Summary
Updated Aug 31, 2026
James O. Yost files SEC Form 4 reports at MFS CALIFORNIA MUNICIPAL FUND (CCA). 6 SEC Form 4 filings on record, most recently on 1 October 2024.
Trading Pattern
InsiderAlpha's records for James O. Yost go back to 2024: 6 primary Form 4 filings, an average of 2.0 per year. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Most Active Insiders Right Now
James O. Yost has no co-filers on record, so these are insiders with the largest open-market activity across the market in the last 90 days.
- Coliseum Capital Management, LLC - $124.20M of UTI open-market activity in the last 90 days
- Andrew Stafman - $123.54M of TWLO open-market activity in the last 90 days
- Vyacheslav Kim - $119.18M of KSPI open-market activity in the last 90 days
- Olivier Pomel - $118.60M of DDOG open-market activity in the last 90 days
- Patrizio Vinciarelli - $118.12M of VICR open-market activity in the last 90 days
- Ronda E. Stryker - $117.78M of SYK open-market activity in the last 90 days
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is James O. Yost?
James O. Yost is a corporate insider of MFS CALIFORNIA MUNICIPAL FUND (CCA). InsiderAlpha holds 6 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did James O. Yost last file a Form 4?
The most recent primary Form 4 on record is dated 1 October 2024, one of 6 filings going back to 2024.
Where can I see all of James O. Yost's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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