947
- --------------------------------------------------------------------------------------------------------------------
Issued as reinvestment of dividends:
  Class A**                                                       42,162        821,435            --             --
- --------------------------------------------------------------------------------------------------------------------
  Class C                                                      1,120,103     21,660,078     1,659,332     27,317,233
- --------------------------------------------------------------------------------------------------------------------
Reacquired:
  Class A**                                                      (23,298)      (459,389)           --             --
- --------------------------------------------------------------------------------------------------------------------
  Class C                                                     (4,738,134)   (88,378,594)   (4,281,464)   (70,387,939)
- --------------------------------------------------------------------------------------------------------------------
                                                               2,363,899   $ 43,953,390     3,974,856   $ 64,656,241
====================================================================================================================
</TABLE>
 
 * Shares have been restated to reflect a 4 for 1 stock split, effected in the
   form of a 300% stock dividend, on November 7, 1997.
** Class A shares commenced operations on January 1, 1997.
 
NOTE 6-FINANCIAL HIGHLIGHTS
 
Shown below are the financial highlights for a share of Class A capital stock
outstanding during the year ended December 31, 1997 and for a share of Class C
capital stock outstanding during each of the years in the five-year period ended
December 31, 1997.(a)
 
CLASS A:
 
<TABLE>
<CAPTION>
                                                               1997(b)
                                                              ----------
<S>                                                           <C>
Net asset value, beginning of period                          $    16.63
- ------------------------------------------------------------  ----------
Income from investment operations:
  Net investment income                                             0.41(c)
- ------------------------------------------------------------  ----------
  Net gains on securities (both realized and unrealized)            3.63
- ------------------------------------------------------------  ----------
    Total from investment operations                                4.04
- ------------------------------------------------------------  ----------
Less distributions:
  Dividends from net investment income                             (0.43)
- ------------------------------------------------------------  ----------
  Distributions from capital gains                                 (0.50)
- ------------------------------------------------------------  ----------
    Total distributions                                            (0.93)
- ------------------------------------------------------------  ----------
Net asset value, end of period                                $    19.74
============================================================  ==========
Total return(d)                                                    24.60%
============================================================  ==========
Ratios/supplemental data:
Net assets, end of period (000s omitted)                      $   25,151
============================================================  ==========
Ratio of expenses to average net assets(e)                          1.45%(f)
============================================================  ==========
Ratio of net investment income to average net assets(g)             2.34%(f)
============================================================  ==========
Portfolio turnover rate                                               17%
============================================================  ==========
Average brokerage commission rate(h)                          $   0.0537
============================================================  ==========
</TABLE>
 
(a) Per share information and shares have been restated to reflect a 4 for 1
    stock split, effected in the form of a 300% stock dividend, on November 7,
    1997.
(b) The Fund changed investment advisors on August 4, 1997.
(c) Calculated using average shares outstanding.
(d) Does not deduct sales charges.
(e) After fee waivers. The ratio of expenses to average net assets prior to fee
    waivers was 1.55%.
(f) Ratios are based on average net assets of $10,010,061.
(g) After fee waivers. The ratio of net investment income to average net assets
    prior to fee waivers was 2.24%.
(h) The average commission rate paid is the total brokerage commissions paid on
    applicable purchases and sales of securities for the period divided by the
    total number of related shares purchased and sold.
 
                                       13
<PAGE>   16
NOTE 6-FINANCIAL HIGHLIGHTS-continued

CLASS C:(a)
 
