SEI LIQUID ASSET TRUST
497, 1997-11-04
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<PAGE>
PROSPECTUS
 
OCTOBER 30, 1997
 
- --------------------------------------------------------------------------------
 
TREASURY SECURITIES PORTFOLIO
 
- --------------------------------------------------------------------------------
 
Please read this prospectus carefully before investing, and keep it on file for
future reference. It contains information that can help you decide if the
Portfolio's investment goals match your own.
 
A Statement of Additional Information dated October 30, 1997, has been filed
with the Securities and Exchange Commission and is available upon request and
without charge by writing the Distributor, SEI Investments Distribution Co.,
Oaks, Pennsylvania 19456, or by calling 1-800-437-6016. The Statement of
Additional Information is incorporated by reference into this Prospectus.
 
SEI Liquid Asset Trust (the "Trust") is an open-end management investment
company, certain classes of which offer shareholders a convenient means of
investing their funds in one or more professionally managed diversified
portfolios of securities. The Treasury Securities Portfolio offers two classes
of shares, Class A shares and Class D shares. Class D shares differ from Class A
shares primarily in the allocation of certain distribution expenses and transfer
agent fees. Class D shares are available through SEI Investments Distribution
Co. (the Trust's distributor), and through participating broker-dealers,
financial institutions and other organizations. This Prospectus offers Class D
shares of the Trust's Treasury Securities Portfolio (the "Portfolio").
 
AN INVESTMENT IN THE PORTFOLIO IS NEITHER INSURED NOR GUARANTEED BY THE U.S.
GOVERNMENT, AND THERE CAN BE NO ASSURANCE THAT THE PORTFOLIO WILL BE ABLE TO
MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.
 
- --------------------------------------------------------------------------------
 
 THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION, NOR HAS THE SECURITIES AND EXCHANGE COMMISSION PASSED
 UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
 CONTRARY IS A CRIMINAL OFFENSE.
 
 THE TRUST'S SHARES ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR
 ENDORSED BY, ANY BANK. THE SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL
 DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD OR ANY OTHER
 GOVERNMENT AGENCY. INVESTMENT IN THE SHARES INVOLVES RISK, INCLUDING POSSIBLE
 LOSS OF THE PRINCIPAL AMOUNT INVESTED.
<PAGE>
HOW TO READ THIS PROSPECTUS
- --------------------------------------------------------------------------------
 
This Prospectus provides information that you should know about the Portfolio
before investing. Brief descriptions are also provided throughout the Prospectus
to better explain certain key points. To find these helpful guides, look for
this symbol.[>]
 
FUND HIGHLIGHTS
- --------------------------------------------------------------------------------
 
The following summary provides basic information about the Class D shares of the
Trust's Treasury Securities Portfolio. This summary is qualified in its entirety
by reference to the more detailed information provided elsewhere in this
Prospectus and in the Statement of Additional Information.
 
INVESTMENT OBJECTIVE
AND POLICIES
                     The Treasury Securities Portfolio seeks to preserve
                     principal value and maintain a high degree of liquidity
                     while providing current income. See "Investment Objective
                     and Policies" and "Description of Permitted Investments and
                     Risk Factors."
 
UNDERSTANDING RISK
                     There can be no assurance that
                     the Portfolio will achieve its
                     investment objective. See
                     "Investment Objective and
                     Policies" and "Description of
                     Permitted Investments and Risk
                     Factors."
 
MANAGEMENT PROFILE
                     Wellington Management Company,
                     LLP (the "Adviser") serves as
                     the investment adviser to the
                     Portfolio. The Adviser is a
                     professional investment
                     counseling firm that has been
                     providing investment advisory
                     services to mutual funds since
                     1933. SEI Fund Management serves
                     as the manager and shareholder
                     servicing agent of the Trust
                     (the "Manager"). DST Systems,
                     Inc. ("DST") serves as transfer
                     agent (the "Transfer Agent") and
                     dividend disbursing agent for
                     the Class D shares of the Trust.
                     SEI Investments Distribution Co.
                     serves as distributor (the
                     "Distributor") of the Trust's
                     shares. See "The Manager", "The
                     Adviser" and "Distribution."
 ...........................................................................
 
<TABLE>
<S>                                                 <C>
FUND HIGHLIGHTS...................................     2
TABLE OF CONTENTS
PORTFOLIO EXPENSES................................     4
FINANCIAL HIGHLIGHTS..............................     5
YOUR ACCOUNT AND DOING BUSINESS WITH US...........     6
INVESTMENT OBJECTIVE AND POLICIES.................     9
GENERAL INVESTMENT POLICIES.......................     9
INVESTMENT LIMITATIONS............................     9
THE MANAGER.......................................    10
THE ADVISER.......................................    11
DISTRIBUTION......................................    11
PERFORMANCE.......................................    12
TAXES.............................................    13
ADDITIONAL INFORMATION ABOUT DOING BUSINESS WITH
     US...........................................    15
GENERAL INFORMATION...............................    17
DESCRIPTION OF PERMITTED INVESTMENTS AND RISK
     FACTORS......................................    19
</TABLE>
 
 ...........................................................................
 
                                                                               2
<PAGE>
YOUR ACCOUNT AND
DOING BUSINESS WITH
US
                     You may open an account with just $1,000, and make
                     additional investments with as little as $100. Redemptions
                     of the Portfolio's shares are made at net asset value per
                     share. See "Purchase of Shares" and "Redemption of Shares."
 
DIVIDENDS
                     Substantially all of the net
                     investment income (exclusive of
                     capital gains) of the Portfolio
                     is distributed in the form of
                     dividends that will be declared
                     daily and paid monthly on the
                     first Business Day of each
                     month. Any realized net capital
                     gain is distributed at least
                     annually. Distributions are paid
                     in additional shares unless you
                     elect to take the payment in
                     cash. See "Dividends."
 
INFORMATION/SERVICE
CONTACTS
                     For more information about Class
                     D shares, call SEI Financial
                     Services Company at
                     1-800-437-6016.
 ...........................................................................
[>] INVESTMENT PHILOSOPHY
BELIEVING THAT NO SINGLE INVESTMENT ADVISER CAN DELIVER OUTSTANDING PERFORMANCE
IN EVERY INVESTMENT CATEGORY, ONLY THOSE ADVISERS WHO HAVE DISTINGUISHED
THEMSELVES WITHIN THEIR AREAS OF SPECIALIZATION ARE SELECTED TO ADVISE OUR
MUTUAL FUNDS.
 ...........................................................................
 
                                                                               3
<PAGE>
PORTFOLIO EXPENSES
- --------------------------------------------------------------------------------
 
The purpose of the following table is to help you understand the various costs
and expenses that you, as a shareholder, will bear directly or indirectly in
connection with an investment in Class D shares.
 
SHAREHOLDER TRANSACTION EXPENSES (AS A PERCENTAGE OF OFFERING PRICE)
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                               TREASURY
                                                              SECURITIES
                                                              PORTFOLIO
                                                              ----------
<S>                                                           <C>
Maximum Sales Charge Imposed on Purchases                        None
Maximum Sales Charge Imposed on Reinvested Dividends             None
Redemption Fees (1)                                              None
</TABLE>
 
ANNUAL OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                           <C>
Management/Advisory Fees (AFTER FEE WAIVER) (2)                  .41%
12b-1 Fees (AFTER FEE WAIVERS) (3)                               .20%
Other Expenses                                                   .18%
- ------------------------------------------------------------------------
Total Operating Expenses (AFTER FEE WAIVERS) (2)(3)(4)           .79%
- ------------------------------------------------------------------------
</TABLE>
 
(1) A CHARGE, CURRENTLY $10.00, IS IMPOSED ON WIRES OF REDEMPTION PROCEEDS OF
    THE PORTFOLIO'S CLASS D SHARES.
 
(2) THE MANAGER HAS AGREED TO WAIVE ITS FEE IN AN AMOUNT NECESSARY TO LIMIT THE
    TOTAL OPERATING EXPENSES FOR CLASS D SHARES, AND THE TOTAL OPERATING
    EXPENSES SHOWN REFLECT THIS WAIVER. ABSENT WAIVERS, MANAGEMENT/ADVISORY FEES
    WOULD HAVE BEEN .45%.
 
(3) THE DISTRIBUTOR HAS WAIVED, ON A VOLUNTARY BASIS, A PORTION OF ITS 12b-1
    FEE, AND THE 12b-1 FEES SHOWN REFLECT THIS WAIVER. THE DISTRIBUTOR RESERVES
    ITS RIGHT TO TERMINATE THIS WAIVER AT ANY TIME IN ITS SOLE DISCRETION.
    ABSENT SUCH WAIVER, 12b-1 FEES WOULD BE .25% FOR THE PORTFOLIO.
 
(4) ABSENT WAIVERS, TOTAL OPERATING EXPENSES OF THE CLASS D SHARES OF THE
    PORTFOLIO WOULD BE .88%. ADDITIONAL INFORMATION MAY BE FOUND UNDER THE
    MANAGER, THE ADVISER AND DISTRIBUTION.
 
EXAMPLE
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                       3      5     10
                                                              1 YR.  YRS.   YRS.   YRS.
                                                              -----  -----  -----  -----
<S>                                                           <C>    <C>    <C>    <C>
An investor in the Class D shares of the Portfolio would pay
  the following expenses on a $1,000 investment assuming (1)
  a 5% annual return and (2) redemption at the end of each
  time period:
    Treasury Securities Portfolio                             $  8   $ 25   $ 44   $ 98
- ----------------------------------------------------------------------------------------
</TABLE>
 
THE EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF FUTURE EXPENSES. ACTUAL
EXPENSES MAY BE GREATER OR LESS THAN THOSE SHOWN.
 
THE INFORMATION SET FORTH IN THE FOREGOING TABLE AND EXAMPLE RELATES ONLY TO THE
CLASS D SHARES. THE PORTFOLIO ALSO OFFERS CLASS A SHARES, WHICH ARE SUBJECT TO
THE SAME EXPENSES, EXCEPT THERE ARE NO TRANSFER AGENT COSTS, AND THERE ARE
SHAREHOLDER SERVICING COSTS. A PERSON WHO PURCHASES SHARES THROUGH AN ACCOUNT
WITH A FINANCIAL INSTITUTION MAY BE CHARGED SEPARATE FEES BY THAT INSTITUTION.
ADDITIONAL INFORMATION MAY BE FOUND UNDER "THE MANAGER," "THE ADVISER" AND
"DISTRIBUTION." LONG-TERM SHAREHOLDERS MAY PAY MORE THAN THE ECONOMIC EQUIVALENT
OF THE MAXIMUM FRONT-END SALES CHARGE OTHERWISE PERMITTED BY THE CONDUCT RULES
OF THE NATIONAL ASSOCIATION OF SECURITIES DEALERS, INC. (THE "NASD").
 
                                                                               4
<PAGE>
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
 
The following financial highlights for a share outstanding throughout each
period have been audited by Price Waterhouse LLP, the Trust's independent
accountants, whose report on the financial statements including this
information, dated August 7, 1997, was unqualified. This information should be
read in conjunction with the Trust's financial statements as of and for the
fiscal year ended June 30, 1997, and notes thereto, which are incorporated by
reference to the Trust's Statement of Additional Information. Additional
performance information is set forth in the Trust's 1997 Annual Report to
Shareholders, which is available upon request and without charge by calling
1-800-437-6016.
 
FOR A CLASS D SHARE OUTSTANDING THROUGHOUT THE PERIOD
<TABLE>
<CAPTION>
                    NET ASSET                                    DISTRIBUTIONS
                      VALUE         NET         REALIZED AND      FROM NET    DISTRIBUTIONS   NET ASSET               NET ASSETS
                    BEGINNING   INVESTMENT    UNREALIZED GAINS   INVESTMENT   FROM REALIZED   VALUE END    TOTAL        END OF
                    OF PERIOD     INCOME       ON SECURITIES       INCOME     CAPITAL GAINS   OF PERIOD    RETURN    PERIOD (000)
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                 <C>         <C>           <C>                <C>          <C>             <C>         <C>        <C>
- ------------------
TREASURY
SECURITIES
- ------------------
  1997               $ 1.00       $ 0.05           $   --          $(0.05)       $   --        $ 1.00        4.73%     $    216
  1996                 1.00         0.05               --           (0.05)           --          1.00        5.01           219
  1995                 1.00         0.05               --           (0.05)           --          1.00        4.69         9.798
  1994 (1)             1.00         0.01               --           (0.01)           --          1.00        0.50**          23
 
<CAPTION>
                                                           RATIO OF NET
                                  RATIO OF     RATIO OF     INVESTMENT
                                    NET       EXPENSE TO    INCOME TO
                     RATIO OF    INVESTMENT    AVERAGE     AVERAGE NET
                     EXPENSES    INCOME TO    NET ASSETS      ASSETS
                    TO AVERAGE    AVERAGE     (EXCLUDING    (EXCLUDING
                    NET ASSETS   NET ASSETS    WAIVERS)      WAIVERS)
- ------------------
<S>                 <C>          <C>          <C>          <C>
- ------------------
TREASURY
SECURITIES
- ------------------
  1997                 0.79%         4.64%       1.09%         4.34%
  1996                 0.79          4.92        0.87          4.84
  1995                 0.79          5.15        0.89          5.05
  1994 (1)             0.79*         3.23*       0.98*         3.04*
</TABLE>
 
 (1) TREASURY SECURITIES CLASS D COMMENCED OPERATIONS ON MAY 4, 1994.
 
  * ANNUALIZED
 
 ** NOT ANNUALIZED
 
   AMOUNTS DESIGNATED AS "--" ARE EITHER $0 OR HAVE BEEN ROUNDED TO $0.
 
                                                                               5
<PAGE>
YOUR ACCOUNT AND DOING BUSINESS WITH US
- --------------------------------------------------------------------------------
 
Class D shares of the Portfolio are sold on a continuous basis and may be
purchased directly from the Trust's Distributor, SEI Investments Distribution
Co. Shares may also be purchased through financial institutions, broker-dealers,
or other organizations which have established a dealer agreement or other
arrangement with the Distributor ("Intermediaries"). For more information about
the following topics, see "Additional Information About Doing Business with Us."
- --------------------------------------------------------------------------------
HOW TO BUY, SELL AND
EXCHANGE SHARES
THROUGH
INTERMEDIARIES
                     Class D shares of the Portfolio may be purchased through
                     Intermediaries. Contact your Intermediary for information
                     on how to buy, sell and exchange shares. To allow for
                     processing and transmittal of orders to the Transfer Agent
                     (or its authorized agent) on the
                     same day, Intermediaries may
                     impose earlier cut-off times for
                     receipt of purchase orders.
                     Certain Intermediaries may
                     charge customer account fees.
                     Information concerning any
                     charges will be provided to the
                     customer by the Intermediary.
 
                           The shares you purchase
                     through an Intermediary may be
                     held "of record" by that
                     Intermediary. If you want to
                     transfer the registration of
                     shares beneficially owned by
                     you, but held "of record" by an
                     Intermediary, you should call
                     the Intermediary to request this change.
 ...........................................................................
[>] WHAT IS AN INTERMEDIARY?
ANY ENTITY, SUCH AS A BANK, BROKER-DEALER, OTHER FINANCIAL INSTITUTION,
ASSOCIATION OR ORGANIZATION WHICH HAS ENTERED INTO AN ARRANGEMENT WITH THE
DISTRIBUTOR TO SELL CLASS D SHARES TO ITS CUSTOMERS.
 ...........................................................................
 
HOW TO BUY SHARES
FROM THE DISTRIBUTOR
                     Application forms can be obtained by calling
                     1-800-437-6016.
OPENING AN ACCOUNT BY
CHECK
                     You may buy Class D shares by mailing a completed
                     application and a check (or other negotiable bank
                     instrument or money order) payable to "Class D (Treasury
                     Securities Portfolio)". If you send a check that does not
                     clear, the purchase will be canceled and you could be
                     liable for any losses or fees incurred. Third-party checks,
                     credit cards, credit card checks and cash will not be
                     accepted. When purchases are made by check (including
                     certified or cashier's checks), redemption proceeds will
                     not be forwarded until the check providing for the
                     investment being redeemed has cleared (which may take up to
                     15 days).
BY FED WIRE
                     To buy shares by Fed Wire, call the Transfer Agent
                     toll-free at 1-800-437-6016.
AUTOMATIC INVESTMENT
PLAN ("AIP")
                     You may systematically buy Class D shares through
                     deductions from your checking or savings account, provided
                     these accounts are maintained through banks which are part
                     of the Automated Clearing House ("ACH") system. You may
                     purchase shares on a fixed schedule (semi-monthly or
                     monthly) with amounts as low as $25, or as high as
                     $100,000. Upon notice, the amount you commit to the AIP may
                     be changed or canceled at any time. The AIP is subject to
                     account minimum initial purchase amounts and minimum
                     balance maintenance requirements.
 
                                                                               6
<PAGE>
EXCHANGING SHARES
WHEN CAN YOU
EXCHANGE SHARES?
                     Once payment for your shares has been received and accepted
                     (I.E., an account has been established), you may exchange
                     some or all of your shares for Class D shares of SEI
                     International Trust, SEI Tax Exempt Trust and SEI
                     Institutional Managed Trust ("SEI Funds"). Exchanges are
                     made at net asset value plus any applicable sales charge.
WHEN DO SALES CHARGES
APPLY TO AN EXCHANGE?
                     SEI Funds' portfolios that are
                     not money market portfolios
                     currently impose a sales charge
                     on Class D shares. If you
                     exchange into one of these
                     non-money market portfolios, you
                     will have to pay a sales charge
                     on any portion of your exchanged
                     Class D shares for which you
                     have not previously paid a sales
                     charge.
 
                           If you previously paid a
                     sales charge on your Class D
                     shares, no additional sales
                     charge will be assessed when you
                     exchange those Class D shares
                     for other Class D shares.
 
                           If you buy Class D shares
                     of a "non-money market" fund and
                     you receive a sales charge
                     waiver, you will be deemed to
                     have paid the sales charge for purposes of this exchange
                     privilege. In calculating any sales charge payable on your
                     exchange, the Trust will assume that the first shares you
                     exchange are those on which you have already paid a sales
                     charge. Sales charge waivers may also be available under
                     certain circumstances described in the SEI Funds'
                     prospectuses.
 ...........................................................................
[>] HOW DOES AN EXCHANGE TAKE PLACE?
WHEN MAKING AN EXCHANGE, YOU AUTHORIZE THE SALE OF YOUR SHARES OF ONE OR MORE
PORTFOLIOS IN ORDER TO PURCHASE THE SHARES OF ANOTHER PORTFOLIO. IN OTHER WORDS,
YOU ARE EXECUTING A SELL ORDER AND THEN A BUY ORDER. THIS SALE OF YOUR SHARES IS
A TAXABLE EVENT WHICH COULD RESULT IN A TAXABLE GAIN OR LOSS.
 ...........................................................................
 
                           The Trust reserves the right to change the terms and
                     conditions of the exchange privilege discussed herein, or
                     to terminate the exchange privilege, upon 60 days' notice.
                     The Trust also reserves the right to deny an exchange
                     request made within 60 days of the purchase of a "non-money
                     market" portfolio.
REQUESTING AN EXCHANGE
OF SHARES
                     To request an exchange, you must provide proper
                     instructions in writing to the Transfer Agent. Telephone
                     exchanges will also be accepted if you previously elected
                     this option on your account application.
 
                           In the case of shares held "of record" by an
                     Intermediary but beneficially owned by you, you should
                     contact the Intermediary who will contact the Transfer
                     Agent and effect the exchange on your behalf.
 
HOW TO SELL SHARES
THROUGH THE
DISTRIBUTOR
                     To sell your shares, a written request for redemption in
                     good order must be received by the Transfer Agent (or its
                     authorized agent). Valid written redemption requests will
                     be effective on receipt. All shareholders of record must
                     sign the redemption request. The Transfer Agent may require
                     that the signatures on written requests be guaranteed.
BY MAIL
                     For information about the proper form of redemption
                     requests, call 1-800-437-6016. You may also have the
                     proceeds mailed to an address of record or mailed (or sent
                     by ACH) to a commercial bank account previously designated
                     on the Account Application or specified
 
                                                                               7
<PAGE>
                     by written instruction to the Transfer Agent. There is no
                     charge for having redemption requests mailed to a
                     designated bank account.
BY TELEPHONE
                     You may sell your shares by
                     telephone if you previously
                     elected that option on the
                     Account Application. You may
                     have the proceeds mailed to the
                     address of record, wired or sent
                     by ACH to a commercial bank
                     account previously designated on
                     the Account Application. Under
                     most circumstances, payments
                     will be transmitted on the next
                     Business Day following receipt
                     of a valid telephone request for
                     redemption. Wire redemption
                     requests may be made by calling
                     1-800-437-6016. A wire
                     redemption charge (presently
                     $10.00) will be deducted from
                     the amount of the redemption.
 ...........................................................................
[>] WHAT IS A SIGNATURE GUARANTEE?
A SIGNATURE GUARANTEE VERIFIES THE AUTHENTICITY OF YOUR SIGNATURE AND MAY BE
OBTAINED FROM ANY OF THE FOLLOWING: BANKS, BROKERS, DEALERS, CERTAIN CREDIT
UNIONS, SECURITIES EXCHANGE OR ASSOCIATION, CLEARING AGENCY OR SAVINGS
ASSOCIATION. A NOTARY PUBLIC CANNOT PROVIDE A SIGNATURE GUARANTEE.
 ...........................................................................
SYSTEMATIC WITHDRAWAL
PLAN ("SWP")
                     You may establish a systematic withdrawal plan for an
                     account with a $10,000 minimum balance. Under the plan,
                     redemptions can be automatically processed from accounts
                     (monthly, quarterly, semi-annually or annually) by check or
                     by ACH with a minimum redemption amount of $50.
CHECK-WRITING
                     Check-Writing Service is offered free of charge to Class D
                     shareholders of the Portfolio. You may redeem shares by
                     writing checks on your account for $500 or more. Once you
                     have signed and returned a signature card, you will receive
                     a supply of checks. A check may be made payable to any
                     person, and your account will continue to earn dividends
                     until the check clears.
 
