Security key
26818M108
- Security type / class
- Equity / Common Stock
- Shares outstanding
- 164,426,217
- Total 13F shares
- 187,846,236
- Share change
- +9,476,431
- Total reported value
- $3,402,448,596
- Put/Call ratio
- 625%
- Reported price per share
- $18.13
- Number of holders
- 227
- Value change
- +$164,547,456
- Number of buys
- 135
- Number of sells
- 105
Security identity
Holder snapshot
Report period
Q1 2026
Institutions
227
Top holders
10
DYN full security history
Ownership snapshot
Full 13F holder table
Previous quarter: Q4 2025
Dyne Therapeutics, Inc. SEC filings
Dyne Therapeutics, Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 26818M108
Recent filing periods:
Ownership snapshot
Top reported holders of DYN - Dyne Therapeutics, 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.
Lead holder
T. Rowe Price Investment ...
13D/G signal
T. Rowe Price Investment ...
Evidence rows
15
Latest as of
31 Mar 2026
13D/G
13F
3/4/5
Lead comparable stake: 19%
13D/G row: T. Rowe Price Investment Management, Inc.
Showing 1-6 of 15 holder rows.
Rank 1 holder
T. Rowe Price Investment Management, Inc.
13D/G
13F
- Ownership
- 19%
- Position
- $557.22M
Rank 2 holder
JANUS HENDERSON GROUP PLC
13F
13D/G
- Ownership
- 8.3%
- Position
- $271.6M
Rank 3 holder
BlackRock, Inc.
13F
13D/G
- Ownership
- 5.8%
- Position
- $218.89M
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| T. Rowe Price Investment Management, Inc. |
13D/G
13F
Company
|
19%
|
$557,222,998
30,785,801 shares
|
+$76,153,288 | 31 Mar 2026 |
| JANUS HENDERSON GROUP PLC |
13F
13D/G
Company
|
8.3%
from 13D/G
|
$271,603,659
13,887,722 shares
|
— | 31 Dec 2025 |
| BlackRock, Inc. |
13F
13D/G
Company
|
5.8%
from 13D/G
|
$218,892,793
11,190,838 shares
|
— | 31 Dec 2025 |
| FMR LLC |
13D/G
13F
Company
|
5.4%
|
$161,252,536
8,908,980 shares
|
+$67,217,717 | 31 Mar 2026 |
| Forbion Capital Fund IV Cooperatief U.A. |
13D/G
ForDyne B.V.
|
4.8%
|
$60,000,055
5,400,545 shares
|
$0 | 31 Mar 2025 |
| Atlas Venture Fund XI, L.P. |
3/4/5
13D/G
10%+ Owner · Atlas Venture Associates XI, L.P.
|
4%
from 13D/G
|
$165,705,095
6,562,578 shares
|
— | 26 Feb 2024 |
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 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
227
Shares
187,846,236
Rows available
227
| Investor | Option | Weight % | Change % | Reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* 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 failed the local validity check.
Compare Q1 2026 vs Q4 2025 Across Filers
Q4 2025 holders
231
Q1 2026 holders
227
Holder diff
-4
| Investor | Q4 2025 Shares | Q1 2026 Shares | Share Diff | Share Chg % | Q4 2025 value | Q1 2026 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend