Siren, L.L.C. DYN — Dyne Therapeutics Inc

Ownership history in Siren, L.L.C.  ·  6 quarters on record

AI Ownership Summary

Siren, L.L.C. reported Dyne Therapeutics Inc (DYN) in 6 quarterly 13F filings from 2024 Q3 through 2025 Q4. Peak portfolio weight reached 2.38% in 2025 Q2. The latest visible filing shows DYN at 2.04% of the fund.

This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings.

What this DYN ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was Siren, L.L.C.'s position in Dyne Therapeutics Inc, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.

Freshest filing
Latest Reported Filing
2025 Q4

DYN was reported at 2.04% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
2.38% in 2025 Q2

Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.

Time in book
Holding Window
2024 Q3 to 2025 Q4

Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.

Decision context
Why It Matters
Position size beats headlines

Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.

DYN stock page Siren, L.L.C. fund profile Siren, L.L.C. full holdings
How Siren, L.L.C. held DYN — position size vs. price
% of Fund (quarterly)    DYN price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 6 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2025 Q4 REDUCED 25.9% -7.3% ✅ 3,502,941 -1,226,233 -25.9% 2.04% $68.5M 2026-02-14 (Est.) $15.54
2025 Q3 REDUCED — — — 4,729,174 -107,263 -2.2% 2.34% $59.8M 2025-11-13 $18.83
2025 Q2 ADDED — — — 4,836,437 +2,118,450 +77.9% 2.38% $46.0M 2025-08-13 $12.24
2025 Q1 ADDED — — — 2,717,987 +1,370,531 +101.7% 1.62% $28.4M 2025-05-14 $11.70
2024 Q4 ADDED — — — 1,347,456 +212,792 +18.8% 1.40% $31.7M 2025-02-14 $13.91
2024 Q3 INITIATED — — — 1,134,664 — — 2.04% $40.8M 2024-11-13 $34.13

🏢 Other funds also holding DYN

As of 2026 Q1 — sorted by position size

Aegis Wealth Management LLC 1.4% Darwin Wealth Management, LLC 3Y 7Y 0.87% Elevate Capital Advisors, LLC 0.29% PSP Research LLC 0.26% STONERIDGE INVESTMENT PARTNERS LLC 3Y 7Y 0.22% ARCADIA INVESTMENT MANAGEMENT CORP/MI 3Y 7Y 0.15% Z3 Capital Partners, LLC 0.07% PROFUND ADVISORS LLC 3Y 7Y 0.05% WASATCH ADVISORS LP 3Y 7Y 0.05% SEVEN GRAND MANAGERS, LLC 3Y 0.04%

FAQ About Siren, L.L.C. and DYN

These are the practical questions this page is built to answer before you even open the full history table.

How long has Siren, L.L.C. reported owning DYN?

Siren, L.L.C. reported DYN across 6 quarterly 13F filings, from 2024 Q3 through 2025 Q4.

What was the largest reported DYN position in Siren, L.L.C.'s portfolio?

The largest reported portfolio weight for DYN was 2.38% in 2025 Q2.

What is the latest reported DYN position on this page?

The most recent filing on this page is 2025 Q4, when Siren, L.L.C. reported 3,502,941 shares, equal to 2.04% of portfolio, with an estimated market value of $68.5M.

What does the chart on this DYN ownership page compare?

The chart compares Siren, L.L.C.'s quarterly DYN portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.

How well did Siren, L.L.C. time their DYN position?

Based on 13F filing dates vs. subsequent DYN price moves, Siren, L.L.C. correctly timed 3 out of 5 reported position changes (60%). The annualised alpha on DYN relative to SPY over the holding period was -52.5%.

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