<TABLE>
<CAPTION>
                                                              1997(b)      1996       1995       1994       1993
                                                              --------   --------   --------   --------   --------
<S>                                                           <C>        <C>        <C>        <C>        <C>
Net asset value, beginning of period                          $  16.63   $  15.66   $  12.63   $  13.54   $  12.76
- ------------------------------------------------------------  --------   --------   --------   --------   --------
Income from investment operations:
  Net investment income                                           0.30(c)     0.30      0.32       0.32       0.28
- ------------------------------------------------------------  --------   --------   --------   --------   --------
  Net gains (losses) on securities (both realized and
    unrealized)                                                   3.60       1.81       3.09      (0.23)      1.05
- ------------------------------------------------------------  --------   --------   --------   --------   --------
    Total from investment operations                              3.90       2.11       3.41       0.09       1.33
- ------------------------------------------------------------  --------   --------   --------   --------   --------
Less distributions:
  Dividends from net investment income                           (0.29)     (0.29)     (0.32)     (0.31)     (0.27)
- ------------------------------------------------------------  --------   --------   --------   --------   --------
  Distributions from capital gains                               (0.50)     (0.85)     (0.06)     (0.69)     (0.28)
- ------------------------------------------------------------  --------   --------   --------   --------   --------
    Total distributions                                          (0.79)     (1.14)     (0.38)     (1.00)     (0.55)
- ------------------------------------------------------------  --------   --------   --------   --------   --------
Net asset value, end of period                                $  19.74   $  16.63   $  15.66   $  12.63   $  13.54
============================================================  ========   ========   ========   ========   ========
Total return(d)                                                  23.64%     13.61%     27.30%      0.64%     10.48%
============================================================  ========   ========   ========   ========   ========
Ratios/supplemental data:
Net assets, end of period (000s omitted)                      $603,179   $489,918   $399,162   $243,848   $274,349
============================================================  ========   ========   ========   ========   ========
Ratio of expenses to average net assets                           2.20%(e)   2.26%      2.28%      2.25%      2.25%(f)
============================================================  ========   ========   ========   ========   ========
Ratio of net investment income to average net assets              1.59%(e)   1.81%      2.28%      2.32%      2.10%(f)
============================================================  ========   ========   ========   ========   ========
Portfolio turnover rate                                             17%        26%         5%        36%        27%
============================================================  ========   ========   ========   ========   ========
Average brokerage commission rate(g)                          $ 0.0537   $ 0.0549        N/A        N/A        N/A
============================================================  ========   ========   ========   ========   ========
</TABLE>
 
(a) Per share information and shares have been restated to reflect a 4 for 1
    stock split, effected in the form of a 300% stock dividend, on November 7,
    1997.
(b) The Fund changed investment advisors on August 4, 1997.
(c) Calculated using average shares outstanding.
(d) Does not deduct contingent deferred sales charges.
(e) Ratios are based on average net assets of $556,338,988.
(f) After fee waivers and/or expense reimbursements. Ratios of expenses and net
    investment income to average net assets prior to fee waivers and/or expense
    reimbursements are 2.26% and 2.09%, respectively, for 1993.
(g) The average commission rate paid is the total brokerage commissions paid on
    applicable purchases and sales of securities for the period divided by the
    total number of related shares purchased and sold, which is required to be
    disclosed for fiscal years beginning September 1, 1995 and thereafter.
 
                                       14
<PAGE>   17
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
                       To the Board of Directors and Shareholders
                       of the AIM Advisor Funds, Inc.
 
                       In our opinion, the accompanying statement of assets and
                       liabilities, including the schedule of investments, and
                       the related statements of operations and of changes in
                       net assets and the financial highlights present fairly,
                       in all material respects, the financial position of the
                       AIM Advisor Flex Fund, one of the portfolios of the AIM
                       Advisor Funds, Inc. (hereafter referred to as the "Fund")
                       at December 31, 1997, the results of its operations for
                       the year then ended, the changes in its net assets for
                       each of the two years in the period then ended and the
                       financial highlights for the periods indicated, in
                       conformity with generally accepted accounting principles.
                       These financial statements and financial highlights
                       (hereafter referred to as "financial statements") are the
                       responsibility of the Fund's management; our
                       responsibility is to express an opinion on these
                       financial statements based on our audits. We conducted
                       our audits of these financial statements in accordance
                       with generally accepted auditing standards which require
                       that we plan and perform the audit to obtain reasonable
                       assurance about whether the financial statements are free
                       of material misstatement. An audit includes examining, on
                       a test basis, evidence supporting the amounts and
                       disclosures in the financial statements, assessing the
                       accounting principles used and significant estimates made
                       by management, and evaluating the overall financial
                       statement presentation. We believe that our audits, which
                       included confirmation of securities at December 31, 1997
                       by correspondence with the custodian and the application
                       of alternative auditing procedures where securities
                       purchased had not been received, provide a reasonable
                       basis for the opinion expressed above.
 
                       PRICE WATERHOUSE LLP
 
                       Denver, Colorado
                       February 5, 1998
 
                                       15
<PAGE>   18
Directors & Officers

<TABLE>
<S>                                           <C>                                               <C>
BOARD OF DIRECTORS                            OFFICERS                                          OFFICE OF THE FUND                 
                                                                                                                                   
