FSIXX — Fidelity Investments Money Market Treasury Only Portfolio

FSIXX Fund Overview

FSIXX — Fidelity Investments Money Market Treasury Only Portfolio is a US mutual fund managed by Fidelity Colchester Street Trust, categorised as Money Market. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.

• Type: US mutual fund
• Manager: Fidelity Colchester Street Trust
• Category: Money Market
• Ticker: FSIXX
• SEC CIK: 0000356173
• SEC series ID: S000004818
• Share class ID: C000013037

FSIXX Investment Objective and Strategy

Fidelity Investments Money Market Treasury Only Portfolio describes its objective and strategy as follows, from its latest prospectus filed with the SEC by Fidelity Colchester Street Trust.

Investment objective

Treasury Only Portfolio seeks as high a level of current income as is consistent with the security of principal and liquidity.

Principal investment strategy

Normally investing at least 99.5% of total assets in cash and U.S. Treasury securities. Normally investing in securities whose interest is exempt from state and local income taxes. Investing in compliance with industry-standard regulatory requirements for money market funds for the quality, maturity, liquidity, and diversification of investments. In addition, the fund normally invests at least 80% of its assets in U.S. Treasury securities. Treasury securities are high-quality securities issued or guaranteed by the U.S. Treasury. Treasury securities are backed by the full faith and credit of the U.S. Treasury. Treasury securities usually pay a fixed, variable, or floating rate of interest, and must repay the amount borrowed, usually at the maturity of the security.

FSIXX Costs and Fees

FSIXX costs about $18 per $10,000 invested per year in fund expenses.

• Net expense ratio: 0.18%
• Gross expense ratio: 0.21%

FSIXX Debt Constituents

No individual debt constituents are reported in Fidelity Investments Money Market Treasury Only Portfolio's latest SEC N-PORT filing.

FSIXX Prospectus and SEC Filings

Official Fidelity Investments Money Market Treasury Only Portfolio filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.

• Prospectus (485BPOS) — filed 2026-05-26
• Prospectus (485BPOS) — filed 2025-05-27
• Prospectus (485BPOS) — filed 2024-05-24
• Annual census (N-CEN) — filed 2026-06-11
• Annual census (N-CEN) — filed 2025-06-12
• Annual census (N-CEN) — filed 2024-06-14

Related Funds

Other Money Market funds tracked on ABC INVEST:

• Emerald Growth Fund (HSPCX)
• Barings Active Short Duration Bond Fund (BXDIX)
• IVA Worldwide Fund (IVWAX)
• Stadion Tactical Growth Fund (ETFDX)
• BBH Partner Fund - Select Short Term Assets (BBSTX)

Data Sources

ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.