ONE GROUP
PRES14A, 1999-03-30
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<PAGE>   1
 
                                  SCHEDULE 14A
 
                                 (RULE 14a-101)
 
                    INFORMATION REQUIRED IN PROXY STATEMENT
 
                            SCHEDULE 14A INFORMATION
 
                PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE
                        SECURITIES EXCHANGE ACT OF 1934
 
Filed by the Registrant [X]
Filed by a Party other than the Registrant [ ]
 
Check the appropriate box:
 
[X] Preliminary Proxy Statement
[ ] Confidential, For Use of the Commission Only (as permitted by Rule
    14a-6(e)(2))
[ ] Definitive Proxy Statement
[ ] Definitive Additional Materials
[ ] Soliciting Material Pursuant to sec.240.14a-11(c) or sec.240.14a-12
 
                             ONE GROUP MUTUAL FUNDS
- --------------------------------------------------------------------------------
                (Name of Registrant as specified in its Charter)
 
- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)
 
Payment of Filing Fee (Check the appropriate box):
 
     [X] No fee required.
 
     [ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and
0-11.
 
(1) Title of each class of securities to which transaction applies: N/A
 
- --------------------------------------------------------------------------------
 
(2) Aggregate number of securities to which transaction applies: N/A
 
- --------------------------------------------------------------------------------
 
(3) Per unit price or other underlying value of transaction computed pursuant to
    Exchange Act Rule 0-11 (set forth the amount on which the filing fee is
    calculated and state how it was determined): N/A
 
- --------------------------------------------------------------------------------
 
(4)  Proposed maximum aggregate value of transaction: N/A
 
- --------------------------------------------------------------------------------
 
(5)  Total fee paid: N/A
 
- --------------------------------------------------------------------------------
 
[ ] Fee paid previously with preliminary materials.
 
[ ] Check box if any part of the fee is offset as provided by Exchange Act Rule
    0-11(a)(2) and identifying the filing for which the offsetting fee was paid
    previously. Identify the previous filing by registration statement number,
    or the Form or Schedule and the date of its filing.
 
(1) Amount previously paid: N/A
 
- --------------------------------------------------------------------------------
 
(2) Form, schedule or registration statement no.: N/A
 
- --------------------------------------------------------------------------------
 
(3) Filing Party: N/A
 
- --------------------------------------------------------------------------------
 
(4) Date Filed: N/A
 
- --------------------------------------------------------------------------------
<PAGE>   2
 
                             ONE GROUP MUTUAL FUNDS
                               3435 STELZER ROAD
                              COLUMBUS, OHIO 43219
 
                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                            TO BE HELD MAY 17, 1999
 
     Notice is hereby given that a Special Meeting of the Shareholders of One
Group Mutual Funds will be held at the offices of The One Group Services Company
at 3435 Stelzer Road, Columbus, Ohio, 43219 on Monday, May 17, 1999 at 3:00 p.m.
(Eastern Time) for the following purposes:
 
     1. To elect the Board of Trustees of One Group Mutual Funds.
 
     2. To ratify the selection of independent accountants.
 
     3. To approve a change to a fundamental investment restriction by
eliminating language which prohibits One Group Mutual Funds from participating
on a joint or a joint and several basis in any trading account in securities.
 
     4. To eliminate a fundamental investment restriction which prohibits One
Group Prime Money Market Fund from investing in state, municipal, or private
activity bonds.
 
     5. To approve a change to a fundamental investment restriction which
prohibits One Group Prime Money Market Fund from concentrating its investments
in a single industry.
 
     6. To transact such other business as may properly come before the Special
Meeting or any adjournment thereof.
 
     Shareholders of record at the close of business on Thursday, March 11, 1999
are entitled to notice of, and to vote at, this Special Meeting or any
adjournment thereof.
 
                                                  By Order of the Trustees
 
                                                  Mark S. Redman
                                                  President and Assistant
                                                  Secretary
April __, 1999
 
     YOUR VOTE IS IMPORTANT. YOU CAN HELP THE TRUST AVOID THE NECESSITY AND
EXPENSE OF SENDING FOLLOW-UP LETTERS TO ENSURE A QUORUM BY PROMPTLY RETURNING
THE ENCLOSED PROXY. IF YOU ARE UNABLE TO ATTEND THE SPECIAL MEETING, PLEASE
MARK, SIGN, DATE, AND RETURN THE ENCLOSED PROXY SO THAT THE NECESSARY QUORUM MAY
BE REPRESENTED AT THE SPECIAL MEETING. THE ENCLOSED ENVELOPE REQUIRES NO POSTAGE
IF MAILED IN THE UNITED STATES.
 
                                        2
<PAGE>   3
 
                             ONE GROUP MUTUAL FUNDS
                               3435 STELZER ROAD
                              COLUMBUS, OHIO 43219
 
                        SPECIAL MEETING OF SHAREHOLDERS
                            TO BE HELD MAY 17, 1999
 
                                PROXY STATEMENT
 
     THE ENCLOSED PROXY IS SOLICITED ON BEHALF OF THE BOARD OF TRUSTEES (THE
"TRUSTEES") OF ONE GROUP MUTUAL FUNDS. The proxy is revocable at any time before
it is voted by sending written notice of the revocation or a subsequently
executed proxy to One Group Mutual Funds or by appearing personally and electing
to vote on Monday, May 17, 1999 at the Special Meeting of Shareholders of One
Group Mutual Funds at 3:00 p.m. (Eastern Time) at the offices of The One Group
Services Company, 3435 Stelzer Road, Columbus, Ohio 43219 (the meeting and any
adjournment of the meeting is referred to in this proxy statement as the
"Special Meeting"). The cost of preparing and mailing the Notice of Special
Meeting, the proxy card, this proxy statement and any additional proxy material
has been or is to be borne by One Group Mutual Funds. Proxy solicitations will
be made primarily by mail, but may also be made by telephone, telegraph, or
personal interview conducted by certain officers or employees of One Group
Mutual Funds or The One Group Services Company (the Trust's administrator
pursuant to an administration agreement between The One Group Services Company
and One Group Mutual Funds dated as of December 1, 1995). Shareholder
Communications Corporation has been retained to assist in the solicitation of
proxies primarily by contacting shareholders by telephone and telegram.
Authorizations to execute proxies may be obtained by telephonic or
electronically transmitted instructions in accordance with procedures designed
to authenticate the shareholder's identity. In all cases where a telephonic
proxy is solicited, the shareholder will be asked to provide his or her address,
social security number (in the case of an individual) or taxpayer identification
number (in the case of an entity) and the number of shares owned and to confirm
that the shareholder has received the proxy statement and proxy card in the
mail. Within 72 hours of receiving a shareholder's telephonic or electronically
transmitted voting instructions, a confirmation will be sent to the shareholder
to ensure that the vote has been taken in accordance with the shareholder's
instructions and to provide a telephone number to call immediately if the
shareholder's instructions are not correctly reflected in the confirmation.
Shareholders requiring further information with respect to telephonic or
electronically transmitted voting instructions or the proxy generally should
contact Shareholder Communications Corporation toll-free at 1-800-645-4497
between the hours of 9:00 a.m. and 11:00 p.m. One Group Mutual Funds estimates
that the services provided by Shareholder Communications Corporation will cost
approximately $25,000. In the event that a shareholder signs and returns the
proxy ballot, but does not indicate a choice as to any of the items on the proxy
ballot, the proxy attorneys will vote those shares in favor of such proposal(s).
 