Charles T. Bauer                              Charles T. Bauer                                  11 Greenway Plaza                  
Chairman                                      Chairman                                          Suite 100                          
A I M Management Group Inc.                                                                     Houston, TX 77046                  
                                              Robert H. Graham                                                                     
Bruce L. Crockett                             President                                         INVESTMENT ADVISOR                 
Director                                                                                                                           
ACE Limited;                                  John J. Arthur                                    A I M Advisors, Inc.               
Formerly Director, President, and             Senior Vice President and Treasurer               11 Greenway Plaza                  
Chief Executive Officer                                                                         Suite 100                          
COMSAT Corporation                            Carol F. Relihan                                  Houston, TX 77046                  
                                              Senior Vice President and Secretary                                                  
Owen Daly II                                                                                    SUB-ADVISOR                        
Director                                      Gary T. Crum                                                                         
Cortland Trust Inc.                           Senior Vice President                             INVESCO Capital Management, Inc.   
                                                                                                1315 Peachtree Street, N.E.        
Jack Fields                                   Dana R. Sutton                                    Atlanta, GA 30309                  
Chief Executive Officer                       Vice President and Assistant Treasurer                                               
Texana Global, Inc.;                                                                            TRANSFER AGENT                     
Formerly Member of the                        Robert G. Alley                                                                      
U.S. House of Representatives                 Vice President                                    A I M Fund Services, Inc.          
                                                                                                P.O. Box 4739                      
Carl Frischling                               Stuart W. Coco                                    Houston, TX 77210-4739             
Partner                                       Vice President                                                                       
Kramer, Levin, Naftalis & Frankel                                                               CUSTODIAN                          
                                              Melville B. Cox                                                                      
Robert H. Graham                              Vice President                                    State Street Bank and Trust Company
President and Chief Executive Officer                                                           225 Franklin Street                
A I M Management Group Inc.                   Karen Dunn Kelley                                 Boston, MA 02110                   
                                              Vice President                                                                       
John F. Kroeger                                                                                 COUNSEL TO THE FUND                
Formerly Consultant                           Jonathan C. Schoolar                                                                 
Wendell & Stockel Associates, Inc.            Vice President                                    Ballard Spahr                      
                                                                                                Andrews & Ingersoll                
Lewis F. Pennock                              P. Michelle Grace                                 1735 Market Street                 
Attorney                                      Assistant Secretary                               Philadelphia, PA 19103             
                                                                                                                                   
Ian W. Robinson                               Nancy L. Martin                                   COUNSEL TO THE DIRECTORS           
Consultant; Formerly Executive                Assistant Secretary                                                                  
Vice President and                                                                              Kramer, Levin, Naftalis & Frankel  
Chief Financial Officer                       Ofelia M. Mayo                                    919 Third Avenue                   
Bell Atlantic Management                      Assistant Secretary                               New York, NY 10022                 
Services, Inc.                                                                                                                     
                                              Lisa A. Moss                                      DISTRIBUTOR                        
Louis S. Sklar                                Assistant Secretary                                                                  
Executive Vice President                                                                        A I M Distributors, Inc.           
Hines Interests                               Kathleen J. Pflueger                              11 Greenway Plaza                  
Limited Partnership                           Assistant Secretary                               Suite 100                          
                                                                                                Houston, TX 77046                  
                                              Samuel D. Sirko                                                                      
                                              Assistant Secretary                               AUDITORS                           
                                                                                                                                   
                                              Stephen I. Winer                                  Price Waterhouse LLP               
                                              Assistant Secretary                               950 Seventeenth Street             
                                                                                                Denver, CO 80202                   
                                              Mary J. Benson                        
                                              Assistant Treasurer                   
</TABLE>

REQUIRED FEDERAL INCOME TAX INFORMATION

AIM Advisor Flex Fund Class A and Class C shares paid ordinary dividends in the
amount of $0.48 and $0.33 per share, respectively, during the Fund's tax year
ended December 31, 1997. Of these amounts, 79.36% is eligible for the dividends
received deduction for corporations. The Fund also distributed long-term capital
gains of $0.46 per share during the Fund's tax year ended December 31, 1997. Of
this amount, 31.61% is 20% rate gain.

REQUIRED STATE INCOME TAX INFORMATION

Of the total income dividends paid, 38.55% was derived from U.S. Treasury
obligations.