                           Because of the difficulty of determining in advance
                     the exact value of your account, you may not use a check to
                     close your account. The checks are free, but your account
                     will be charged a fee for stopping payment of a check upon
                     your request or if the check cannot be honored because of
                     insufficient funds or other valid reasons.
 
                                                                               8
<PAGE>
INVESTMENT OBJECTIVE
AND POLICIES
     ___________________________________________________________________________
TREASURY SECURITIES
PORTFOLIO
                     The investment objective of the
                     Treasury Securities Portfolio is
                     to preserve principal value and
                     maintain a high degree of
                     liquidity while providing
                     current income.
 
                           The Treasury Securities
                     Portfolio invests exclusively in
                     U.S. Treasury obligations and
                     repurchase agreements involving
                     such obligations. The repurchase
                     agreement dealers selected for
                     the Portfolio must meet certain
                     creditworthiness criteria
                     established by Standard & Poor's
                     Corporation ("S&P").
 
                           There can be no assurance
                     that the Portfolio will achieve
                     its investment objective.
 ...........................................................................
[>] WHAT ARE INVESTMENT OBJECTIVES AND POLICIES?
A PORTFOLIO'S INVESTMENT OBJECTIVE IS A STATEMENT OF WHAT IT SEEKS TO ACHIEVE.
IT IS IMPORTANT TO MAKE SURE THAT THE INVESTMENT OBJECTIVE MATCHES YOUR OWN
FINANCIAL NEEDS AND CIRCUMSTANCES. THE INVESTMENT POLICIES SECTION SPELLS OUT
THE TYPES OF SECURITIES IN WHICH THE PORTFOLIO INVESTS.
 ...........................................................................
 
GENERAL INVESTMENT
POLICIES
     ___________________________________________________________________________
 
                     In purchasing obligations, the Portfolio complies with the
                     requirements of Rule 2a-7 under the 1940 Act, as that Rule
                     may be amended from time to time. These requirements
                     currently provide that the Portfolio must limit its
                     investments to securities with remaining maturities of 397
                     days or less, and must maintain a dollar-weighted average
                     maturity of 90 days or less.
 
                           The Portfolio may invest up to 10% of its net assets
                     in illiquid securities.
 
                           For additional information regarding the Portfolio's
                     permitted investments, see "Description of Permitted
                     Investments and Risk Factors" and the Statement of
                     Additional Information.
 
INVESTMENT
LIMITATIONS
        ________________________________________________________________________
 
                     The investment objective and certain of the investment
                     limitations are fundamental policies of the Portfolio.
                     Fundamental policies cannot be changed with respect to the
                     Portfolio without the consent of the holders of a majority
                     of the Portfolio's outstanding shares. It is a fundamental
                     policy of the Portfolio to use its best efforts to maintain
                     a constant net asset value of $1.00 per share.
 
                                                                               9
<PAGE>
                     THE PORTFOLIO MAY NOT:
 
                     1. Purchase securities of any issuer (except securities
                        issued or guaranteed by the U.S. Government, its
                        agencies or instrumentalities and any securities
                        guaranteed thereby) if as a result more than 5% of total
                        assets of the Portfolio (based on fair market value at
                        the time of investment) would be invested in the
                        securities of such issuer; provided, however, that the
                        Portfolio may temporarily invest up to 25% of its total
                        assets without regard to this restriction as permitted
                        by Rule 2a-7.
 
                     2. Purchase any securities which would cause more than 25%
                        of the total assets of the Portfolio based on fair
                        market value at the time of such purchase, to be
                        invested in the securities of one or more issuers
                        conducting their principal business activities in the
                        same industry, provided that this limitation does not
                        apply to investments in (a) domestic banks and (b)
                        obligations issued or guaranteed by the U.S. Government
                        or its agencies and instrumentalities.
 
                     3. Borrow money except for temporary or emergency purposes
                        and then only in an amount not exceeding 10% of the
                        value of the total assets of the Portfolio. This
                        borrowing provision is included solely to facilitate the
                        orderly sale of portfolio securities to accommodate
                        substantial redemption requests if they should occur and
                        is not for investment purposes. All borrowings will be
                        repaid before making additional investments for the
                        Portfolio and any interest paid on such borrowings will
                        reduce the income of the Portfolio.
 
                     The foregoing percentage limitations will apply at the time
                     of the purchase of a security. Additional investment
                     limitations are set forth in the Statement of Additional
                     Information.
THE MANAGER
          ______________________________________________________________________
 
                     SEI Fund Management ("SEI Management"), provides the Trust
                     with overall management services, regulatory reporting, all
                     necessary office space, equipment, personnel and facilities
                     and for acting as shareholder servicing agent.
 
                           For its management services, SEI Management is
                     entitled to a fee, which is calculated daily and paid
                     monthly, at an annual rate of .42% of the average daily net
                     assets of the Treasury Securities Portfolio. SEI Management
                     has contractually agreed to waive a portion of its fee in
                     order to limit total operating expenses on an annualized
                     basis to not more than .84% of the average daily net assets
                     of the Class D shares of the Portfolio on an annualized
                     basis. For the fiscal year ended June 30, 1997, the
                     Portfolio paid management fees, after fee waivers, of .37%
                     of the Portfolio's average daily net assets.
 
                           The Trust and DST Systems, Inc., 1004 Baltimore
                     Avenue, Kansas City, Missouri, 64105, have entered into a
                     separate transfer agent agreement with respect to the Class
                     D shares of the Portfolio. Under this agreement, DST acts
                     as the transfer agent and dividend disbursing agent (the
                     "Transfer Agent") for the Class D shares of the Trust.
 
                                                                              10
<PAGE>
THE ADVISER
         _______________________________________________________________________
 
                     Wellington Management Company, LLP (the "Adviser") 75 State
                     Street, Boston, Massachusetts 02109, serves as the
                     investment adviser to the Portfolio. The Adviser, under
                     an investment advisory agreement
                     with the Trust, invests the
                     assets of the Portfolio and
                     continuously reviews, supervises
                     and administers the Portfolio's
                     investment program, subject to
                     the supervision of, and policies
                     set by, the Trustees of the
                     Trust.
 
                           As of September 30, 1997,
                     the Adviser had investment
                     management authority with
                     respect to approximately $168.7
                     billion of assets, including the
                     assets of the Trust and SEI
                     Daily Income Trust, which is an
                     open-end money market investment
                     company administered by the
                     Manager. The Adviser is a
                     professional investment
                     counseling firm which provides investment services to
                     investment companies, employee benefit plans, endowments,
                     foundations, and other institutions and individuals. The
                     Adviser's predecessor organizations have provided
                     investment advisory services to investment companies since
                     1933, and to investment counseling clients since 1960. The
                     Adviser is a Massachusetts limited liability partnership,
                     of which the following persons are managing partners:
                     Robert W. Doran, Duncan M. McFarland and John R. Ryan.
 ...........................................................................
[>] INVESTMENT
ADVISER
A PORTFOLIO'S INVESTMENT ADVISER MANAGES THE INVESTMENT ACTIVITIES AND IS
RESPONSIBLE FOR THE PERFORMANCE OF THE PORTFOLIO. THE ADVISER CONDUCTS
INVESTMENT RESEARCH, EXECUTES INVESTMENT STRATEGIES BASED ON AN ASSESSMENT OF
ECONOMIC AND MARKET CONDITIONS, AND DETERMINES WHICH SECURITIES TO BUY, HOLD OR
SELL.
 ...........................................................................
 
                           The Adviser is entitled to a fee, which is calculated
                     daily and paid monthly, at an annual rate of .075% of the
                     combined average daily net assets of the Trust's Portfolios
                     up to $500 million, and .02% of such assets in excess of
                     $500 million. Such fees are allocated daily among the
                     Portfolios of the Trust on the basis of their relative net
                     assets. For the fiscal year ended June 30, 1997, the
                     Treasury Securities Portfolio paid advisory
                     fees, after fee waivers, of .04% of its relative net
                     assets.
DISTRIBUTION
         _______________________________________________________________________
 
                     SEI Investments Distribution Co. (the "Distributor"), a
                     wholly-owned subsidiary of SEI Investments Company, serves
                     as each Portfolio's distributor pursuant to a distribution
                     agreement (the "Distribution Agreement") with the Trust.
                     The Portfolio has adopted a distribution plan for its Class
                     D shares (the "Class D Plan") pursuant to Rule 12b-1 under
                     the Investment Company Act of 1940, as amended (the "1940
                     Act"). The Portfolio has adopted a shareholder servicing
                     plan for its Class A shares (the "Class A Plan").
 
                           The Class D Plan provides for payments to the
                     Distributor at an annual rate of .25% of the Portfolio's
                     average daily net assets attributable to Class D Shares.
                     This payment may be used to compensate financial
                     institutions that provide distribution-related services to
                     their customers. These payments are characterized as
                     "compensation," and are not directly tied to expenses
                     incurred by the Distributor; the payments the Distributor
 
                                                                              11
<PAGE>
                     receives during any year may therefore be higher or lower
                     than its actual expenses. These payments compensate the
                     Distributor for its services in connection with
                     distribution assistance or the provision of shareholder
                     services, and some or all of it may be used to pay
                     financial institutions and intermediaries such as banks,
                     savings and loan associations, insurance companies, and
                     investment counselors, broker-dealers (including the
                     Distributor's affiliates and subsidiaries) for services or
                     reimbursement of expenses incurred in connection with
                     distribution assistance or the provision of shareholder
                     services. If the Distributor's expenses are less than its
                     fees under the Class D Plan, the Trust will still pay the
                     full fee and the Distributor will realize a profit, but the
                     Trust will not be obligated to pay in excess of the full
                     fee, even if the Distributor's actual expenses are higher.
                     Currently, the Distributor is taking this compensation
                     payment under the Class D Plan at a rate of .20% of the
                     Portfolio's average daily net assets, on an annualized
                     basis, attributable to Class D shares.
 
                           It is possible that an institution may offer
                     different classes of shares to its customers and thus
                     receive different compensation with respect to different
                     classes. These financial institutions may also charge
                     separate fees to their customers.
 
                           The Trust may execute brokerage or other agency
                     transactions through the Distributor for which the
                     Distributor may receive compensation.
 
                           The Distributor may, from time to time and at its own
                     expense, provide promotional incentives, in the form of
                     cash or other compensation, to certain financial
                     institutions whose representatives have sold or are
                     expected to sell significant amounts of the Portfolio's
                     shares.
PERFORMANCE
          ______________________________________________________________________
 
                     From time to time, the Portfolio may advertise "current
                     yield" and "effective compound yield." These figures will
                     fluctuate, as they are based on historical earnings and are
                     not intended to indicate future performance. The "current
                     yield" of the Portfolio refers to the income generated by
                     an investment over a seven-day period which is then
                     "annualized." That is, the amount of income generated by an
                     investment during that week is assumed to be generated each
                     week over a 52-week period and is shown as a percentage of
                     the investment. The "effective yield" is calculated
                     similarly but, when annualized, the income earned by an
                     investment is assumed to be reinvested. The "effective
                     yield" will be slightly higher than the "current yield"
                     because of the compounding effect of this assumed
                     reinvestment.
 
                           The Portfolio may periodically compare its
                     performance to that of: (i) other mutual funds tracked by
                     mutual fund rating services (such as Lipper Analytical),
                     financial and business publications and periodicals; (ii)
                     broad groups of comparable mutual funds; (iii) unmanaged
                     indices which may assume investment of dividends but
                     generally do not reflect deductions for administrative and
                     management costs; or (iv) other investment alternatives.
 
                                                                              12
<PAGE>
                           For the Portfolio, the performance of the Class A
                     shares will normally be higher than the performance of the
                     Class D shares of the Portfolio because of additional
                     distribution and transfer agent expenses charged to Class D
                     shares.
TAXES
  ______________________________________________________________________________
 
                     The following summary of federal income tax consequences is
                     based on current tax laws and regulations, which may be
                     changed by legislative, judicial or administrative action.
                     No attempt has been made to present a detailed explanation
                     of the federal, state, or local income tax treatment of the
                     Portfolio or its shareholders. In addition, state and local
                     tax consequences of an investment in the Portfolio may
                     differ from the federal income tax consequences described
                     below. Accordingly, Shareholders are urged to consult their
                     tax advisers regarding specific
                     questions as to federal, state
                     and local income taxes.
                     Additional information
                     concerning taxes is set forth in
                     the Statement of Additional
                     Information.
TAX STATUS OF THE
PORTFOLIO
                     The Portfolio is treated as a
                     separate entity for federal tax
                     purposes and is not combined
                     with the Trust's other
                     Portfolios. The Portfolio
                     intends to continue to qualify
                     for the special tax treatment afforded regulated investment
                     companies under subchapter M of the Internal Revenue Code
                     of 1986, as amended, so as to be relieved of federal income
                     tax on net investment company taxable income and net
                     capital gains (the excess of net long-term capital gain
                     over net short-term capital losses) distributed to
                     shareholders.
 ...........................................................................
[>] TAXES
YOU MUST PAY TAXES ON YOUR PORTFOLIO'S EARNINGS WHETHER YOU TAKE YOUR PAYMENTS
IN CASH OR ADDITIONAL SHARES.
 ...........................................................................
TAX STATUS OF
DISTRIBUTIONS
                     The Portfolio will distribute
                     substantially all of its net
                     investment income (including net
                     short-term capital gains) and
                     net capital gain to
                     shareholders. Dividends from net
                     investment company taxable
                     income are taxable to
                     shareholders as ordinary income,
                     whether received in cash or in
                     additional shares, to the extent
                     of the Portfolio's earning and
                     profits. Distributions of net
                     capital gains are taxable to
                     shareholders as gain from the
                     sale or exchange of a capital
                     asset held for more than one
                     year regardless of how long
                     shareholders have held their
                     shares and regardless of whether the distributions are
                     received in cash or in
 ...........................................................................
[>] DISTRIBUTIONS
THE PORTFOLIO DISTRIBUTES INCOME DIVIDENDS AND CAPITAL GAINS. INCOME DIVIDENDS
REPRESENT THE EARNINGS FROM THE PORTFOLIO'S INVESTMENTS; CAPITAL GAINS
DISTRIBUTIONS OCCUR WHEN INVESTMENTS IN THE PORTFOLIO ARE SOLD FOR MORE THAN THE
ORIGINAL PURCHASE PRICE.
 ...........................................................................
 
                                                                              13
<PAGE>
                     additional shares. Dividends and distributions of capital
                     gains paid by the Portfolio do not qualify for the
                     dividends-received deduction for corporate shareholders.
                     The Portfolio will make annual reports to shareholders on
                     the federal income tax status of all distributions.
 
                           Dividends declared by the Portfolio in October,
                     November or December of any year and payable to
                     shareholders of record on a date in such a month will be
                     deemed to have been paid by the Portfolio and received by
                     the shareholders on December 31 of the year declared if
                     paid by the Portfolio at any time during the following
                     January.
 
                           The Portfolio intends to make sufficient
                     distributions prior to the end of each calendar year, to
                     avoid liability for the federal excise tax applicable to
                     regulated investment companies.
 
                           With respect to investments in U.S. Treasury STRIPS,
                     which are sold at original issue discount and thus do not
                     make periodic cash interest payments, the Portfolio will be
                     required to include as part of its current income the
                     imputed interest on such obligations even though the
                     Portfolio has not received any interest payments on such
                     obligations during that period. Because the Portfolio
                     distributes all of its net investment income to its
                     shareholders, the Portfolio may have to sell portfolio
                     securities to distribute such imputed income, which may
                     occur at a time when the Adviser would not have chosen to
                     sell such securities and, which may result in a taxable
                     gain or loss.
 
                           Investment income received by the Portfolio on direct
                     U.S. Government obligations is exempt from tax at the state
                     level when received directly by the Portfolio and may be
                     exempt, depending on the state, when received by a
                     shareholder as income dividends from the Portfolio provided
                     certain state-specific conditions are satisfied. Interest
                     received on repurchase agreements collateralized by U.S.
                     Government obligations normally is not exempt from state
                     taxation. The Portfolio will inform shareholders annually
                     of the percentage of income and distributions derived from
                     direct U.S. Government obligations. Shareholders should
                     consult their tax advisers to determine whether any portion
                     of the income dividends received from the Portfolio is
                     considered tax exempt in their particular states.
 
                           Each sale, exchange, or redemption of the Portfolio's
                     shares is a taxable transaction to the shareholder.
 
                                                                              14
<PAGE>
ADDITIONAL
INFORMATION ABOUT
DOING BUSINESS WITH
US  ____________________________________________________________________________
 
BUSINESS DAYS
                     You may buy, sell or exchange shares on days on which the
                     New York Stock Exchange is open for business ("Business
                     Days"). All purchase, exchange and redemption requests
                     received in "good order" will be effective as of the
                     Business Day received by the Transfer
                     Agent (or its authorized agent)
                     as long as the Transfer Agent
                     (or its authorized agent)
                     receives the order and, in the
                     case of a purchase request,
                     payment before the time at which
                     the Portfolio determines its net
                     asset value per share
                     (generally, 2:00 p.m., Eastern
                     time). Otherwise the purchase
                     will be effective when payment
                     is received. Broker-dealers may
                     have separate arrangements with
                     the Trust regarding the sale of
                     Class D shares, and may impose
                     their own cut-off times for
                     receipt of purchase and
                     redemption requests directed
                     through them.
 
                           If an exchange request is
                     for shares of a portfolio whose
                     net asset value is calculated as
                     of a time earlier than the time
                     at which the Portfolio
                     determines its net asset value
                     per share (generally, 2:00 p.m.,
                     Eastern time), the exchange
                     request will not be effective
                     until the next Business Day.
                     Anyone who wishes to make an exchange must have received a
                     current prospectus of the portfolio into which the exchange
                     is being made before the exchange will be effected.
 ...........................................................................
[>] BUY, EXCHANGE AND SELL REQUESTS ARE IN "GOOD ORDER" WHEN:
- - THE ACCOUNT NUMBER AND PORTFOLIO NAME ARE SHOWN
        - THE AMOUNT OF THE TRANSACTION IS SPECIFIED IN DOLLARS OR SHARES
        - SIGNATURES OF ALL OWNERS APPEAR EXACTLY AS THEY ARE REGISTERED ON THE
          ACCOUNT
        - ANY REQUIRED SIGNATURE GUARANTEES (IF APPLICABLE) ARE INCLUDED
        - OTHER SUPPORTING LEGAL DOCUMENTS (AS NECESSARY) ARE PRESENT
 ...........................................................................
MINIMUM INVESTMENTS
                     The minimum initial investment in the Portfolio's Class D
                     shares is $1,000; however, the minimum investment may be
                     waived at the Distributor's discretion. All subsequent
                     purchases must be at least $100 ($25 for payroll deductions
                     authorized pursuant to pre-approved payroll deduction
                     plans). The Trust reserves the right to reject a purchase
                     order when the Distributor determines that it is not in the
                     best interest of the Trust or its shareholders to accept
                     such order.
MAINTAINING A MINIMUM
ACCOUNT BALANCE
                     Due to the relatively high cost of handling small
                     investments, the Portfolio reserves the right to redeem, at
                     net asset value, the shares of any shareholder if, because
                     of redemptions of shares by or on behalf of the
                     shareholder, the account of such shareholder in the
                     Portfolio has a value of less than $1,000, the minimum
                     initial purchase amount. Accordingly, an investor
                     purchasing shares of the Portfolio in only the minimum
                     investment amount may be subject to such involuntary
                     redemption if he or she thereafter redeems
 
                                                                              15
<PAGE>
                     any of these shares. Before the Portfolio exercises its
                     right to redeem such shares and to send the proceeds to the
                     shareholder, the shareholder will be given notice that the
                     value of the shares in his or her account is less than the
                     minimum amount and will be allowed 60 days to make an
                     additional investment in that Portfolio in an amount that
                     will increase the value of the account to at least $1,000.
                     See "Purchase and Redemption of Shares" in the Statement of
                     Additional Information for examples of when the right of
                     redemption may be suspended.
 
                           At various times, the Portfolio may receive a request
                     to redeem shares for which it has not yet received good
                     payment. In such circumstances, redemption proceeds will be
                     forwarded upon collection of payment for the shares;
                     collection of payment may take up to 15 days. The Portfolio
                     intends to pay cash for all shares redeemed, but under
                     abnormal conditions that make payment in cash unwise,
                     payment may be made wholly or partly in portfolio
                     securities with a market value equal to the redemption
                     price. In such cases, an investor may incur brokerage costs
                     in converting such securities to cash.
NET ASSET VALUE
                     An order to buy shares will be executed at a per share
                     price equal to the net asset value next determined after
                     the receipt of the purchase order by the Transfer Agent
                     (the "offering price"). No certificates representing shares
                     will be issued. An order to sell shares will be executed at
                     the net asset value per share next determined after receipt
                     and effectiveness of a request for redemption in good
                     order. Net asset value per share is determined daily as of
                     2:00 p.m., Eastern time on any Business Day. Payment to
                     shareholders for shares redeemed will be made within 7 days
                     after receipt by the Transfer Agent of the redemption
                     order.
HOW THE NET ASSET VALUE
IS DETERMINED
                     The net asset value per share of the Portfolio is
                     determined by dividing the total market value of its
                     investments and other assets, less any liabilities, by the
                     total number of outstanding shares of the Portfolio.
                     Although the methodology and procedures for determining net
                     asset value per share are identical for both classes of the
                     Portfolio, the net asset value per share of one class may
                     differ from that of another class because of the different
                     distribution fees and/or shareholder servicing fees charged
                     to each class and the incremental transfer agent fees
                     charged to Class D shares.
SIGNATURE GUARANTEES
                     The Transfer Agent may require that the signatures on the
                     written request be guaranteed. You should be able to obtain
                     a signature guarantee from a bank, broker, dealer, certain
                     credit unions, securities exchange or association, clearing
                     agency or savings association. A notary public cannot
                     guarantee signatures. The signature guarantee requirement
                     will be waived if all of the following conditions apply:
                     (1) the redemption is for not more than $5,000 worth of
                     shares, (2) the redemption check is payable to the
                     shareholder(s) of record, and (3) the redemption check is
                     mailed to the shareholder(s) at his or her address of
                     record. The Trust and the Transfer Agent reserve the right
                     to amend these requirements without notice.
 
