Transaction · 0001193125-26-415584

Posner Brian S

Posner Brian S, DIR, reported an open-market or private purchase at Dyne Therapeutics, Inc. involving 2500.000000 shares for an estimated $40000.00. Reported holdings after the transaction were 27000.000000 shares. A 10b5-1 reference was not detected in the stored filing text.

Open-market buySEC transaction code PDIR
DYNDyne Therapeutics, Inc.
Filing timeOct 06
Trade dateOct 02, 2026
Filing · SECView on SEC
InsiderProfile
% of reported position traded10.2%Shares purchased ÷ (holdings after − shares purchased). Estimated position before: 24,500 shares.

Row-level estimate for this security and ownership context, not the insider’s complete portfolio. Joint ownership, other transactions in the filing, amendments and footnotes can affect interpretation.

Price performance since filing

Close on the filing date, the pre-filing context, and the forward return at standard windows
Price at filing
$15.40
Pre-filing
1mo ago +63.2%1w ago +4.1%1d ago +2.7%
Returns since
7d30d90d180d1y

DYN price since this filing

30 days of pre-filing context and vertical markers at the filing date plus 7d / 30d / 90d / 180d / 1y afterwards
DYN since 2026-10-06Filed yesterday · 1 day of post-filing data
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Filing datePost-filing windows (7d, 30d, 90d, 180d, 1y)30 days of pre-filing context

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
Buy
Code P
Identifier
0001193125-26-415584
Common Stock
Transaction date
Oct 02, 2026
Filed Oct 06, 2026, 08:15 PM · 4d delay
Shares
2.50k sh
$16.00 per share
Estimated value
$40.0k
Computed from shares × price
Holdings after
27.0k sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $100kLarge $1.00M
Director Buy Direct Ownership
+24score
Filing-only score

+24

Compact filing score computed from stored Form 4 facts. Version v1.

Positive filing signal

This filing has a modest positive filing-only score. Treat it as a useful flag for review, not as a buy signal.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

No officer title

Officer NoDirector Yes10% NoOther No
Footnotes & amended

No footnotes recorded.

Original filing · 0001193125-26-415584
Related transactions

0 other filings

Same reporting owner
Recent company activity

0 recent txs

DYN