NOTE 1-SIGNIFICANT ACCOUNTING POLICIES
AIM Limited Maturity Treasury Fund (the "Fund") is a series portfolio of AIM Investment Securities Funds (the
"Trust"). The Trust is a Delaware business trust registered under the Investment Company Act of 1940, as
amended (the "1940 Act"), as an open-end series management company consisting of seven separate series
portfolios each having an unlimited number of shares of beneficial interests. The Fund currently offers two
different classes of shares: Class A shares and the Institutional Class. Matters affecting each portfolio or class are
voted on exclusively by the shareholders of such portfolio or class. The assets, liabilities and operations of each
portfolio are accounted for separately. Information presented in these financial statements pertains only to the
Fund. The Fund's investment objective is to seek liquidity with minimum fluctuation in principal value and,
consistent with this objective, the highest total return achievable.
The preparation of financial statements in conformity with accounting principles generally accepted in the United
States of America requires management to make estimates and assumptions that affect the reported amounts of
assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses
during the reporting period. Actual results could differ from those estimates. The following is a summary of the
significant accounting policies followed by the Fund in the preparation of its financial statements.
A. Security Valuations -- Debt obligations that are issued or guaranteed by the U.S. Treasury are valued on the
basis of prices provided by an independent pricing service. Prices provided by the pricing service may be
determined without exclusive reliance on quoted prices, and may reflect appropriate factors such as yield, type of
issue, coupon rate and maturity date. Securities for which market prices are not provided by any of the above
methods are valued based upon quotes furnish