                                                                              16
<PAGE>
TELEPHONE/WIRE
INSTRUCTIONS
                     Redemption orders may be placed by telephone. Neither the
                     Trust nor the Transfer Agent will be responsible for any
                     loss, liability, cost or expense for acting upon wire
                     instructions or upon telephone instructions that it
                     reasonably believes to be genuine. The Trust and the
                     Transfer Agent will each employ reasonable procedures to
                     confirm that instructions communicated by telephone are
                     genuine, including requiring a form of personal
                     identification prior to acting upon instructions received
                     by telephone and recording telephone instructions. If
                     market conditions are extraordinarily active, or other
                     extraordinary circumstances exist, you experience
                     difficulties placing redemption orders by telephone and may
                     wish to consider placing orders by other means.
SYSTEMATIC WITHDRAWAL
PLAN ("SWP")
                     Please note that if withdrawals exceed income dividends,
                     your invested principal in the account will be depleted.
                     Thus, depending upon the frequency and amounts of the
                     withdrawal payments and/or any fluctuations in the net
                     asset value per share, your original investment could be
                     exhausted entirely. To participate in the SWP, you must
                     have your dividends automatically reinvested. You may
                     change or cancel the SWP at any time, upon written notice
                     to the Transfer Agent.
HOW TO CLOSE YOUR
ACCOUNT
                     An account may be closed by providing written notice to the
                     Transfer Agent. You may also close your account by
                     telephone if you have previously elected telephone options
                     on your account application.
 
GENERAL
INFORMATION
         _______________________________________________________________________
 
THE TRUST
                     SEI Liquid Asset Trust was organized as a Massachusetts
                     business trust under a Declaration of Trust dated July 20,
                     1981. The Declaration of Trust permits the Trust to offer
                     separate Portfolios of shares and different classes of each
                     Portfolio. Shareholders may purchase shares in Portfolios
                     through two separate classes: Class A and Class D, which
                     provide for variation in distribution, shareholder
                     servicing and transfer agent costs, voting rights, and
                     dividends. This Prospectus offers the Class D shares of the
                     Trust's Treasury Securities Portfolio. In addition to the
                     Portfolio, the Trust consists of the following other
                     portfolios: Government Securities Portfolio, Institutional
                     Cash Portfolio, Prime Obligation Portfolio, and Money
                     Market Portfolio. Additional information pertaining to the
                     Trust may be obtained by writing to SEI Fund Management,
                     Oaks, Pennsylvania 19456, or by calling 1-800-437-6016. All
                     consideration received by the Trust for shares of any
                     Portfolio or class and all assets of such Portfolio or
                     class belong to that Portfolio or class and are subject to
                     liabilities related thereto.
 
                           The Trust pays its expenses, including fees of its
                     service providers, audit and legal expenses, expenses of
                     preparing prospectuses, proxy solicitation material and
                     reports to shareholders, costs of custodial services and
                     registering the shares under federal and state securities
                     laws, pricing, insurance expenses, litigation and other
                     extraordinary expenses, brokerage costs, interest charges,
                     taxes and organization expenses.
 
                                                                              17
<PAGE>
TRUSTEES OF THE TRUST
                     The management and affairs of the Trust are supervised by
                     the Trustees under the laws of the Commonwealth of
                     Massachusetts. The Trustees have approved contracts under
                     which, as described above, certain companies provide
                     essential management services to the Trust.
VOTING RIGHTS
                     Each share held entitles the shareholder of record to one
                     vote. The shareholders of each portfolio or class of the
                     Trust will vote separately on matters relating solely to
                     that Portfolio or class. As a Massachusetts business trust,
                     the Trust is not required to hold annual meetings of
                     shareholders, but approval will be sought for certain
                     changes in the operation of the Trust and for the election
                     of Trustees under certain circumstances. In addition, a
                     Trustee may be removed by the remaining Trustees or by
                     shareholders at a special meeting called upon written
                     request of shareholders owning at least 10% of the
                     outstanding shares of the Trust. In the event that such a
                     meeting is requested, the Trust will provide appropriate
                     assistance and information to the shareholders requesting
                     the meeting.
REPORTING
                     The Trust issues unaudited financial statements
                     semi-annually and audited financial statements annually.
                     The Trust furnishes proxy statements and other reports to
                     shareholders of record.
SHAREHOLDER INQUIRIES
                     Shareholder inquiries should be directed to DST Systems,
                     Inc., P.O. Box 419240, Kansas City, MO 64141-6240.
DIVIDENDS
                     Substantially all of the net investment income (exclusive
                     of capital gains) of the Portfolio is distributed in the
                     form of dividends that will be declared daily and paid
                     monthly on the first Business Day of each month. Dividends
                     will be paid on the next Business Day to shareholders who
                     redeem all of their shares of a Portfolio at any other time
                     during the month. Currently, capital gains (the excess of
                     net long-term capital gain over net short-term capital
                     loss) realized, if any, are distributed at least annually.
 
                           Shareholders in the Portfolio automatically receive
                     all income dividends and capital gain distributions in
                     additional shares at the net asset value next determined
                     following the record date, unless the shareholder has
                     elected to take such payment in cash. Shareholders may
                     change their election by providing written notice to the
                     Manager at least 15 days prior to the distribution.
 
                           Dividends and distributions of the Portfolio are paid
                     by the Portfolio on a per-share basis. The value of each
                     share will be reduced by the amount of any such payment. If
                     shares are purchased shortly before the record date for a
                     dividend or the distribution of capital gains, a
                     shareholder will pay the full price for the shares and
                     receive some portion of the price back as a taxable
                     dividend or distribution.
COUNSEL AND INDEPENDENT
ACCOUNTANTS
                     Morgan, Lewis & Bockius LLP serves as counsel to the Trust.
                     Price Waterhouse LLP serves as the independent accountants
                     to the Trust.
CUSTODIAN AND WIRE AGENT
                     CoreStates Bank, N.A., Broad and Chestnut Streets, P.O. Box
                     7618, Philadelphia, Pennsylvania 19101 (the "Custodian"),
                     serves as custodian of the Trust's assets and as
 
                                                                              18
<PAGE>
                     wire agent of the Trust. The Custodian holds cash,
                     securities and other assets of the Trust as required by the
                     1940 Act.
 
DESCRIPTION OF
PERMITTED
INVESTMENTS
AND RISK FACTORS
               _________________________________________________________________
 
                     The following is a description of certain of the permitted
                     investments for the Portfolio, and the associated risk
                     factors:
ILLIQUID SECURITIES
                     Illiquid Securities are securities which cannot be disposed
                     of within seven business days at approximately the price at
                     which they are being carried on a Portfolio's books.
                     Illiquid securities may include demand instruments with
                     demand notice periods exceeding seven days, securities for
                     which there is no active secondary market, and repurchase
                     agreements with maturities or durations of more than seven
                     days in length.
REPURCHASE AGREEMENTS
                     Repurchase agreements are agreements by which the Portfolio
                     obtains a security and simultaneously commits to return the
                     security to the seller at an agreed upon price on an agreed
                     upon date within a number of days from the date of
                     purchase. The Portfolio will have actual or constructive
                     possession of the securities held as collateral for the
                     repurchase agreement. The Portfolio bears a risk of loss in
                     the event the other party defaults on its obligations and
                     the Portfolio is delayed or prevented from exercising its
                     right to dispose of the collateral securities or if the
                     Portfolio realizes a loss on the sale of the collateral.
                     The Portfolio will enter into repurchase agreements only
                     with financial institutions deemed to present minimal risk
                     of bankruptcy during the term of the agreement based on
                     established guidelines. Repurchase agreements are
                     considered loans under the 1940 Act.
U.S. TREASURY
OBLIGATIONS
                     U.S. Treasury Obligations consist of bills, notes and bonds
                     issued by the U.S. Treasury, as well as separately traded
                     interest and principal component parts of such obligations,
                     known as Separately Traded Registered Interest and
                     Principal Securities ("STRIPS"), that are transferable
                     through the federal book-entry system.
 
                           STRIPS are sold as zero coupon securities which means
                     that they are sold at a substantial discount and redeemed
                     at face value at their maturity date without interim cash
                     payments of interest or principal. This discount is
                     accreted over the life of the security, and such accretion
                     will constitute the income earned on the security for both
                     accounting and tax purposes. Because of these features,
                     such securities may be subject to greater interest rate
                     volatility than interest paying permitted investments.
WHEN-ISSUED AND DELAYED
DELIVERY SECURITIES
                     When-issued or delayed delivery transactions involve the
                     purchase of an instrument with payment and delivery taking
                     place in the future. Delivery of and payment for these
                     securities may occur a month or more after the date of the
                     purchase commitment. The Portfolio will maintain with the
                     custodian a separate account, with liquid securities or
                     cash in an amount at least equal to these commitments. The
                     interest rate realized on these securities is fixed as of
                     the purchase date and no interest accrues to the Portfolio
                     before settlement.
 
                                                                              19
<PAGE>
SEI LIQUID ASSET TRUST
 
OCTOBER 30, 1997
 
- --------------------------------------------------------------------------------
 
TREASURY SECURITIES PORTFOLIO
 
GOVERNMENT SECURITIES PORTFOLIO
 
PRIME OBLIGATION PORTFOLIO
 
INSTITUTIONAL CASH PORTFOLIO
 
MONEY MARKET PORTFOLIO
 
- --------------------------------------------------------------------------------
 
This Prospectus sets forth concisely information about the above-referenced
Portfolios that an investor needs to know before investing. Please read this
Prospectus carefully, and keep it on file for future reference.
 
A Statement of Additional Information dated October 30, 1997, has been filed
with the Securities and Exchange Commission, and is available upon request and
without charge by writing the Distributor, SEI Investments Distribution Co.,
Oaks, Pennsylvania 19456, or by calling 1-800-342-5734. The Statement of
Additional Information is incorporated by reference into this Prospectus.
 
SEI Liquid Asset Trust (the "Trust") is an open-end management investment
company, certain classes of which offer financial institutions a convenient
means of investing their own funds, or funds for which they act in a fiduciary,
agency or custodial capacity, in one or more professionally managed diversified
portfolios of securities. Some portfolios offer separate classes of units of
beneficial interest that differ from each other primarily in the allocation of
certain distribution expenses and minimum investment amounts. This Prospectus
offers Class A shares of each of the Trust's five money market portfolios (each
a "Portfolio" and, together, the "Portfolios") listed above.
 
AN INVESTMENT IN A PORTFOLIO IS NEITHER INSURED NOR GUARANTEED BY THE U.S.
GOVERNMENT, AND THERE CAN BE NO ASSURANCE THAT A PORTFOLIO WILL BE ABLE TO
MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.
 
- --------------------------------------------------------------------------------
 
 THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION, NOR HAS THE SECURITIES AND EXCHANGE COMMISSION PASSED
 UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
 CONTRARY IS A CRIMINAL OFFENSE.
 THE TRUST'S SHARES ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR
 ENDORSED BY, ANY BANK. THE SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL
 DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD OR ANY OTHER
 GOVERNMENT AGENCY. INVESTMENT IN THE SHARES INVOLVES RISK, INCLUDING POSSIBLE
 LOSS OF THE PRINCIPAL AMOUNT INVESTED.
<PAGE>
ANNUAL OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                              TREASURY   GOVERNMENT      PRIME     INSTITUTIONAL   MONEY
                                                             SECURITIES  SECURITIES   OBLIGATION      CASH        MARKET
                                                             PORTFOLIO    PORTFOLIO    PORTFOLIO    PORTFOLIO   PORTFOLIO
                                                             ----------  -----------  -----------  -----------  ----------
<S>                                                          <C>         <C>          <C>          <C>          <C>
Management/Advisory Fees (AFTER FEE WAIVERS) (1)                   .41%        .43%          .41%        .36%         .39%
12b-1 Fees                                                         None        None          None        None         None
Total Other Expenses                                               .03%        .01%          .03%        .08%         .05%(2)
  Shareholder Servicing Expenses (AFTER FEE WAIVERS) (3)       .00%        .00%          .00%        .00%         .00%
- --------------------------------------------------------------------------------------------------------------------------
Total Operating Expenses (AFTER FEE WAIVERS) (4)                   .44%        .44%          .44%        .44%         .44%
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) THE MANAGER HAS AGREED TO WAIVE ITS FEE IN AN AMOUNT NECESSARY TO LIMIT THE
    TOTAL OPERATING EXPENSES OF EACH PORTFOLIO TO NOT MORE THAN .44% OF ITS
    AVERAGE NET ASSETS. IN THE CASE OF THE INSTITUTIONAL CASH PORTFOLIO, THIS
    WAIVER IS VOLUNTARY AND MAY BE TERMINATED AT ANY TIME IN THE MANAGER'S SOLE
    DISCRETION. ABSENT THIS WAIVER, MANAGEMENT/ADVISORY FEES FOR THE TREASURY
    SECURITIES, GOVERNMENT SECURITIES, PRIME OBLIGATION AND MONEY MARKET
    PORTFOLIOS, WOULD BE .45%, .45%, .45%, AND .45%, RESPECTIVELY.
    MANAGEMENT/ADVISORY FEES HAVE BEEN RESTATED TO REFLECT CURRENT EXPENSES.
 
(2) TOTAL OTHER EXPENSES FOR THE MONEY MARKET PORTFOLIO ARE BASED ON ESTIMATED
    AMOUNTS FOR THE CURRENT FISCAL YEAR.
 
(3) THE DISTRIBUTOR HAS WAIVED, ON A VOLUNTARY BASIS, ALL OR A PORTION OF ITS
    SHAREHOLDER SERVICING FEE, AND THE SHAREHOLDER SERVICING EXPENSES SHOWN
    REFLECT THIS WAIVER. THE DISTRIBUTOR RESERVES THE RIGHT TO TERMINATE ITS
    WAIVER AT ANY TIME IN ITS SOLE DISCRETION. ABSENT SUCH WAIVER, SHAREHOLDER
    SERVICING EXPENSES WOULD BE .25% FOR EACH PORTFOLIO.
 
(4) ABSENT WAIVERS, TOTAL OPERATING EXPENSES FOR THE TREASURY SECURITIES,
    GOVERNMENT SECURITIES, PRIME OBLIGATION, INSTITUTIONAL CASH AND MONEY MARKET
    PORTFOLIOS WOULD BE .73%, .71%, .73%, .69%, AND .75%, RESPECTIVELY.
    ADDITIONAL INFORMATION MAY BE FOUND UNDER "THE MANAGER," "THE ADVISER" AND
    "DISTRIBUTION AND SHAREHOLDER SERVICING."
 
EXAMPLE
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                    1 YR.       3 YRS.       5 YRS.       10 YRS.
                                                                                 -----------  -----------  -----------  -----------
<S>                                                                              <C>          <C>          <C>          <C>
An investor in any Portfolio would pay the following expenses on a $1,000
  investment assuming (1) a 5% annual return and (2) redemption at the end of
  each time period:                                                               $       5    $      14    $      25    $      55
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
THE EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF FUTURE EXPENSES. ACTUAL
EXPENSES MAY BE GREATER OR LESS THAN THOSE SHOWN.
 
THE PURPOSE OF THE EXPENSE TABLE AND EXAMPLE IS TO ASSIST THE INVESTOR IN
UNDERSTANDING THE VARIOUS COSTS AND EXPENSES THAT MAY BE DIRECTLY OR INDIRECTLY
BORNE BY INVESTORS IN CLASS A SHARES OF THE PORTFOLIOS. THE TREASURY SECURITIES
PORTFOLIO ALSO OFFERS CLASS D SHARES, WHICH ARE SUBJECT TO THE SAME EXPENSES
EXCEPT THAT CLASS D SHARES BEAR CERTAIN DISTRIBUTION AND TRANSFER AGENT COSTS. A
PERSON WHO PURCHASES SHARES THROUGH A FINANCIAL INSTITUTION MAY BE CHARGED
SEPARATE FEES BY THAT INSTITUTION. ADDITIONAL INFORMATION REGARDING THESE
DIFFERENCES MAY BE FOUND UNDER "THE MANAGER," "THE ADVISER" AND "DISTRIBUTION
AND SHAREHOLDER SERVICING".
 
                                                                               2
<PAGE>
FINANCIAL HIGHLIGHTS
                  ______________________________________________________________
 
The following financial highlights for a share outstanding throughout each
period have been audited by Price Waterhouse LLP, the Trust's independent
accountants, whose report on the financial statements including this
information, dated August 7, 1997, was unqualified. This information should be
read in conjunction with the Trust's financial statements as of and for the
fiscal year ended June 30, 1997, and notes thereto, which are incorporated by
reference to the Trust's Statement of Additional Information. Additional
performance information is set forth in the Trust's 1997 Annual Report to
Shareholders, which is available upon request and without charge by calling
1-800-342-5734. As of June 30, 1997, the Money Market Portfolio had not
commenced operations.
 
FOR A CLASS A SHARE OUTSTANDING THROUGHOUT EACH PERIOD
<TABLE>
<CAPTION>
                                NET ASSET                                   DISTRIBUTIONS
                                  VALUE        NET         REALIZED AND      FROM NET    DISTRIBUTIONS   NET ASSET
                                BEGINNING   INVESTMENT   UNREALIZED GAINS   INVESTMENT   FROM REALIZED   VALUE END
                                OF PERIOD     INCOME      ON SECURITIES       INCOME     CAPITAL GAINS   OF PERIOD
- ------------------------------  ----------------------------------------------------------------------------------
<S>                             <C>         <C>          <C>                <C>          <C>             <C>
- --------------------
TREASURY SECURITIES
- --------------------
  1997                           $ 1.00       $   0.05        $   --          $  (0.05)     $       --    $ 1.00
  1996                             1.00           0.05            --             (0.05)             --      1.00
  1995                             1.00           0.05            --             (0.05)             --      1.00
  1994                             1.00           0.03            --             (0.03)             --      1.00
  1993                             1.00           0.03            --             (0.03)             --      1.00
  1992                             1.00           0.05            --             (0.05)             --      1.00
  1991                             1.00           0.07            --             (0.07)             --      1.00
  1990                             1.00           0.08            --             (0.08)             --      1.00
  1989                             1.00           0.08            --             (0.08)             --      1.00
  1988                             1.00           0.06            --             (0.06)             --      1.00
- -----------------------
GOVERNMENT SECURITIES
- -----------------------
  1997                           $ 1.00       $   0.05        $   --          $  (0.05)     $       --    $ 1.00
  1996                             1.00           0.05            --             (0.05)             --      1.00
  1995                             1.00           0.05            --             (0.05)             --      1.00
  1994                             1.00           0.03            --             (0.03)             --      1.00
  1993                             1.00           0.03            --             (0.03)             --      1.00
  1992                             1.00           0.05            --             (0.05)             --      1.00
  1991                             1.00           0.07            --             (0.07)             --      1.00
  1990                             1.00           0.08            --             (0.08)             --      1.00
  1989                             1.00           0.08            --             (0.08)             --      1.00
  1988                             1.00           0.07            --             (0.07)             --      1.00
 
<CAPTION>
                                                                                                  RATIO OF
                                                                                                    NET
                                                                        RATIO OF     RATIO OF    INVESTMENT
                                                                          NET        EXPENSES    INCOME TO
                                                           RATIO OF    INVESTMENT   TO AVERAGE    AVERAGE
                                            NET ASSETS     EXPENSES    INCOME TO    NET ASSETS   NET ASSETS
                                 TOTAL        END OF      TO AVERAGE    AVERAGE     (EXCLUDING   (EXCLUDING
                                 RETURN    PERIOD (000)   NET ASSETS   NET ASSETS    WAIVERS)     WAIVERS)
- ------------------------------  ---------------------------------------------------------------------------
<S>                             <C>        <C>            <C>          <C>          <C>          <C>
- --------------------
TREASURY SECURITIES
- --------------------
  1997                             5.10%     $  706,232      0.44%        4.98%        0.74%        4.68%
  1996                             5.37         832,393      0.44         5.27         0.52         5.19
  1995                             5.05       1,254,888      0.44         4.93         0.54         4.83
  1994                             3.00       1,501,510      0.44         2.91         0.51         2.84
  1993                             3.03       2,219,701      0.44         2.99         0.50         2.93
  1992                             4.69       2,304,153      0.44         4.60         0.50         4.50
  1991                             7.04       2,248,497      0.44         6.80         0.47         6.80
  1990                             8.41       2,076,845      0.44         8.10         0.45         8.10
  1989                             8.51       2,318,763      0.44         8.20         0.44         8.20
  1988                             6.56       2,671,802      0.44         6.40         0.44         6.40
- -----------------------
GOVERNMENT SECURITIES
- -----------------------
  1997                             5.09%     $  148,606      0.44%        4.98%        0.71%        4.71%
  1996                             5.30         169,133      0.44         5.19         0.54         5.09
  1995                             5.18         200,768      0.44         5.04         0.53         4.95
  1994                             3.04         255,554      0.44         2.96         0.51         2.89
  1993                             3.05         507,832      0.44         3.00         0.50         2.94
  1992                             4.72         399,938      0.44         4.60         0.50         4.60
  1991                             7.08         520,187      0.44         6.80         0.48         6.70
  1990                             8.48         368,318      0.44         8.10         0.45         8.10
  1989                             8.69         467,056      0.44         8.30         0.46         8.30
  1988                             6.83         523,274      0.44         6.70         0.44         6.70
</TABLE>
 
