SERVICE PLAN AND AGREEMENT

                                      with

                       OppenheimerFunds Distributor, Inc.

                              For Class P Shares of

                   Oppenheimer Institutional Money Market Fund


This Service Plan and Agreement (the "Plan") is dated as of the 19th day of
April, 2006, by and between Oppenheimer Institutional Money Market Fund (the
"Fund") and OppenheimerFunds Distributor, Inc. (the "Distributor").

1. The Plan. This Plan is the Fund's written service plan for its Class P Shares
described in the Fund's registration statement as of the date this Plan takes
effect, contemplated by and to comply with Rule 2830 of the Conduct Rules of the
National Association of Securities Dealers, Inc., pursuant to which the Fund
will reimburse the Distributor for a portion of its costs incurred in connection
with the personal service and maintenance of shareholder accounts ("Accounts")
that hold Class P Shares (the "Shares") of the Fund. The Fund may be deemed to
be acting as distributor of securities of which it is the issuer, pursuant to
Rule 12b-1 under the Investment Company Act of 1940 (the "1940 Act"), according
to the terms of this Plan. The Distributor is authorized under the Plan to pay
"Recipients," as hereinafter defined, for rendering services and for the
maintenance of Accounts. Such Recipients are intended to have certain rights as
third-party beneficiaries under this Plan.

2. Definitions. As used in this Plan, the following terms shall have the
following meanings:

         (a) "Recipient" shall mean any broker, dealer, bank or other
         institution which: (i) has rendered services in connection with the
         personal service and maintenance of Accounts; (ii) shall furnish the
         Distributor (on behalf of the Fund) with such information as the
         Distributor shall reasonably request to answer such questions as may
         arise concerning such service; and (iii) has been selected by the
         Distributor to receive payments under the Plan. Notwithstanding the
         foregoing, a majority of the Fund's Board of Trustees (the "Board") who
         are not "interested persons" (as defined in the 1940 Act) and who have
         no direct or indirect financial interest in the operation of this Plan
         or in any agreements relating to this Plan (the "Independent Trustees")
         may remove any broker, dealer, bank or other institution as a
         Recipient, whereupon such entity's rights as a third-party beneficiary
         hereof shall terminate.

         (b) "Qualified Holdings" shall mean, as to any Recipient, all Shares
         owned beneficially or of record by: (i) such Recipient, or (ii) such
         brokerage or other customers, or investment advisory or other clients
         of such Recipient and/or accounts as to which such Recipient is a
         fiduciary or custodian or co-fiduciary or co-custodian (collectively,
         the "Customers"), but in no event shall any such Shares be deemed owned
         by more than one Recipient for purposes of this Plan. In the event that
         two entities would otherwise qualify as Recipients as to the same
         Shares, the Recipient which is the dealer of record on the Fund's books
         shall be deemed the Recipient as to such Shares for purposes of this
         Plan.

3.       Payments.

         (a) Under the Plan, the Fund will make payments to the Distributor,
         within forty-five (45) days of the end of each calendar quarter or at
         such other interval as deemed appropriate by the Distributor, in the
         amount of the lesser of: (i) 0.25% on an annual basis of the average
         during the calendar quarter of the aggregate net asset value of the
         Shares, computed as of the close of each business day, or (ii) the
         Distributor's actual expenses under the Plan for that quarter of the
         type approved by the Board. Notwithstanding the foregoing, the Fund
         will not make payments to the Distributor in excess of the amount the
         Distributor pays to Recipients. The Distributor will use such fee
         received from the Fund in its entirety to reimburse itself for payments
         to Recipients and for its other expenditures and costs of the type
         approved by the Board incurred in connection with the personal service
         and maintenance of Accounts including, but not limited to, the services
         described in the following paragraph. The Distributor may make Plan
         payments to any "affiliated person" (as defined in the 1940 Act) of the
         Distributor if such affiliated person qualifies as a Recipient.

