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

Generation Bio Co.

GBIO · — · CIK 0001733294 · Healthcare

INSIDER SIGNAL

No active buy signal

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

0 Form 4 transaction lines observed in the same window
0 sales · 0 option, withholding, award, gift or other lines

Last qualifying purchase2025-01-13 · Quinn Anthony G. · $82.5K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesNone
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

No Form 4 transaction event is present in the current 180-day window.

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: 2025-01-13 · Quinn Anthony G..

Recent Form 4 activity

0Purchases
0Sales
34Other Form 4 lines
19SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING0 sale line(s) · context only
OTHER0 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

The FINRA report lists no short interest for this ticker.

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
2025-01-13Quinn Anthony G.Purchase (P)Common Stock85,000USD 0.97USD 82,450SEC filing ↗
2025-01-10Quinn Anthony G.Purchase (P)Common Stock125,791USD 0.96USD 120,759SEC filing ↗
2023-12-08Appelhans DanniellePurchase (P)Common Stock8,000USD 1.79USD 14,339SEC filing ↗
2023-12-04Appelhans DanniellePurchase (P)Common Stock12,000USD 1.50USD 18,000SEC filing ↗
2023-12-04Rowland Charles A JrPurchase (P)Common Stock150,000USD 1.50USD 225,000SEC filing ↗
2023-12-01Rowland Charles A JrPurchase (P)Common Stock192,960USD 1.31USD 252,778SEC filing ↗
2023-12-01Quinn Anthony G.Purchase (P)Common Stock88,495USD 1.41USD 124,778SEC filing ↗
2023-12-01Nicholson Donald WilliamPurchase (P)Common Stock100,000USD 1.44USD 144,000SEC filing ↗
2022-09-19Rowland Charles A JrPurchase (P)Common Stock15,750USD 5.26USD 82,845SEC filing ↗
2022-09-16Rowland Charles A JrPurchase (P)Common Stock33,481USD 5.48USD 183,476SEC filing ↗
2022-09-15Rowland Charles A JrPurchase (P)Common Stock17,147USD 5.41USD 92,765SEC filing ↗
2022-09-14Rowland Charles A JrPurchase (P)Common Stock5,600USD 5.30USD 29,680SEC filing ↗
2022-09-13Rowland Charles A JrPurchase (P)Common Stock18,784USD 5.20USD 97,677SEC filing ↗
2022-03-10Nicholson Donald WilliamPurchase (P)Common Stock8,126USD 4.71USD 38,273SEC filing ↗
2022-03-09Nicholson Donald WilliamPurchase (P)Common Stock2,293USD 4.79USD 10,983SEC filing ↗

Form 4 evidence

34 transaction lines in the latest 365-day window; 483 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-02-09Stehman-Breen CatherineU (U)Common Stock4,752USD —USD —SEC filing ↗
2026-02-09Rowland Charles A JrU (U)Common Stock53,475USD —USD —SEC filing ↗
2026-02-09Rhodes Jason PU (U)Common Stock827,946USD —USD —SEC filing ↗
Show recent Form 4 evidence (26 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-02-09Stehman-Breen CatherineU (U)Common Stock4,752USD —USD —SEC filing ↗
2026-02-09Rowland Charles A JrU (U)Common Stock53,475USD —USD —SEC filing ↗
2026-02-09Rhodes Jason PU (U)Common Stock827,946USD —USD —SEC filing ↗
2026-02-09Quinn Anthony G.U (U)Common Stock37,211USD —USD —SEC filing ↗
2026-02-09Nicholson Donald WilliamU (U)Common Stock21,357USD —USD —SEC filing ↗
2026-02-09MCDONOUGH GEOFFU (U)Common Stock188,638USD —USD —SEC filing ↗
2026-02-09Howze YalondaU (U)Common Stock3,759USD —USD —SEC filing ↗
2026-02-09Cooper Ronald Harold WilfredU (U)Common Stock950USD —USD —SEC filing ↗
2026-02-09Conway Kevin JohnU (U)Common Stock2,072USD —USD —SEC filing ↗
2026-02-09Christensen GustavU (U)Common Stock13,142USD —USD —SEC filing ↗
2026-02-09Appelhans DannielleU (U)Common Stock1,999USD —USD —SEC filing ↗
2026-02-09ATLAS VENTURE ASSOCIATES X, L.P.; Atlas Venture Associates Opportunity I, L.P.; Atlas Venture Associates Opportunity I, LLC; Atlas Venture Associates X, LLC; Atlas Venture Fund X, L.P.; Atlas Venture Opportunity Fund I, L.P.U (U)Common Stock827,946USD —USD —SEC filing ↗
2026-02-02MCDONOUGH GEOFFOption exercise / conversion (M)Common Stock1,582USD —USD —SEC filing ↗
2026-02-02MCDONOUGH GEOFFTax withholding (F)Common Stock550USD 5.64USD 3,102SEC filing ↗
2026-02-02Howze YalondaOption exercise / conversion (M)Common Stock1,673USD —USD —SEC filing ↗
2026-02-02Howze YalondaTax withholding (F)Common Stock495USD 5.64USD 2,792SEC filing ↗
2026-02-02Conway Kevin JohnOption exercise / conversion (M)Common Stock235USD —USD —SEC filing ↗
2026-02-02Conway Kevin JohnTax withholding (F)Common Stock72USD 5.64USD 406SEC filing ↗
2026-01-15MCDONOUGH GEOFFOption exercise / conversion (M)Common Stock395USD —USD —SEC filing ↗
2026-01-15MCDONOUGH GEOFFTax withholding (F)Common Stock137USD 5.64USD 773SEC filing ↗
2026-01-15Howze YalondaOption exercise / conversion (M)Common Stock335USD —USD —SEC filing ↗
2026-01-15Howze YalondaTax withholding (F)Common Stock99USD 5.64USD 558SEC filing ↗
2026-01-15Conway Kevin JohnOption exercise / conversion (M)Common Stock59USD —USD —SEC filing ↗
2026-01-15Conway Kevin JohnTax withholding (F)Common Stock17USD 5.64USD 96SEC filing ↗
2025-10-31MCDONOUGH GEOFFOption exercise / conversion (M)Common Stock659USD —USD —SEC filing ↗
2025-10-31MCDONOUGH GEOFFTax withholding (F)Common Stock293USD 5.51USD 1,614SEC 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 · —
TickerGBIO
CIK0001733294
SectorHealthcare
Industry— Yahoo Finance
SEC SIC2834 Pharmaceutical Preparations
Exchange—

Data coverage

Local Form 4 history483 transaction lines from 2020-06-16 to 2026-02-09
25 P purchase lines · 167 S sale lines · 291 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.