                                                                               3
<PAGE>
FINANCIAL HIGHLIGHTS (CONTINUED) _______________________________________________
 
FOR A CLASS A SHARE OUTSTANDING THROUGHOUT EACH PERIOD
<TABLE>
<CAPTION>
                                NET ASSET                                   DISTRIBUTIONS
                                  VALUE        NET         REALIZED AND      FROM NET    DISTRIBUTIONS   NET ASSET
                                BEGINNING   INVESTMENT   UNREALIZED GAINS   INVESTMENT   FROM REALIZED   VALUE END
                                OF PERIOD     INCOME      ON SECURITIES       INCOME     CAPITAL GAINS   OF PERIOD
- ------------------------------  ----------------------------------------------------------------------------------
<S>                             <C>         <C>          <C>                <C>          <C>             <C>
- -----------------
PRIME OBLIGATION
- -----------------
  1997                           $ 1.00       $   0.05        $   --          $  (0.05)     $       --    $ 1.00
  1996                             1.00           0.05            --             (0.05)             --      1.00
  1995                             1.00           0.05            --             (0.05)             --      1.00
  1994                             1.00           0.03            --             (0.03)             --      1.00
  1993                             1.00           0.03            --             (0.03)             --      1.00
  1992                             1.00           0.05            --             (0.05)             --      1.00
  1991                             1.00           0.07            --             (0.07)             --      1.00
  1990                             1.00           0.08            --             (0.08)             --      1.00
  1989                             1.00           0.09            --             (0.09)             --      1.00
  1988                             1.00           0.07            --             (0.07)             --      1.00
- -------------------
INSTITUTIONAL CASH*
- -------------------
  1997                           $ 1.00       $ 0.0002        $   --          $(0.0002)     $       --    $ 1.00
  1996                             1.00         0.0005            --           (0.0005)             --      1.00
  1995                             1.00         0.0003            --           (0.0003)             --      1.00
  1994                             1.00         0.0003            --           (0.0003)             --      1.00
  1993                             1.00         0.0003            --           (0.0003)             --      1.00
  1992                             1.00         0.0002            --           (0.0002)             --      1.00
  1991                             1.00         0.0003        0.0001           (0.0003)        (0.0001)     1.00
  1990                             1.00         0.0008        0.0003           (0.0008)        (0.0003)     1.00
  1989                             1.00         0.0007        0.0002           (0.0007)        (0.0002)     1.00
  1988                             1.00         0.0006        0.0001           (0.0006)        (0.0001)     1.00
 
<CAPTION>
                                                                                                  RATIO OF
                                                                                                    NET
                                                                        RATIO OF     RATIO OF    INVESTMENT
                                                                          NET        EXPENSES    INCOME TO
                                                           RATIO OF    INVESTMENT   TO AVERAGE    AVERAGE
                                            NET ASSETS     EXPENSES    INCOME TO    NET ASSETS   NET ASSETS
                                 TOTAL        END OF      TO AVERAGE    AVERAGE     (EXCLUDING   (EXCLUDING
                                 RETURN    PERIOD (000)   NET ASSETS   NET ASSETS    WAIVERS)     WAIVERS)
- ------------------------------  ---------------------------------------------------------------------------
<S>                             <C>        <C>            <C>          <C>          <C>          <C>
- -----------------
PRIME OBLIGATION
- -----------------
  1997                             5.20%     $  823,270      0.44%        5.08%        0.74%        4.78%
  1996                             5.39         747,852      0.44         5.27         0.53         5.18
  1995                             5.20         940,863      0.44         5.21         0.53         5.12
  1994                             3.08         918,509      0.44         3.03         0.51         2.96
  1993                             3.07       1,173,109      0.44         3.04         0.50         2.98
  1992                             4.73       1,515,554      0.44         4.70         0.49         4.60
  1991                             7.36       1,729,845      0.44         7.10         0.47         7.10
  1990                             8.57       1,804,367      0.44         8.30         0.45         8.30
  1989                             8.85       2,160,859      0.44         8.50         0.44         8.50
  1988                             7.12       2,224,159      0.44         6.90         0.44         6.90
- -------------------
INSTITUTIONAL CASH*
- -------------------
  1997                             3.94%     $       --      0.44%        3.94%        0.69%        3.69%
  1996                             4.58              --      0.44         4.58         0.44         4.58
  1995                             4.94              --      0.44         5.19         0.44         5.19
  1994                             2.60              --      0.44         2.63         0.44         2.63
  1993                             2.83              --      0.44         2.66         0.44         2.66
  1992                             3.47              --      0.44         3.50         0.44         3.50
  1991                             7.12              --      0.42         5.90         0.42         5.90
  1990                            10.22              --      0.44         7.80         0.44         7.80
  1989                             8.49              --      0.44         6.80         0.44         6.80
  1988                             4.02              --      0.44         5.20         0.44         5.20
</TABLE>
 
  * ANNUALIZED
    AMOUNTS DESIGNATED AS "--" ARE NEITHER $0 OR HAVE BEEN ROUNDED TO $0.
 
                                                                               4
<PAGE>
THE TRUST
      __________________________________________________________________________
 
SEI LIQUID ASSET TRUST (the "Trust") is an open-end management investment
company that offers units of beneficial interest ("shares") in separate
diversified investment portfolios. This Prospectus offers Class A shares of the
Trust's Treasury Securities, Government Securities, Prime Obligation,
Institutional Cash and Money Market Portfolios (each a "Portfolio" and,
together, the "Portfolios"). The Treasury Securities Portfolio also offers Class
D shares. Additional information pertaining to the Trust may be obtained by
writing to SEI Investments Distribution Co., Oaks, Pennsylvania 19456, or by
calling 1-800-342-5734.
 
INVESTMENT
OBJECTIVES AND
POLICIES
     ___________________________________________________________________________
TREASURY SECURITIES
PORTFOLIO
                     The Treasury Securities Portfolio seeks to preserve
                     principal value and maintain a high degree of liquidity
                     while providing current income.
 
                           The Portfolio invests exclusively in U.S. Treasury
                     obligations and repurchase agreements involving such
                     obligations. The repurchase agreement dealers selected for
                     the Treasury Securities Portfolio must meet certain
                     creditworthiness criteria established by Standard & Poor's
                     Corporation ("S&P").
 
GOVERNMENT
SECURITIES PORTFOLIO
                     The Government Securities Portfolio seeks to preserve
                     principal value and maintain a high degree of liquidity
                     while providing current income.
 
                           The Portfolio invests exclusively in U.S. Treasury
                     obligations, obligations issued or guaranteed as to
                     principal and interest by agencies or instrumentalities of
                     the U.S. Government, and repurchase agreements involving
                     such obligations.
 
PRIME OBLIGATION
PORTFOLIO
                     The Prime Obligation Portfolio seeks to preserve principal
                     value and maintain a high degree of liquidity while
                     providing current income.
 
                           The Portfolio invests exclusively in: (i) commercial
                     paper rated at least A-1 by S&P or Prime-1 by Moody's
                     Investors Service, Inc. ("Moody's") at the time of
                     investment or, if not rated, determined by the Adviser to
                     be of comparable quality; (ii) obligations (including
                     certificates of deposit, time deposits, bankers'
                     acceptances and bank notes) of U.S. commercial banks or
                     savings and loan institutions that are members of the
                     Federal Reserve System or are insured by the Federal
                     Deposit Insurance Corporation, which banks or institutions
                     have total assets of $500 million or more as shown on their
                     most recent public financial statements, at the time of
                     investment, provided that such obligations are rated in the
                     top two short-term rating categories by two or more
                     nationally recognized statistical rating organizations
                     ("NRSROs"), or one NRSRO if only one NRSRO has rated the
                     security at the time of investment or, if not rated,
                     determined by the Adviser to be of comparable quality;
                     (iii) short-term corporate obligations rated AAA or AA by
                     S&P or Aaa or Aa by Moody's at the time of investment or,
                     if not rated, determined by the Adviser to be of comparable
                     quality; (iv) short-term obligations issued by state and
                     local
 
                                                                               5
<PAGE>
                     governmental issuers, which are rated, at the time of
                     investment, by at least two NRSROs in one of the two
                     highest municipal bond rating categories, and which carry
                     yields that are competitive with those of other types of
                     money market instruments of comparable quality; (v) U.S.
                     Treasury obligations and obligations issued or guaranteed
                     as to principal and interest by agencies or
                     instrumentalities of the U.S. Government; and (vi)
                     repurchase agreements involving any of the foregoing
                     obligations.
 
INSTITUTIONAL CASH
PORTFOLIO
                     The Institutional Cash Portfolio seeks to preserve
                     principal value and maintain a high degree of liquidity
                     while providing current income.
 
                           The Portfolio invests exclusively in U.S. Treasury
                     obligations.
 
MONEY MARKET
PORTFOLIO
                     The Money Market Portfolio seeks to preserve principal
                     value and maintain a high degree of liquidity while
                     providing current income.
 
                           The Portfolio invests in the following U.S. dollar
                     denominated obligations: (i) commercial paper issued by
                     U.S. and foreign issuers rated at the time of investment in
                     the highest short-term rating category by two or more
                     NRSROs, or one NRSRO if only one NRSRO has rated the
                     security or, if not rated, determined by the Adviser to be
                     of comparable quality; (ii) obligations (including
                     certificates of deposit, time deposits, bankers'
                     acceptances and bank notes) of U.S. savings and loan and
                     thrift institutions, U.S. commercial banks (including
                     foreign branches of such banks), and U.S. and London
                     branches of foreign banks, provided that such institutions
                     (or, in the case of a branch, the parent institution) have
                     total assets of $1 billion or more as shown on their last
                     published financial statements, at the time of investment;
                     (iii) short-term corporate obligations issued by U.S. and
                     foreign issuers with a remaining term of not more than 397
                     days that issue commercial paper of comparable priority and
                     security meeting the above ratings; (iv) short-term
                     obligations issued by state and local governmental issuers
                     which are rated, at the time of investment, by at least two
                     NRSROs in one of the two highest municipal bond rating
                     categories, or, if not rated, determined by the Adviser to
                     be of comparable quality, and which carry yields that are
                     competitive with those of other types of money market
                     instruments of comparable quality; (v) U.S. Treasury
                     obligations and obligations issued or guaranteed as to
                     principal and interest by the agencies or instrumentalities
                     of the U.S. Government; (vi) U.S. dollar denominated
                     obligations of foreign governments, including Canadian and
                     Provincial Government and Crown Agency obligations; (vii)
                     repurchase agreements involving any of the foregoing
                     obligations; and (viii) custodial receipts representing
                     investments in component parts of U.S. Treasury
                     obligations.
 
                           There can be no assurance that the Portfolios will
                     achieve their respective investment objectives.
 
                                                                               6
<PAGE>
GENERAL INVESTMENT
POLICIES
     ___________________________________________________________________________
 
                     In purchasing obligations, each Portfolio complies with the
                     requirements of Rule 2a-7 under the 1940 Act, as that Rule
                     may be amended from time to time. These requirements
                     currently provide that each Portfolio must limit its
                     investments to securities with remaining maturities of 397
                     days or less, and must maintain a dollar-weighted average
                     maturity of 90 days or less. In addition, Rule 2a-7
                     provides that funds may only invest in securities (other
                     than U.S. Government Securities) rated in one of the two
                     highest categories for short-term securities by at least
                     two NRSROs (or by one NRSRO if only one NRSRO has rated the
                     security), or, if unrated, determined by the fund's adviser
                     (in accordance with procedures adopted by the Trust's Board
                     of Trustees) to be of equivalent quality to rated
                     securities in which the fund may invest. Except to the
                     extent that their investment policies are more restrictive
                     than Rule 2a-7 or that Rule 2a-7's provisions are
                     inapplicable, each Portfolio intends to comply fully with
                     Rule 2a-7.
 
                           Securities rated in the highest rating category by at
                     least two NRSROs (or, if unrated, determined by the Adviser
                     to be of comparable quality) are "first tier" securities.
                     Non-first tier securities in the second highest rating
                     category by at least one NRSRO (or, if unrated, determined
                     by the Adviser to be of comparable quality) are considered
                     to be "second tier" securities. Each of the Money Market
                     and Prime Obligation Portfolios will invest, in the
                     aggregate, no more than 5% of its assets in second tier
                     securities, and any investment in any one second tier
                     security is limited to the greater of 1% of a Portfolio's
                     total assets or $1 million, except that the Prime
                     Obligation Portfolio currently invests only in first tier
                     securities.
 
                           The quality, maturity and diversification
                     requirements of the Government Securities and Prime
                     Obligation Portfolios are more restrictive than those
                     imposed by Rule 2a-7. The Government Securities and Prime
                     Obligation Portfolios may only purchase securities with a
                     remaining maturity of 365 days or less, and, as a matter of
                     non-fundamental policy, will maintain a dollar-weighted
                     average portfolio maturity of 90 days or less. If
                     Shareholders of these Portfolios elect to modify the
                     Portfolios' investment limitations in the future, the
                     Portfolios could take advantage of certain provisions in
                     the Rule that are more liberal than the Portfolios'
                     policies and that are followed by the Trust's other
                     Portfolios.
 
                           The Money Market and Prime Obligation Portfolios may
                     invest up to 10% of their net assets in illiquid
                     securities. However, restricted securities, including Rule
                     144A securities and Section 4(2) commercial paper, that
                     meet the criteria established by the Board of Trustees of
                     the Trust will be considered liquid.
 
                           Each Portfolio may purchase securities on a
                     when-issued or delayed delivery basis.
 
                           For additional information regarding the Portfolios'
                     permitted investments and the ratings referred to above,
                     see "Description of Permitted Investments and Risk Factors"
                     and the Statement of Additional Information.
 
                                                                               7
<PAGE>
INVESTMENT
LIMITATIONS
        ________________________________________________________________________
 
                     The investment objective and certain of the investment
                     limitations are fundamental policies of the Portfolios.
                     Fundamental policies cannot be changed with respect to a
                     Portfolio without the consent of the holders of a majority
                     of that Portfolio's outstanding shares.
 
                           It is a fundamental policy of each Portfolio to use
                     its best efforts to maintain a constant net asset value of
                     $1.00 per share. In addition, it is a fundamental policy of
                     each of the Government Securities and Prime Obligation
                     Portfolios to invest its assets solely in the securities
                     listed as appropriate investments for that Portfolio.
 
                     EACH PORTFOLIO MAY NOT:
 
                     1. Purchase securities of any issuer (except securities
                        issued or guaranteed by the U.S. Government, its
                        agencies or instrumentalities and any securities
                        guaranteed thereby) if as a result more than 5% of the
                        total assets of the Portfolio (based on fair market
                        value at the time of investment) would be invested in
                        the securities of such issuer; provided, however, that
                        the Treasury Securities, Money Market and Institutional
                        Cash Portfolios may temporarily invest up to 25% of
                        their total assets without regard to this restriction as
                        permitted by Rule 2a-7.
 
                     2. Purchase any securities which would cause more than 25%
                        of the total assets of the Portfolio to be invested in
                        the securities of one or more issuers conducting their
                        principal business activities in the same industry,
                        provided that this limitation does not apply to
                        investments in (a) domestic banks and (b) obligations
                        issued or guaranteed by the U.S. Government or its
                        agencies and instrumentalities.
 
                     3. Borrow money except for temporary or emergency purposes
                        and then only in an amount not exceeding 10% of the
                        value of the total assets of that Portfolio. This
                        borrowing provision is included solely to facilitate the
                        orderly sale of portfolio securities to accommodate
                        substantial redemption requests if they should occur and
                        is not for investment purposes. All borrowings will be
                        repaid before making additional investments for that
                        Portfolio and any interest paid on such borrowings will
                        reduce the income of that Portfolio.
 
                     The foregoing percentage limitations will apply at the time
                     of the purchase of a security. Additional investment
                     limitations are set forth in the Statement of Additional
                     Information.
THE MANAGER
          ______________________________________________________________________
 
                     SEI Fund Management ("SEI Management"), provides the Trust
                     with overall management services, regulatory reporting, all
                     necessary office space, equipment, personnel and
                     facilities, and acts as dividend disbursing agent and
                     shareholder servicing agent. SEI Management also serves as
                     transfer agent (the "Transfer Agent") to Class A shares of
                     the Trust.
 
                                                                               8
<PAGE>
                           For its management services, SEI Management is
                     entitled to a fee, which is calculated daily and paid
                     monthly, at an annual rate of .42% of the average daily net
                     assets of each Portfolio, except the Institutional Cash
                     Portfolio, for which SEI Management is entitled to a fee of
                     .36% of the Portfolio's average daily net assets. SEI
                     Management has contractually agreed to waive all or a
                     portion of its fee with respect to each Portfolio, except
                     the Institutional Cash Portfolio, in order to limit the
                     total operating expenses of the Class A shares of such
                     Portfolios to not more than .44% of its average daily net
                     assets. For the Institutional Cash Portfolio only, this
                     waiver is voluntary and may be terminated at any time in
                     SEI Management's sole discretion.
 
                           For the fiscal year ended June 30, 1997, the Treasury
                     Securities, Government Securities, Prime Obligation, and
                     Institutional Cash Portfolios paid management fees, after
                     waivers, of .37%, .39%, .37% and .36%, respectively, of
                     their average daily net assets. As of June 30, 1997, the
                     Money Market Portfolio had not commenced operations.
THE ADVISER
         _______________________________________________________________________
 
                     Wellington Management Company, LLP (the "Adviser"), 75
                     State Street, Boston, Massachusetts 02109, serves as the
                     investment adviser to each Portfolio. The Adviser, under an
                     investment advisory agreement with the Trust, invests the
                     assets of the Portfolios and continuously reviews,
                     supervises and administers each Portfolio's investment
                     program, subject to the supervision of, and policies
                     established by, the Trustees of the Trust.
 
                           As of September 30, 1997, the Adviser had investment
                     management authority with respect to approximately $168.7
                     billion of assets, including the assets of the Trust and
                     SEI Daily Income Trust, which is an open-end management
                     investment company administered by the Manager. The Adviser
                     is a professional investment counseling firm which provides
                     investment services to investment companies, employee
                     benefit plans, endowments, foundations, and other
                     institutions and individuals. The Adviser's predecessor
                     organizations have provided investment advisory services to
                     investment companies since 1933, and to investment
                     counseling clients since 1960. The Adviser is a
                     Massachusetts limited liability partnership, of which the
                     following persons are managing partners: Robert W. Doran,
                     Duncan M. McFarland and John R. Ryan.
 
                           The Adviser is entitled to a fee, which is calculated
                     daily and paid monthly, at an annual rate of .075% of the
                     combined average daily net assets of the Trust's Portfolios
                     up to $500 million, and .02% of such average daily net
                     assets in excess of $500 million. Such fees are allocated
                     daily among the Portfolios of the Trust on the basis of
                     their relative net assets. For the fiscal year ended June
                     30, 1997, the Treasury Securities, Government Securities,
                     Prime Obligation, and Institutional Cash Portfolios paid
                     advisory fees, after fee waivers, of .04%, .04%, .04%, and
                     .00%, respectively, of their relative net assets. As of
                     June 30, 1997, the Money Market Portfolio had not commenced
                     operations.
 
                                                                               9
<PAGE>
DISTRIBUTION AND
SHAREHOLDER
SERVICING
      __________________________________________________________________________
 
                     SEI Investments Distribution Co. (the "Distributor"), a
                     wholly-owned subsidiary of SEI Investments Company ("SEI"),
                     serves as each Portfolio's distributor pursuant to a
                     distribution agreement with the Trust. The Portfolios have
                     adopted a shareholder service plan for their Class A shares
                     (the "Class A Plan").
 
                           The Portfolios have adopted a shareholder service
                     plan for Class A shares (the "Class A Service Plan") under
                     which firms, including the Distributor, that provide
                     shareholder and administrative services may receive
                     compensation therefor. Under the Class A Service Plan, the
                     Distributor may provide those services itself, or may enter
                     into arrangements under which third parties provide such
                     services and are compensated by the Distributor. Under such
                     arrangements, the Distributor may retain as profit any
                     difference between the fee it receives and the amount it
                     pays such third parties. In addition, the Portfolios may
                     enter into such arrangements directly. Under the Class A
                     Service Plan, the Distributor is entitled to receive a fee
                     at a negotiated annual rate of up to .25% of each
                     Portfolio's average daily net assets attributable to Class
                     A shares that are subject to the arrangement in return for
                     provision of a broad range of shareholder and
                     administrative services, including: maintaining client
                     accounts; arranging for bank wires; responding to client
                     inquiries concerning services provided for investments;
                     changing dividend options; account designations and
                     addresses; providing sub-accounting; providing information
                     on share positions to clients; forwarding shareholder
                     communications to clients; processing purchase, exchange
                     and redemption orders; and processing dividend payments.
 
                           In addition, the Treasury Securities Portfolio has
                     adopted a distribution plan for its Class D shares (the
                     "Class D Plan") pursuant to Rule 12b-1 under the Investment
                     Company Act of 1940, as amended (the "1940 Act").
 
                           It is possible that an institution may offer
                     different classes of shares to its customers and thus
                     receive different compensation with respect to different
                     classes. These financial institutions may also charge
                     separate fees to their customers.
 
                           The Trust may also execute brokerage or other agency
                     transactions through the Distributor for which the
                     Distributor may receive usual and customary compensation.
 
                           The Distributor may, from time to time and at its own
                     expense, provide promotional incentives, in the form of
                     cash or other compensation, to certain financial
                     institutions whose representatives have sold or are
                     expected to sell significant amounts of the Portfolios'
                     shares.
 
                                                                              10
<PAGE>
PURCHASE AND
REDEMPTION OF SHARES
    ____________________________________________________________________________
 
                     Financial institutions may acquire Class A shares of the
                     Portfolios for their own account, or as a record owner on
                     behalf of fiduciary, agency or custody accounts, by placing
                     orders with the Transfer Agent. Institutions that use
                     certain SEI proprietary systems may place orders
                     electronically through those systems. Financial
                     institutions may impose an earlier cut-off time for receipt
                     of purchase orders directed through them to allow time for
                     processing and transmittal of these orders to the Transfer
                     Agent for effectiveness on the same day. Financial
                     institutions which purchase shares for the accounts of
                     their customers may impose separate charges on these
                     customers for account services.
 
                           Shares of each Portfolio may be purchased or redeemed
                     on days on which the New York Stock Exchange is open for
                     business ("Business Days"). However, money market fund
                     shares cannot be purchased by Federal Reserve wire on
                     Federal holidays on which wire transfers are restricted.
 
                           Shareholders who desire to purchase shares must place
                     their orders with the Transfer Agent (or its authorized
                     agent) prior to the determination of net asset value and in
                     accordance with the procedures described below for the
                     order to be accepted on that Business Day. Cash investments
                     must be transmitted or delivered in federal funds to the
                     wire agent by the close of business on the same day the
                     order is placed. The Trust reserves the right to reject a
                     purchase order when the Distributor determines that it is
                     not in the best interest of the Trust or shareholders to
                     accept such purchase order.
 
