Security key
746964105
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 8,428,600
- Total 13F value
- $16,632,224
- Share change
- -550,098
- SEC-reported price per share
- $1.98
- Number of holders
- 52
- Value change
- -$986,951
- Number of buys
- 17
- Number of sells
- 33
- Shares outstanding
- 29,802,568
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q3 2025
Institutions
52
Top holders
10
QTTB full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q4 2025
Q32 Bio Inc. SEC filings
Q32 Bio Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 746964105
Recent filing periods:
Ownership snapshot
Top reported holders of QTTB - Q32 Bio Inc. - Common Stock (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
PFIZER INC
Disclosed value leader
ORBIMED ADVISORS LLC
Comparable rows
2/15
Latest evidence
30 Jun 2025
13D/G
13F
3/4/5
Lead comparable stake: 2.3%
13 rows are not safely comparable across share classes.
13D/G row: PFIZER INC
Showing 1-6 of 15 holder rows.
Quick read
PFIZER INC leads the comparable SEC ownership view at 2.3%.
2 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens PFIZER INC's linked filing trail.
Comparable ownership
Top 2
PFIZER INC
2.3%
BRISTOL MYERS SQUIBB CO
1.6%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| PFIZER INC |
13D/G
13F
Pfizer Inc. (IRS Identification No.: 13-5315170) · Company
|
2.3%
Reported 13D/G
· 31 Dec 2024
|
$994,442
277,777 shares
|
$0 | 31 Dec 2024 |
| BRISTOL MYERS SQUIBB CO |
13D/G
|
1.6%
Reported 13D/G
· 31 Dec 2024
|
$312,381
200,244 shares
|
$0 | 31 Dec 2024 |
| Atlas Venture Fund X, L.P. |
3/4/5
10%+ Owner
|
—
denominator unverified
|
$1,194,801
2,092,106 shares
|
— | 25 Mar 2024 |
| ORBIMED ADVISORS LLC |
13F
Company
|
—
denominator unverified
|
$3,356,951
2,252,987 shares
|
— | 30 Jun 2025 |
| Atlas Venture Life Science Advisors, LLC |
13F
Company
|
—
denominator unverified
|
$3,117,238
2,092,106 shares
|
— | 30 Jun 2025 |
| W. Bradford Smith |
3/4/5
Chief Financial and Business Officer and Treasurer
|
—
mixed-class rows
|
$2,899,867
249,000 shares
mixed-class rows
|
— | 23 Feb 2023 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q3 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
52
Shares
8,428,600
Rows available
52
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q3 2025 vs Q1 2026 Across Filers
Q1 2026 holders
53
Q3 2025 holders
52
Holder diff
-1
| Investor | Q1 2026 Shares | Q3 2025 Shares | Share Diff | Share Chg % | Q1 2026 value | Q3 2025 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend