Latest Period
Q1 2026
Security Snapshot
Generation Bio Co. - COMMON STOCK (GBIO) Institutional Ownership
CUSIP: 37148K209
13F Institutional Holders and Ownership History from Q2 2025 to Q1 2026
Institutions Reporting
0
Shares (Excl. Options)
0
Price
$5.34
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- Security type / class
- Equity / COMMON STOCK
- Symbol
- GBIO
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 0
- Total 13F value
- $0
- Share change
- -4,082,072
- Value change
- -$23,184,145
- Number of holders
- 0
- Shares outstanding
- 6,762,613
- SEC-reported price per share
- $5.34
- Insider filing price
- $5.34
Latest holder snapshot
4 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- GBIO - Generation Bio Co. - COMMON STOCK is tracked under CUSIP 37148K209.
- 0 institutions reported positions in Q1 2026.
- 3 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 45 to 0 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $24,490,431 to $0.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 0 institutions filings for Q1 2026.
Security key
37148K209
Latest holder period
Q1 2026
13F holders
0
13D/G owners
3
CIK / CUSIP context first
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 37148K209:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
3
Security
GBIO
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| SymBiosis Capital Partners, LLC | 6.3% | $2,582,018 | 421,926 | SymBiosis Capital Partners, LLC | 30 Sep 2025 | |||
| RENAISSANCE TECHNOLOGIES LLC | 4.3% | -17% | $1,576,125 | -$310,437 | 287,614 | -16% | Renaissance Technologies LLC | 31 Dec 2025 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 3.1% | -61% | $1,148,833 | -$2,011,971 | 209,641 | -64% | T. Rowe Price Associates, Inc. | 31 Dec 2025 |
As of 31 Mar 2026, 0 institutional investors reported holding 0 shares of Generation Bio Co. - COMMON STOCK (GBIO). This represents 0% of the company’s total 6,762,613 outstanding shares.
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
4
Latest
Q1 2026
Rows shown
1-4 of 4