     The Trust's executive offices are located at 3435 Stelzer Road, Columbus,
Ohio 43219. This proxy statement and the enclosed Notice of Special Meeting and
form of Proxy are first being mailed to shareholders on or about April __, 1999.
 
                                        3
<PAGE>   4
 
     Only shareholders of record at the close of business on March 11, 1999 will
be entitled to vote at the Special Meeting. The table below shows the number of
shares outstanding on that date:
 
<TABLE>
<CAPTION>
ONE GROUP FUND                                               SHARES OUTSTANDING
- --------------                                               ------------------
<S>                                                          <C>
One Group Prime Money Market Fund........................    4,370,309,864.014
One Group Municipal Money Market Fund....................      777,874,491.410
One Group Ohio Municipal Money Market Fund...............      104,645,997.550
One Group U.S. Treasury Securities Money Market Fund.....    5,833,396,946.083
One Group Government Money Market Fund...................    3,543,476,356.370
One Group Treasury Only Money Market Fund................      794,542,525.910
One Group Balanced Fund..................................       35,321,622.500
One Group Large Cap Growth Fund..........................      111,788,359.188
One Group Large Cap Value Fund...........................       58,224,279.209
One Group Mid Cap Growth Fund............................       55,896,032.415
One Group Mid Cap Value Fund.............................       58,683,912.960
One Group International Equity Index Fund................       36,123,624.568
One Group Equity Index Fund..............................       60,400,228.200
One Group Equity Income Fund.............................       40,885,811.985
One Group Diversified Equity Fund........................       63,223,786.518
One Group Small Cap Growth Fund..........................       14,545,650.403
One Group Intermediate Bond Fund.........................       90,705,994.855
One Group Income Bond Fund...............................      108,982,494.515
One Group Government Bond Fund...........................      106,487,929.810
One Group Ultra Short-Term Bond Fund.....................       25,575,140.681
One Group Short-Term Bond Fund...........................       58,521,312.917
One Group Treasury & Agency Fund.........................       23,220,190.834
One Group High Yield Bond Fund...........................        3,640,865.115
One Group Intermediate Tax-Free Bond Fund................       54,390,744.983
One Group Municipal Income Fund..........................       96,450,495.916
One Group Arizona Municipal Bond Fund....................       24,030,042.218
One Group West Virginia Municipal Bond Fund..............       11,229,206.313
One Group Louisiana Municipal Bond Fund..................       19,561,856.926
One Group Ohio Municipal Bond Fund.......................       21,014,232.266
One Group Kentucky Municipal Bond Fund...................       14,236,565.809
One Group Investor Growth Fund...........................       21,988,017.640
One Group Investor Growth & Income Fund..................       26,875,585.825
One Group Investor Conservative Growth Fund..............       14,143,959.566
One Group Investor Balanced Fund.........................       25,151,230.193
</TABLE>
 
     Each share of each Fund is entitled to one vote and each fractional share
is entitled to a proportionate fractional vote on each matter to be acted upon
at the Special Meeting.
 
     For purposes of determining the presence of a quorum and counting votes on
the matters presented, shares represented by abstentions and "broker non-votes"
will be counted as present, but not as votes cast, at the Special Meeting. Under
the Investment Company Act of 1940 (the "1940 Act"), the affirmative vote
necessary to approve each proposal may be determined with reference to a
percentage of votes present at the Special Meeting, which would have the effect
of treating abstentions and non-votes as if they were votes against the
proposal.
 
     One Group Mutual Fund's Declaration of Trust and Code of Regulations do not
provide for annual shareholder meetings, and no such meetings are planned for
2000. Proposals that shareholders would like to have included in a proxy
statement for any future meeting must be received by One Group Mutual Funds
within a reasonable period of time prior to printing and mailing proxy materials
for such meeting.
 
                                        4
<PAGE>   5
 
     COPIES OF ONE GROUP'S ANNUAL REPORT DATED JUNE 30, 1998 AND SEMI-ANNUAL
REPORT DATED DECEMBER 31, 1998 ARE AVAILABLE UPON REQUEST FROM THE ONE GROUP
SERVICES COMPANY, 3435 STELZER ROAD, COLUMBUS, OHIO, 43219 AND MAY BE OBTAINED
WITHOUT CHARGE BY CALLING 1-800-480-4111.
 
                              SUMMARY OF PROPOSALS
 
<TABLE>
<CAPTION>
DESCRIPTION OF PROPOSAL                                              FUNDS SOLICITED
- -----------------------                                             -----------------
<S>  <C>                                                            <C>
1.   To elect the Board of Trustees of One Group Mutual Funds.          All Funds
2.   To ratify the selection of independent accountants                 All Funds
3.   To approve a change to a fundamental investment restriction        All Funds
     by eliminating language which prohibits One Group Mutual
     Funds from participating on a joint or a joint and several
     basis in any trading account in securities.
4.   To eliminate a fundamental investment restriction which         One Group Prime
     prohibits One Group Prime Money Market Fund from investing     Money Market Fund
     in state, municipal, or private activity bonds.
5.   To approve a change to a fundamental investment restriction     One Group Prime
     which prohibits One Group Prime Money Market Fund from         Money Market Fund
     concentrating its investments in a single industry.
6.   To transact such other business as may properly come before        All Funds
     the Special Meeting.
</TABLE>
 
     One Group Mutual Funds as a whole must approve Proposals 1 and 2. This
means that the proposals will pass if approved by the lesser of: (a) 67% or more
of the outstanding shares of One Group Mutual Funds as a whole present at the
Special Meeting, if the holders of more than 50% of the outstanding shares are
present or represented by proxy, or (b) more than 50% of the outstanding shares
of One Group Mutual Funds as a whole.
 
     Proposal 3 requires approval by each Fund of One Group Mutual Funds. This
means that the change in a Fund's fundamental investment policy will be adopted
if approved by the lesser of: (a) 67% or more of the outstanding shares of that
Fund present at the Special Meeting, if the holders of more than 50% of the
outstanding shares are present or represented by proxy, or (b) more than 50% of
the outstanding shares of that Fund.
 
