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DYN in the 13F filings

Dyne Therapeutics Inc · CUSIP 26818M108

Sector · Pharmaceuticals and biotechnologyTheme · Healthcare: biopharma and medtech· L3VLUP-definedTheme · Pharmaceutical preparations
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023
Quarter end
31 Mar 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
22
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 5 listed it in both
Shares listed
28,573,690
combined, among listed positions
Reported value
$518m
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 13 buyers (opened or added shares) and 14 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -501,155.

Managers listing DYN in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

22 of 22 holders

ActionFiling
Janus Henderson Group Ltd13,647,376$247m0.12%Trimmed-240,34618 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)8,908,980$162munder 0.1%Added+2,339,05915 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc2,328,373$42munder 0.1%Added+4,58415 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC834,176$15munder 0.1%Added+579,01615 May 2026 (the filing on sec.gov)
Artisan Partners LP619,457$11munder 0.1%Trimmed-30,23413 May 2026 (the filing on sec.gov)
Renaissance Technologies LLC533,600$9.7munder 0.1%Added+62,95514 May 2026 (the filing on sec.gov)
Invesco Ltd248,941$4.5munder 0.1%Added+111,25712 May 2026 (the filing on sec.gov)
Citadel Advisors LLC201,144$3.6munder 0.1%Trimmed-970,48015 May 2026 (the filing on sec.gov)
PDT Partners LLC182,986$3.3m0.20%Held015 May 2026 (the filing on sec.gov)
Millennium Management LLC158,548$2.9munder 0.1%Trimmed-745,84115 May 2026 (the filing on sec.gov)
Woodline Partners LP149,388$2.7munder 0.1%Added+28,60015 May 2026 (the filing on sec.gov)
AllianceBernstein LP135,940$2.7munder 0.1%Added+1,68015 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP108,724$2.0munder 0.1%Added+10,50915 May 2026 (the filing on sec.gov)
Man Group PLC95,682$1.7munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
AQR Capital Management LLC84,238$1.5munder 0.1%Added+13,57915 May 2026 (the filing on sec.gov)
Marshall Wace LLP83,147$1.5munder 0.1%Trimmed-593,83215 May 2026 (the filing on sec.gov)
Moore Capital Management LP78,765$1.4munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Tudor Investment Corp77,031$1.4munder 0.1%Trimmed-70,59015 May 2026 (the filing on sec.gov)
Wellington Management Group LLP48,882$886kunder 0.1%Added+1,78615 May 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP37,214$675kunder 0.1%Trimmed-120,75515 May 2026 (the filing on sec.gov)
Farallon Capital Management LLC10,000$181kunder 0.1%Held015 May 2026 (the filing on sec.gov)
Quantbot Technologies LP1,098$20kunder 0.1%Newnew13 May 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (3)

Exited (7)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
5 in Q3 2024 to 3 in Q2 2026

Tracked managers listing it, at least.

0246202120222023202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
DYN by quarter
QuarterHoldersReported valueBuyersSellers
Q3 20203$11mn.a.n.a.
Q4 20201$10mn.a.n.a.
Q1 20211$5.9mn.a.n.a.
Q2 20212$19mn.a.n.a.
Q3 20212$17mn.a.n.a.
Q4 20212$21mn.a.n.a.
Q1 20222$26mn.a.n.a.
Q2 20221$4.6mn.a.n.a.
Q3 20221$19mn.a.n.a.
Q4 20222$17mn.a.n.a.
Q1 20231$432kn.a.n.a.
Q2 20231$4.3mn.a.n.a.
Q3 20231$3.0mn.a.n.a.
Q4 20231$5.8m10
Q1 20244$123m31
Q2 20245$433m50
Q3 20245$392m32
Q4 20246$287m42
Q1 20255$141m42
Q2 20253$94m11
Q3 20255$228m31
Q4 20255$291m1514
Q1 20265$264m1314
Q2 20263$288m1211

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

DYN and LLY →DYN and JNJ →DYN and VRTX →Choose a stock to compare with DYN →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own DYN, latest filings →Back to the 13F Explorer →