<PAGE> 1
SHORT-TERM INVESTMENTS TRUST
GOVERNMENT & AGENCY PORTFOLIO
CASH MANAGEMENT CLASS
Supplement dated December 18, 1998
to the Prospectus dated September 1, 1998
Effective December 18, 1998, and pursuant to separate prospectuses,
Short-Term Investments Trust (the "Trust") now offers shares of two additional
classes of shares of beneficial interest of the Government & Agency Portfolio:
the Personal Investment Class and the Reserve Class.
A revised Statement of Additional Information, dated December 18, 1998,
has been filed with the Securities and Exchange Commission and can be obtained
without charge by writing or calling the Trust or Fund Management Company.
<PAGE> 2
SHORT-TERM INVESTMENTS TRUST
GOVERNMENT & AGENCY PORTFOLIO
PRIVATE INVESTMENT CLASS
Supplement dated December 18, 1998
to the Prospectus dated September 1, 1998
Effective December 18, 1998, and pursuant to separate prospectuses,
Short-Term Investments Trust (the "Trust") now offers shares of two additional
classes of shares of beneficial interest of the Government & Agency Portfolio:
the Personal Investment Class and the Reserve Class.
A revised Statement of Additional Information, dated December 18, 1998,
has been filed with the Securities and Exchange Commission and can be obtained
without charge by writing or calling the Trust or Fund Management Company.
<PAGE> 3
SHORT-TERM INVESTMENTS TRUST
GOVERNMENT & AGENCY PORTFOLIO
RESOURCE CLASS
Supplement dated December 18, 1998
to the Prospectus dated September 1, 1998
Effective December 18, 1998, and pursuant to separate prospectuses,
Short-Term Investments Trust (the "Trust") now offers shares of two additional
classes of shares of beneficial interest of the Government & Agency Portfolio:
the Personal Investment Class and the Reserve Class.
A revised Statement of Additional Information, dated December 18, 1998,
has been filed with the Securities and Exchange Commission and can be obtained
without charge by writing or calling the Trust or Fund Management Company.