                           The Trust will send shareholders a statement after
                     each purchase or redemption transaction. The purchase price
                     of shares is the net asset value next determined after a
                     purchase order is received and accepted by the Trust, which
                     is expected to remain constant at $1.00. The net asset
                     value per share of each Portfolio is determined by dividing
                     the total market value of the Portfolio's investments and
                     other assets, less any liabilities, by the total number of
                     outstanding shares of that Portfolio. Net asset value per
                     share is determined daily as of 2:00 p.m., Eastern time
                     (12:00 p.m., Eastern time, for the Institutional Cash
                     Portfolio), on each Business Day. Financial institutions
                     which purchase and redeem shares for the accounts of their
                     customers may impose their own cut-off times for receipt of
                     purchase and redemption requests directed through them.
 
                           Shareholders who desire to redeem shares of a
                     Portfolio must place their redemption orders with the
                     Transfer Agent (or its authorized agent) prior to the
                     determination of net asset value and in accordance with the
                     procedures described below on any Business Day. The
                     redemption price is the net asset value per share of the
                     Portfolio next determined after receipt by the Transfer
                     Agent of the redemption order. Payment on redemptions will
                     be made as promptly as possible and, in any event, within
                     seven days after the redemption order is received.
 
                                                                              11
<PAGE>
                           Purchase and redemption orders may be placed by
                     telephone. Neither the Trust nor the Trust's Transfer Agent
                     will be responsible for any loss, liability, cost or
                     expense for acting upon wire instructions or upon telephone
                     instructions that it reasonably believes to be genuine. The
                     Trust and the Trust's Transfer Agent will each employ
                     reasonable procedures to confirm that instructions
                     communicated by telephone are genuine, including requiring
                     a form of personal identification prior to acting upon
                     instructions received by telephone and recording telephone
                     instructions.
 
                           If market conditions are extraordinarily active, or
                     other extraordinary circumstances exist, shareholders may
                     experience difficulties placing redemption orders by
                     telephone, and may wish to consider placing orders by other
                     means.
PERFORMANCE
          ______________________________________________________________________
 
                     From time to time, the Portfolios may advertise "current
                     yield" and "effective compound yield." These figures will
                     fluctuate, as they are based on historical earnings and are
                     not intended to indicate future performance. The "current
                     yield" of the Portfolios refers to the income generated by
                     an investment over a seven-day period which is then
                     "annualized." That is, the amount of income generated by an
                     investment during that week is assumed to be generated each
                     week over a 52-week period, and is shown as a percentage of
                     the investment. The "effective yield" is calculated
                     similarly but, when annualized, the income earned by an
                     investment is assumed to be reinvested. The "effective
                     yield" will be slightly higher than the "current yield"
                     because of the compounding effect of this assumed
                     reinvestment.
 
                           A Portfolio may periodically compare its performance
                     to that of: (i) other mutual funds tracked by mutual fund
                     rating services (such as Lipper Analytical), financial and
                     business publications and periodicals; (ii) broad groups of
                     comparable mutual funds; (iii) unmanaged indices which may
                     assume investment of dividends but generally do not reflect
                     deductions for administrative and management costs; or (iv)
                     other investment alternatives.
 
                           The performance of the Class A shares will normally
                     be higher than the performance of the Class D shares of a
                     Portfolio because of additional distribution and transfer
                     agent expenses charged to Class D shares.
TAXES
  ______________________________________________________________________________
 
                     The following summary of federal income tax consequences is
                     based on current tax laws and regulations, which may be
                     changed by legislative, judicial or administrative action.
                     No attempt has been made to present a detailed explanation
                     of the federal, state, or local income tax treatment of the
                     Portfolios or their shareholders. In addition, state and
                     local tax consequences of an investment in a Portfolio may
                     differ from the federal income tax consequences described
                     below. Accordingly, shareholders are urged to consult their
                     tax advisers regarding specific questions as to federal,
                     state and local income taxes. Additional information
                     concerning taxes is set forth in the Statement of
                     Additional Information.
 
                                                                              12
<PAGE>
TAX STATUS OF THE
PORTFOLIOS
                     Each Portfolio is treated as a separate entity for federal
                     tax purposes and is not combined with the Trust's other
                     Portfolios. Each Portfolio intends to qualify for the
                     special tax treatment afforded regulated investment
                     companies under Subchapter M of the Internal Revenue Code
                     of 1986, as amended, so as to be relieved of federal income
                     tax on net investment company taxable income and net
                     capital gains (the excess of net long-term capital gain
                     over net short-term capital losses) distributed to
                     shareholders.
TAX STATUS OF
DISTRIBUTIONS
                     Each Portfolio distributes substantially all of its net
                     investment income (including net short-term capital gains)
                     to shareholders. Dividends from a Portfolio's net
                     investment income are taxable to its shareholders as
                     ordinary income (whether received in cash or in additional
                     shares). Distributions of net capital gains are taxable to
                     shareholders as gain from the sale or exchange of a capital
                     asset held for more than one year regardless of how long
                     shareholders have held their shares and regardless of
                     whether the distributions are received in cash or in
                     additional shares. Dividends and distributions of capital
                     gains paid by each Portfolio do not qualify for the
                     dividends-received deduction for corporate shareholders.
                     Each Portfolio will provide annual reports to shareholders
                     of the federal income tax status of all distributions.
 
                           Dividends declared by a Portfolio in October,
                     November or December of any year and payable to
                     shareholders of record on a date in such a month will be
                     deemed to have been paid by the Portfolio and received by
                     the shareholders on December 31 of the year declared if
                     paid by the Portfolio at any time during the following
                     January.
 
                           Each Portfolio intends to make sufficient
                     distributions prior to the end of each calendar year to
                     avoid liability for the federal excise tax applicable to
                     regulated investment companies.
 
                           With respect to investments in U.S. Treasury STRIPS,
                     which are sold at original issue discount and thus do not
                     make periodic cash interest payments, each Portfolio will
                     be required to include as part of its current income, the
                     imputed interest on such obligations even though the
                     Portfolio has not received any interest payments on such
                     obligations during that period. Because each Portfolio
                     distributes all of its net investment income to its
                     shareholders, a Portfolio may have to sell portfolio
                     securities in order to distribute such imputed income,
                     which may occur at a time when the Adviser would not have
                     chosen to sell such securities and, which may result in a
                     taxable gain or loss.
 
                           Investment income received by the Portfolios on
                     direct U.S. Government obligations is exempt from tax at
                     the state level when received directly by a Portfolio, and
                     may be exempt, depending on the state, when received by a
                     shareholder as income dividends from any Portfolio provided
                     certain state-specific conditions are satisfied. Interest
                     received on repurchase agreements collateralized by U.S.
                     Government obligations normally is not exempt from state
                     taxation. Each Portfolio will inform shareholders annually
                     of the percentage of income and distributions derived from
                     direct U.S. Government obligations. Shareholders should
                     consult their tax advisers to determine whether any portion
                     of the income dividends received from a Portfolio is
                     considered tax exempt in their particular states.
 
                                                                              13
<PAGE>
                           Each sale, exchange, or redemption of any Portfolio's
                     shares is a taxable transaction to the shareholder.
 
GENERAL INFORMATION
         _______________________________________________________________________
THE TRUST
                     SEI Liquid Asset Trust (the "Trust") was organized as a
                     Massachusetts business trust under a Declaration of Trust
                     dated July 20, 1981. The Declaration of Trust permits the
                     Trust to offer separate Portfolios of shares and different
                     classes of each Portfolio. All consideration received by
                     the Trust for shares of any portfolio and all assets of
                     such portfolio belong to that portfolio or class and are
                     subject to liabilities related thereto.
 
                           The Trust pays its expenses, including fees of its
                     service providers, audit and legal expenses, expenses of
                     preparing prospectuses, proxy solicitation material and
                     reports to shareholders, costs of custodial services and
                     registering the shares under federal and state securities
                     laws, pricing, insurance expenses, litigation and other
                     extraordinary expenses, brokerage costs, interest charges,
                     taxes and organization expenses.
TRUSTEES OF THE TRUST
                     The management and affairs of the Trust are supervised by
                     the Trustees under the laws of the Commonwealth of
                     Massachusetts. The Trustees have approved contracts under
                     which, as described above, certain companies provide
                     essential management services to the Trust.
VOTING RIGHTS
                     Each share held entitles the shareholder of record to one
                     vote. The shareholders of each Portfolio or class of the
                     Trust will vote separately on matters relating solely to
                     that Portfolio or class. As a Massachusetts business trust,
                     the Trust is not required to hold annual meetings of
                     shareholders, but approval will be sought for certain
                     changes in the operation of the Trust and for the election
                     of Trustees under certain circumstances. In addition, a
                     Trustee may be removed by the remaining Trustees or by
                     shareholders at a special meeting called upon written
                     request of shareholders owning at least 10% of the
                     outstanding shares of the Trust. In the event that such a
                     meeting is requested, the Trust will provide appropriate
                     assistance and information to the shareholders requesting
                     the meeting.
REPORTING
                     The Trust issues unaudited financial statements
                     semi-annually and audited financial statements annually.
                     The Trust furnishes proxy statements and other reports to
                     shareholders of record.
SHAREHOLDER INQUIRIES
                     Shareholder inquiries should be directed to the Manager,
                     SEI Fund Management, Oaks, Pennsylvania 19456.
DIVIDENDS
                     Substantially all of the net investment income (exclusive
                     of capital gains) of each Portfolio is periodically
                     declared and paid as a dividend. Dividends are paid by the
                     Portfolio in federal funds or in additional shares at the
                     discretion of the shareholder on the first Business Day of
                     each month. Dividends will be paid on the next Business Day
                     to shareholders who redeem all of their shares of a
                     Portfolio at any other time during the month. Currently,
                     capital gains (the excess of net long-term capital gain
                     over net short-term capital loss) realized, if any, are
                     distributed at least annually.
 
                                                                              14
<PAGE>
COUNSEL AND INDEPENDENT
ACCOUNTANTS
                     Morgan, Lewis & Bockius LLP serves as counsel to the Trust.
                     Price Waterhouse LLP serves as the independent accountants
                     to the Trust.
CUSTODIAN AND WIRE AGENT
                     CoreStates Bank, N.A., Broad and Chestnut Streets, P.O. Box
                     7618, Philadelphia, Pennsylvania 19101 (the "Custodian"),
                     serves as custodian of the Trust's assets and as wire agent
                     of the Trust. The Custodian holds cash, securities and
                     other assets of the Trust as required by the 1940 Act.
 
DESCRIPTION OF
PERMITTED
INVESTMENTS AND RISK
FACTORS   ______________________________________________________________________
 
                     The following is a description of certain of the permitted
                     investments for the Portfolios, and the associated risk
                     factors:
BANK NOTES
                     Bank notes are notes used to represent debt obligations
                     issued by banks in large denominations.
BANKERS' ACCEPTANCE
                     A bankers' acceptance is a bill of exchange or time drafts
                     drawn on and accepted by a commercial bank. Bankers'
                     acceptances are used by corporations to finance the
                     shipment and storage of goods. Maturities are generally six
                     months or less.
CERTIFICATES OF DEPOSIT
                     Certificates of deposit are interest-bearing instruments
                     with a specific maturity. They are issued by banks and
                     savings and loan institutions in exchange for the deposit
                     of funds, and normally can be traded in the secondary
                     market prior to maturity. Certificates of deposit with
                     penalties for early withdrawal will be considered illiquid.
COMMERCIAL PAPER
                     Commercial paper is the term used to designate unsecured
                     short-term promissory notes issued by municipalities,
                     corporations and other entities. Maturities on these issues
                     vary from one to 270 days.
DEMAND INSTRUMENTS
                     Certain instruments may entail a demand feature which
                     permits the holder to demand payment of the principal
                     amount of the instrument. Demand instruments may include
                     variable amount master demand notes.
FOREIGN SECURITIES
                     The Money Market Portfolio may invest in U.S. dollar
                     denominated obligations, including (i) commercial paper of
                     issuers domiciled outside of the United States ("Yankees"),
                     (ii) securities issued by foreign branches of U.S.
                     commercial banks and of U.S. and London branches of foreign
                     banks, and (iii) obligations and securities of foreign
                     governments, including Canadian and Provincial Government
                     and Crown Agency obligations. The Adviser will attempt to
                     minimize the risks associated with investing in foreign
                     obligations by investing only in those instruments which
                     satisfy the quality and maturity restrictions applicable to
                     the Portfolio.
ILLIQUID SECURITIES
                     Illiquid securities are securities which cannot be disposed
                     of within seven business days at approximately the price at
                     which they are being carried on a Portfolio's books.
                     Illiquid
 
                                                                              15
<PAGE>
                     securities may include demand instruments with demand
                     notice periods exceeding seven days, securities for which
                     there is no active secondary market, and repurchase
                     agreements with maturities or durations of more than seven
                     days in length.
REPURCHASE AGREEMENTS
                     Repurchase agreements are agreements by which a Portfolio
                     obtains a security and simultaneously commits to return the
                     security to the seller at an agreed upon price on an agreed
                     upon date within a number of days from the date of
                     purchase. The Portfolio will have actual or constructive
                     possession of the securities held as collateral for the
                     repurchase agreement. A Portfolio bears a risk of loss in
                     the event the other party defaults on its obligations and
                     the Portfolio is delayed or prevented from exercising its
                     right to dispose of the collateral securities or if the
                     Portfolio realizes a loss on the sale of the collateral. A
                     Portfolio will enter into repurchase agreements only with
                     financial institutions deemed to present minimal risk of
                     bankruptcy during the term of the agreement based on
                     established guidelines. Repurchase agreements are
                     considered loans under the 1940 Act.
RESTRICTED SECURITIES
                     Restricted securities are securities that may not be sold
                     freely to the public absent registration under the
                     Securities Act of 1933 or an exemption from registration.
                     Rule 144A securities are securities that have not been
                     registered under the Securities Act of 1933, but which may
                     be traded between certain institutional investors,
                     including investment companies. The Trust's Board of
                     Trustees is responsible for developing guidelines and
                     procedures for determining the liquidity of restricted
                     securities and monitoring the Adviser's implementation of
                     the guidelines and procedures.
TAXABLE MUNICIPAL
SECURITIES
                     Taxable Municipal Securities are Municipal Securities the
                     interest on which is not exempt from federal income tax.
                     Taxable Municipal Securities include "private activity
                     bonds" that are issued by or on behalf of states or
                     political subdivisions thereof to finance privately-owned
                     or operated facilities for business and manufacturing,
                     housing, sports, and pollution control and to finance
                     activities of and facilities for charitable institutions.
                     Private activity bonds are also used to finance public
                     facilities such as airports, mass transit systems, ports,
                     parking lots, and low income housing. The payment of the
                     principal and interest on private activity bonds is not
                     backed by a pledge of tax revenues, and is dependent solely
                     on the ability of the facility's user to meet its financial
                     obligations, and may be secured by a pledge of real and
                     personal property so financed. Interest on these bonds may
                     not be exempt from federal income tax.
TIME DEPOSITS
                     Time deposits are non-negotiable receipts issued by a bank
                     in exchange for the deposit of funds. Like a certificate of
                     deposit, it earns a specified rate of interest over a
                     definite period of time; however, it cannot be traded in
                     the secondary market. Time deposits with maturities of more
                     than seven days are considered to be illiquid.
U.S. GOVERNMENT AGENCY
OBLIGATIONS
                     Certain federal agencies, such as the Government National
                     Mortgage Association ("GNMA"), have been established as
                     instrumentalities of the U.S. Government to supervise and
                     finance certain types of activities. Issues of these
                     agencies, while not direct obligations
 
                                                                              16
<PAGE>
                     of the U.S. Government, are either backed by the full faith
                     and credit of the United States (such as GNMA securities)
                     or supported by the issuing agency's right to borrow from
                     the Treasury. The issues of other agencies are supported
                     only by the credit of the instrumentality (such as Fannie
                     Mae securities). Any guarantee by the U.S. Government
                     agencies or instrumentalities of all securities in which a
                     Portfolio invests guarantees only the payment of principal
                     and interest on the guaranteed security and does not
                     guarantee the yield or value of the security or the yield
                     or value of shares of that Portfolio.
U.S. TREASURY
OBLIGATIONS
                     U.S. Treasury obligations consist of bills, notes and bonds
                     issued by the U.S. Treasury, as well as separately traded
                     interest and principal component parts of such obligations,
                     known as Separately Traded Registered Interest and
                     Principal Securities ("STRIPS"), that are transferable
                     through the federal book-entry system.
 
                           STRIPS are sold as zero coupon securities, which
                     means that they are sold at a substantial discount and
                     redeemed at face value at their maturity date without
                     interim payments of interest or principal. This discount is
                     accreted over the life of the security, and such accretion
                     will constitute the income earned on the security for both
                     accounting and tax purposes. Because of these features,
                     such securities may be subject to greater interest rate
                     volatility than interest-paying investments.
VARIABLE AND FLOATING
RATE INSTRUMENTS
                     Certain of the obligations purchased by a Portfolio may
                     carry variable or floating rates of interest and may
                     involve a conditional or unconditional demand feature. Such
                     obligations may include variable amount master demand
                     notes. Such instruments bear interest at rates which are
                     not fixed, but which vary with changes in specified market
                     rates or indices. The interest rates on these securities
                     may be reset daily, weekly, quarterly or at some other
                     interval, and may have a floor or ceiling on interest rate
                     changes. There is a risk that the current interest rate on
                     such obligations may not accurately reflect existing market
                     interest rates. A demand instrument with a demand notice
                     period exceeding seven days may be considered illiquid if
                     there is no secondary market for such security.
WHEN-ISSUED AND DELAYED
DELIVERY SECURITIES
                     When-issued or delayed delivery transactions involve the
                     purchase of an instrument with payment and delivery taking
                     place in the future. Delivery of and payment for these
                     securities may occur a month or more after the date of the
                     purchase commitment. A Portfolio will maintain with the
                     custodian a separate account with liquid securities or cash
                     in an amount at least equal to these commitments. The
                     interest rate realized on these securities is fixed as of
                     the purchase date, and no interest accrues to a Portfolio
                     before settlement.
 
                                                                              17
<PAGE>
TABLE OF CONTENTS
               _________________________________________________________________
 
<TABLE>
<S>                                                                         <C>
Annual Operating Expenses.................................................     2
Financial Highlights......................................................     3
The Trust.................................................................     5
Investment Objectives and Policies........................................     5
General Investment Policies...............................................     7
Investment Limitations....................................................     8
The Manager...............................................................     8
The Adviser...............................................................     9
Distribution and Shareholder Servicing....................................    10
Purchase and Redemption of Shares.........................................    11
Performance...............................................................    12
Taxes.....................................................................    12
General Information.......................................................    14
Description of Permitted Investments and Risk Factors.....................    15
</TABLE>
 
                                                                              18
<PAGE>
                             SEI LIQUID ASSET TRUST
 
Manager:
 
  SEI Fund Management
 
Distributor:
 
  SEI Investments Distribution Co.
 
Investment Adviser:
 
  Wellington Management Company, LLP
 
    This STATEMENT OF ADDITIONAL INFORMATION is not a Prospectus. It is intended
to provide additional information regarding the activities and operations of SEI
Liquid Asset Trust (the "Trust"), and should be read in conjunction with the
Trust's Class A and Class D Prospectuses, each of which is dated October 30,
1997. Prospectuses may be obtained upon request and without charge by writing
the Trust's distributor, SEI Investments Distribution Co., Oaks, Pennsylvania
19456, or by calling 1-800-342-5734.
 
                               TABLE OF CONTENTS
 
<TABLE>
<S>                                                                         <C>
The Trust.................................................................   S-2
Description of Permitted Investments......................................   S-2
The Manager...............................................................   S-6
The Adviser...............................................................   S-8
Distribution and Shareholder Servicing....................................   S-8
Trustees and Officers of the Trust........................................   S-9
Fundamental Investment Limitations........................................  S-11
Non-Fundamental Investment Limitations....................................  S-13
Performance...............................................................  S-13
Determination of Net Asset Value..........................................  S-14
Purchase and Redemption of Shares.........................................  S-15
Shareholder Services (Class D Shares).....................................  S-15
Taxes.....................................................................  S-16
Portfolio Transactions....................................................  S-18
Description of Shares.....................................................  S-18
Limitation of Trustees' Liability.........................................  S-19
Shareholder Liability.....................................................  S-19
5% Shareholders...........................................................  S-19
Financial Information.....................................................  S-20
</TABLE>
 
October 30, 1997
 
SEI-F-004-08
<PAGE>
                                   THE TRUST
 
    SEI Liquid Asset Trust (the "Trust") is a diversified, open-end management
investment company established as a Massachusetts business trust pursuant to a
Declaration of Trust dated July 20, 1981. The Declaration of Trust permits the
Trust to offer separate series ("portfolios") of units of beneficial interest
("shares") and separate classes of portfolios. Except for differences between
Class A and Class D shares pertaining to distribution and shareholder servicing
plans, voting rights, dividends and transfer agent expenses, each share of each
portfolio represents an equal proportionate interest in that portfolio with each
other share of that portfolio.
 
    This Statement of Additional Information relates to the shares of the
following Portfolios: Treasury Securities, Government Securities, Prime
Obligation, Institutional Cash and Money Market Portfolios (each a "Portfolio"
and, together, the "Portfolios"), and any classes of the Portfolios.
 
                      DESCRIPTION OF PERMITTED INVESTMENTS
 
    COMMERCIAL PAPER--The Prime Obligation and Money Market Portfolios may
invest in commercial paper. Commercial paper is the term used to designate
unsecured, short-term promissory notes issued by corporations and other
entities.
 
    COMMERCIAL PAPER RATINGS--The following descriptions of commercial paper
ratings have been published by Standard & Poor's Corporation ("S&P"), Moody's
Investors Service, Inc. ("Moody's"), Fitch Investors Service, Inc. ("Fitch"),
Duff & Phelps, Inc. ("Duff"), Thomson BankWatch ("Thomson") and IBCA Limited and
IBCA, Inc. (together, "IBCA").
 