     Only shareholders in One Group Prime Money Market Fund will vote on
Proposals 4 and 5. The proposed changes in the Fund's fundamental investment
policies will be adopted if approved by the lesser of: (a) 67% or more of the
outstanding shares of One Group Prime Money Market Fund present at the Special
Meeting, if the holders of more than 50% of the outstanding shares are present
or represented by proxy, or (b) more than 50% of the outstanding shares of One
Group Prime Money Market Fund.
 
                                   PROPOSAL 1
 
                         Election of Board of Trustees
 
     At a meeting held on February 18, 1999, the incumbent Trustees, including
the Trustees who are not "interested persons", unanimously approved each nominee
to serve as a member of the Board of Trustees, subject to shareholder approval.
Five of the nominees currently serve as Trustees of One Group Mutual Funds. In
considering the nominees for election as Trustees of One Group Mutual Funds, the
incumbent Trustees took into account the qualifications of each of the nominees.
Because One Group Mutual Funds does not hold annual meetings, each nominee, if
elected, generally will serve until his or her successor is elected and
qualified.
 
     The Board of Trustees oversees the management and administration of the
Funds. The Trustees are responsible for making major decisions about each Fund's
investment objectives and policies, but delegate the day-to-day administration
of the Fund to the officers of the Trust. The Trustees, in turn, elect the
officers of the Funds.
 
                                        5
<PAGE>   6
 
     The incumbent Trustees and the nominees, their addresses, ages and
principal occupations during the past five years are set forth below.
 
<TABLE>
<CAPTION>
                                       POSITION HELD
                                         WITH THE
                                         ONE GROUP     PRINCIPAL OCCUPATION
NAME AND ADDRESS                AGE    MUTUAL FUNDS    DURING THE PAST FIVE YEARS
- ----------------                ---    -------------   --------------------------
<S>                             <C>    <C>             <C>
Peter C. Marshall               56      Trustee()C     President, DCI Marketing, Inc. (November, 1993 to
DCI Marketing, Inc.                                    present). Trustee of One Group Mutual Funds
2727 W. Good Hope Rd.                                  since 1983.
Milwaukee, WI 53209
 
Charles I. Post                 70      Trustee()C     Consultant (July, 1986 to present).
7615 4(th) Avenue West                                 Trustee of One Group Mutual Funds since 1983.
Bradenton, FL 34209
 
Frederick W. Ruebeck            59      Trustee()C     Director of Investments, Eli Lilly and Company
Eli Lilly & Company                                    (June, 1988 to present). Trustee of One Group
Lilly Corporate Center                                 Mutual Funds since 1990.
307 East McCarty
Indianapolis, IN 46258
 
Robert A. Oden, Jr.             52      Trustee()C     President, Kenyon College (1995 to present);
Office of the President                                Headmaster, The Hotchkiss School (1989 to 1995).
Ransom Hall                                            Trustee of One Group Mutual Funds since 1997.
Kenyon College
Gambier, OH 43022
 
John F. Finn*                   51      Trustee()C     President of Gardner, Inc. (1975 to present).
President                                              Trustee of One Group Mutual Funds since 1998.
Gardner, Inc.
1150 Chesapeake Ave
Columbus, Ohio 43212
 
Marilyn McCoy                   51          --         Vice President of Administration and Planning
Northwestern University                                Northwestern University (1985 to present).
Office of the Vice President                           Trustee of Pegasus Funds since 1996.
Administration & Planning
633 Clark St.-Crown 2-112
Evanston, IL 60208
 
Julius L. Pallone               68          --         President, J.L. Pallone Associates (1994 to present).
J.L. Pallone Associates                                Trustee of Pegasus Funds since 1987.
3000 Town Center
Suite 732
Southfield, MI 48075
 
Donald L. Tuttle                64          --         Vice President (1995 to present) and
Association for                                        Senior Vice President (1992 to 1995),
Management and                                         Association for Investment Management and
Research                                               Research. Trustee of Pegasus Funds since 1993.
5 Boar's Head Lane
Charlottesville, VA 22901
</TABLE>
 
- ---------
 
()C Incumbent Trustee.
 
*  John F. Finn is an "interested person" as that term is defined in the
   Investment Company Act of 1940 due to his ownership of shares of Bank One
   Corporation, the parent of the investment advisor to One Group Mutual Funds.
 
                                        6
<PAGE>   7
 
     The Trustees meet at least four times each year. During the most recent
fiscal year, the Trustees met five times. The incumbent Trustees attended all of
the Board meetings. While One Group Mutual Funds does not have standing audit
and compensation committees, its does have a standing nominating committee. The
nominating committee met two times during the fiscal year ended June 30, 1998.
Messrs. Marshall and Ruebeck are members of the nominating committee. The
nominating committee will consider nominees recommended by shareholders.
Recommendations should be submitted to the committee in care of One Group Mutual
Funds.
 
     The Trustees receive fees and expenses for each meeting of the Board of
Trustees attended. The Compensation Table below sets forth the total
compensation to the Trustees from One Group Mutual Funds for the fiscal year
ended June 30, 1998.
 
                               COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                           PENSION OR
                                           RETIREMENT
                         AGGREGATE      BENEFITS ACCRUED                         TOTAL
                        COMPENSATION       AS PART OF      ESTIMATED ANNUAL   COMPENSATION
NAME OF PERSON,        FROM ONE GROUP   ONE GROUP MUTUAL    BENEFITS UPON       FROM THE
POSITION                MUTUAL FUNDS    FUNDS' EXPENSES       RETIREMENT       COMPLEX(1)
- ---------------        --------------   ----------------   ----------------   ------------
<S>                    <C>              <C>                <C>                <C>
Peter C. Marshall,        $47,500          NA                 NA                $50,500
Trustee
 
Charles I. Post,          $45,500          NA                 NA                $48,500
Trustee
 
Frederick W. Ruebeck,     $45,500          NA                 NA                $48,500
Trustee
 
Robert A. Oden, Jr.,      $46,260          NA                 NA                $49,260
Trustee
 
John F. Finn,             $     0          NA                 NA                $     0
Trustee
</TABLE>
 
- ---------
 
(1)  "Complex" comprises the funds of One Group Mutual Funds, as well as the
     portfolios of One Group Investment Trust that were operational as of June
     30, 1998.
 
