<PAGE> 1
SHORT-TERM INVESTMENTS TRUST
TREASURY TAXADVANTAGE PORTFOLIO
CASH MANAGEMENT CLASS
Supplement dated July 1, 1999
to the Prospectus dated December 18, 1998
The following information replaces in its entirety the table and example
under the heading "TABLE OF FEES AND EXPENSES" on page 4 of the prospectus.
"TABLE OF FEES AND EXPENSES
<TABLE>
<S> <C> <C>
SHAREHOLDER TRANSACTION EXPENSES*
Maximum sales load imposed on purchases
(as a percentage of offering price).................................................... None
Maximum sales load on reinvested dividends
(as a percentage of offering price).................................................... None
Deferred sales load (as a percentage of original
purchase price or redemption proceeds, as applicable).................................. None
Redemption fees (as a percentage of amount
redeemed, if applicable)............................................................... None
Exchange fee .............................................................................. None
ANNUAL PORTFOLIO OPERATING EXPENSES - CASH MANAGEMENT CLASS
(AS A PERCENTAGE OF AVERAGE NET ASSETS)
Management fees (after fee waivers)**...................................................... 0.03%
12b-1 fees (after fee waivers)**........................................................... 0.08%
Other expenses (estimated):
Custodian fees......................................................................... 0.01%
Other.................................................................................. 0.07%
----
Total other expenses.............................................................. 0.08%
----
Total portfolio operating expenses - Cash Management Class**............................... 0.19%
====
</TABLE>
- -----------------
* Beneficial owners of shares of the Class should consider the effect of any
charges imposed by their bank, broker-dealer or financial institution for
various services.
** Had there been no fee waivers, Management fees, 12b-1 fees and Total
portfolio operating expenses would be 0.20%, 0.10% and 0.38%,
respectively.
EXAMPLE
An investor in the Class 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.
<TABLE>
<S> <C>
1 year........................................ $2
3 years........................................ $6"
</TABLE>
<PAGE> 2
SHORT-TERM INVESTMENTS TRUST
TREASURY TAXADVANTAGE PORTFOLIO
INSTITUTIONAL CLASS
Supplement dated July 1, 1999
to the Prospectus dated December 18, 1998
The following information replaces in its entirety the section under the
heading "TABLE OF FEES AND EXPENSES" on page 4 of the prospectus.
"TABLE OF FEES AND EXPENSES
<TABLE>
<S> <C> <C>
SHAREHOLDER TRANSACTION EXPENSES*
Maximum sales load imposed on purchases
(as a percentage of offering price).................................................... None
Maximum sales load on reinvested dividends
(as a percentage of offering price).................................................... None
Deferred sales load (as a percentage of original
purchase price or redemption proceeds, as applicable).................................. None
Redemption fees (as a percentage of amount
redeemed, if applicable)............................................................... None
Exchange fee .............................................................................. None
ANNUAL PORTFOLIO OPERATING EXPENSES - INSTITUTIONAL CLASS
(AS A PERCENTAGE OF AVERAGE NET ASSETS)
Management fees**.......................................................................... 0.03%
12b-1 fees................................................................................. None
Other expenses:
Custodian fees......................................................................... 0.01%
Other.................................................................................. 0.07%
----
Total other expenses............................................................... 0.08%
----
Total portfolio operating expenses - Institutional Class**................................. 0.11%
====
</TABLE>
- ---------------------
* Beneficial owners of shares of the Class should consider the effect of
any charges imposed by their bank or other financial institution for
various services.
** Had there been no fee waivers, Management fees and Total portfolio
operating expenses would be 0.20% and 0.28%, respectively.
EXAMPLE
An investor 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.
<TABLE>
<S> <C>
1 year..................................... $1
3 years..................................... $4
5 years..................................... $6
10 years..................................... $14
</TABLE>
The Table of Fees and Expenses is designed to assist an investor in
understanding the various costs and expenses that an investor in the Class will
bear directly or indirectly. For more complete descriptions of the various costs
and expenses, see "Management of the Trust" below. The expense figures are based
upon actual costs and fees charged to the Class for the fiscal year ended August
31, 1998, as adjusted for current fee arrangements. Future waivers of fees (if
any) may vary from the figures reflected in the Table of Fees and Expenses. To
the extent any service providers assume expenses of the Class, such assumption
of expenses will have the effect of lowering the Class's overall expense ratio
and increasing its yield to investors. Beneficial owners of shares of the Class
should also consider the effect of any charges imposed by the institution
maintaining their accounts.
The example in the Table of Fees and Expenses assumes that all dividends
and distributions are reinvested and that the amounts listed under "Annual
Portfolio Operating Expenses - Institutional Class" remain the same in the years
shown.
The example shown in the above table is based on the amounts listed under
"Annual Portfolio Operating Expenses." THE EXAMPLE SHOULD NOT BE CONSIDERED TO
BE AN ACCURATE REPRESENTATION OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY
BE GREATER OR LESS THAN THOSE SHOWN."
<PAGE> 3
SHORT-TERM INVESTMENTS TRUST
TREASURY TAXADVANTAGE PORTFOLIO
PERSONAL INVESTMENT CLASS
Supplement dated July 1, 1999
to the Prospectus dated December 18, 1998
The following information replaces in its entirety the table and example
under the heading "TABLE OF FEES AND EXPENSES" on page 4 of the prospectus.
"TABLE OF FEES AND EXPENSES
<TABLE>
<S> <C> <C>
SHAREHOLDER TRANSACTION EXPENSES*
Maximum sales load imposed on purchases
(as a percentage of offering price).................................................... None
Maximum sales load on reinvested dividends
(as a percentage of offering price).................................................... None
Deferred sales load (as a percentage of original
purchase price or redemption proceeds, as applicable).................................. None
Redemption fees (as a percentage of amount
redeemed, if applicable)............................................................... None
Exchange fee .............................................................................. None
ANNUAL PORTFOLIO OPERATING EXPENSES - PERSONAL INVESTMENT CLASS
(AS A PERCENTAGE OF AVERAGE NET ASSETS)
Management fees (after fee waivers)**...................................................... 0.03%
12b-1 fees (after fee waivers)**........................................................... 0.50%***
Other expenses (estimated):
Custodian fees......................................................................... 0.01%
Other.................................................................................. 0.07%
----
Total other expenses.............................................................. 0.08%
----
Total portfolio operating expenses - Personal Investment Class**.......................... 0.61%
====
</TABLE>
* Beneficial owners of shares of the Class should consider the effect of any
charges imposed by their bank, broker-dealer or financial institution for
various services.
** Had there been no fee waivers, Management fees, 12b-1 fees and Total
portfolio operating expenses would be 0.20%, 0.75% and 1.03%,
respectively.
*** It is possible that as a result of Rule 12b-1 fees, long-term shareholders
may pay more than the economic equivalent of the maximum front-end sales
charges permitted under rules of the National Association of Securities
Dealers, Inc. Given the Rule 12b-1 fee of the Class, however, it is
estimated that it would take a substantial number of years for a
shareholder to exceed such maximum front-end sales charges.
Example
An investor in the Class 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.
<TABLE>
<S> <C>
1 year....................................... $6
3 years....................................... $20"
</TABLE>
<PAGE> 4
SHORT-TERM INVESTMENTS TRUST
TREASURY TAXADVANTAGE PORTFOLIO
PRIVATE INVESTMENT CLASS
Supplement dated July 1, 1999
to the Prospectus dated December 18, 1998
The following information replaces in its entirety the table and example
under the heading "TABLE OF FEES AND EXPENSES" on page 4 of the prospectus.
"TABLE OF FEES AND EXPENSES
<TABLE>
<S> <C> <C>
SHAREHOLDER TRANSACTION EXPENSES*
Maximum sales load imposed on purchases
(as a percentage of offering price).................................................... None
Maximum sales load on reinvested dividends
(as a percentage of offering price).................................................... None
Deferred sales load (as a percentage of original purchase price or redemption
proceeds, as applicable)............................................................... None
Redemption fees (as a percentage of amount redeemed,
if applicable)......................................................................... None
Exchange fee .............................................................................. None
ANNUAL PORTFOLIO OPERATING EXPENSES - PRIVATE INVESTMENT CLASS
(AS A PERCENTAGE OF AVERAGE NET ASSETS)
Management fees (after fee waivers)**...................................................... 0.03%
12b-1 fees (after fee waivers)**........................................................... 0.25%***
Other expenses:
Custodian fees......................................................................... 0.01%
Other.................................................................................. 0.07%
----
Total other expenses.............................................................. 0.08%
----
Total portfolio operating expenses - Private Investment Class**............................ 0.36%
====
</TABLE>
- -------------------
* Beneficial owners of shares of the Class should consider the effect of
any charges imposed by their bank, broker-dealer or financial
institution for various services.
** Had there been no fee waivers, Management fees, 12b-1 fees and Total
portfolio operating expenses would be 0.20%, 0.50% and 0.78%,
respectively.
*** It is possible that as a result of Rule 12b-1 fees, long-term
shareholders may pay more than the economic equivalent of the maximum
front-end sales charges permitted under rules of the National
Association of Securities Dealers, Inc. Given the Rule 12b-1 fee of
the Class, however, it is estimated that it would take a substantial
number of years for a shareholder to exceed such maximum front-end
sales charges.
EXAMPLE
An investor in the Class 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.
<TABLE>
<S> <C>
1 year............................... $4
3 years............................... $12
5 years............................... $20
10 years............................... $46"
</TABLE>
<PAGE> 5
SHORT-TERM INVESTMENTS TRUST
TREASURY TAXADVANTAGE PORTFOLIO
RESERVE CLASS
Supplement dated July 1, 1999
to the Prospectus dated December 18, 1998
The following information replaces in its entirety the table and
example under the heading "TABLE OF FEES AND EXPENSES" on page 4 of the
prospectus.
"TABLE OF FEES AND EXPENSES
<TABLE>
<S> <C> <C>
SHAREHOLDER TRANSACTION EXPENSES*
Maximum sales load imposed on purchases
(as a percentage of offering price).................................................... None
Maximum sales load on reinvested dividends
(as a percentage of offering price).................................................... None
Deferred sales load (as a percentage of original
purchase price or redemption proceeds, as applicable).................................. None
Redemption fees (as a percentage of amount
redeemed, if applicable)............................................................... None
Exchange fee .............................................................................. None
ANNUAL PORTFOLIO OPERATING EXPENSES - RESERVE CLASS
(AS A PERCENTAGE OF AVERAGE NET ASSETS)
Management fees (after fee waivers)**...................................................... 0.03%
12b-1 fees (after fee waivers)**........................................................... 0.80%***
Other expenses (estimated):
Custodian fees......................................................................... 0.01%
Other.................................................................................. 0.07%
----
Total other expenses.............................................................. 0.08%
----
Total portfolio operating expenses - Reserve Class**....................................... 0.91%
====
</TABLE>
- ------------
* Beneficial owners of shares of the Class should consider the effect of
any charges imposed by their bank, broker-dealer or financial
institution for various services.
** Had there been no fee waivers, Management fees, 12b-1 fees and Total
portfolio operating expenses would be 0.20%, 1.00% and 1.28%,
respectively.
*** It is possible that as a result of Rule 12b-1 fees, long-term
shareholders may pay more than the economic equivalent of the maximum
front-end sales charges permitted under rules of the National
Association of Securities Dealers, Inc. Given the Rule 12b-1 fee of
the Class, however, it is estimated that it would take a substantial
number of years for a shareholder to exceed such maximum front-end
sales charges.
EXAMPLE
An investor in the Class 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.
<TABLE>
<S> <C>
1 year......................................... $9
3 years......................................... $29"
</TABLE>
<PAGE> 6
SHORT-TERM INVESTMENTS TRUST
TREASURY TAXADVANTAGE PORTFOLIO
RESOURCE CLASS
Supplement dated July 1, 1999
to the Prospectus dated December 18, 1998
The following information replaces in its entirety the table and example
under the heading "TABLE OF FEES AND EXPENSES" on page 4 of the prospectus.
"TABLE OF FEES AND EXPENSES
<TABLE>
<S> <C> <C>
SHAREHOLDER TRANSACTION EXPENSES*
Maximum sales load imposed on purchases
(as a percentage of offering price).................................................... None
Maximum sales load on reinvested dividends
(as a percentage of offering price).................................................... None
Deferred sales load (as a percentage of original
purchase price or redemption proceeds, as applicable).................................. None
Redemption fees (as a percentage of amount
redeemed, if applicable)............................................................... None
Exchange fee .............................................................................. None
ANNUAL PORTFOLIO OPERATING EXPENSES - RESOURCE CLASS
(AS A PERCENTAGE OF AVERAGE NET ASSETS)
Management fees (after fee waivers)**...................................................... 0.03%
12b-1 fees (after fee waivers)**........................................................... 0.16%
Other expenses (estimated):
Custodian fees......................................................................... 0.01%
Other.................................................................................. 0.07%
----
Total other expenses.............................................................. 0.08%
----
Total portfolio operating expenses - Resource Class**...................................... 0.27%
====
</TABLE>
- ---------------------
* Beneficial owners of shares of the Class should consider the effect of any
charges imposed by their bank, broker-dealer or financial institution for
various services.
** Had there been no fee waivers, Management fees, 12b-1 fees and Total
portfolio operating expenses would be 0.20%, 0.20% and 0.48%,
respectively.
EXAMPLE
An investor in the Class 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.
<TABLE>
<S> <C>
1 year...................................... $3
3 years...................................... $9"
</TABLE>
