Summary
Updated Aug 30, 2026
Claire Fraser files SEC Form 4 reports at Seres Therapeutics, Inc. (MCRB). 5 SEC Form 4 filings on record going back to 2025, most recently on 10 July 2026. Most recent open-market trade: sold $172K of BDX on 10 September 2025. Lifetime open-market sales: $338K.
Recent Transactions
3Every recent SEC Form 4 transaction Claire Fraser has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Claire Fraser go back to 2025: 5 primary Form 4 filings, an average of 2.5 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.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Claire Fraser files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Matthew R. Henn - $23K of MCRB open-market activity in the last 12 months
- Teresa L. Young - $19K of MCRB open-market activity in the last 12 months
- Eric D. Shaff - $9K of MCRB open-market activity in the last 12 months
- Thomas Desrosier - $3K of MCRB open-market activity in the last 12 months
- Kelly Brady - $735 of MCRB open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Claire Fraser?
Claire Fraser is a corporate insider of Seres Therapeutics, Inc. (MCRB). InsiderAlpha holds 5 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Claire Fraser submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Claire Fraser been buying or selling stock?
Recorded transactions: 0 open-market purchases and 2 open-market sales ($338K) across all tracked filings.
Where can I see all of Claire Fraser'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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