Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

Seres Therapeutics, Inc.

MCRB · Nasdaq · CIK 0001609809 · Healthcare · Biotechnology

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

16 Form 4 transaction lines observed in the same window
8 sales · 8 option, withholding, award, gift or other lines

Last qualifying purchase2022-07-05 · AFEYAN NOUBAR; Flagship Pioneering Inc.; Nutritional Health LTP Fund General Partner LLC; Nutritional Health LTP Fund, L.P. · $27.5M

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesModerate
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Brady KellySee Remarks
○▼○▼
Shaff Eric D.Director
○▼○▼
Henn Matthew RSee Remarks
○▼○▼
DesRosier ThomasSee Remarks
○▼○▼
● Purchase▼ Sale○ Other

—

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2022-07-05 · AFEYAN NOUBAR; Flagship Pioneering Inc.; Nutritional Health LTP Fund General Partner LLC; Nutritional Health LTP Fund, L.P..

Recent Form 4 activity

0Purchases
16Sales
22Other Form 4 lines
16SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING8 sale line(s) · context only
OTHER8 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
314,264
Previous report
301,344
Avg daily volume
61,066
Days to cover
5.2

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2022-07-05AFEYAN NOUBAR; Flagship Pioneering Inc.; Nutritional Health LTP Fund General Partner LLC; Nutritional Health LTP Fund, L.P.Purchase (P)Common Stock8,738,243USD 3.15USD 27,525,465SEC filing ↗

Form 4 evidence

38 transaction lines in the latest 365-day window; 190 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-17Shaff Eric D.Sale (S)Common Stock263USD 4.55USD 1,197SEC filing ↗
2026-08-17Henn Matthew RSale (S)Common Stock81USD 4.55USD 369SEC filing ↗
2026-08-17DesRosier ThomasSale (S)Common Stock82USD 4.55USD 373SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-17Shaff Eric D.Sale (S)Common Stock263USD 4.55USD 1,197SEC filing ↗
2026-08-17Henn Matthew RSale (S)Common Stock81USD 4.55USD 369SEC filing ↗
2026-08-17DesRosier ThomasSale (S)Common Stock82USD 4.55USD 373SEC filing ↗
2026-08-17Brady KellySale (S)Common Stock64USD 4.55USD 291SEC filing ↗
2026-08-15Shaff Eric D.Option exercise / conversion (M)Common Stock722USD —USD —SEC filing ↗
2026-08-15Henn Matthew ROption exercise / conversion (M)Common Stock238USD —USD —SEC filing ↗
2026-08-15DesRosier ThomasOption exercise / conversion (M)Common Stock245USD —USD —SEC filing ↗
2026-08-15Brady KellyOption exercise / conversion (M)Common Stock181USD —USD —SEC filing ↗
2026-05-18Shaff Eric D.Sale (S)Common Stock259USD 7.53USD 1,950SEC filing ↗
2026-05-18Henn Matthew RSale (S)Common Stock77USD 7.53USD 580SEC filing ↗
2026-05-18DesRosier ThomasSale (S)Common Stock79USD 7.53USD 595SEC filing ↗
2026-05-18Brady KellySale (S)Common Stock59USD 7.53USD 444SEC filing ↗
2026-05-15Shaff Eric D.Option exercise / conversion (M)Common Stock722USD —USD —SEC filing ↗
2026-05-15Henn Matthew ROption exercise / conversion (M)Common Stock238USD —USD —SEC filing ↗
2026-05-15DesRosier ThomasOption exercise / conversion (M)Common Stock244USD —USD —SEC filing ↗
2026-05-15Brady KellyOption exercise / conversion (M)Common Stock180USD —USD —SEC filing ↗
2026-02-15Young Teresa L.Sale (S)Common Stock75USD 8.47USD 635SEC filing ↗
2026-02-15Young Teresa L.Option exercise / conversion (M)Common Stock231USD —USD —SEC filing ↗
2026-02-15Shaff Eric D.Sale (S)Common Stock259USD 8.47USD 2,194SEC filing ↗
2026-02-15Shaff Eric D.Option exercise / conversion (M)Common Stock723USD —USD —SEC filing ↗
2026-02-15Henn Matthew RSale (S)Common Stock89USD 8.47USD 754SEC filing ↗
2026-02-15Henn Matthew ROption exercise / conversion (M)Common Stock239USD —USD —SEC filing ↗
2026-02-15DesRosier ThomasSale (S)Common Stock78USD 8.47USD 661SEC filing ↗
2026-02-15DesRosier ThomasOption exercise / conversion (M)Common Stock244USD —USD —SEC filing ↗
2025-11-15Young Teresa L.Sale (S)Common Stock1,042USD 17.30USD 18,027SEC filing ↗
2025-11-15Young Teresa L.Option exercise / conversion (M)Common Stock4,228USD —USD —SEC filing ↗
2025-11-15Shaff Eric D.Sale (S)Common Stock217USD 17.30USD 3,754SEC filing ↗
2025-11-15Shaff Eric D.Option exercise / conversion (M)Common Stock721USD —USD —SEC filing ↗
2025-11-15Henn Matthew RSale (S)Common Stock1,257USD 17.30USD 21,746SEC filing ↗
2025-11-15Henn Matthew ROption exercise / conversion (M)Common Stock4,236USD —USD —SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerMCRB
CIK0001609809
SectorHealthcare
IndustryBiotechnology Yahoo Finance
SEC SIC2834 Pharmaceutical Preparations
ExchangeNasdaq

Data coverage

Local Form 4 history190 transaction lines from 2020-01-26 to 2026-08-17
2 P purchase lines · 72 S sale lines · 116 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.