    Commercial paper rated A by S&P is regarded by S&P as having the greatest
capacity for timely payment. Issues rated A are further refined by use of the
numbers 1+, 1 and 2 to indicate the relative degree of safety. Issues rated A-1+
are those with an "overwhelming degree" of credit protection. Those rated A-1,
the highest rating category, reflect a "very strong" degree of safety regarding
timely payment. Those rated A-2, the second highest rating category, reflect a
safety regarding timely payment, but not as high as A-1.
 
    Moody's employs two designations, judged to be high grade commercial paper,
to indicate the relative repayment capacity of rated issuers as follows:
 
     Prime-1  Superior Quality
     Prime-2  Strong Quality
 
    The rating Fitch-1 (Highest Grade) is the highest commercial paper rating
assigned by Fitch. Paper rated Fitch-1 is regarded as having the strongest
degree of assurance for timely payment. The rating Fitch-2 (Very Good Grade) is
the second highest commercial paper rating assigned by Fitch which reflects an
assurance of timely payment only slightly lower in degree than the strongest
issues.
 
    The rating Duff-1 is the highest commercial paper rating assigned by Duff.
Paper rated Duff-1 is regarded as having very high certainty of timely payment
with excellent liquidity factors which are supported by ample asset protection.
Risk factors are minor. Paper rated Duff-2, the second highest rating category,
is regarded as having good certainty of timely payment, good access to capital
markets and sound liquidity factors and company fundamentals. Risk factors are
small.
 
    The rating TBW-1 is the highest commercial paper rating assigned by Thomson.
Paper rated TBW-1 indicates a very high likelihood that principal and interest
will be paid on a timely basis. The rating TBW-2 is the second-highest rating
assigned category by Thomson. The relative degree of safety regarding timely
repayment of principal and interest is strong. However, the relative degree of
safety is not as high as for issues rated TBW-1.
 
    The designation A1, the highest rating category established by IBCA,
indicates that the obligation is supported by a very strong capacity for timely
repayment. Those obligations rated A1+ are supported by
 
                                      S-2
<PAGE>
the highest capacity for timely repayment. Obligations rated A2, the second
highest rating category, are supported by a strong capacity for timely
repayment, although such capacity may be susceptible to adverse changes in
business, economic or financial conditions.
 
    FOREIGN SECURITIES--The Money Market Portfolio may invest in U.S. dollar
denominated obligations of foreign issuers, including foreign branches of U.S.
commercial banks, and of U.S. and London branches of foreign banks. These
instruments may subject the Portfolio to investment risks that differ in some
respects from those related to investments in obligations of U.S. domestic
issuers. Such risks include future adverse political and economic developments,
the possible imposition of withholding taxes on interest or other income,
possible seizure, nationalization, or expropriation of foreign deposits, the
possible establishment of exchange controls or taxation at the source, greater
fluctuations in value due to changes in exchange rates, or the adoption of other
foreign governmental restrictions which might adversely affect the payment of
principal and interest on such obligations. Such investments may also entail
higher custodial fees and sales commissions than domestic investments. Foreign
issuers of securities or obligations are often subject to accounting treatment
and engage in business practices different from those respecting domestic
issuers of similar securities or obligations. Foreign branches of U.S. banks and
foreign banks may be subject to less stringent reserve requirements than those
applicable to domestic branches of U.S. banks.
 
    GNMA SECURITIES--The Prime Obligation, Money Market and Government
Securities Portfolios may invest in securities issued by the Government National
Mortgage Association ("GNMA"), a wholly-owned U.S. Government corporation which
guarantees the timely payment of principal and interest. However, any premiums
paid to purchase these instruments are not subject to GNMA guarantees. The
market value and interest yield of these instruments can vary due to market
interest rate fluctuations and early prepayments of underlying mortgages.
 
    These securities represent ownership in a pool of Federally insured mortgage
loans. GNMA certificates consist of underlying mortgages with a maximum maturity
of 30 years. However, due to scheduled and unscheduled principal payments, GNMA
certificates have a shorter average maturity and, therefore, less principal
volatility than a comparable 30-year mortgage-backed bond. Since prepayment
rates vary widely, it is not possible to accurately predict the average maturity
of a particular GNMA pool. The scheduled monthly interest and principal payments
relating to mortgages in the pool will be "passed through" to investors. GNMA
securities differ from conventional bonds in that principal is paid back to the
certificate holders over the life of the loan rather than at maturity. As a
result, the Portfolios will receive monthly scheduled payments of principal and
interest. In addition, the Portfolios may receive unscheduled principal payments
representing prepayments on the underlying mortgages. Any prepayments will be
reinvested at the then-prevailing interest rate.
 
    Although GNMA certificates may offer yields higher than those available from
other types of U.S. Government Securities, GNMA certificates may be less
effective than other types of securities as a means of "locking in" attractive
long-term rates because of the prepayment feature. Due to this prepayment
feature, GNMA certificates tend not to increase in value as much as most other
debt securities when interest rates decline.
 
    MUNICIPAL SECURITIES--The Money Market and Prime Obligation Portfolios may
invest in Municipal Securities. The two principal classifications of Municipal
Securities are "general obligation" and "revenue" issues. General obligation
issues are issues involving the credit of an issuer possessing taxing power and
are payable from the issuer's general unrestricted revenues, although the
characteristics and method of enforcement of general obligation issues may vary
according to the law applicable to the particular issuer. Revenue issues are
payable only from the revenues derived from a particular facility or class of
facilities or other specific revenue source. A Portfolio may also invest in
"moral obligation" issues, which are normally issued by special purpose
authorities. Moral obligation issues are not backed by the full faith and credit
of the state but are generally backed by the agreement of the issuing authority
to request appropriations from the state legislative body. Municipal Securities
include debt obligations issued by
 
                                      S-3
<PAGE>
governmental entities to obtain funds for various public purposes, such as the
construction of a wide range of public facilities, the refunding of outstanding
obligations, the payment of general operating expenses, and the extension of
loans to other public institutions and facilities. Certain private activity
bonds that are issued by or on behalf of public authorities to finance various
privately-owned or operated facilities are included within the term "Municipal
Securities." Private activity bonds and industrial development bonds are
generally revenue bonds, the credit and quality of which are directly related to
the credit of the private user of the facilities.
 
    Municipal Securities may also include general obligation notes, tax
anticipation notes, bond anticipation notes, revenue anticipation notes, project
notes, certificates of indebtedness, demand notes, tax-exempt commercial paper,
construction loan notes and other forms of short-term, tax-exempt loans. Such
instruments are issued with a short-term maturity in anticipation of the receipt
of tax funds, the proceeds of bond placements or other revenues. Project notes
are issued by a state or local housing agency and are sold by the Department of
Housing and Urban Development. While the issuing agency has the primary
obligation with respect to its project notes, they are also secured by the full
faith and credit of the United States through agreements with the issuing
authority which provide that, if required, the federal government will lend the
issuer an amount equal to the principal of and interest on the project notes.
 
    The quality of Municipal Securities, both within a particular classification
and between classifications, will vary, and the yields on Municipal Securities
depend upon a variety of factors, including general money market conditions, the
financial condition of the issuer (or other entity whose financial resources are
supporting the securities), general conditions of the municipal bond market, the
size of a particular offering, the maturity of the obligation and the rating(s)
of the issue. In this regard, it should be emphasized that the ratings of any
nationally recognized statistical rating organization ("NRSRO") are general and
are not absolute standards of quality. Municipal Securities with the same
maturity, interest rate and rating(s) may have different yields, while Municipal
Securities of the same maturity and interest rate with different rating(s) may
have the same yield.
 
    An issuer's obligations under its Municipal Securities are subject to the
provisions of bankruptcy, insolvency, and other laws affecting the rights and
remedies of creditors, such as the Federal Bankruptcy Code, and laws, if any,
which may be enacted by Congress or state legislatures extending the time for
payment of principal or interest, or both, or imposing other constraints upon
the enforcement of such obligations or upon the ability of municipalities to
levy taxes. The power or ability of an issuer to meet its obligations for the
payment of interest on and principal of its Municipal Securities may be
materially adversely affected by litigation or other conditions.
 
    MUNICIPAL AND CORPORATE BOND RATINGS--Bonds rated AAA have the highest
rating S&P assigns to a debt obligation. Such a rating indicates an extremely
strong capacity to pay principal and interest. Bonds rate AA also qualify as
high-quality debt obligations. Capacity to pay principal and interest is very
strong, and in the majority of instances, they differ from AAA issues only in
small degree.
 
    Bonds which are rated Aaa by Moody's are judged to be the best quality. They
carry the smallest degree of credit risk and are generally referred to as "gilt
edge." Interest payments are protected by a large, or an exceptionally stable,
margin, and principal is secure. While the various protective elements are
likely to change, such changes as can be visualized are most unlikely to impair
the fundamentally strong position of such issues. Bonds rated Aa are judged by
Moody's to be of high quality by all standards. Together with bonds rated Aaa,
they comprise what are generally known as high-grade bonds. They are rated lower
than the best bonds because margins of protection may not be as large as in Aaa
securities or fluctuation of protective elements may be of greater amplitude or
there may be other elements present which make the long-term risks appear
somewhat larger than in Aaa securities.
 
    Bonds rated AAA are judged by Fitch to be strictly high grade, broadly
marketable, suitable for investment by trustees and fiduciary institutions
liable to but slight market fluctuation other than through changes in the money
rate. The prime feature of an AAA bond is a showing of earnings several times or
 
                                      S-4
<PAGE>
many times interest requirements, with such stability of applicable earnings
that safety is beyond reasonable question whatever changes occur in conditions.
Bonds rated AA are judged by Fitch to be of safety virtually beyond question and
are readily salable, whose merits are not unlike those of the AAA class, but
whose margin of safety is less strikingly broad. The issue may be the obligation
of a small company, strongly secured but influenced as to rating by the lesser
financial power of the enterprise and more local type market.
 
    Bonds rated Duff-1 are judged by Duff to be of the highest credit quality
with negligible risk factors; only slightly more than U.S. Treasury debt. Bonds
rated Duff-2, are judged by Duff to be of high credit quality with strong
protection factors. Risk is modest but may vary slightly from time to time
because of economic conditions.
 
    Bonds which are rated AAA are judged by Thomson to be of the highest
category. The ability to repay principal and interest on a timely basis is very
high. Bonds rated AA are judged by Thomson to be of a superior ability to repay
principal and interest on a timely basis, with limited incremental risk compared
to issues rated in the highest category.
 
    Obligations rated AAA by IBCA have the lowest expectation of investment
risk. Capacity for timely repayment of principal and interest is substantial,
such that adverse changes in business, economic or financial conditions are
unlikely to increase investment risk significantly. Obligations for which there
is a very low expectation of investment risk are rated AA by IBCA. Capacity for
timely repayment of principal and interest is substantial. Adverse changes in
business, economic or financial conditions may increase investment risk albeit
not very significantly.
 
    MUNICIPAL NOTE RATINGS--Moody's highest rating for state and municipal and
other short-term notes is MIG-1 and VMIG-1. Short-term Municipal Securities
rated MIG-1 or VMIG-1 are of the best quality and such securities have strong
protection afforded by established cash flows, superior liquidity support and/or
demonstrated access to the market for refinancing. Short-term Municipal
Securities rated MIG-2 and VMIG-2 are of high quality and their margins of
protection are ample, although not so large as in the preceding group.
 
    An S&P note rating reflects the liquidity concerns and market access risks
unique to notes. Notes due in three years or less will likely receive a note
rating. Notes maturing beyond three years will most likely receive a long-term
debt rating. The following criteria will be used in making that assessment.
 
    - Amortization schedule (the larger the final maturity relative to other
      maturities, the more likely it will be treated as a note).
 
    - Source of payment (the more dependent the issue is on the market for its
      refinancing, the more likely it will be treated as a note).
 
    Note rate symbols are as follows:
 
    SP-1.  Very strong or strong capacity to pay principal and interest. Those
issues determined to possess overwhelming safety characteristics will be given a
plus (+) designation.
 
    SP-2.  Satisfactory capacity to pay principal and interest.
 
    REPURCHASE AGREEMENTS--The Treasury Securities, Government Securities, Prime
Obligation, and Money Market Portfolios may enter into repurchase agreements,
which are agreements under which securities are acquired from a securities
dealer or bank subject to resale on an agreed upon date and at an agreed upon
price which includes principal and interest. The Portfolio involved bears a risk
of loss in the event that the other party to a repurchase agreement defaults on
its obligations and the Portfolio is delayed or prevented from exercising its
rights to dispose of the securities held as collateral. Wellington Management
Company, LLP (the "Adviser") enters into repurchase agreements only with
financial institutions which it deems to present minimal risk of bankruptcy
during the term of the agreement based on
 
                                      S-5
<PAGE>
guidelines established by and periodically reviewed by the Board of Trustees.
These guidelines currently permit the Portfolios to enter into repurchase
agreements only with approved banks and primary securities dealers, as
recognized by the Federal Reserve Bank of New York, which have minimum net
capital of $100 million, or with a member bank of the Federal Reserve System.
Repurchase agreements are considered to be loans collateralized by the
underlying security. Repurchase agreements entered into by the Portfolios will
provide that the underlying security at all times shall have a value at least
equal to 102% of the price stated in the agreement. This underlying security
will be marked to market daily. The Adviser monitors compliance with this
requirement. Under all repurchase agreements entered into by the Portfolios, the
Portfolios will take actual or constructive possession of the underlying
collateral. However, if the seller defaults, the Portfolios could realize a loss
on the sale of the underlying security to the extent the proceeds of the sale
are less than the resale price. In addition, even though the Bankruptcy Code
provides protection for most repurchase agreements, if the seller should be
involved in bankruptcy or insolvency proceedings, the Portfolios may incur delay
and costs in selling the security and may suffer a loss of principal and
interest if the Portfolios are treated as an unsecured creditor.
 
    U.S. GOVERNMENT AGENCY OBLIGATIONS--The Government Securities, Prime
Obligation, and Money Market Portfolios may invest in obligations of agencies of
the United States Government, which consist of obligations issued by, among
others, the Export Import Bank of the United States, Farmers Home
Administration, Federal Farm Credit Bank, Federal Housing Administration,
Government National Mortgage Association, Maritime Administration, Small
Business Administration, and The Tennessee Valley Authority. The Government
Securities, Prime Obligation, and Money Market Portfolios may purchase
securities guaranteed by the Government National Mortgage Association, which
represent participation in Veterans Administration and Federal Housing
Administration backed mortgage pools. Obligations of instrumentalities of the
United States Government include securities issued by, among others, Federal
Home Loan Banks, Federal Home Loan Mortgage Corporation, Federal Intermediate
Credit Banks, Federal Land Banks, Fannie Mae and the United States Postal
Service. Some of these securities are supported by the full faith and credit of
the United States Treasury (E.G., GNMA Securities), others are supported by the
right of the issuer to borrow from the Treasury, and still others are supported
only by the credit of the instrumentality (E.G., Fannie Mae Securities).
Guarantees of principal by agencies or instrumentalities of the U.S. Government
may be a guarantee of payment at the maturity of the obligation, so that in the
event of a default prior to maturity, there might not be a market, and thus no
means of realizing the value of the obligation prior to maturity. The Portfolios
do not intend to purchase securities issued by the World Bank, the
Inter-American Development Bank or the Asian Development Bank.
 
    VARIABLE OR FLOATING RATE INSTRUMENTS--Each Portfolio may invest in variable
or floating rate instruments, which may involve a demand feature and may include
variable amount master demand notes which may or may not be backed by bank
letters of credit. Variable or floating rate instruments bear interest at a rate
which varies with changes in market rates. The holder of an instrument with a
demand feature may tender the instrument back to the issuer at par prior to
maturity. A variable amount master demand note is issued pursuant to a written
agreement between the issuer and the holder, its amount may be increased by the
holder or decreased by the holder or issuer, it is payable on demand, and the
rate of interest varies based upon an agreed formula. The quality of the
underlying credit must, in the opinion of the Adviser, be equivalent to the
quality ratings applicable to permitted investments for each Portfolio. The
Adviser will monitor on an ongoing basis the earning power, cash flow, and
liquidity ratios of the issuers of such instruments and will similarly monitor
the ability of an issuer of a demand instrument to pay principal and interest on
demand.
 
                                  THE MANAGER
 
    The Management Agreement, provides that SEI Fund Management (the "Manager")
shall not be liable for any error of judgment or mistake of law or for any loss
suffered by the Trust in connection with the matters to which the Management
Agreement relates, except a loss resulting from willful misfeasance,
 
                                      S-6
<PAGE>
bad faith or gross negligence on the part of the Manager in the performance of
its duties or from reckless disregard of its duties and obligations thereunder.
 
    The Management Agreement, unless terminated sooner as provided therein,
shall remain in effect for two years after the date of the Agreement and shall
continue in effect for successive periods of one year if such continuance is
specifically approved at least annually (i) by the Trustees of the Trust and
(ii) by the vote of a majority of the Trustees of the Trust, who are not parties
to the Management Agreement or interested persons (as that term is defined in
the Investment Company Act of 1940, as amended (the "1940 Act")) of any such
party, cast in person at a Board of Trustees meeting called for the purpose of
voting on such approval. The Agreement may be terminated at any time and without
penalty by the Trustees of the Trust or by the Manager on not less than 30 days'
nor more than 60 days' written notice to the other party thereto. Any notice
under the Management Agreement shall be given in writing, addressed and
delivered, or mailed postpaid, to the other party at the designated mailing
address of such party.
 
    The Manager, a Delaware business trust, has its principal business offices
at Oaks, Pennsylvania 19456. SEI Investments Management Corporation ("SIMC"), a
wholly-owned subsidiary of SEI Investments Company ("SEI Investments"), is the
owner of all beneficial interest in the Manager. SEI Investments and its
subsidiaries and affiliates, including the Manager, are leading providers of
funds evaluation services, trust accounting systems, and brokerage and
information services to financial institutions, institutional investors, and
money managers. The Manager and its affiliates also serve as administrator or
sub-administrator to the following other mutual funds: The Achievement Funds
Trust, The Advisors' Inner Circle Fund, The Arbor Fund, ARK Funds, Bishop Street
Funds, Boston 1784 Funds-Registered Trademark-, CoreFunds, Inc., CrestFunds,
Inc., CUFUND, The Expedition Funds, FMB Funds, Inc., First American Funds, Inc.,
First American Investment Funds, Inc., First American Strategy Funds, Inc.,
HighMark Funds, Marquis Funds-Registered Trademark-, Monitor Funds, Morgan
Grenfell Investment Trust, The PBHG Funds, Inc., PBHG Insurance Series Fund,
Inc., The Pillar Funds, Profit Funds Investment Trust, Rembrandt
Funds-Registered Trademark-, Santa Barbara Group of Mutual Funds, Inc., SEI
Asset Allocation Trust, SEI Daily Income Trust, SEI Index Funds, SEI
Institutional Investments Trust, SEI Institutional Managed Trust, SEI
International Trust, SEI Tax Exempt Trust, STI Classic Funds, STI Classic
Variable Trust, and TIP Funds.
 
    The Manager has agreed contractually to waive its fee in order to limit
operating expenses of the Portfolios to not more than .44% of average net assets
of the Class A shares and .84% of average net assets of the Class D shares. As
to the Institutional Cash Portfolio only, this waiver is voluntary and may be
terminated at any time. Shareholders will be notified in advance if and when the
waiver is terminated. The Manager will not be required to bear expenses of any
Portfolio to an extent which would result in the Portfolio's inability to
qualify as a regulated investment company under provisions of the Internal
Revenue Code of 1986, as amended (the "Code"). The term "expenses" is defined in
such laws or regulations, and generally excludes brokerage commissions,
distribution expenses, taxes, interest, litigation and extraordinary expenses.
 
    For the fiscal years ended June 30, 1995, 1996 and 1997, the Portfolios paid
fees to the Manager as follows:
 
<TABLE>
<CAPTION>
                                                  MANAGEMENT FEES PAID                           MANAGEMENT FEES WAIVED
                                      ---------------------------------------------   ---------------------------------------------
                                          1995            1996            1997            1995            1996            1997
                                      -------------   -------------   -------------   -------------   -------------   -------------
<S>                                   <C>             <C>             <C>             <C>             <C>             <C>
Treasury Securities Portfolio.......  $   4,160,873   $   3,979,872   $   2,666,177   $   1,226,700   $     981,184   $     383,785
Prime Obligation Portfolio..........  $   3,352,356   $   2,773,884   $   3,030,793   $     884,036   $     786,431   $     418,795
Government Securities Portfolio.....  $     794,731   $     621,433   $     676,893   $     221,071   $     198,391   $      42,733
Institutional Cash Portfolio........  $       7,878   $       9,292   $       7,595   $    --         $    --         $    --
Money Market Portfolio                      *               *               *               *               *               *
</TABLE>
 
- ------------------------------
 
* Not in operation during such period.
 
                                      S-7
<PAGE>
                                  THE ADVISER
 
    The Trust and Wellington Management Company, LLP ("the Adviser") have
entered into an investment advisory agreement (the "Advisory Agreement") dated
October 30, 1985. The Advisory Agreement provides that the Adviser shall not be
protected against any liability to the Trust or its shareholders by reason of
willful misfeasance, bad faith or gross negligence on its part in the
performance of its duties or from reckless disregard of its obligations or
duties thereunder.
 
    The continuance of the Advisory Agreement after the first two (2) years of
the Agreement must be specifically approved at least annually (i) by the vote of
a majority of the outstanding shares of that Portfolio or by the Trustees, and
(ii) by the vote of a majority of the Trustees who are not parties to the
Advisory Agreement or "interested persons" of any party thereto, cast in person
at a meeting called for the purpose of voting on such approval. The Advisory
Agreement will terminate automatically in the event of its assignment, and is
terminable at any time without penalty by the Trustees of the Trust or, with
respect to a Portfolio, by a majority of the outstanding shares of that
Portfolio, on not less than 30 days' nor more than 60 days' written notice to
the Adviser, or by the Adviser on 90 days' written notice to the Trust.
 
