Dyne Therapeutics (DYN) stock: insider trades, news & valuation
Health Care · Net selling
Close · Oct 9, 2026
$16.64
+1.6% on the day
+13.4% over 12 months
52-week range $14.03 – $26.78
Share price and insider trades
DYN closeInsider buyInsider sale
Bought, 12 months$315K
Sold, 12 months$169M
Insiders buying1
Insiders selling6
Dyne Therapeutics insider trading at a glance (Oct 9, 2026): in the past 12 months, 1 insider bought $315K and 6 sold $169M of DYN stock on the open market.
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DYN insider buying and selling by quarter
Open-market purchases (green, above the line) and sales (red, below), by trade date.
| Quarter | Bought | Purchases | Sold | Sales |
|---|---|---|---|---|
| Q4 2026 | $40K | 1 | — | 0 |
| Q3 2026 | — | 0 | $90.2M | 27 |
| Q2 2026 | $157K | 4 | $62.6M | 84 |
| Q1 2026 | $118K | 3 | $15.7M | 8 |
| Q4 2025 | — | 0 | $76K | 3 |
Valuation, profit and volume
Pick score 52/100P/E (trailing)n/aSector median 24.7
Market value$3.11BBiotechnology
Profit margin0.0%Revenue growth —
Volume vs. 50-day1.6×Last 5 sessions
Insiders' paper profit−$7KOn all tracked purchases -2.2%
Summary
Over the past 12 months, 1 Dyne Therapeutics, Inc. insider reported open-market purchases totaling $315K, while 6 insiders reported sales totaling $169M. Among insiders with enough purchase history to measure, Brian S Posner (Director) has the highest Insider Score at 86. 121 of 122 recorded sales were made under pre-scheduled Rule 10b5-1 trading plans, which are usually less informative than discretionary sales.
DYN stock news and SEC filings
Recent 8-K filings and headlines. Tone is scored from the headline wording; “Policy” marks regulatory, trade or government topics.
Insider transactions
Open-market purchases and sales.
| Filed | Insider | Type | Shares | Price | Value | Since | Score |
|---|---|---|---|---|---|---|---|
| Oct 6SEC | Brian S PosnerDirector | Buy | 2,50027,000 held (+10%) | $16.00 | $40K | +4.0% | 86 |
| Sep 8SEC | John CoxCEO, President | Sell Plan | 5,658357,507 held (−2%) | $18.88 | $107K | -11.9% | — |
| Sep 8SEC | Douglas KerrChief Medical Officer | Sell Plan | 3,745163,854 held (−2%) | $24.35 | $91K | -31.7% | — |
| Sep 8SEC | Douglas KerrChief Medical Officer | Sell Plan | 1,290162,564 held (−1%) | $18.88 | $24K | -11.9% | — |
| Sep 8SEC | Johanna Friedl-nadererChief Commercial Officer | Sell Plan | 900153,082 held (−1%) | $24.35 | $22K | -31.7% | — |
| Sep 8SEC | Johanna Friedl-nadererChief Commercial Officer | Sell Plan | 185152,897 held (−0%) | $18.88 | $3K | -11.9% | — |
| Aug 17SEC | Jason P RhodesDirector | Sell Plan | 1,359,6742,441,454 held (−36%) | $25.00 | $34.0M | -33.4% | — |
| Aug 17SEC | Jason P RhodesDirector | Sell Plan | 478,377567,358 held (−46%) | $25.00 | $12.0M | -33.4% | — |
| Aug 17SEC | Jason P RhodesDirector | Sell Plan | 322,465428,946 held (−43%) | $25.00 | $8.1M | -33.4% | — |
| Aug 17SEC | Jason P RhodesDirector | Sell Plan | 268,3543,801,128 held (−7%) | $26.20 | $7.0M | -36.5% | — |
| Aug 17SEC | Jason P RhodesDirector | Sell Plan | 94,4151,045,735 held (−8%) | $26.20 | $2.5M | -36.5% | — |
| Aug 17SEC | Jason P RhodesDirector | Sell Plan | 63,643751,411 held (−8%) | $26.20 | $1.7M | -36.5% | — |
| Aug 17SEC | John CoxCEO, President | Sell Plan | 4,986363,165 held (−1%) | $26.28 | $131K | -36.7% | — |
| Aug 17SEC | Erick LuceraCFO | Sell Plan | 1,797119,766 held (−1%) | $26.28 | $47K | -36.7% | — |
| Aug 17SEC | Douglas KerrChief Medical Officer | Sell Plan | 1,556167,599 held (−1%) | $26.28 | $41K | -36.7% | — |
| Aug 17SEC | Johanna Friedl-nadererChief Commercial Officer | Sell Plan | 226153,982 held (−0%) | $26.28 | $6K | -36.7% | — |
| Jul 29SEC | Dirk KerstenDirector | Sell Plan | 256,0723,592,184 held (−7%) | $25.50 | $6.5M | -34.7% | — |
| Jul 29SEC | Dirk KerstenDirector | Sell Plan | 5,3883,586,796 held (−0%) | $26.04 | $140K | -36.1% | — |
| Jul 8SEC | Jason P RhodesDirector | Sell Plan | 253,0394,223,448 held (−6%) | $22.79 | $5.8M | -27.0% | — |
| Jul 8SEC | Jason P RhodesDirector | Sell Plan | 127,1821,217,537 held (−9%) | $22.79 | $2.9M | -27.0% | — |
| Jul 8SEC | Jason P RhodesDirector | Sell Plan | 124,3794,099,069 held (−3%) | $23.17 | $2.9M | -28.2% | — |
| Jul 8SEC | Jason P RhodesDirector | Sell Plan | 100,019875,912 held (−10%) | $22.79 | $2.3M | -27.0% | — |
| Jul 8SEC | Jason P RhodesDirector | Sell Plan | 62,5431,154,994 held (−5%) | $23.17 | $1.4M | -28.2% | — |
| Jul 8SEC | Jason P RhodesDirector | Sell Plan | 49,193826,719 held (−6%) | $23.17 | $1.1M | -28.2% | — |
| Jul 8SEC | Jason P RhodesDirector | Sell Plan | 29,5874,069,482 held (−1%) | $23.62 | $699K | -29.6% | — |
| Jul 8SEC | Jason P RhodesDirector | Sell Plan | 14,8441,140,150 held (−1%) | $23.62 | $351K | -29.6% | — |
| Jul 8SEC | Jason P RhodesDirector | Sell Plan | 11,665815,054 held (−1%) | $23.62 | $276K | -29.6% | — |
| Jul 8SEC | Jason P RhodesDirector | Sell Plan | 5,0002,962 held (−63%) | $23.61 | $118K | -29.5% | — |
| Jun 30SEC | Jason P RhodesDirector | Sell Plan | 162,9544,579,456 held (−3%) | $21.28 | $3.5M | -21.8% | — |
| Jun 30SEC | Jason P RhodesDirector | Sell Plan | 102,9694,476,487 held (−2%) | $21.14 | $2.2M | -21.3% | — |
| Jun 30SEC | Jason P RhodesDirector | Sell Plan | 81,9031,396,475 held (−6%) | $21.28 | $1.7M | -21.8% | — |
| Jun 30SEC | Jason P RhodesDirector | Sell Plan | 64,4111,016,633 held (−6%) | $21.28 | $1.4M | -21.8% | — |
| Jun 30SEC | Jason P RhodesDirector | Sell Plan | 51,7561,344,719 held (−4%) | $21.14 | $1.1M | -21.3% | — |
| Jun 30SEC | Jason P RhodesDirector | Sell Plan | 40,702975,931 held (−4%) | $21.14 | $860K | -21.3% | — |
| Jun 26SEC | Jason P RhodesDirector | Sell Plan | 77,8554,805,639 held (−2%) | $21.13 | $1.6M | -21.2% | — |