     Under a Deferred Compensation Plan for Trustees of One Group Mutual Funds
adopted at the November 20, 1998 Board of Trustees meeting, the Trustees may
defer all or a part of their compensation payable by One Group Mutual Funds and
earned by the Trustees for serving as a member of the Board of Trustees, or a
member of a committee of the Board. Reimbursement of expenses associated with
attending meetings of the Board or a committee of the Board may not be deferred.
Neither a specified length of service nor a vesting period are required by the
Plan. Under the Plan, the Trustees may specify Class I shares of one or more
funds of One Group Mutual Funds to be used to measure the performance of a
Trustee's deferred compensation account. A Trustee's deferred compensation
account will be paid at such times as elected by the Trustee subject to certain
mandatory payment provisions in the Plan (e.g., death of a Trustee). The Plan
does not obligate One Group Mutual Funds to purchase, hold or dispose of any
investments in order to satisfy its obligations under the Plan. However, if One
Group Mutual Funds does fund the Plan, all securities will be held solely in the
name of One Group Mutual Funds.
 
     The principal executive officers of One Group Mutual Funds are all officers
or employees of BISYS Fund Services, Inc. or its subsidiary, The One Group
Services Company. The One Group Services Company is One Group Mutual Funds'
administrator and distributor. The officers receive no compensation directly
from One
 
                                        7
<PAGE>   8
 
Group Mutual Funds for performing their duties. The officers of One Group Mutual
Funds, their addresses, and principal occupations during the past five years are
shown below.
 
<TABLE>
<CAPTION>
POSITION(S) HELD              PRINCIPAL OCCUPATION WITH
NAME AND ADDRESS               ONE GROUP MUTUAL FUNDS                  DURING PAST 5 YEARS
- ----------------              -------------------------    -------------------------------------------
<S>                           <C>                          <C>
 
Mark S. Redman                    President and            From November, 1997 to present, President,
The One Group                  Assistant Secretary         The One Group Services Company; From June,
Services Company                                           1995 to November, 1997, Officer, The One
3435 Stelzer Road                                          Group Services Company; From February, 1989
Columbus, Ohio 43219                                       to present, employee of BISYS Fund
Age: 44                                                    Services, Inc.
 
William J. Tomko                    Treasurer              From April, 1997 to present, Chief
BISYS Fund Services, Inc.                                  Operating Officer, BISYS Fund Services,
3435 Stelzer Road                                          Inc.; From April, 1987, to April, 1997,
Columbus, Ohio 43219                                       employee, Columbus, BISYS Fund Services,
Age: 40                                                    Inc.
 
Charles L. Booth                    Secretary              From February, 1998, to present, Chief
BISYS Fund Services, Inc.                                  Compliance Officer and Vice President Fund
3435 Stelzer Road                                          Administration BISYS Fund Services, Inc.;
Columbus, Ohio 43219                                       From April, 1988, to February, 1998,
Age: 38                                                    employee, BISYS Fund Services, Inc.
 
Alaina J. Metz                 Assistant Secretary         From June 1995 to present, Chief
BISYS Fund Services, Inc.                                  Administrator, Administration and
3435 Stelzer Road                                          Regulatory Services, BISYS Fund Services,
Columbus, Ohio 43219                                       Inc.; from May 1989 to June 1995,
Age: 31                                                    Supervisor, Mutual Fund Legal Department,
                                                           Alliance Capital Management.
</TABLE>
 
     The Trustees and officers of One Group Mutual Funds own less than 1% of the
outstanding shares of One Group Mutual Funds.
 
              THE TRUSTEES UNANIMOUSLY RECOMMEND THAT SHAREHOLDERS
                         VOTE FOR EACH OF THE NOMINEES
 
                                   PROPOSAL 2
 
                      Selection of Independent Accountants
 
     At a meeting held on February 18, 1999, the Trustees, including the
Trustees who are not "interested persons", unanimously approved the selection of
PricewaterhouseCoopers LLP as the independent accountants for the fiscal year
ending June 30, 1999.
 
     The firm of PricewaterhouseCoopers LLP, formed as a result of the merger of
Price Waterhouse, LLP and Coopers & Lybrand, LLP, has extensive experience in
investment company accounting and auditing and has served as independent
accountants to One Group Mutual Funds since its inception. The financial
statements included in One Group Mutual Funds' Annual Report have been examined
by PricewaterhouseCoopers LLP. It is not expected that a representative of
PricewaterhouseCoopers LLP will be present at the meeting.
 
     PricewaterhouseCoopers LLP and its members do not have any direct or
indirect material financial interest in or connection with One Group Mutual
Funds in any capacity other than as independent accountants.
 
              THE TRUSTEES UNANIMOUSLY RECOMMEND THAT SHAREHOLDERS
              VOTE FOR THE SELECTION OF PRICEWATERHOUSECOOPERS LLP
 
                                        8
<PAGE>   9
 
                                   PROPOSAL 3
 
          Approval of a Change to a Fundamental Investment Restriction
            Which Prohibits Participation in Joint Trading Accounts
 
     The Board of Trustees is submitting for approval by shareholders of each
Fund of One Group Mutual Funds a proposal to amend a fundamental investment
restriction. The current restriction and the proposed revision are as follows:
 
     Current Restriction:   "None of the [Funds of One Group Mutual Funds] may
                            purchase securities on margin, sell securities
                            short, or participate on a joint or joint and
                            several basis in any securities trading account."
 
     Proposed Restriction:  "None of the Funds of One Group Mutual Funds may
                            purchase securities on margin or sell securities
                            short."
 
     The Board approved this proposal at a meeting held on February 18, 1999.
Fundamental investment restrictions may be changed only with shareholder
approval. Approval of this proposal will not result in a change in a Fund's
investment objective or investment management.
 
     Currently, none of the Funds may participate on a joint or joint and
several basis in any securities trading account. The proposed change would allow
each Fund to realize certain efficiencies and cost savings, while earning a
potentially higher rate of return on repurchase agreements and other short-term,
money market-type investments. Many securities of this type are sold in
denominations which are too large for the Funds to purchase on an individual
basis. Purchasing these securities on a joint basis will expand the investment
opportunities available to the Funds and may reduce the possibility that cash
balances remain uninvested. In addition, joint transactions can be expected to
result in certain administrative efficiencies by reducing the number of trade
tickets and cash wires that must be processed for each trade. These efficiencies
may result in reduced transaction costs.
 
     Each Fund participating in a joint transaction will be subject to certain
requirements imposed by the United States Securities and Exchange Commission.
These requirements are intended to ensure that each Fund's interests are
protected and that each Fund's participation is on a fair and equal basis. In
addition, each Fund's liability will be limited to its interest in the
investment; no Fund will be jointly liable for the investments of any other
Fund.
 
              THE TRUSTEES UNANIMOUSLY RECOMMEND THAT SHAREHOLDERS
                             VOTE FOR THIS PROPOSAL
 
                                   PROPOSAL 4
 
 Elimination of a Fundamental Investment Restriction Which Prohibits One Group
                            Prime Money Market Fund
         from Investing in State, Municipal, or Private Activity Bonds
 
     One Group Prime Money Market Fund currently is prohibited from investing in
municipal securities. These are securities issued by a state or political
subdivision to obtain funds for various public purposes. Municipal securities
include private activity bonds and industrial development bonds, as well as
General Obligation Notes, Tax Anticipation Notes, Bond Anticipation Notes,
Revenue Anticipation Notes, Project Notes, other short-term municipal
obligations, municipal leases, and obligations of municipal housing authorities
and single family revenue bonds. Municipal securities produce income that is
exempt from Federal income tax.
 
     Investments in municipal securities involve the following risks:
 
     -  Credit Risk. The risk that the issuer of a security, or the counterparty
        to a contract, will default or otherwise become unable to honor a
        financial obligation. The price of a security can be adversely affected
        prior to actual default as its credit status deteriorates and the
        probability of default rises.
 
     -  Market Risk. The risk that the market value of a security may move up
        and down, sometimes rapidly and unpredictably. These fluctuations may
        cause a security to be worth less than it was worth at an earlier time.
        Market risk may affect a single issuer, industry, sector of the economy
        or the market as a
                                        9
<PAGE>   10
 
        whole. For fixed income securities, market risk is largely, but not
        exclusively, influenced by changes in interest rates. A rise in interest
        rates typically causes a fall in values, while a fall in rates typically
        causes a rise in values. Finally, key information about a security or
        market may be inaccurate or unavailable.
 
     -  Political Risk. The risk of losses attributable to unfavorable
        governmental or political actions, seizure of foreign deposits, changes
        in tax or trade statutes, and governmental collapse and war.
 
     -  Tax Risk. The risk that the issuer of the securities will fail to comply
        with certain requirements of the Internal Revenue Code, which would
        cause adverse tax consequences.
 
     -  Regulatory Risk. The risk associated with Federal and state laws which
        may restrict the remedies that a lender has when a borrower defaults on
        loans. These laws include restrictions on foreclosures, redemption
        rights after foreclosure, Federal and state bankruptcy and debtor relief
        laws, restrictions on "due on sale" clauses, and state usury laws.
 
     The Board of Trustees approved the elimination of this investment
restriction at a meeting on February 18, 1999. Elimination of the investment
restriction on purchasing state, municipal and private activity bonds will
provide Banc One Investment Advisors Corporation with flexibility in making
investment decisions on behalf of the Fund and expand the Fund's investment
opportunities. One Group Prime Money Market Fund currently anticipates that
investments in municipal securities generally will not exceed 5% of the Fund's
total assets. Of course, the Fund may invest a larger percentage in municipal
securities if market conditions warrant.
 
              THE TRUSTEES UNANIMOUSLY RECOMMEND THAT SHAREHOLDERS
                             VOTE FOR THIS PROPOSAL
 
                                   PROPOSAL 5
 
Approval of a Change to a Fundamental Investment Restriction Which Prohibits One
                                     Group
Prime Money Market Fund from Concentrating its Investments in a Single Industry
 
     As a matter of fundamental policy, One Group Prime Money Market Fund
currently may not concentrate its investments in the securities of one or more
issuers conducting their principal business in a particular industry or group of
industries. A mutual fund's investments are considered to be concentrated in a
particular industry if more than 25% of the fund's assets are invested in that
industry. One Group Prime Money Market Fund's current policy does not apply to
obligations issued or guaranteed by the U.S. government or its agencies and
instrumentalities and repurchase agreements involving such securities, domestic
bank certificates of deposit or bankers' acceptance, municipal securities or
governmental guarantees of municipal securities. For purposes of this
restriction, private activity bonds backed only by the assets and revenues of
non-governmental issuers are not considered municipal securities. In addition,
under the current policy wholly-owned finance companies are considered to be in
the industries of their parents if their activities are primarily related to
financing the activities of their parent.
 
     The current restriction and the proposed revision are as follows:
 
     Current Restriction:     The Prime Money Market Fund will not concentrate
                              its investments in the securities of one or more
                              issuers conducting their principal business in a
                              particular industry or group of industries.
 
     Proposed Restriction:   The Prime Money Market Fund will not concentrate
                             its investments in the securities of one or more
                             issuers conducting their principal business in a
                             particular industry or group of industries (except
                             that the Fund may concentrate its investments in
                             securities issued by companies in the financial
                             services industry.)
 
     The Board of Trustees approved a change in the Fund's investment
restrictions at a meeting on February 18, 1999. If shareholders approve this
change to the Fund's concentration policy, at least 25% of the Fund's total
assets will be invested in securities issued by companies in the financial
services industry, although the Fund may temporarily invest less than 25% of its
total assets in that industry if warranted due to adverse economic conditions,
and if consistent with the best interests of shareholders. The financial
services industry includes, but is
                                       10
<PAGE>   11
 
not limited to, banks, broker-dealers, finance companies and other issuers of
asset-backed securities. Securities issued by these companies include bankers'
acceptances, certificates of deposit, and asset-backed securities, including
commercial paper. It is currently anticipated that asset-backed securities will
constitute a significant percentage of the Fund's investments as a result of
this change in investment policy. The assets underlying asset-backed securities
will consist, among other things, of credit card receivables, leases, and auto
and home equity loans. Asset-backed securities have become the dominate type of
money market-eligible securities issued over the last several years. The Fund
may be able to produce higher yields and increase per issuer diversification by
concentrating in the financial services industry. Because a greater number of
issuers are participating in the asset-backed market, the Fund's reliance on
relatively few corporate issuers will be reduced. Because the Fund's current
investment restriction limits its ability to invest in these securities it will
become increasingly difficult to invest Fund assets efficiently and effectively.
The Fund will not purchase securities issued by Bank One Corporation or any of
its affiliates.
 
     Concentration in obligations issued by the financial services industry may
involve a greater exposure to economic, business, political or regulatory
developments that may be adverse to the financial services industry. Such
developments could involve the following risks:
 
     -  Credit Risk. The risk that the issuer of a security, or the counterparty
        to a contract, will default or otherwise become unable to honor a
        financial obligation. The price of a security can be adversely affected
        prior to actual default as its credit status deteriorates and the
        probability of default rises.
 
     -  Market Risk. The risk that the market value of a security may move up
        and down, sometimes rapidly and unpredictably. These fluctuations may
        cause a security to be worth less than the price originally paid for it,
        or less than it was worth at an earlier time. Market risk may affect a
        single issuer, industry, sector of the economy or the market as a whole.
        There is also the risk that the current interest rate may not accurately
        reflect existing market rates. For fixed income securities, market risk
        is largely, but not exclusively, influenced by changes in interest
        rates. A rise in interest rates typically causes a fall in values, which
        a fall in rates typically causes a rise in values. Finally, key
        information about security or market may be inaccurate or unavailable.
 