<PAGE>   19
                             HOW AIM MAKES INVESTING
                                  EASY FOR YOU

o   LOW INITIAL INVESTMENT. You can get your investment program started for as
    little as $500. Subsequent investments can be made for only $50.

o   AUTOMATIC REINVESTMENT OF DIVIDENDS AND/OR CAPITAL GAINS. Distributions may
    be received in cash or reinvested in the Fund free of charge. Over time, the
    power of compounding can significantly increase the value of your assets.

o   AUTOMATIC INVESTMENT PLAN. You may build your investment by regularly
    purchasing additional shares. Pre-authorized checks for $50 or more can be
    drafted monthly from your personal checking account.

o   EASY ACCESS TO YOUR MONEY. Your shares may be redeemed at net asset value 
    any day the New York Stock Exchange is open. The price of shares may be 
    more or less than their original cost, depending on market conditions.

o   SYSTEMATIC WITHDRAWAL PLAN. You may elect to receive checks of at least $50 
    monthly or quarterly through a systematic withdrawal plan.

o   EXCHANGE PRIVILEGE. As your goals change, you may exchange all or part of
    your assets for those of other funds within the same share class of The AIM
    Family of Funds--Registered Trademark--. The exchange privilege may be 
    modified or discontinued for any of the AIM funds.

o   RETIREMENT PLANS. You may purchase shares of the fund for your Individual
    Retirement Account (IRA) or any other type of retirement plan, and earn
    tax-deferred dollars for your retirement.

o   TOLL-FREE ACCESS. Current shareholders can call our AIM Investor Line at
    800-246-5463 for 24-hour-a-day account information. Or, of course, you may
    contact your financial consultant for assistance.

o   WWW.AIMFUNDS.COM. As a current shareholder, you can check account balances
    24 hours a day over the Internet. State-of-the-art encryption lets you send
    us questions that include confidential information without the fear of
    eavesdropping, tampering, or forgery.

                         -------------------------------

                              Current shareholders

                                  can call our

                              AIM Investor Line at

                                  800-246-5463

                                for 24-hour-a-day

                              account information.

                         -------------------------------


<PAGE>   20
<TABLE>
<S>                                                                       <C>
                                                                          THE AIM FAMILY OF FUNDS--REGISTERED TRADEMARK--
                                                                          
                                                                          AGGRESSIVE GROWTH
                                                                          AIM Aggressive Growth Fund*
                                                                          AIM Asian Growth Fund
                                                                          AIM Capital Development Fund
                                                                          AIM Constellation Fund
                                                                          AIM European Development Fund
                                                                          AIM Global Aggressive Growth Fund
                          [BUILDING PHOTO]                                                                          
                                                                          GROWTH OF CAPITAL
                                                                          AIM Advisor International Value Fund
                                                                          AIM Blue Chip Fund
                                                                          AIM Global Growth Fund
                                                                          AIM Growth Fund
                                                                          AIM International Equity Fund
                                                                          AIM Value Fund
                                                                          AIM Weingarten Fund
                                                                          
                                                                          GROWTH AND INCOME OR INCOME WITH CAPITAL GROWTH
                                                                          AIM Advisor Flex Fund 
                                                                          AIM Advisor Large Cap Value Fund 
                                                                          AIM Advisor MultiFlex Fund 
                                                                          AIM Advisor Real Estate Fund 
                                                                          AIM Balanced Fund 
                                                                          AIM Charter Fund 
                                                                          AIM Global Utilities Fund
                                                                          
                                                                          HIGH CURRENT INCOME OR CURRENT INCOME
                                                                          AIM High Yield Fund
                                                                          AIM Global Income Fund
                                                                          AIM Income Fund
                                                                          
                                                                          CURRENT TAX-FREE INCOME
                                                                          AIM High Income Municipal Fund
                                                                          AIM Municipal Bond Fund
                                                                          AIM Tax-Exempt Bond Fund of Connecticut
                                                                          AIM Tax-Free Intermediate Fund
                                                                          
                                                                          CURRENT INCOME AND HIGH DEGREE OF SAFETY
                                                                          AIM Intermediate Government Fund
                                                                          AIM Limited Maturity Treasury Fund
                                                                          AIM Money Market Fund
                                                                          AIM Tax-Exempt Cash Fund

A I M Management Group Inc. has provided leadership in the mutual
fund industry since 1976 and managed approximately $83 billion in
assets for more than 3.7 million shareholders, including                  *AIM Aggressive Growth Fund was closed to new investors  
individual investors, corporate clients, and financial                    on June 5, 1997. For more complete information about any 
institutions as of December 31, 1997. The AIM Family of                   AIM Fund(s), including sales charges and expenses, ask   
Funds--Registered Trademark-- is distributed nationwide, and AIM          your financial consultant or securities dealer for a free
today ranks among the nation's top 15 mutual fund companies in            prospectus(es). Please read the prospectus(es) carefully 
assets under management, according to Lipper Analytical Services,         before you invest or send money.                         
Inc.                                                                                                                               
                                                                                        Invest with DISCIPLINE(SM)
</TABLE>



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