DYN down 17.0% on Sep 9 2026 with no filing that explains it
DYN-17.0%on Wed Sep 9 2026
Dyne Therapeutics, Inc. Common Stock was down 17.0% on the day at $20.16, ranked #12 on 7.9× its usual five-minute volume, when TapeRank recorded this unexplained move at 04:07 ET during the pre-market session.
WHAT THE ROW LOOKED LIKE
LAST20.16
DAY▼ 17.0%
5 MIN▼ 0.79%
5M RVOL7.9×
5M $VOL$207K
FLOAT*186.7M
RANK#12
SESSIONPRE-MARKET
* FLOAT IS SHARES OUTSTANDING; TRUE FREE FLOAT IS NOT AVAILABLE
AI VERDICT
UNEXPLAINEDCONFIDENCE4/5
DYN is down 17% premarket on elevated volume with no news or filings that explain a move of this magnitude. The only recent filings are routine Form 4 insider transactions, which do not typically drive double-digit price swings.
WHYA 17% premarket decline against nothing but routine Form 4 insider filings is a large move with essentially no disclosed catalyst behind it.
ANALYZED 04:07 ET · <1 MIN AGO · ANTHROPIC/CLAUDE-SONNET-5
FILINGS · 24H BEFORE THE MOVE
- TUE 12:15 ET4 — Insider transactionSEC 4
- TUE 12:14 ET4 — Insider transactionSEC 4
- TUE 12:13 ET4 — Insider transactionSEC 4
SESSION LEVELS AT CAPTURE
VWAP20.30
HOD20.91
LOD17.00
OR HIGH—
OR LOW—
PREV CLOSE24.28
PM HIGH20.33
PM LOW20.16
GAP▼ 29.65%
— MEANS THE LEVEL DID NOT EXIST YET AT THAT INSTANT, NOT ZERO