     -  Pre-Payment Risk. The risk that the principal repayment of a security
        will occur at an unexpected time, especially that the repayment of an
        asset-backed security occurs either significantly sooner or later than
        expected. Changes in pre-payment rates can result in greater price and
        yield volatility. When obligations are pre-paid, the Fund may have to
        reinvest in securities with a lower yield. Further, with early
        prepayment, the Fund may fail to recover any premium paid, resulting in
        an unexpected capital loss.
 
     -  Regulatory Risk. The risk associated with Federal and state laws which
        may restrict the remedies that a lender has when a borrower defaults on
        loans. These laws include restrictions on foreclosures, redemption
        rights after foreclosure, Federal and state bankruptcy and debtor relief
        laws, restrictions on "due on sale" clauses, and state usury laws.
 
     Under Section 13(a)(3) of the Investment Company Act of 1940, once a mutual
fund declares a policy of concentrating its investments in a particular industry
or group of industries, it may not change that policy without shareholder
approval. Despite this change in policy, the Fund will continue to be subject to
Section 12(d)(3) and Rule 12d3-1 of the Investment Company Act of 1940 which
serves to limit a mutual fund's ability to purchase securities of
broker-dealers, underwriters and investment advisors.
 
              THE TRUSTEES UNANIMOUSLY RECOMMEND THAT SHAREHOLDERS
                             VOTE FOR THIS PROPOSAL
 
                                       11
<PAGE>   12
 
                             ADDITIONAL INFORMATION
 
The following list shows beneficial ownership by shareholders who, to the best
knowledge of One Group Mutual Funds, own more than 5% of the outstanding shares
of the Funds as of March 11, 1999:
 
<TABLE>
<CAPTION>
                                                                      AMOUNT AND
                                            NAME AND ADDRESS     NATURE OF BENEFICIAL   PERCENTAGE
TITLE OF CLASS                             OF BENEFICIAL OWNER        OWNERSHIP          OF CLASS
- --------------                             -------------------   --------------------   ----------
<S>                                        <C>                   <C>                    <C>
 
</TABLE>
 
The following list shows beneficial ownership of the Funds by the Trustees,
nominees, and officers individually, as well as the beneficial ownership by the
Trustees and officers as a group:
 
<TABLE>
<CAPTION>
                                                                      AMOUNT AND
                                            NAME AND ADDRESS     NATURE OF BENEFICIAL   PERCENTAGE
TITLE OF CLASS                             OF BENEFICIAL OWNER        OWNERSHIP          OF CLASS
- --------------                             -------------------   --------------------   ----------
<S>                                        <C>                   <C>                    <C>
 
</TABLE>
 
     The Trustees know of no matters to be presented at the Special Meeting
other than those specified in the attached Notice of Meeting. However, if any
other matters come before the Special Meeting, it is intended that the proxies
will vote in their discretion.
 
Dated: April __, 1999
 
     IF YOU DO NOT EXPECT TO ATTEND THE SPECIAL MEETING, PLEASE SIGN YOUR PROXY
CARD AND RETURN IT PROMPTLY IN THE ENCLOSED ENVELOPE TO AVOID UNNECESSARY
EXPENSE AND DELAY. FOR YOUR CONVENIENCE, NO POSTAGE IS NECESSARY IF MAILED IN
THE UNITED STATES.
 
                                       12
<PAGE>   13
                    ONE GROUP(R) MUNICIPAL MONEY MARKET FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY 17, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Municipal
Money Market Fund (the "Fund") on May 17, 1999 at 3:00 p.m., Eastern Standard
Time, and at any adjournments thereof, all of the units of beneficial interest
in the Fund which the undersigned would be entitled to vote upon if personally
present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN
         as a group                 (  )     (  )        (  )

         Peter C. Marshall          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                                              
         Charles I. Post            FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                                              
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                                              
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                                              
         John F. Finn               FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                                              
         Marilyn McCoy              FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                                              
         Julius L. Pallone          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                                              
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

<PAGE>   14




3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )
4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   15



                      ONE GROUP(R) PRIME MONEY MARKET FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Prime
Money Market Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard
Time, and at any adjournments thereof, all of the units of beneficial interest
in the Fund which the undersigned would be entitled to vote upon if personally
present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN
         as a group                 (  )     (  )        (  ) 
                                    
         Peter C. Marshall          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Charles I. Post            FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         John F. Finn               FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Marilyn McCoy              FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Julius L. Pallone          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   16



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       Approval of the elimination of fundamental investment restriction which
         prohibits the Fund from investing in state, municipal, or private
         activity bonds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

5.       Approval of the following revised fundamental investment restriction of
         the Fund:

         The Prime Money Market Fund will not concentrate its investments in the
         securities of one or more issuers conducting their principal business
         in a particular industry or group of industries (expect that the Fund
         may concentrate its investments in securities issued by companies in
         the financial services industry).

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


6.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   17


                 ONE GROUP(R) OHIO MUNICIPAL MONEY MARKET FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Ohio
Municipal Money Market Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern
Standard Time, and at any adjournments thereof, all of the units of beneficial
interest in the Fund which the undersigned would be entitled to vote upon if
personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN
         as a group                 (  )     (  )        (  ) 
                                    
         Peter C. Marshall          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Charles I. Post            FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         John F. Finn               FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Marilyn McCoy              FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Julius L. Pallone          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   18



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )
4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   19


            ONE GROUP(R) U.S. TREASURY SECURITIES MONEY MARKET FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group U.S.
Treasury Securities Money Market Fund (the "Fund") on May __ , 1999 at 3:00
p.m., Eastern Standard Time, and at any adjournments thereof, all of the units
of beneficial interest in the Fund which the undersigned would be entitled to
vote upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN
         as a group                 (  )     (  )        (  ) 
                                    
         Peter C. Marshall          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Charles I. Post            FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         John F. Finn               FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Marilyn McCoy              FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Julius L. Pallone          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

<PAGE>   20



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN   
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   21


                   ONE GROUP(R) GOVERNEMENT MONEY MARKET FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Government
Money Market Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard
Time, and at any adjournments thereof, all of the units of beneficial interest
in the Fund which the undersigned would be entitled to vote upon if personally
present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN
         as a group                 (  )     (  )        (  ) 
                                    
         Peter C. Marshall          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Charles I. Post            FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         John F. Finn               FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Marilyn McCoy              FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Julius L. Pallone          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   22



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE




<PAGE>   23


                       ONE GROUP(R) LARGE CAP GROWTH FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Large Cap
Growth Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard Time,
and at any adjournments thereof, all of the units of beneficial interest in the
Fund which the undersigned would be entitled to vote upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN
         as a group                 (  )     (  )        (  ) 
                                    
         Peter C. Marshall          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Charles I. Post            FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         John F. Finn               FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Marilyn McCoy              FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Julius L. Pallone          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   24



