Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

Dyne Therapeutics, Inc.

DYN · Nasdaq · CIK 0001818794 · Healthcare · Biotechnology

INSIDER SIGNAL

No active buy signal

5 qualifying P purchase groups
in the current 180-day scoring window

107 Form 4 transaction lines observed in the same window
101 sales · 1 option, withholding, award, gift or other lines

Last qualifying purchase2026-10-02 · Posner Brian S · $40.0K

WHY NO ACTIVE SIGNAL?

Purchase activityPresent
Recent buying5 qualifying line group(s)
Recent salesHigh
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Rhodes Jason PDirector
▼▼▼▼▼▼▼▼▼
Kerr DouglasChief Medical Officer
▼▼▼▼▼
Kersten DirkDirector
▼▼▼▼▼
Posner Brian SDirector
●●●●●
Friedl-Naderer JohannaChief Commercial Officer
▼▼▼▼
Cox JohnCEO & President
▼▼▼
● Purchase▼ Sale○ Other

Showing the six most active owners; 1 additional owner(s) remain in Form 4 evidence.

Purchase breadth & concentration

QUALIFYING BUYERS1
PURCHASE CONCENTRATION100%Largest buyer: Posner Brian S · $196.8K
CLUSTER BUYING · 15D1 insiderPeak activity: 2026-05-20–2026-06-03

Roles in the peak window: Director. Concentration uses priced qualifying P lines only and does not change the saved score.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2026-10-02 · Posner Brian S.

Recent Form 4 activity

7Purchases
122Sales
5Other Form 4 lines
50SEC filings · 365 days
BUYING5 qualifying P line(s) · 180 days
SELLING101 sale line(s) · context only
OTHER1 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context provides additional background on recent price performance and risk. It does not affect the Insider Signal.

Price performance

1M
-9.7%
3M
-29.6%
6M
-10.9%
12M
+14.3%

Volatility & liquidity

Volatility
80.2%
Beta
—
Avg daily value
USD 48.2M

Valuation

Market cap
USD 3.1B
P/E
—

Fundamentals

Profit margin
—
ROE
-0.0%
Industry
Biotechnology

Market data

Price data up to: 2026-10-09 · Price source: OpenBB/yfinance; volume from price cache (yfinance) · From SEC filings: Market cap, ROE · Fiscal year ended: 2025-12-31 · Market cap is the shares outstanding stated on the filing cover multiplied by the latest close. Share count date: 2026-07-24 · Status: PASS

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
25,977,390
Previous report
23,381,047
Avg daily volume
2,882,693
Days to cover
9.0

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-02Posner Brian SPurchase (P)Common Stock2,500USD 16.00USD 40,000SEC filing ↗
2026-06-08Posner Brian SPurchase (P)Common Stock2,000USD 16.94USD 33,880SEC filing ↗
2026-06-03Posner Brian SPurchase (P)Common Stock2,500USD 17.48USD 43,700SEC filing ↗
2026-05-26Posner Brian SPurchase (P)Common Stock2,000USD 18.21USD 36,420SEC filing ↗
2026-05-20Posner Brian SPurchase (P)Common Stock2,500USD 17.12USD 42,800SEC filing ↗
2026-03-11Posner Brian SPurchase (P)Common Stock2,000USD 19.35USD 38,700SEC filing ↗
2026-03-06Posner Brian SPurchase (P)Common Stock3,000USD 15.06USD 45,180SEC filing ↗
2025-07-14Cox JohnPurchase (P)Common Stock100,000USD 9.11USD 911,000SEC filing ↗
2024-09-04Cox JohnPurchase (P)Common Stock8,000USD 33.04USD 264,304SEC filing ↗
2024-01-09Kersten DirkPurchase (P)Common Stock1,714,285USD 17.50USD 29,999,988SEC filing ↗
2022-12-12Rhodes Jason PPurchase (P)Common Stock934,581USD 10.70USD 10,000,017SEC filing ↗
2022-12-12Atlas Venture Associates Opportunity I, L.P.; Atlas Venture Associates Opportunity I, LLC; Atlas Venture Associates Opportunity II, LLC; Atlas Venture Associates Opportunity II, LP; Atlas Venture Associates XI, L.P.; Atlas Venture Associates XI, LLC; Atlas Venture Fund XI, L.P.; Atlas Venture Opportunity Fund I, L.P.; Atlas Venture Opportunity Fund II, L.P.Purchase (P)Common Stock934,581USD 10.70USD 10,000,017SEC filing ↗
2020-09-21VIDA VENTURES II-A, LLC; VV Manager II, LLC; Vida Ventures II, LLCPurchase (P)Common Stock815,000USD 19.00USD 15,485,000SEC filing ↗
2020-09-21Logos Global Management LPPurchase (P)Common Stock700,000USD 19.00USD 13,300,000SEC filing ↗
2020-09-21Kolchinsky Peter; RA CAPITAL MANAGEMENT, L.P.; Shah Rajeev M.Purchase (P)Common Stock660,000USD 19.00USD 12,540,000SEC filing ↗