                  The services to be rendered by the Distributor and Recipients
         in connection with the personal service and the maintenance of Accounts
         may include, but shall not be limited to, the following: answering
         routine inquiries from the Recipient's customers concerning the Fund,
         providing such customers with information on their investment in
         Shares, assisting in the establishment and maintenance of accounts or
         sub-accounts in the Fund, making the Fund's investment plans and
         dividend payment options available, and providing such other
         information and customer liaison services and the maintenance of
         Accounts as the Distributor or the Fund may reasonably request. It may
         be presumed that a Recipient has provided services qualifying for
         compensation under the Plan if it has Qualified Holdings of Shares to
         entitle it to payments under the Plan. In the event that either the
         Distributor or the Board should have reason to believe that,
         notwithstanding the level of Qualified Holdings, a Recipient may not be
         rendering appropriate services, then the Distributor, at the request of
         the Board, shall require the Recipient to provide a written report or
         other information to verify that said Recipient is providing
         appropriate services in this regard. If the Distributor still is not
         satisfied, it may take appropriate steps to terminate the Recipient's
         status as such under the Plan, whereupon such entity's rights as a
         third-party beneficiary hereunder shall terminate.

                  Payments received by the Distributor from the Fund under the
         Plan will not be used to pay any interest expense, carrying charges or
         other financial costs, or allocation of overhead by the Distributor, or
         for any other purpose other than for the payments described in this
         Section 3. The amount payable to the Distributor each quarter or other
         period will be reduced to the extent that reimbursement payments
         otherwise permissible under the Plan have not been authorized by the
         Board for that period. Any unreimbursed expenses incurred for any
         quarter by the Distributor may not be recovered in later periods.

(b)      The  Distributor  shall make  payments  to any  Recipient  quarterly  or at such other  interval as deemed
         appropriate by the Distributor,  within  forty-five (45) days of the end of each calendar quarter or other
         such period,  at a rate not to exceed 0.25% on an annual basis of the average during the calendar  quarter
         of the  aggregate  net asset  value of the  Shares  computed  as of the  close of each  business  day,  of
         Qualified  Holdings  owned  beneficially  or of record by the Recipient or by its Customers.  However,  no
         such payments  shall be made to any  Recipient for any such period in which its Qualified  Holdings do not
         equal or exceed, at the end of such quarter,  the minimum amount ("Minimum Qualified  Holdings"),  if any,
         to be set from time to time by a majority of the Independent Trustees.

                  Alternatively, the Distributor may, at its sole option, make
         the following service fee payments to any Recipient quarterly or at
         such other interval as deemed appropriate by the Distributor, within
         forty-five (45) days of the end of each calendar quarter or other such
         period: (A) "Advance Service Fee Payments" at a rate not to exceed
         0.25% of the average during the calendar quarter of the aggregate net
         asset value of Shares, computed as of the close of business on the day
         such Shares are sold, constituting Qualified Holdings, sold by the
         Recipient during that quarter and owned beneficially or of record by
         the Recipient or by its Customers, plus (B) service fee payments at a
         rate not to exceed 0.25% on an annual basis of the average during the
         calendar quarter of the aggregate net asset value of Shares, computed
         as of the close of each business day, constituting Qualified Holdings
         owned beneficially or of record by the Recipient or by its Customers
         for a period of more than one (1) year. At the Distributor's sole
         option, Advance Service Fee Payments may be made more often than
         quarterly, and sooner than the end of the calendar quarter. In the
         event Shares are redeemed less than one year after the date such Shares
         were sold, the Recipient is obligated to and will repay the Distributor
         on demand a pro rata portion of such Advance Service Fee Payments,
         based on the ratio of the time such Shares were held to one (1) year.

                  A majority of the Independent Trustees may at any time or from
         time to time increase or decrease and thereafter adjust the rate of
         fees to be paid to the Distributor or to any Recipient, but not to
         exceed the rate set forth above, and/or increase or decrease the number
         of shares constituting Minimum Qualified Holdings. The Distributor
         shall notify all Recipients of the Minimum Qualified Holdings and the
         rate of payments hereunder applicable to Recipients, and shall provide
         each Recipient with written notice within thirty (30) days after any
         change in these provisions. Inclusion of such provisions or a change in
         such provisions in a revised current prospectus shall constitute
         sufficient notice.