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   25


                        ONE GROUP(R) LARGE CAP VALUE FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Large Cap
Value Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard Time,
and at any adjournments thereof, all of the units of beneficial interest in the
Fund which the undersigned would be entitled to vote upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN
         as a group                 (  )     (  )        (  ) 
                                    
         Peter C. Marshall          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Charles I. Post            FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         John F. Finn               FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Marilyn McCoy              FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Julius L. Pallone          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   26



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   27


                        ONE GROUP(R) MID CAP GROWTH FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Mid Cap
Growth Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard Time,
and at any adjournments thereof, all of the units of beneficial interest in the
Fund which the undersigned would be entitled to vote upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN
         as a group                 (  )     (  )        (  ) 
                                    
         Peter C. Marshall          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Charles I. Post            FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         John F. Finn               FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Marilyn McCoy              FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Julius L. Pallone          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   28



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   29


                         ONE GROUP(R) MID CAP VALUE FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Mid Cap
Value Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard Time,
and at any adjournments thereof, all of the units of beneficial interest in the
Fund which the undersigned would be entitled to vote upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN
         as a group                 (  )     (  )        (  ) 
                                    
         Peter C. Marshall          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Charles I. Post            FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         John F. Finn               FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Marilyn McCoy              FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Julius L. Pallone          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   30



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   31


                  ONE GROUP(R) INTERNATIONAL EQUITY INDEX FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group
International Equity Index Fund (the "Fund") on May __ , 1999 at 3:00 p.m.,
Eastern Standard Time, and at any adjournments thereof, all of the units of
beneficial interest in the Fund which the undersigned would be entitled to vote
upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN
         as a group                 (  )     (  )        (  ) 
                                    
         Peter C. Marshall          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Charles I. Post            FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         John F. Finn               FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Marilyn McCoy              FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Julius L. Pallone          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   32



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   33


                         ONE GROUP(R) EQUITY INDEX FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Equity
Index Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard Time,
and at any adjournments thereof, all of the units of beneficial interest in the
Fund which the undersigned would be entitled to vote upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN
         as a group                 (  )     (  )        (  ) 
                                    
         Peter C. Marshall          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Charles I. Post            FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         John F. Finn               FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Marilyn McCoy              FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Julius L. Pallone          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   34



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   35


                         ONE GROUP(R) EQUITY INCOME FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Equity
Income Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard Time,
and at any adjournments thereof, all of the units of beneficial interest in the
Fund which the undersigned would be entitled to vote upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN
         as a group                 (  )     (  )        (  ) 
                                    
         Peter C. Marshall          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Charles I. Post            FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         John F. Finn               FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Marilyn McCoy              FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Julius L. Pallone          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   36



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   37


                      ONE GROUP(R) DIVERSIFIED EQUITY FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group
Diversified Equity Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern
Standard Time, and at any adjournments thereof, all of the units of beneficial
interest in the Fund which the undersigned would be entitled to vote upon if
personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN
         as a group                 (  )     (  )        (  ) 
                                    
         Peter C. Marshall          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Charles I. Post            FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         John F. Finn               FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Marilyn McCoy              FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Julius L. Pallone          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   38



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   39


                       ONE GROUP(R) SMALL CAP GROWTH FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Small Cap
Growth Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard Time,
and at any adjournments thereof, all of the units of beneficial interest in the
Fund which the undersigned would be entitled to vote upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN
         as a group                 (  )     (  )        (  ) 
                                    
         Peter C. Marshall          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Charles I. Post            FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         John F. Finn               FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Marilyn McCoy              FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Julius L. Pallone          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   40



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   41


                       ONE GROUP(R) INTERMEDIATE BOND FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group
Intermediate Bond Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern
Standard Time, and at any adjournments thereof, all of the units of beneficial
interest in the Fund which the undersigned would be entitled to vote upon if
personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN
         as a group                 (  )     (  )        (  ) 
                                    
         Peter C. Marshall          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Charles I. Post            FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         John F. Finn               FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Marilyn McCoy              FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Julius L. Pallone          FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 
                                    
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN
                                    (  )     (  )        (  ) 

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   42



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   43


                          ONE GROUP(R) INCOME BOND FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Income
Bond Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard Time, and
at any adjournments thereof, all of the units of beneficial interest in the Fund
which the undersigned would be entitled to vote upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )



<PAGE>   44


3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   45


                        ONE GROUP(R) GOVERNMENT BOND FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Government
Bond Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard Time, and
at any adjournments thereof, all of the units of beneficial interest in the Fund
which the undersigned would be entitled to vote upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   46



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE




<PAGE>   47


                     ONE GROUP(R) ULTRA SHORT-TERM BOND FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Ultra
Short-Term Bond Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern
Standard Time, and at any adjournments thereof, all of the units of beneficial
interest in the Fund which the undersigned would be entitled to vote upon if
personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   48



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   49


                        ONE GROUP(R) SHORT-TERM BOND FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Short-Term
Bond Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard Time, and
at any adjournments thereof, all of the units of beneficial interest in the Fund
which the undersigned would be entitled to vote upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

<PAGE>   50




3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   51


                       ONE GROUP(R) TREASURY & AGENCY FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Treasury &
Agency Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard Time,
and at any adjournments thereof, all of the units of beneficial interest in the
Fund which the undersigned would be entitled to vote upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   52



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE



<PAGE>   53


                        ONE GROUP(R) HIGH YIELD BOND FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group High Yield
Bond Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard Time, and
at any adjournments thereof, all of the units of beneficial interest in the Fund
which the undersigned would be entitled to vote upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )



<PAGE>   54




3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   55


                  ONE GROUP(R) INTERMEDIATE TAX-FREE BOND FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group
Intermediate Tax-Free Bond Fund (the "Fund") on May __ , 1999 at 3:00 p.m.,
Eastern Standard Time, and at any adjournments thereof, all of the units of
beneficial interest in the Fund which the undersigned would be entitled to vote
upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   56





3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   57


                       ONE GROUP(R) MUNICIPAL INCOME FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Municipal
Income Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard Time,
and at any adjournments thereof, all of the units of beneficial interest in the
Fund which the undersigned would be entitled to vote upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   58





3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   59


                    ONE GROUP(R) ARIZONA MUNICIPAL BOND FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Arizona
Municipal Bond Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard
Time, and at any adjournments thereof, all of the units of beneficial interest
in the Fund which the undersigned would be entitled to vote upon if personally
present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )



<PAGE>   60




3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE




<PAGE>   61


                 ONE GROUP(R) WEST VIRGINIA MUNICIPAL BOND FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group West
Virginia Municipal Bond Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern
Standard Time, and at any adjournments thereof, all of the units of beneficial
interest in the Fund which the undersigned would be entitled to vote upon if
personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

<PAGE>   62


3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   63


                   ONE GROUP(R) LOUISIANA MUNICIPAL BOND FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Louisiana
Municipal Bond Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard
Time, and at any adjournments thereof, all of the units of beneficial interest
in the Fund which the undersigned would be entitled to vote upon if personally
present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

<PAGE>   64


3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   65


                      ONE GROUP(R) OHIO MUNICIPAL BOND FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Ohio
Municipal Bond Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard
Time, and at any adjournments thereof, all of the units of beneficial interest
in the Fund which the undersigned would be entitled to vote upon if personally
present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )



<PAGE>   66


3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   67


                    ONE GROUP(R) KENTUCKY MUNICIPAL BOND FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Kentucky
Municipal Bond Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard
Time, and at any adjournments thereof, all of the units of beneficial interest
in the Fund which the undersigned would be entitled to vote upon if personally
present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   68


3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   69


                        ONE GROUP(R) INVESTOR GROWTH FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Investor
Growth Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard Time,
and at any adjournments thereof, all of the units of beneficial interest in the
Fund which the undersigned would be entitled to vote upon if personally present.