| Jun 26SEC | Jason P RhodesDirector | Sell Plan | 50,5304,755,109 held (−1%) | $21.02 | $1.1M | -20.8% | — |
| Jun 26SEC | Jason P RhodesDirector | Sell Plan | 39,1311,510,157 held (−3%) | $21.13 | $827K | -21.2% | — |
| Jun 26SEC | Jason P RhodesDirector | Sell Plan | 30,7741,106,036 held (−3%) | $21.13 | $650K | -21.2% | — |
| Jun 26SEC | Jason P RhodesDirector | Sell Plan | 25,3971,484,760 held (−2%) | $21.02 | $534K | -20.8% | — |
| Jun 26SEC | Jason P RhodesDirector | Sell Plan | 19,9731,086,063 held (−2%) | $21.02 | $420K | -20.8% | — |
| Jun 26SEC | Jason P RhodesDirector | Sell Plan | 12,6994,742,410 held (−0%) | $21.10 | $268K | -21.1% | — |
| Jun 26SEC | Jason P RhodesDirector | Sell Plan | 6,3821,478,378 held (−0%) | $21.10 | $135K | -21.1% | — |
| Jun 26SEC | Jason P RhodesDirector | Sell Plan | 5,0191,081,044 held (−0%) | $21.10 | $106K | -21.1% | — |
| Jun 26SEC | Erick LuceraCFO | Sell | 2,362121,563 held (−2%) | $20.37 | $48K | -18.3% | — |
| Jun 24SEC | Dirk KerstenDirector | Sell Plan | 190,6763,921,542 held (−5%) | $20.57 | $3.9M | -19.1% | — |
| Jun 24SEC | Dirk KerstenDirector | Sell Plan | 71,6293,849,913 held (−2%) | $21.04 | $1.5M | -20.9% | — |
| Jun 24SEC | Dirk KerstenDirector | Sell Plan | 1,6573,848,256 held (−0%) | $21.47 | $36K | -22.5% | — |
| Jun 22SEC | Dirk KerstenDirector | Sell Plan | 46,9014,112,218 held (−1%) | $20.07 | $941K | -17.1% | — |
| Jun 22SEC | Dirk KerstenDirector | Sell Plan | 37,4544,159,119 held (−1%) | $20.14 | $754K | -17.4% | — |
| Jun 17SEC | John CoxCEO, President | Sell Plan | 2,683368,151 held (−1%) | $18.33 | $49K | -9.2% | — |
| Jun 17SEC | Douglas KerrChief Medical Officer | Sell Plan | 887169,155 held (−1%) | $18.33 | $16K | -9.2% | — |
| Jun 17SEC | Johanna Friedl-nadererChief Commercial Officer | Sell Plan | 145154,208 held (−0%) | $18.33 | $3K | -9.2% | — |
| Jun 9SEC | Brian S PosnerDirector | Buy | 2,00024,500 held (+9%) | $16.94 | $34K | -1.8% | 86 |
| Jun 5SEC | Brian S PosnerDirector | Buy | 2,50022,500 held (+12%) | $17.48 | $44K | -4.8% | 86 |
| May 28SEC | Brian S PosnerDirector | Buy | 2,00020,000 held (+11%) | $18.21 | $36K | -8.6% | 86 |
| May 22SEC | Brian S PosnerDirector | Buy | 2,50018,000 held (+16%) | $17.12 | $43K | -2.8% | 86 |
| May 14SEC | John CoxCEO, President | Sell Plan | 3,311370,834 held (−1%) | $18.36 | $61K | -9.4% | — |
| May 14SEC | Douglas KerrChief Medical Officer | Sell Plan | 1,564170,042 held (−1%) | $18.36 | $29K | -9.4% | — |
| May 14SEC | Erick LuceraCFO | Sell Plan | 1,448123,925 held (−1%) | $18.36 | $27K | -9.4% | — |
| May 14SEC | Johanna Friedl-nadererChief Commercial Officer | Sell Plan | 228154,353 held (−0%) | $18.36 | $4K | -9.4% | — |
| May 6SEC | Jason P RhodesDirector | Sell Plan | 43,6214,883,494 held (−1%) | $18.18 | $793K | -8.5% | — |
| May 6SEC | Jason P RhodesDirector | Sell Plan | 21,9261,549,288 held (−1%) | $18.18 | $399K | -8.5% | — |