    The Adviser is entitled to a fee for its investment advisory services, which
is calculated daily and paid monthly, at the following annual rates: .075% of
the Trust's daily net assets up to $500 million, and .02% of the Trust's daily
net assets in excess of $500 million. The fee is allocated among the Portfolios
based upon their relative net assets.
 
    For the fiscal years ended June 30, 1995, 1996, and 1997 the Portfolios paid
the Adviser advisory fees as follows:
 
<TABLE>
<CAPTION>
                                                                 ADVISORY FEES PAID
                                                    ---------------------------------------------
                                                        1995            1996            1997
                                                    -------------   -------------   -------------
<S>                                                 <C>             <C>             <C>
Treasury Securities Portfolio.....................  $     395,983   $     381,950   $     261,109
Prime Obligation Portfolio........................  $     311,042   $     274,922   $     296,290
Government Securities Portfolio...................  $      74,686   $      63,381   $      61,539
Institutional Cash Portfolio......................  $    --         $    --         $    --
Money Market Portfolio............................        *               *               *
</TABLE>
 
- ------------------------
 
* Not in operation during such period.
 
                     DISTRIBUTION AND SHAREHOLDER SERVICING
 
    The Trust has adopted a Distribution Agreement for the Portfolios dated
November 29, 1982. The Trust has also adopted a Class D Distribution Plan (the
"Class D Plan") for the Treasury Securities Portfolio in accordance with Rule
12b-1 under the 1940 Act, which regulates the circumstances under which an
investment company may directly or indirectly bear expenses relating to the
distribution of its shares. In this regard, the Board of Trustees has determined
that the Class D Plan and the Distribution Agreement are in the best interests
of the Shareholders. Continuance of the Class D Plan must be approved annually
by a majority of the Trustees of the Trust, and by a majority of the Trustees
who are not "interested persons" of the Trust as that term is defined in the
1940 Act, and who have no direct or indirect financial interest in the operation
of a Distribution Plan or in any agreements related thereto ("Qualified
Trustees"). The Class D Plan requires that quarterly written reports of amounts
spent under the Plan and the purposes of such expenditures be furnished to and
reviewed by the Trustees. The Class D Plan may not be amended to increase
materially the amount which may be spent thereunder without approval by a
majority of the outstanding shares of the Portfolio. All material amendments of
the Class D Plan will require approval by a majority of the Trustees of the
Trust and of the Qualified Trustees.
 
                                      S-8
<PAGE>
    The Class D Plan provides that the Trust will pay the Distributor a fee on
the Class D shares of the Portfolio. The Distributor may use this fee for: (i)
compensation for its services in connection with distribution assistance or
provision of shareholder services or (ii) payments to financial institutions and
intermediaries such as banks, savings and loan associations, insurance companies
and investment counselors, broker-dealers and the Distributor's affiliates and
subsidiaries as compensation for services or reimbursement of expenses incurred
in connection with distribution assistance or provision of shareholder services.
 
    The Portfolios have adopted a shareholder servicing plan for its Class A
shares (the "Class A Plan"). Under this Plan, the Distributor may perform, or
may compensate other service providers for performing, the following shareholder
and administrative services: maintaining client accounts; arranging for bank
wires; responding to client inquiries concerning services provided on
investments; assisting clients in changing dividend options, account
designations and addresses; sub-accounting; providing information on share
positions to clients; forwarding shareholder communications to clients;
processing purchase, exchange and redemption orders; and processing dividend
payments. Under the Service Plan, the Distributor may retain as a profit any
difference between the fee it receives and the amount it pays to third parties.
 
    For the fiscal year ended June 30, 1997, the Portfolios incurred the
following distribution expenses:
<TABLE>
<CAPTION>
                                                                                                     PROSPECTUS
                                                                 AMOUNT PAID TO                      PRINTING &
                                                               3RD PARTIES BY SFS                      MAILING
                                                                 FOR DISTRIBUTOR                     COSTS (NEW
                                       TOTAL         BASIS      RELATED SERVICES     ADVERTISING    SHAREHOLDERS
PORTFOLIO/CLASS                      ($AMOUNT)      POINTS          ($AMOUNT)         ($AMOUNT)    ONLY) ($AMOUNT)
- ---------------------------------  -------------  -----------  -------------------  -------------  ---------------
<S>                                <C>            <C>          <C>                  <C>            <C>
 
CLASS D
  Treasury Securities............    $     464          .20%        $     464         $      --       $      --
 
<CAPTION>
 
                                   COSTS ASSOCIATED
                                   WITH REGISTRATION
PORTFOLIO/CLASS                     FEES ($AMOUNT)       OTHER
- ---------------------------------  -----------------  -----------
<S>                                <C>                <C>
CLASS D
  Treasury Securities............      $      --       $      --
</TABLE>
 
                       TRUSTEES AND OFFICERS OF THE TRUST
 
    The Trustees and Executive Officers of the Trust, their respective dates of
birth, and their principal occupations for the last five years are set forth
below. Each may have held other positions with the named companies during that
period. Unless otherwise noted, the business address of each Trustee and
executive officer is SEI Investments Company, Oaks, Pennsylvania 19456. Certain
officers of the Trust also serve as officers of some of the following: The
Achievement Funds Trust, The Advisors' Inner Circle Fund, The Arbor Fund, ARK
Funds, Bishop Street Funds, CoreFunds, Inc., CrestFunds, Inc., CUFUND, The
Expedition Funds, FMB Funds, Inc., First American Funds, Inc., First American
Investment Funds, Inc., First American Strategy Funds, Inc., HighMark Funds,
Marquis Funds-Registered Trademark-, Monitor Funds, Morgan Grenfell Investment
Trust, The PBHG Funds, Inc., The Pillar Funds, Profit Funds Investment Trust,
Rembrandt Funds-Registered Trademark-, Santa Barbara Group of Mutual Funds,
Inc., Boston 1784 Funds, SEI Asset Allocation Trust, SEI Daily Income Trust, SEI
Index Funds, SEI Institutional Investments Trust, SEI Institutional Managed
Trust, SEI International Trust, SEI Tax Exempt Trust, STI Classic Funds, STI
Classic Variable Trust and TIP Funds, open-end management investment companies
which are managed by SEI Fund Management or its affiliates and, except for and
with the exception of Profit Funds Investment Trust, Rembrandt
Funds-Registered Trademark-, and Santa Barbara Group of Mutual Funds, Inc., are
distributed by SEI Investments Distribution Co. (the "Distributor").
 
    ROBERT A. NESHER (DOB 08/17/46)--Chairman of the Board of
Trustees*--Currently performs various services on behalf of SEI for which Mr.
Nesher is compensated. Executive Vice President of SEI, 1986-1994. Director and
Executive Vice President of the Manager and the Distributor, 1981-1994. Trustee
of the Arbor Fund, Marquis Funds-Registered Trademark-, The Advisors' Inner
Circle Fund, SEI Asset Allocation Trust, SEI Daily Income Trust, SEI Tax Exempt
Trust, SEI Index Funds, SEI Institutional Managed Trust, SEI
 
                                      S-9
<PAGE>
Institutional Investments Trust, SEI International Trust, Insurance Investment
Products Trust, Boston 1784 Funds-Registered Trademark-, Pillar Funds, and
Rembrandt Funds-Registered Trademark-.
 
    WILLIAM M. DORAN (DOB 05/26/40)--Trustee*--2000 One Logan Square,
Philadelphia, PA 19103. Partner, Morgan, Lewis & Bockius LLP (law firm), counsel
to the Trust, Manager and Distributor, Director and Secretary of SEI and
Secretary of the Manager and Distributor. Trustee of the Arbor Fund, Marquis
Funds-Registered Trademark-, The Advisors' Inner Circle Fund, SEI Asset
Allocation Trust, SEI Daily Income Trust, SEI Tax Exempt Trust, SEI Index Funds,
SEI Institutional Managed Trust, SEI Institutional Investments Trust, and SEI
International Trust.
 
    F. WENDELL GOOCH (DOB 12/03/32)--Trustee**--P.O. Box 190, Paoli, IN 47454.
President, Orange County Publishing Co., Inc. from October 1981 to January 1,
1997. Publisher of the Paoli News and the Paoli Republican and Editor of the
Paoli Republican since January 1981. President, H & W Distribution, Inc. since
July 1984. Executive Vice President, Trust Department, Harris Trust and Savings
Bank and Chairman of the Board of Directors of The Harris Trust Company of
Arizona before January 1981. Trustee of STI Classic Funds, SEI Asset Allocation
Trust, SEI Daily Income Trust, SEI Tax Exempt Trust, SEI Index Funds, SEI
Institutional Managed Trust, SEI Institutional Investments Trust and SEI
International Trust.
 
    FRANK E. MORRIS (DOB 12/30/23)--Trustee**--105 Walpole Street, Dover, MA
02030. Retired since 1990. Peter Drucker Professor of Management, Boston
College, 1989-1990. President, Federal Reserve Bank of Boston, 1968-1988.
Trustee of The Arbor Fund, Marquis Funds-Registered Trademark-, The Advisors'
Inner Circle Fund, SEI Asset Allocation Trust, SEI Daily Income Trust, SEI Tax
Exempt Trust, SEI Index Funds, SEI Institutional Managed Trust, SEI
Institutional Investments Trust, and SEI International Trust.
 
    JAMES M. STOREY (DOB 04/12/31)--Trustee**--89A Mt. Vernon Street, Boston, MA
02108.-- Partner, Dechert Price & Rhoads, from September 1987 - December 1993.
Trustee of the Arbor Fund, Marquis Funds-Registered Trademark-, The Advisors'
Inner Circle Fund, SEI Asset Allocation Trust, SEI Daily Income Trust, SEI Tax
Exempt Trust, SEI Index Funds, SEI Institutional Managed Trust, SEI
Institutional Investments Trust, and SEI International Trust.
 
    GEORGE J. SULLIVAN, JR. (DOB 11/13/42)--Trustee**--48 Catherine Drive,
Peabody, MA 01960. General Partner, Teton Partners, L.P., since 1991; Chief
Financial Officer, Noble Partners, L.P., since 1991; Treasurer and Clerk, Peak
Asset Management, Inc., since 1991; Trustee, Navigator Securities Lending Trust,
since 1995. Trustee of SEI Asset Allocation Trust, SEI Daily Income Trust, SEI
Tax Exempt Trust, SEI Index Funds, SEI Institutional Managed Trust, SEI
Institutional Investments Trust, and SEI International Trust.
 
    DAVID G. LEE (DOB 04/16/52)--President and Chief Executive Officer--Senior
Vice President of the Manager and Distributor since 1993. Vice President of the
Manager and Distributor, 1991-1993. President, GW Sierra Trust Funds before
1991.
 
    SANDRA K. ORLOW (DOB 10/18/53)--Vice President and Assistant Secretary--Vice
President and Assistant Secretary of the Manager and Distributor since 1988.
 
    KEVIN P. ROBINS (DOB 04/15/61)--Vice President and Assistant
Secretary--Senior Vice President, General Counsel of SEI, the Manager and
Distributor since 1994. Vice President and Assistant Secretary of SEI, the
Manager and Distributor, 1992-1994. Associate, Morgan, Lewis & Bockius LLP (law
firm), 1988-1992.
 
    RICHARD W. GRANT (DOB 10/25/45)--Secretary--2000 One Logan Square,
Philadelphia, PA 19103, Partner, Morgan, Lewis & Bockius LLP (law firm), counsel
to the Trust, Manager and Distributor.
 
    KATHRYN L. STANTON (DOB 11/19/58)--Vice President and Assistant
Secretary--Deputy General Counsel, Vice President and Assistant Secretary of
SEI, the Manager and Distributor since 1994, General
 
                                      S-10
<PAGE>
Counsel, Investment Systems & Services since 1997. Associate, Morgan, Lewis &
Bockius LLP (law firm), 1989-1994.
 
    MARK E. NAGLE (DOB 10/20/59)--Controller and Chief Financial Officer--Vice
President of Fund Accounting and Administration for SEI Fund Resources and the
Manager since 1996. Vice President of Fund Accounting, BISYS Fund Services
(1995-1996). Fidelity Investments (1981-1995).
 
    TODD CIPPERMAN (DOB 02/14/66)--Vice President and Assistant Secretary--Vice
President and Assistant Secretary of SEI, the Manager and the Distributor since
1995. Associate, Dewey Ballantine (law firm) (1994-1995). Associate, Winston &
Strawn (law firm) (1991-1994).
 
    BARBARA A. NUGENT (DOB 06/18/56)--Vice President and Assistant
Secretary--Vice President and Assistant Secretary of SEI, the Manager and
Distributor since 1996. Associate, Drinker, Biddle & Reath (law firm). Assistant
Vice President/Administration, Delaware Service Company, Inc. (1992-1993),
Assistant Vice President - Operations, Delaware Service Company, Inc.
(1988-1992).
 
    MARC H. CAHN (DOB 06/19/57)--Vice President and Assistant Secretary--Vice
President and Assistant Secretary of SEI, the Manager and Distributor since
1996. Associate General Counsel, Barclays Bank PLC (1995-1996). ERISA counsel,
First Fidelity Bancorporation (1994-1995), Associate, Morgan, Lewis & Bockius
LLP (1989-1994).
 
- ------------------------
 
 * Messrs. Nesher and Doran are Trustees who may be deemed to be "interested
   persons" of the Trust as the term is defined in the 1940 Act.
 
** Messrs. Gooch, Storey, Sullivan and Morris serve as members of the Audit
   Committee of the Trust.
 
    The Trustees and officers of the Trust own less than 1% of the outstanding
shares of the Trust. The Trust pays the fees for unaffiliated Trustees.
Compensation of officers and affiliated Trustees of the Trust is paid by the
Manager.
 
    The following table sets forth information about the compensation paid to
the Trustees for the fiscal year ended June 30, 1997:
 
<TABLE>
<CAPTION>
                                                                                                             TOTAL
                                                                  PENSION OR                           COMPENSATION FROM
                                               AGGREGATE          RETIREMENT           ESTIMATED         REGISTRANT AND
                                             COMPENSATION      BENEFITS ACCRUED         ANNUAL        FUND COMPLEX PAID TO
                                            FROM REGISTRANT       AS PART OF         BENEFITS UPON     DIRECTORS FOR FYE
NAME OF PERSON AND POSITION                 FOR FYE 6/30/97      FUND EXPENSES        RETIREMENT            6/30/97
- -----------------------------------------  -----------------  -------------------  -----------------  --------------------
<S>                                        <C>                <C>                  <C>                <C>
Robert A. Nesher, Trustee................      $  --                     N/A                 N/A      $  --
William M. Doran, Trustee................      $  --                     N/A                 N/A      $  --
F. Wendell Gooch, Trustee................      $   5,224                 N/A                 N/A      $94,500 on services
                                                                                                      on 8 boards
Frank E. Morris, Trustee.................      $   5,224                 N/A                 N/A      $94,500 on service
                                                                                                      on 8 boards
James M. Storey, Trustee.................      $   5,224                 N/A                 N/A      $94,500 on service
                                                                                                      on 8 boards
George J. Sullivan, Trustee..............      $   5,224                 N/A                 N/A      $94,500 on services
                                                                                                      on 8 boards
</TABLE>
 
    Mr. Edward W. Binshadler is a Trustee Emeritus of the Trust. Mr. Binshadler
serves as a consultant to the Audit Committee and receives as compensation,
$5,000 per Audit Committee meeting attended.
 
                       FUNDAMENTAL INVESTMENT LIMITATIONS
 
    The following investment limitations are fundamental policies of each
Portfolio which cannot be changed with respect to a Portfolio without the
consent of the holders of a majority of that Portfolio's outstanding shares. The
term "majority of outstanding shares" means the vote of (i) 67% or more of a
Portfolio's shares present at a meeting, if more than 50% of the outstanding
shares of a Portfolio are
 
                                      S-11
<PAGE>
present or represented by proxy, or (ii) more than 50% of a Portfolio's
outstanding shares, whichever is less.
 
No Portfolio may:
 
1.  Borrow money except for temporary or emergency purposes and then only in an
    amount not exceeding 10% of the value of the total assets of that Portfolio.
    This borrowing provision is included solely to facilitate the orderly sale
    of portfolio securities to accommodate substantial redemption requests if
    they should occur and is not for investment purposes. All borrowings by a
    Portfolio will be repaid before making additional investments for that
    Portfolio and any interest on such borrowings will reduce the income of that
    Portfolio.
 
2.  Make loans, except that any Portfolio may purchase or hold debt instruments
    in accordance with its investment objective and policies and may enter into
    repurchase agreements, provided that repurchase agreements maturing in more
    than seven days, restricted securities and other illiquid securities are not
    to exceed, in the aggregate, 10% of the Portfolio's total assets.
 
3.  Pledge, mortgage or hypothecate assets except to secure temporary
    borrowings, as described in the Prospectus, in aggregate amounts not to
    exceed 10% of the net assets of such Portfolio taken at fair market value at
    the time such loan is incurred.
 
4.  Invest in companies for the purpose of exercising control.
 
5.  Acquire more than 10% of the voting securities of any one issuer.
 
6.  Purchase or sell real estate, real estate limited partnership interests,
    commodities or commodities contracts including futures contracts. However,
    subject to its permitted investments, any Portfolio may purchase obligations
    issued by companies which invest in real estate, real estate limited
    partnerships, commodities or commodities contracts.
 
 7. Make short sales of securities, maintain a short position or purchase
    securities on margin, except that a Portfolio may obtain short-term credits
    as necessary for the clearance of security transactions.
 
 8. Act as an underwriter of securities of other issuers except as it may be
    deemed an underwriter in selling a portfolio security.
 
 9. Purchase securities of other investment companies except as permitted by the
    1940 Act and the rules and regulations thereunder and, in any event, may not
    purchase securities of other open-end investment companies. Under these
    rules and regulations, the Portfolios are prohibited from acquiring the
    securities of other investment companies if, as a result of such
    acquisition, a Portfolio owns more than 3% of the total voting stock of an
    investment company; securities issued by any one investment company
    represent more than 5% of the total Portfolio assets; or securities (other
    than treasury stock) issued by all investment companies represent more than
    10% of the total assets of a Portfolio. These investment companies typically
    incur fees that are separate from those fees incurred directly by a
    Portfolio. A Portfolio's purchase of such investment companies results in
    the layering of expenses such that shareholders would indirectly bear a
    proportionate share of such investment companies' expenses, including
    advisory fees.
 
10. Issue senior securities (as defined in the Investment Company Act of 1940)
    except in connection with permitted borrowings as described in the
    Prospectus and this Statement of Additional Information or as permitted by
    rule, regulation or order of the Securities and Exchange Commission.
 
11. Purchase or retain securities of an issuer if, to the knowledge of the
    Trust, an officer, trustee, partner or director of the Trust or any
    investment adviser of the Trust owns beneficially more than of 1% of the
    shares or securities of such issuer and all such officers, trustees,
    partners and directors owning more than of 1% of such shares or securities
    together own more than 5% of such shares or securities.
 
                                      S-12
<PAGE>
12. Purchase securities of any company which has (with predecessors) a record of
    less than three years' continuing operations, except (i) obligations issued
    or guaranteed by the U.S. Government, its agencies or instrumentalities, or
    (ii) municipal securities which are rated by at least two nationally
    recognized municipal bond rating services, if, as a result, more than 5% of
    the total assets (taken at fair market value) of the Portfolio would be
    invested in such securities.
 
13. Purchase warrants, puts, calls, straddles, spreads or combinations thereof.
 
14. Invest in interests in oil, gas or other mineral exploration or development
    programs.
 
15. Purchase restricted securities (securities which must be registered under
    the Securities Act of 1933 before they may be offered or sold to the public)
    or other illiquid securities except as described in the Prospectus and this
    Statement of Additional Information.
 
    Except with respect to the limitation on investing in illiquid securities,
the foregoing percentages will apply at the time of the purchase of a security
and shall not be considered violated unless an excess or deficiency occurs or
exists immediately after and as a result of a purchase of such security.
 
                     NON-FUNDAMENTAL INVESTMENT LIMITATIONS
 
    The following investment limitation is a non-fundamental policy of the Trust
and may be changed without shareholder approval.
 
1.  The Government Securities and Prime Obligation Portfolios must maintain an
    average dollar-weighted portfolio maturity of 90 days or less.
 
                                  PERFORMANCE
 
    From time to time, each Portfolio may advertise its yield. These figures
will be based on historical earnings and are not intended to indicate future
performance.
 
    The current yield of each Portfolio is calculated daily based upon the seven
days ending on the date of calculation ("base period"). The yield is computed by
determining the net change (exclusive of capital changes) in the value of a
hypothetical pre-existing shareholder account having a balance of one share at
the beginning of the period, subtracting a hypothetical charge reflecting
deductions from shareholder accounts and dividing such net change by the value
of the account at the beginning of the same period to obtain the base period
return and multiplying the result by (365/7). Realized and unrealized gains and
losses are not included in the calculation of the yield.
 
    The Portfolios compute their effective compound yield by determining the net
changes, exclusive of capital changes, in the value of a hypothetical
pre-existing account having a balance of one share at the beginning of the
period, subtracting a hypothetical charge reflecting deductions from shareholder
accounts, and dividing the difference by the value of the account at the
beginning of the base period to obtain the base period return, and then
compounding the base period return by adding 1, raising the sum to a power equal
to 365 divided by 7, and subtracting 1 from the result, according to the
following formula: Effective Yield = [(Base Period Return + 1)(365/7) - 1]. The
current and the effective yields reflect the reinvestment of net income earned
daily on portfolio assets.
 
    Actual yields will depend on such variables as asset quality, average asset
maturity, the type of instruments a Portfolio invests in, changes in interest
rates on money market instruments, changes in the expenses of the Portfolios and
other factors.
 
    Yields are one basis upon which investors may compare the Portfolios with
other money market funds; however, yields of other money market mutual funds and
other investment vehicles may not be comparable because of the factors set forth
above and differences in the methods used in valuing portfolio instruments.
 