  1. Election of the Board of Trustees of One Group Mutual Funds as set forth
below. If you wish to withhold authority to vote for all the nominees as group,
or any individual nominee, please mark the box labeled "Abstain" opposite the
nominees name. IF YOU MARK YOUR BALLOT IN SUCH A WAY THAT YOU DO NOT WITHHOLD
AUTHORITY TO VOTE FOR A NOMINEE, YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF
THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )


<PAGE>   70



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   71


                   ONE GROUP(R) INVESTOR GROWTH & INCOME FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Investor
Growth & Income Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern
Standard Time, and at any adjournments thereof, all of the units of beneficial
interest in the Fund which the undersigned would be entitled to vote upon if
personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )




<PAGE>   72



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE


<PAGE>   73


                 ONE GROUP(R) INVESTOR CONSERVATIVE GROWTH FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Investor
Conservative Growth Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern
Standard Time, and at any adjournments thereof, all of the units of beneficial
interest in the Fund which the undersigned would be entitled to vote upon if
personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )



<PAGE>   74



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE



<PAGE>   75
                      ONE GROUP(R) INVESTOR BALANCED FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Investor
Balanced Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard Time,
and at any adjournments thereof, all of the units of beneficial interest in the
Fund which the undersigned would be entitled to vote upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )



<PAGE>   76



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE





<PAGE>   77
                           ONE GROUP(R) BALANCED FUND

                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Balanced
Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern Standard Time, and at
any adjournments thereof, all of the units of beneficial interest in the Fund
which the undersigned would be entitled to vote upon if personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )



<PAGE>   78



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE





<PAGE>   79
                  ONE GROUP(R) TREASURY ONLY MONEY MARKET FUND
                                        
                         PROXY FOR A SPECIAL MEETING OF
                           SHAREHOLDERS, MAY __, 1999

THIS PROXY IS SOLICITED ON BEHALF OF THE TRUSTEES OF ONE GROUP MUTUAL FUNDS.

The undersigned hereby appoints Mark S. Redman and Charles L. Booth, each of
them with full power of substitution as proxies of the undersigned, to vote, as
designated below, at the Special Meeting of Shareholders of One Group Treasury
Only Money Market Fund (the "Fund") on May __ , 1999 at 3:00 p.m., Eastern
Standard Time, and at any adjournments thereof, all of the units of beneficial
interest in the Fund which the undersigned would be entitled to vote upon if
personally present.

1.       Election of the Board of Trustees of One Group Mutual Funds as set
         forth below. If you wish to withhold authority to vote for all the
         nominees as group, or any individual nominee, please mark the box
         labeled "Abstain" opposite the nominees name. IF YOU MARK YOUR BALLOT
         IN SUCH A WAY THAT YOU DO NOT WITHHOLD AUTHORITY TO VOTE FOR A NOMINEE,
         YOU WILL BE DEEMED TO HAVE VOTED IN FAVOR OF THE NOMINEE.

         All of the nominees        FOR     AGAINST    ABSTAIN 
         as a group                 (  )     (  )        (  )  
                                                               
         Peter C. Marshall          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Charles I. Post            FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Frederick W. Ruebeck       FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Robert A. Oden, Jr.        FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         John F. Finn               FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Marilyn McCoy              FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Julius L. Pallone          FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  
                                                               
         Donald L. Tuttle           FOR     AGAINST    ABSTAIN 
                                    (  )     (  )        (  )  

2.       Ratification of PricewaterhouseCoopers LLP as the independent
         accountants for One Group Mutual Funds.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )



<PAGE>   80



3.       Approval of the following revised fundamental investment restriction of
         the Fund:

         None of the Funds of One Group Mutual Funds may purchase securities on
         margin or sell securities short.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

4.       To transact any other business as properly comes before the Meeting or
         any adjournment thereof.

                             FOR               AGAINST               ABSTAIN
                             (  )               (  )                   (  )

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY
THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR EACH PROPOSAL. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON
SUCH OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING. THE TRUSTEES
RECOMMEND A VOTE FOR THE PROPOSALS ON THE REVERSE SIDE.

NOTE: Please sign exactly as the name appears on this card. EACH joint owner
must sign the Proxy. When signing as executor, administrator, attorney, trustee
or guardian, or as custodian for a minor, please give the FULL title of such. If
a corporation, please give the FULL corporate name and indicate the signer's
office. If a partner, please sign in the partnership name.


- ------------------------------------------
Signature of Shareholder(s)


- ------------------------------------------
Signature of Shareholder(s)


Dated:  ________________________________ , 1999.



                PLEASE EXECUTE, SIGN, DATE, AND RETURN THIS PROXY
                      PROMPTLY USING THE ENCLOSED ENVELOPE





<PAGE>   81





TWO QUICK AND EASY WAYS TO VOTE YOUR PROXY INSTANTLY

As a valued One Group Mutual Funds shareholder, your proxy vote is important to
us. That's why we've made it faster and easier to vote your proxy at your
convenience, 24 hours a day. After reviewing the enclosed Proxy Statement, which
outlines important issues affecting your fund, select one of the following quick
and easy methods to register your vote - accurately and immediately.

VOTE ON-LINE

1.       Read the enclosed Proxy Statement and have your Proxy Card* at hand.
2.       Go to Web site WWW.PROXYVOTE.COM.
3.       Enter the 12-digit Control Number found on your Proxy Card.
4.       Cast your vote using the easy-to-follow instructions.

VOTE BY TOLL-FREE PHONE CALL
1.       Read the enclosed Proxy Statement and have your Proxy Card* at hand.
2.       Call the toll-free number found on your Proxy Card.
3.       Enter the 12-digit Control Number found on your Proxy Card.
4.       Cast your vote using the easy-to-follow instructions.

*DO NOT MAIL THE PROXY CARD IF VOTING BY INTERNET OR TELEPHONE.






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