| May 6SEC | Jason P RhodesDirector | Sell Plan | 17,2441,136,810 held (−1%) | $18.18 | $313K | -8.5% | — |
| May 6SEC | Jason P RhodesDirector | Sell Plan | 6,2414,933,196 held (−0%) | $18.00 | $112K | -7.6% | — |
| May 6SEC | Jason P RhodesDirector | Sell Plan | 6,0814,927,115 held (−0%) | $18.03 | $110K | -7.7% | — |
| May 6SEC | Jason P RhodesDirector | Sell Plan | 3,1361,574,270 held (−0%) | $18.00 | $56K | -7.6% | — |
| May 6SEC | Jason P RhodesDirector | Sell Plan | 3,0561,571,214 held (−0%) | $18.03 | $55K | -7.7% | — |
| May 6SEC | Jason P RhodesDirector | Sell Plan | 2,4661,156,457 held (−0%) | $18.00 | $44K | -7.6% | — |
| May 6SEC | Jason P RhodesDirector | Sell Plan | 2,4031,154,054 held (−0%) | $18.03 | $43K | -7.7% | — |
| May 6SEC | Jason P RhodesDirector | Sell Plan | 4287,962 held (−5%) | $18.18 | $8K | -8.5% | — |
| May 6SEC | Jason P RhodesDirector | Sell Plan | 618,450 held (−1%) | $18.00 | $1K | -7.6% | — |
| May 6SEC | Jason P RhodesDirector | Sell Plan | 608,390 held (−1%) | $18.03 | $1K | -7.7% | — |
| Apr 30SEC | Jason P RhodesDirector | Sell Plan | 119,1154,939,489 held (−2%) | $18.38 | $2.2M | -9.5% | — |
| Apr 30SEC | Jason P RhodesDirector | Sell Plan | 59,8701,577,432 held (−4%) | $18.38 | $1.1M | -9.5% | — |
| Apr 30SEC | Jason P RhodesDirector | Sell Plan | 47,0821,158,944 held (−4%) | $18.38 | $865K | -9.5% | — |
| Apr 30SEC | Jason P RhodesDirector | Sell Plan | 1,1708,512 held (−12%) | $18.38 | $22K | -9.5% | — |
| Apr 30SEC | Jason P RhodesDirector | Sell Plan | 524,939,437 held (−0%) | $19.00 | $988 | -12.4% | — |
| Apr 30SEC | Jason P RhodesDirector | Sell Plan | 261,577,406 held (−0%) | $19.00 | $494 | -12.4% | — |
| Apr 30SEC | Jason P RhodesDirector | Sell Plan | 211,158,923 held (−0%) | $19.00 | $399 | -12.4% | — |
| Apr 30SEC | Jason P RhodesDirector | Sell Plan | 18,511 held (−0%) | $19.00 | $19 | -12.4% | — |
| Apr 27SEC | Jason P RhodesDirector | Sell Plan | 90,9435,058,604 held (−2%) | $18.15 | $1.7M | -8.3% | — |
| Apr 27SEC | Jason P RhodesDirector | Sell Plan | 72,3105,149,547 held (−1%) | $18.48 | $1.3M | -10.0% | — |
| Apr 27SEC | Jason P RhodesDirector | Sell Plan | 45,7091,637,302 held (−3%) | $18.15 | $830K | -8.3% | — |
| Apr 27SEC | Jason P RhodesDirector | Sell Plan | 38,3225,221,857 held (−1%) | $19.19 | $735K | -13.3% | — |
| Apr 27SEC | Jason P RhodesDirector | Sell Plan | 36,3451,683,011 held (−2%) | $18.48 | $672K | -10.0% | — |
| Apr 27SEC | Jason P RhodesDirector | Sell Plan | 35,9471,206,026 held (−3%) | $18.15 | $652K | -8.3% | — |
| Apr 27SEC | Jason P RhodesDirector | Sell Plan | 28,5831,241,973 held (−2%) | $18.48 | $528K | -10.0% | — |
| Apr 27SEC | Jason P RhodesDirector | Sell Plan | 19,2611,719,356 held (−1%) | $19.19 | $370K | -13.3% | — |
| Apr 27SEC | Jason P RhodesDirector | Sell Plan | 15,1481,270,556 held (−1%) | $19.19 | $291K | -13.3% | — |