         (c) Under the Plan, payments may be made to Recipients: (i) by
         OppenheimerFunds, Inc. ("OFI") from its own resources (which may
         include profits derived from the advisory fee it receives from the
         Fund), or (ii) by the Distributor (a subsidiary of OFI), from its own
         resources.

4. Selection and Nomination of Trustees. While this Plan is in effect, the
selection or replacement of Independent Trustees and the nomination of those
persons to be Trustees of the Fund who are not "interested persons" of the Fund
shall be committed to the discretion of the Independent Trustees. Nothing herein
shall prevent the Independent Trustees from soliciting the views or the
involvement of others in such selection or nomination if the final decision on
any such selection and nomination is approved by a majority of the incumbent
Independent Trustees.

5. Reports. While this Plan is in effect, the Treasurer of the Fund shall
provide at least quarterly a written report to the Fund's Board for its review,
detailing the aggregate amount of payments made pursuant to this Plan and the
purposes for which the payments were made. The report shall state whether all
provisions of Section 3 of this Plan have been complied with. The Distributor
shall annually certify to the Board the amount of its total expenses incurred
that year with respect to the personal service and maintenance of Accounts in
conjunction with the Board's annual review of the continuation of the Plan.

6. Related Agreements. Any agreement related to this Plan shall be in writing
and shall provide that: (i) such agreement may be terminated at any time,
without payment of any penalty, by vote of a majority of the Independent
Trustees or by a vote of the holders of a "majority" (as defined in the 1940
Act) of the Fund's outstanding voting securities of the Class, on not more than
sixty days written notice to any other party to the agreement; (ii) such
agreement shall automatically terminate in the event of its "assignment" (as
defined in the 1940 Act); (iii) it shall go into effect when approved by a vote
of the Board and its Independent Trustees cast in person at a meeting called for
the purpose of voting on such agreement; and (iv) it shall, unless terminated as
herein provided, continue in effect from year to year only so long as such
continuance is specifically approved at least annually by the Board and its
Independent Trustees cast in person at a meeting called for the purpose of
voting on such continuance.

7. Effectiveness, Continuation, Termination and Amendment. This Plan has been
approved by a vote of the Independent Trustees cast in person at a meeting
called on April 19, 2006 for the purpose of voting on this Plan. Unless
terminated as hereinafter provided, it shall continue in effect until renewed by
the Board in accordance with the Rule and thereafter from year to year
thereafter or as the Board may otherwise determine only so long as such
continuance is specifically approved at least annually by the Board and its
Independent Trustees by a vote cast in person at a meeting called for the
purpose of voting on such continuance. This Plan may be terminated at any time
by vote of a majority of the Independent Trustees or by the vote of the holders
of a "majority" (as defined in the 1940 Act) of the Fund's outstanding voting
securities of Class P. This Plan may not be amended to increase materially the
amount of payments to be made without approval of the Class P Shareholders, in
the manner described above, and all material amendments must be approved by a
vote of the Board and of the Independent Trustees.

8. Disclaimer of Shareholder and Trustee Liability. The Distributor understands
that the obligations of the Fund under this Plan are not binding upon any
Trustee or shareholder of the Fund personally, but bind only the Fund and the
Fund's property. The Distributor represents that it has notice of the provisions
of the Declaration of Trust of the Fund disclaiming shareholder and Trustee
liability for acts or obligations of the Fund.

                                            Oppenheimer Institutional Money Market Fund



                            By: /s/Robert G. Zack
                                _____________________
                                   Robert G. Zack, Secretary


                                            OppenheimerFunds Distributor, Inc.



                            By: /s/Richard Knott
                                _____________________
                                 Richard Knott
                                 Senior Vice President