                                      S-13
<PAGE>
    For the seven-day period ended June 30, 1997 the Portfolios' yield and
effective yield were as follows:
 
<TABLE>
<CAPTION>
                                                                                7-DAY
                                                                              EFFECTIVE
PORTFOLIO/CLASS                                      CLASS    7-DAY YIELD       YIELD
- --------------------------------------------------  --------  ------------   ------------
<S>                                                 <C>       <C>            <C>
Treasury Securities...............................  Class A          5.13           5.26
                                                    Class D          4.78           4.89
Government Securities.............................  Class A          5.00           5.12
Prime Obligation..................................  Class A          5.28           5.42
Institutional Cash................................  Class A           N/A            N/A
Money Market......................................  Class A           N/A            N/A
</TABLE>
 
                        DETERMINATION OF NET ASSET VALUE
 
    Securities of the Portfolios will be valued by the amortized cost method,
which involves valuing a security at its cost on the date of purchase and
thereafter (absent unusual circumstances) assuming a constant amortization to
maturity of any discount or premium, regardless of the impact of fluctuations in
general market rates of interest on the value of the instrument. While this
method provides certainty in valuation, it may result in periods during which
value, as determined by this method is higher or lower than the price a
Portfolio would receive if it sold the instrument. During periods of declining
interest rates, the daily yield of a Portfolio may tend to be higher than a like
computation made by a company with identical investments utilizing a method of
valuation based upon market prices and estimates of market prices for all of its
portfolio securities. Thus, if the use of amortized cost by the Trust resulted
in a lower aggregate portfolio value on a particular day, a prospective investor
in a Portfolio would be able to obtain a somewhat higher yield than would result
from investment in a company utilizing solely market values, and existing
shareholders in the Portfolio would experience a lower yield. The converse would
apply in a period of rising interest rates.
 
    The Trust's use of amortized cost valuation and the maintenance of the net
asset value of each Portfolio at $1.00 are permitted by Rule 2a-7, under the
1940 Act, provided that certain conditions are met. Under Rule 2a-7, a money
market portfolio must maintain a dollar-weighted average maturity in the
Portfolio of 90 days or less and not purchase any instrument having a remaining
maturity of more than 397 days. In addition, money market funds may acquire only
U.S. dollar denominated obligations that present minimal credit risks and that
are "eligible securities," which means they are (i) rated, at the time of
investment, by at least two nationally recognized statistical rating
organizations (one if it is the only organization rating such obligation) in the
highest short-term rating category or, if unrated, determined to be of
comparable quality (a "first tier security"), or (ii) rated according to the
foregoing criteria in the second highest short-term rating category or, if
unrated, determined to be of comparable quality ("second tier security"). The
Adviser will determine that an obligation presents minimal credit risks or that
unrated instruments are of comparable quality in accordance with guidelines
established by the Trustees. The Trustees must approve or ratify the purchase of
any unrated securities. In addition, investments in second tier securities are
subject to the further constraints that (i) no more than 5% of a Portfolio's
assets may be invested in such securities in the aggregate, and (ii) any
investment in such securities of one issuer is limited to the greater of 1% of
the Portfolio's total assets or $1 million.
 
    The regulations also require the Trustees to establish procedures which are
reasonably designed to stabilize the net asset value per unit at $1.00 for each
Portfolio. However, there is no assurance that the Trust will be able to meet
this objective. The Trust's procedures include the determination of the extent
of deviation, if any, of each Portfolio's current net asset value per unit
calculated using available market quotations from each Portfolio's amortized
cost price per unit at such intervals as the Trustees deem appropriate and
reasonable in light of market conditions and periodic reviews of the amount of
the deviation and the methods used to calculate such deviation. In the event
that such deviation exceeds 1/2 of 1%, the Trustees are required to consider
promptly what action, if any, should be initiated, and, if the Trustees believe
that the extent of any deviation may result in material dilution or other unfair
results to
 
                                      S-14
<PAGE>
shareholders, the Trustees are required to take such corrective action as they
deem appropriate to eliminate or reduce such dilution or unfair results to the
extent reasonably practicable. In addition, if any Portfolio incurs a
significant loss or liability, the Trustees have the authority to reduce pro
rata the number of shares of that Portfolio in each shareholder's account and to
offset each shareholder's pro rata portion of such loss or liability from the
shareholder's accrued but unpaid dividends or from future dividends.
 
                       PURCHASE AND REDEMPTION OF SHARES
 
    Purchases and redemptions of shares of the Funds may be made on any day the
New York Stock Exchange is open for business. Currently, the following holidays
are observed by the Trust: New Year's Day, Martin Luther King, Jr. Day,
Presidents' Day, Good Friday, Memorial Day, Independence Day, Labor Day,
Thanksgiving Day and Christmas Day.
 
    The Trust reserves the right to suspend the right of redemption and/or to
postpone the date of payment upon redemption for any period during which trading
on the New York Stock Exchange is restricted, or during the existence of an
emergency (as determined by the SEC by rule or regulation) as a result of which
disposal or evaluation of the portfolio securities is not reasonably
practicable, or for such other periods as the SEC may by order permit. The Trust
also reserves the right to suspend sales of shares of the Portfolio for any
period during which the New York Stock Exchange, the Manager, the Adviser, the
Distributor and/or the Custodian are not open for business.
 
                     SHAREHOLDER SERVICES (CLASS D SHARES)
 
    STOP-PAYMENT REQUESTS:  Investors may request a stop payment on checks by
providing the Trust with a written authorization to do so. Oral requests will be
accepted provided that the Trust promptly receives a written authorization. Such
requests will remain in effect for six months unless renewed or canceled. The
Trust will use its best efforts to effect stop-payment instructions, but does
not promise or guarantee that such instructions will be effective. Shareholders
requesting stop payment will be charged a $20 service fee per check which will
be deducted from their accounts.
 
    RIGHT OF ACCUMULATION:  A shareholder qualifies for cumulative quantity
discounts when his new investment, together with the current market value of all
holdings of that shareholder in certain eligible portfolios reaches a discount
level. See "Purchase and Redemption of Shares" in the Prospectuses for the sales
charge on quantity purchases.
 
    LETTER OF INTENT:  The reduced sales shares are also applicable to the
aggregate amount of purchases made by any such purchaser previously enumerated
within a 13-month period pursuant to a written Letter of Intent provided by the
Distributor, and not legally binding on the signer or a Portfolio which provides
for the holder in escrow by the Manager of 5% of the total amount intended to be
purchased until such purchase is completed within the 13-month period. A Letter
of Intent may be dated to include shares purchased up to 90 days prior to the
date of the Letter of Intent is signed. The 13-month period begins on the date
of the earliest purchase. If the intended investment is not completed, the
Manager will surrender an appropriate number of the escrowed shares for
redemption.
 
    DISTRIBUTION INVESTMENT OPTION:  Distributions of dividends and capital
gains made by the Portfolios may be automatically invested in shares of one of
the Portfolios if shares of the Portfolio are available for sale. Such
investments will be subject to initial investment minimums, as well as
additional purchase minimums. A shareholder considering the Distribution
Investment Option should obtain and read the prospectus of the Portfolios and/or
classes in which such automatic investments are to be made and consider the
differences in investment objectives and policies before making any investment.
 
    REINSTATEMENT PRIVILEGE:  A shareholder who has redeemed shares of any of
the Portfolios has a one-time right to reinvest the redemption proceeds in
shares of the Portfolio at their net asset value as of the time of reinvestment.
Such a reinvestment must be made within 30 days of the redemption and is limited
to
 
                                      S-15
<PAGE>
the amount of the redemption proceeds. Although redemptions and repurchases of
shares are taxable events, a reinvestment within such 30-day period in the same
fund is considered a "wash sale" and results in the inability to recognize
currently all or a portion of a loss realized on the original redemption for
federal income tax purposes. The investor must notify the Transfer Agent at the
time the trade is placed that the transaction is a reinvestment.
 
    EXCHANGE PRIVILEGE:  Some or all of the shares of the Portfolio for which
payment has been received (I.E., an established account) may be exchanged, at
their net asset value, plus any applicable sales charge, for Class D shares of
the Trust, SEI Tax Exempt Trust, SEI International Trust and SEI Institutional
Managed Trust or at their net asset value for Class D shares of other portfolios
of such trusts that do not have sales charges. Exchanges will be made only after
proper instructions in writing or by telephone (an "Exchange Request") are
received for an established account by the Distributor.
 
    A shareholder may exchange a Portfolio's Class D shares, for which good
payment has been received, in his account at any time, regardless of how long he
has held his shares.
 
    Each Exchange Request must be in proper form (I.E., if in writing, signed by
the record owner(s) exactly as the shares are registered; if by telephone,
proper account identification is given by the dealer or shareholder of record),
and each exchange must involve either shares having an aggregate value of at
least $1,000 or all the shares in the account. Each exchange involves the
redemption of the shares of a Portfolio to be exchanged and the purchase of the
shares of the other Portfolio. Any gain or loss on the redemption of the shares
exchanged is reportable on the shareholder's Federal income tax return, unless
such shares were held in a tax-deferred retirement plan or other tax-exempt
account. If the Exchange Request is received by the Distributor in writing or by
telephone on any Business Day, as defined in the Prospectuses of the Trust,
prior to the close of the New York Stock Exchange, the exchange will be
effective on that day if all the restrictions set forth above have been complied
with at that time. However, payment of the redemption proceeds by the
Portfolios, and thus the purchase of shares of the other Portfolios, may be
delayed for up to seven days if the Portfolios determine that such delay would
be in the best interest of all of its shareholders. Investment dealers which
have satisfied criteria established by the Portfolios may also communicate a
shareholder's Exchange Request to the Portfolios subject to the restrictions set
forth above. No more than five exchange requests may be made in any one
telephone Exchange Request.
 
                                     TAXES
 
    The following is only a summary of certain tax considerations generally
affecting a Portfolio and its shareholders, and is not intended as a substitute
for careful tax planning. Shareholders are urged to consult their tax advisors
with specific reference to their own tax situations, including their state and
local tax liabilities.
 
FEDERAL INCOME TAXES
 
    The following discussion of federal income tax consequences is based on the
Internal Revenue Code of 1986, as amended (the "Code"), and the regulations
issued thereunder as in effect on the date of this Statement of Additional
Information. New legislation, as well as administrative changes or court
decisions, may significantly change the conclusions expressed herein, and may
have a retroactive effect with respect to the transactions contemplated herein.
 
    Each Portfolio intends to qualify as a regulated investment company ("RIC")
as defined under Subchapter M of the Code. By following such a policy, each of
the Portfolios expects to eliminate or reduce to a nominal amount the federal
income taxes to which such Portfolio may be subject.
 
    In order to qualify for treatment as a RIC, a Portfolio must distribute
annually to its shareholders at least the sum of 90% of its net interest income
excludable from gross income plus 90% of its investment company taxable income
(generally, net investment income plus the excess of net short-term capital gain
 
                                      S-16
<PAGE>
over net long-term capital loss) (the "Distribution Requirement") and also must
meet several additional requirements. Among these requirements are the
following: (i) at least 90% of a Portfolio's gross income each taxable year must
be derived from dividends, interest, payments with respect to securities loans,
and gains from the sale or other disposition of stock or securities, or other
income derived with respect to its business of investing in such stock or
securities; (ii) at the close of each quarter of a Portfolio's taxable year, at
least 50% of the value of its total assets must be represented by cash and cash
items, U.S. government securities, securities of other RIC's, and other
securities, with such other securities limited, in respect of any one issuer, to
an amount that does not exceed 5% of the value of a Portfolio's assets and that
does not represent more than 10% of the outstanding voting securities of such
issuer; and (iii) at the close of each quarter of a Portfolio's taxable year,
not more than 25% of the value of its assets may be invested in securities
(other than U.S. government securities or the securities of other RIC's) of any
one issuer or of two or more issuers which are engaged in the same, similar or
related trades or businesses if the Portfolio owns at least 20% of the voting
power of such issuers.
 
    Notwithstanding the Distribution Requirement described above, which only
requires a Portfolio to distribute at least 90% of its annual investment company
taxable income and does not require any minimum distribution of net capital gain
(the excess of net long-term capital gain over net short-term capital loss), a
Portfolio will be subject to a nondeductible 4% federal excise tax to the extent
it fails to distribute by the end of any calendar year at least 98% of its
ordinary income for that year and 98% of its capital gain net income (the excess
of short and long-term capital gains over short and long-term capital losses)
for the one-year period ending on October 31 of that year, plus certain other
amounts. Each Portfolio intends to make sufficient distributions to avoid
liability for the federal excise tax. A Portfolio may in certain circumstances
be required to liquidate Portfolio investments in order to make sufficient
distributions to avoid federal excise tax liability at a time when the
investment advisor might not otherwise have chosen to do so, and liquidation of
investments in such circumstances may affect the ability of a Portfolio to
satisfy the requirements for qualification as a RIC.
 
    Any gain or loss recognized on a sale, exchange or redemption of shares of a
Portfolio by a shareholder who is not a dealer in securities will generally, for
individual shareholders, be treated as a long-term capital gain or loss if the
shares have been held for more than eighteen months, mid-term capital gain if
the share have been held for more than twelve months but not more than eighteen
months, and otherwise will be treated as short-term capital gain or loss.
However, if shares on which a shareholder has received a net capital gain
distribution are subsequently sold, exchanged or redeemed and such shares have
been held for six months or less, any loss recognized will be treated as
long-term capital loss to the extent of the net capital gain distribution.
Long-term capital gains are currently taxed at a maximum rate of 20%, mid-term
capital gains are currently taxed at a maximum rate of 28%, and short-term
capital gains are currently taxed at ordinary income tax rates.
 
    If a Portfolio fails to qualify as a RIC for any year, all of its taxable
income will be subject to tax at regular corporate rates without any deduction
for distributions to shareholders, and its distributions (including capital
gains distributions) generally will be taxable as ordinary income dividends to
its shareholders, subject to the dividends received deduction for corporate
shareholders.
 
    A Portfolio will be required in certain cases to withhold and remit to the
United States Treasury 31% of amounts payable to any shareholder who (1) has
provided the Portfolio either an incorrect tax identification number or no
number at all, (2) who is subject to backup withholding by the Internal Revenue
Service for failure to properly report such payments of interest or dividends,
or (3) who has failed to certify to the Portfolio that such shareholder is not
subject to backup withholding.
 
                                      S-17
<PAGE>
STATE TAXES
 
    A Portfolio is not liable for any income or franchise tax in Massachusetts
if it qualifies as a RIC for federal income tax purposes. Depending upon state
and local law, distributions by the Portfolio to shareholders and the ownership
of shares may be subject to state and local taxes. Shareholders should consult
their own tax Advisers regarding the affect of federal, state and local taxes in
their own individual circumstances.
 
                             PORTFOLIO TRANSACTIONS
 
    The Trust has no obligation to deal with any dealer or group of dealers in
the execution of transactions in portfolio securities. Subject to policies
established by the Trustees, the Adviser is responsible for placing orders to
execute Portfolio transactions. In placing orders, it is the Trust's policy to
seek to obtain the best net results taking into account such factors as price
(including the applicable dealer spread), size, type and difficulty of the
transaction involved, the firm's general execution and operational facilities,
and the firm's risk in positioning the securities involved. While the Adviser
generally seeks reasonably competitive spreads or commissions, the Trust will
not necessarily be paying the lowest spread or commission available. The Trust's
policy of investing in securities with short maturities will result in high
portfolio turnover. The Trust will not purchase portfolio securities from any
affiliated person acting as principal except in conformity with the regulations
of the Securities and Exchange Commission.
 
    The Trust does not expect to use one particular dealer, but, subject to the
Trust's policy of seeking the best net results, dealers who provide supplemental
investment research to the Adviser may receive orders for transactions by the
Trust. Information so received will be in addition to and not in lieu of the
services required to be performed by the Adviser under the Advisory Agreements,
and the expenses of the Adviser will not necessarily be reduced as a result of
the receipt of such supplemental information.
 
    The money market securities in which certain of the Portfolios invest are
traded primarily in the over-the-counter market. Where possible, the Adviser
will deal directly with the dealers who make a market in the securities
involved, except in those circumstances where better prices and execution are
available elsewhere. Such dealers usually are acting as principal for their own
account. On occasion, securities may be purchased directly from the issuer.
Money market securities generally are traded on a net basis and normally do not
involve either brokerage commissions or transfer taxes. The cost of executing
portfolio securities transactions of the Portfolio will primarily consist of
dealer spreads and underwriting commissions.
 
    Since the Trust does not market its shares through intermediary brokers or
dealers, it is not the Trust's practice to allocate brokerage or principal
business on the basis of sales of its shares which may be made through such
firms. However, the Adviser may place portfolio orders with qualified
broker-dealers who recommend the Trust to clients, and may, when a number of
brokers and dealers can provide best price and execution on a particular
transaction, consider such recommendations by a broker or dealer in selecting
among broker-dealers.
 
    For the Trust's fiscal years ended June 30, 1995, 1996 and 1997, no
brokerage fees were paid.
 
                             DESCRIPTION OF SHARES
 
    The Declaration of Trust authorizes the issuance of an unlimited number of
shares of each Portfolio, each of which represents an equal proportionate
interest in that Portfolio. Each share of a Portfolio upon liquidation of that
Portfolio entitles a shareholder to a pro rata share in the net assets of that
Portfolio, after taking into account certain distribution expenses. Shareholders
have no preemptive rights. The Declaration of Trust provides that the Trustees
of the Trust may create additional portfolios of shares or classes of
portfolios. Any consideration received by the Trust for shares of any additional
Portfolio and
 
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<PAGE>
assets in which such consideration is invested would belong to that Portfolio
and would be subject to the liabilities related thereto. Share certificates
representing the shares will not be issued.
 
                       LIMITATION OF TRUSTEES' LIABILITY
 
    The Declaration of Trust provides that a Trustee shall be liable only for
his own willful defaults and, if reasonable care has been exercised in the
selection of officers, agents, employees or administrators, shall not be liable
for any neglect or wrongdoing of any such person. The Declaration of Trust also
provides that the Trust will indemnify its Trustees and officers against
liabilities and expenses incurred in connection with actual or threatened
litigation in which they may be involved because of their offices with the Trust
unless it is determined in the manner provided in the Declaration of Trust that
they have not acted in good faith in the reasonable belief that their actions
were in the best interests of the Trust. However, nothing in the Declaration of
Trust shall protect or indemnify a Trustee against any liability for his willful
misfeasance, bad faith, gross negligence or reckless disregard of his duties.
 
                             SHAREHOLDER LIABILITY
 
    The Trust is an entity of the type commonly known as a "Massachusetts
business trust." Under Massachusetts law, shareholders of the Trust could, under
certain circumstances, be held personally liable for the obligations of the
Trust. However, the possibility of the shareholders' incurring financial loss
appears remote because the Trust's Declaration of Trust contains an express
disclaimer of shareholder liability for obligations of the Trust, and requires
that notice of such disclaimer be given in each agreement, obligation or
instrument entered into or executed by or on behalf of the Trust or the
Trustees. The Declaration of Trust provides for indemnification out of the
Trust's property for any shareholder held personally liable for the obligations
of the Trust.
 
                                5% SHAREHOLDERS
 
    As of October 1, 1997, the following persons were the only persons who were
record owners (or to the knowledge of the Trust, beneficial owners) of 5% or
more of the shares of the Portfolios. The Trust believes that most of the shares
referred to below were held by the persons indicated in accounts for their
fiduciary, agency, or custodial customers.
 
    Treasury Securities Portfolio: First Hawaiian Bank, Financial Management
Group, ATTN: Dolores Mollring, P.O. Box 3200, Honolulu, HI 96847-0001, 9.28%;
Repub & Co., c/o Imperial Trust Co., ATTN: Shirley Matthews, 201 N. Figueroa
Street #610, Los Angeles, CA 90012-2629, 9.63%; The Fulton Company, c/o The
Fulton Bank Trust Department, ATTN: Dennis Patrick, One Penn Square, Lancaster,
PA 17602-2853, 6.27%; Smith & Co., c/o First Security Bank of Utah, ATTN: Money
Market/Mutual Fund Desk, P.O. Box 25297, Salt Lake City, UT 84125-0297, 7.79%;
First Security Bank of Utah, Cash Management, ATTN: Paul Messervy, 41 East 100
South, Salt Lake City, UT 84111-1912, 7.58%.
 
    Government Securities Portfolio: United Jersey Bank, ATTN: Joe Guitari, P.O.
Box 547, Hackensack, NJ 07602-0547, 12.54%; SEI Trust Company, c/o SEI
Corporation, ATTN: Sandra Crawford, P.O. Box 1100 Oaks, PA 19456-1100, 10.95%;
Trust Co. Of Texas, ATTN: Operations, 200 Cresent Court STE 1300, Dallas, TX
75701-1820, 9.64%.
 
    Prime Obligation Portfolio: First Security Bank of Utah, Cash Management,
ATTN: Paul Messervy, 41 East 100 South, Salt Lake City, UT 84111-1912, 10.15%;
Smith and CO, c/o First Security Bank of Utah, ATTN: Money Market/Mutual Fund
Desk, P.O. Box 25297, Salt Lake City, UT 84125-0297, 21.28%; SEI Trust Company,
c/o SEI Corporation, ATTN: Sandra Crawford, P.O. Box 1100, Oaks, PA 19456-1100,
12.06%; Repub & Co., c/o Imperial Trust Co., ATTN: Shirley Matthews, 201 N.
Figueroa Street #610, Los Angeles, CA 90012-2629, 11.99%; BHC Securities Inc.,
ATTN: Cash Sweeps Department, One Commerce Square, 2005 Market Street 11th
Floor, Philadelphia, PA 19103-7042, 13.34%.
 
                                      S-19
<PAGE>
                                    EXPERTS
 
    The financial statements incorporated by reference in this Statement of
Additional Information have been incorporated by reference in reliance on the
report of Price Waterhouse LLP, independent accountants, given on the authority
of said firm as experts in auditing and accounting.
 
                              FINANCIAL STATEMENTS
 
    The Trust's financial statements for the fiscal year ended June 30, 1997,
including notes thereto and the report of Price Waterhouse LLP thereon, are
herein incorporated by reference. A copy of the 1997 Annual Report must
accompany the delivery of this Statement of Additional Information.
 
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