| Apr 27SEC | Jason P RhodesDirector | Sell Plan | 8949,682 held (−8%) | $18.15 | $16K | -8.3% | — |
| Apr 27SEC | Jason P RhodesDirector | Sell Plan | 71010,576 held (−6%) | $18.48 | $13K | -10.0% | — |
| Apr 27SEC | Jason P RhodesDirector | Sell Plan | 37711,286 held (−3%) | $19.19 | $7K | -13.3% | — |
| Apr 23SEC | Dirk KerstenDirector | Sell Plan | 8,3004,199,225 held (−0%) | $20.01 | $166K | -16.8% | — |
| Apr 23SEC | Dirk KerstenDirector | Sell Plan | 2,6524,196,573 held (−0%) | $20.00 | $53K | -16.8% | — |
| Apr 22SEC | Jason P RhodesDirector | Sell Plan | 150,9425,260,179 held (−3%) | $19.68 | $3.0M | -15.4% | — |
| Apr 22SEC | Jason P RhodesDirector | Sell Plan | 142,6045,554,904 held (−3%) | $20.06 | $2.9M | -17.0% | — |
| Apr 22SEC | Jason P RhodesDirector | Sell Plan | 142,2535,412,651 held (−3%) | $19.51 | $2.8M | -14.7% | — |
| Apr 22SEC | Jason P RhodesDirector | Sell Plan | 75,8661,738,617 held (−4%) | $19.68 | $1.5M | -15.4% | — |
| Apr 22SEC | Jason P RhodesDirector | Sell Plan | 71,6761,886,751 held (−4%) | $20.06 | $1.4M | -17.0% | — |
| Apr 22SEC | Jason P RhodesDirector | Sell Plan | 71,4991,815,252 held (−4%) | $19.51 | $1.4M | -14.7% | — |
| Apr 22SEC | Jason P RhodesDirector | Sell Plan | 59,6631,285,704 held (−4%) | $19.68 | $1.2M | -15.4% | — |
| Apr 22SEC | Jason P RhodesDirector | Sell Plan | 56,3681,402,200 held (−4%) | $20.06 | $1.1M | -17.0% | — |
| Apr 22SEC | Jason P RhodesDirector | Sell Plan | 56,2281,345,972 held (−4%) | $19.51 | $1.1M | -14.7% | — |
| Apr 22SEC | Jason P RhodesDirector | Sell Plan | 1,5305,411,121 held (−0%) | $20.05 | $31K | -17.0% | — |
| Apr 22SEC | Jason P RhodesDirector | Sell Plan | 1,48511,663 held (−11%) | $19.68 | $29K | -15.4% | — |
| Apr 22SEC | Jason P RhodesDirector | Sell Plan | 1,40114,561 held (−9%) | $20.06 | $28K | -17.0% | — |
| Apr 22SEC | Jason P RhodesDirector | Sell Plan | 1,39813,163 held (−10%) | $19.51 | $27K | -14.7% | — |
| Apr 22SEC | Jason P RhodesDirector | Sell Plan | 7691,814,483 held (−0%) | $20.05 | $15K | -17.0% | — |
| Apr 22SEC | Jason P RhodesDirector | Sell Plan | 6051,345,367 held (−0%) | $20.05 | $12K | -17.0% | — |
| Apr 22SEC | Jason P RhodesDirector | Sell Plan | 1513,148 held (−0%) | $20.05 | $301 | -17.0% | — |
| Apr 21SEC | Dirk KerstenDirector | Sell Plan | 211,9744,332,799 held (−5%) | $20.29 | $4.3M | -18.0% | — |
| Apr 21SEC | Dirk KerstenDirector | Sell Plan | 125,2744,207,525 held (−3%) | $20.07 | $2.5M | -17.1% | — |
| Apr 17SEC | Dirk KerstenDirector | Sell Plan | 81,8404,562,546 held (−2%) | $20.27 | $1.7M | -17.9% | — |
| Apr 17SEC | Dirk KerstenDirector | Sell Plan | 11,1164,551,430 held (−0%) | $21.10 | $235K | -21.1% | — |
| Apr 17SEC | Dirk KerstenDirector | Sell Plan | 6,6574,544,773 held (−0%) | $20.06 | $134K | -17.0% | — |
| Apr 3SEC | Erick LuceraCFO | Sell Plan | 5,727125,373 held (−4%) | $18.64 | $107K | -10.7% | — |