Form 4 evidence

134 transaction lines in the latest 365-day window; 614 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-02Posner Brian SPurchase (P)Common Stock2,500USD 16.00USD 40,000SEC filing ↗
2026-09-08Kerr DouglasSale (S)Common Stock1,290USD 18.88USD 24,355SEC filing ↗
2026-09-08Friedl-Naderer JohannaSale (S)Common Stock185USD 18.88USD 3,493SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-02Posner Brian SPurchase (P)Common Stock2,500USD 16.00USD 40,000SEC filing ↗
2026-09-08Kerr DouglasSale (S)Common Stock1,290USD 18.88USD 24,355SEC filing ↗
2026-09-08Friedl-Naderer JohannaSale (S)Common Stock185USD 18.88USD 3,493SEC filing ↗
2026-09-08Cox JohnSale (S)Common Stock5,658USD 18.88USD 106,823SEC filing ↗
2026-09-04Kerr DouglasSale (S)Common Stock3,745USD 24.35USD 91,191SEC filing ↗
2026-09-04Friedl-Naderer JohannaSale (S)Common Stock900USD 24.35USD 21,915SEC filing ↗
2026-08-14Rhodes Jason PSale (S)Common Stock2,160,516USD 25.00USD 54,012,900SEC filing ↗
2026-08-13Rhodes Jason PSale (S)Common Stock426,412USD 26.20USD 11,171,994SEC filing ↗
2026-08-13Lucera ErickSale (S)Common Stock1,797USD 26.28USD 47,225SEC filing ↗
2026-08-13Kerr DouglasSale (S)Common Stock1,556USD 26.28USD 40,892SEC filing ↗
2026-08-13Friedl-Naderer JohannaSale (S)Common Stock226USD 26.28USD 5,939SEC filing ↗
2026-08-13Cox JohnSale (S)Common Stock4,986USD 26.28USD 131,032SEC filing ↗
2026-07-27Kersten DirkSale (S)Common Stock261,460USD 25.51USD 6,670,140SEC filing ↗
2026-07-07Rhodes Jason PSale (S)Common Stock297,211USD 23.26USD 6,913,822SEC filing ↗
2026-07-06Rhodes Jason PSale (S)Common Stock480,240USD 22.79USD 10,944,670SEC filing ↗
2026-06-29Rhodes Jason PSale (S)Common Stock195,427USD 21.14USD 4,131,327SEC filing ↗
2026-06-26Rhodes Jason PSale (S)Common Stock309,268USD 21.28USD 6,581,223SEC filing ↗
2026-06-25Rhodes Jason PSale (S)Common Stock24,100USD 21.10USD 508,510SEC filing ↗
2026-06-25Lucera ErickSale (S)Common Stock2,362USD 20.37USD 48,114SEC filing ↗
2026-06-24Rhodes Jason PSale (S)Common Stock95,900USD 21.02USD 2,015,818SEC filing ↗
2026-06-23Rhodes Jason PSale (S)Common Stock147,760USD 21.13USD 3,122,169SEC filing ↗
2026-06-23Kersten DirkSale (S)Common Stock73,286USD 21.05USD 1,542,650SEC filing ↗
2026-06-22Kersten DirkSale (S)Common Stock190,676USD 20.57USD 3,922,205SEC filing ↗
2026-06-18Kersten DirkSale (S)Common Stock46,901USD 20.07USD 941,303SEC filing ↗
2026-06-17Kersten DirkSale (S)Common Stock37,454USD 20.14USD 754,324SEC filing ↗
2026-06-16Kerr DouglasSale (S)Common Stock887USD 18.33USD 16,259SEC filing ↗
2026-06-16Friedl-Naderer JohannaSale (S)Common Stock145USD 18.33USD 2,658SEC filing ↗
2026-06-16Cox JohnSale (S)Common Stock2,683USD 18.33USD 49,179SEC filing ↗
2026-06-08Posner Brian SPurchase (P)Common Stock2,000USD 16.94USD 33,880SEC filing ↗
2026-06-03Posner Brian SPurchase (P)Common Stock2,500USD 17.48USD 43,700SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerDYN
CIK0001818794
SectorHealthcare
IndustryBiotechnology Yahoo Finance
SEC SIC2834 Pharmaceutical Preparations
ExchangeNasdaq

Data coverage

Local Form 4 history614 transaction lines from 2020-09-17 to 2026-10-02
18 P purchase lines · 461 S sale lines · 135 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.