The County Board of Supervisors created this pool to invest County assets. Public agencies can also invest in the Pool. The Pool has received the highest rating, "AAAf/S1," from Fitch Ratings Inc. Fitch is a nationally recognized, independent credit rating agency. The "AAAf" rating means there's strong protection against credit losses from the Pool’s investments. The "S1" rating means:
- The Pool has a low sensitivity to changing market conditions
- The Pool has a low risk profile and conservative investment policies.
The Pool includes monies deposited by mandatory and voluntary participants. Mandatory participants include:
- The County of Marin
- K-12 school districts
- Community college districts
- Special districts
Some agencies are not required to invest in the Pool. These agencies do so only as an optional investment. These voluntary participants include cities and various special districts. The Treasurer encourages voluntary participants to use the Pool as a long-term investment vehicle.
The main objectives of the Investment Pool are to:
- Preserve capital
- Meet the liquidity needs of Pool participants
- Achieve an investment return within the guidelines of the Investment Policy.
The management of the Pool follows statutory provisions outlined in the California Government Code.
Monthly Investment Reports: Last 12 Months
Every month, the Treasurer's Office creates a report that shows the Pool's current investments.
The documents in this list may not work with all assistive technology and are being remediated. For alternative formats, please email Jennifer Mendoza or phone 415-473-6154. To use the California relay service, dial 711.
- February 2026 Investment Report (0.85 MB) — Board approved April 14, 2026
- January 2026 Investment Report (0.98 MB) — Board approved April 7, 2026
- December 2025 Investment Report (0.91 MB) — Board approved February 24, 2026
- November 2025 Investment Report (0.42 MB) — Board approved January 27, 2026
- October 2025 Investment Report (0.77 MB) — Board approved December 16, 2025.
- September 2025 Investment Report (0.77 MB) — Board approved November 18, 2025
- August 2025 Investment Report (0.78 MB) — Board approved October 14, 2025
- July 2025 Investment Report (0.54 MB) — Board approved September 30, 2025
- June 2025 Investment Report (0.57 MB) — Board approved August 19, 2025
- May 2025 Investment Report (0.54 MB) — Board approved July 17, 2025
- April 2025 Investment Report (0.68 MB) — Board approved June 10, 2025
- March 2025 Investment Report (0.63 MB) — Board approved May 20, 2025
Year-End Investment Reports: Prior Fiscal Years
- June 2025 Investment Report (0.57 MB) — Board approved August 19, 2025
- June 2024 Investment Report (0.60 MB) — Board approved August 20, 2024
- June 2023 Investment Report (0.89 MB) — Board approved August 22, 2023
- June 2022 Investment Report (0.85 MB) — Board approved August 16, 2022
- June 2021 Investment Report (9.16 MB) — Board approved August 24, 2021
- June 2020 Investment Report (0.77 MB) — Board approved August 18, 2020
- June 2019 Investment Report (8.26 MB) — Board approved August 6, 2019
Annual Investment Rating Reports
These reports are written by Fitch Ratings Inc. They explain why the Pool has a "AAA" rating.
- Fitch Ratings Report: Marin County Investment Pool June 30, 2025 (0.07 MB) — Issued August 21, 2025
- Fitch Ratings Report: Marin County Investment Pool June 30, 2024 (0.10 MB) — Issued September 30, 2024
- Fitch Ratings Report: Marin County Investment Pool June 30, 2023 (0.09 MB) — Issued September 8, 2023
- Fitch Ratings Report: Marin County Investment Pool June 30, 2022 (0.09 MB) — Issued September 6, 2022
- Fitch Ratings Report: Marin County Investment Pool June 30, 2021 (0.08 MB) — Issued September 2, 2021
- Fitch Ratings Report: Marin County Investment Pool June 30, 2020 (0.12 MB) — Issued September 24, 2020
- Fitch Ratings Report: Marin County Investment Pool June 30, 2019 (0.27 MB) — Issued September 27, 2019