Security key
746964105
- Security type / class
- Equity / COMMON STOCK
- Total 13F shares
- 7,430,290
- Total 13F value
- $125,894,701
- Share change
- +7,430,290
- SEC-reported price per share
- $17.04
- Number of holders
- 38
- Value change
- +$125,894,701
- Number of buys
- 38
- Shares outstanding
- 23,724,063
Holder snapshot
5 signals
Security identity
1 source field
Report period
Q1 2024
Institutions
38
Top holders
10
QTTB full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q2 2024
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
Atlas Venture Fund X, L.P.
Disclosed value leader
W. Bradford Smith
Comparable rows
0/15
Latest evidence
25 Mar 2024
3/4/5
Highest disclosed value: $2,899,867
15 rows are not safely comparable across share classes.
Showing 1-6 of 15 holder rows.
Quick read
W. Bradford Smith has the largest disclosed position value at $2.9M.
0 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.
Disclosed position value
Top 5
Atlas Venture Fund X, L.P.
$1.19M
W. Bradford Smith
$2.9M
Michael L. Blum
$1.42M
Timothy P. Kelly
$384K
Alise Reicin
$308.7K
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Atlas Venture Fund X, L.P. |
3/4/5
10%+ Owner
|
—
class O/S missing
|
$1,194,801
2,092,106 shares
|
— | 25 Mar 2024 |
| 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 |
| Michael L. Blum |
3/4/5
Chief Commercial Officer
|
—
mixed-class rows
|
$1,415,233
121,000 shares
mixed-class rows
|
— | 23 Feb 2023 |
| Timothy P. Kelly |
3/4/5
Chief Operating Officer
|
—
mixed-class rows
|
$383,965
33,000 shares
mixed-class rows
|
— | 24 Feb 2022 |
| Alise Reicin |
3/4/5
Director
|
—
class O/S missing
|
$308,660
23,000 shares
|
— | 14 Jun 2023 |
| Jeffrey V Poulton |
3/4/5
Director
|
—
class O/S missing
|
$308,660
23,000 shares
|
— | 14 Jun 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 Q1 2024
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
38
Shares
7,430,290
Rows available
38
| 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 Q1 2024 vs Q4 2025 Across Filers
Q4 2025 holders
51
Q1 2024 holders
38
Holder diff
-13
| Investor | Q4 2025 Shares | Q1 2024 Shares | Share Diff | Share Chg % | Q4 2025 value | Q1 2024 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend