13F reference period
n/a
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
Shares (Excl. Options)
n/a
Price
$5.34
The headline uses the Q2 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended.
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- Security type / class
- Equity / COMMON STOCK
- Symbol
- GBIO
- Shares outstanding
- 6,762,613
- SEC-reported price per share
- $5.34
- Insider filing price
- $5.34
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Filing notes and source
Key facts
- GBIO - Generation Bio Co. - COMMON STOCK is tracked under CUSIP 37148K209.
- 13F reference-period holder data is not available.
- 3 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder data for the Q2 2026 reference period is not available.
- Available periods remain in the history table; they do not substitute for the headline period.
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 Schedule 13D/G
Open SEC evidence
Ownership context comes from Schedule 13D/G and available holder history for this CUSIP.
Security key
37148K209
13F reference period
n/a
13F holders
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 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
4
Headline period
n/a
Rows shown
1-4 of 4