| Apr 1SEC | Brian S PosnerDirector | Buy | 2,00015,500 held (+15%) | $17.08 | $34K | -2.6% | 86 |
| Mar 13SEC | Dirk KerstenDirector | Sell Plan | 129,6724,644,386 held (−3%) | $19.52 | $2.5M | -14.8% | — |
| Mar 13SEC | Brian S PosnerDirector | Buy | 2,00013,500 held (+17%) | $19.35 | $39K | -14.0% | 86 |
| Mar 11SEC | Dirk KerstenDirector | Sell Plan | 281,8584,774,058 held (−6%) | $19.80 | $5.6M | -16.0% | — |
| Mar 11SEC | Dirk KerstenDirector | Sell Plan | 219,7585,055,916 held (−4%) | $19.33 | $4.2M | -13.9% | — |
| Mar 11SEC | Dirk KerstenDirector | Sell Plan | 177,6905,285,156 held (−3%) | $17.72 | $3.1M | -6.1% | — |
| Mar 11SEC | Dirk KerstenDirector | Sell Plan | 9,4825,275,674 held (−0%) | $18.21 | $173K | -8.6% | — |
| Mar 10SEC | Brian S PosnerDirector | Buy | 3,00011,500 held (+35%) | $15.06 | $45K | +10.5% | 86 |
| Mar 6SEC | John CoxCEO, President | Sell Plan | 2,732374,145 held (−1%) | $14.90 | $41K | +11.7% | — |
| Mar 6SEC | Douglas KerrChief Medical Officer | Sell Plan | 904171,606 held (−1%) | $14.90 | $13K | +11.7% | — |
| Mar 6SEC | Johanna Friedl-nadererChief Commercial Officer | Sell Plan | 148154,581 held (−0%) | $14.90 | $2K | +11.7% | — |
| Dec 5SEC | John CoxCEO, President | Sell Plan | 2,662196,877 held (−1%) | $20.72 | $55K | -19.7% | — |
| Dec 5SEC | Douglas KerrChief Medical Officer | Sell Plan | 88087,510 held (−1%) | $20.72 | $18K | -19.7% | — |
| Dec 5SEC | Johanna Friedl-nadererChief Commercial Officer | Sell Plan | 14494,729 held (−0%) | $20.72 | $3K | -19.7% | — |
Insiders at Dyne Therapeutics, Inc.
| Insider | Bought | Sold | Last filing | Score |
|---|---|---|---|---|
| Jason P RhodesDirector | — | $129M | Aug 17, 2026 | — |
| Dirk KerstenDirector | — | $38.6M | Jul 29, 2026 | — |
| Brian S PosnerDirector | $315K | — | Oct 6, 2026 | 86 |
| John CoxCEO, President | — | $444K | Sep 8, 2026 | — |
| Douglas KerrChief Medical Officer | — | $233K | Sep 8, 2026 | — |
| Erick LuceraCFO | — | $229K | Aug 17, 2026 | — |
| Johanna Friedl-nadererChief Commercial Officer | — | $43K | Sep 8, 2026 | — |
Insider activity at other Health Care companies
Same sector, ranked by insider buying in the last 90 days.
DYN stock: common questions
Are Dyne Therapeutics, Inc. insiders buying DYN stock?
In the past 12 months, 1 insiders reported open-market purchases of DYN worth $315K. The latest was Director Brian S Posner bought $40K of DYN at $16.00.
Are Dyne Therapeutics, Inc. insiders selling DYN stock?
6 insiders reported sales worth $169M over the same period.
Where does this data come from?
Every transaction comes from Form 4 filings that insiders must submit to the SEC within two business days of a trade. We pull them from SEC EDGAR every night.
What is DYN's 52-week range?
Over the past year DYN has traded between $14.03 and $26.78. It last closed at $16.64 on Oct 9, 2026.