Insider Trading June 17, 2026 04:09 PM

Dyne Therapeutics CEO John Cox Sells $49,179 in Stock

Insider Transaction Details and Company Developments

By Marcus Reed
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John Cox, the CEO and President of Dyne Therapeutics, Inc. (NASDAQ:DYN), recently sold 2,683 shares of the company's common stock on June 16, 2026, for a total value of $49,179. The sale was executed to satisfy tax withholding obligations related to the vesting of restricted stock units granted to Mr. Cox on December 4, 2024. This transaction was an automatic sale as provided for in a restricted stock unit agreement, consistent with a Rule 10b5-1 trading plan, and does not represent a discretionary trade by Mr. Cox. Following this transaction, Mr. Cox directly holds 368,151 shares of Dyne Therapeutics common stock, which includes 259,564 unvested restricted stock units. Additionally, he indirectly holds 72,000 shares across four separate trusts established for the benefit of his children. Dyne Therapeutics has also expanded its loan facility with Hercules Capital, increasing the total potential funding to $400 million. The company secured an additional $50 million immediately and has access to further tranches totaling $125 million, contingent upon meeting specific milestones. A final tranche of up to $75 million may also be available, subject to lender approval. In clinical developments, Dyne has completed enrollment in the expansion cohort of its Phase 1/2 ACHIEVE trial for myotonic dystrophy type 1, with plans to report topline data in early 2027. Additionally, Dyne has submitted a Biologics License Application to the FDA for its Duchenne muscular dystrophy treatment, zeleciment rostudirsen, seeking accelerated approval. The company has also launched its Phase 3 FORZETTO trial for the same treatment, aiming to enroll 90 participants.

Dyne Therapeutics CEO John Cox Sells $49,179 in Stock
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Key Points

  • John Cox, CEO and President of Dyne Therapeutics, sold 2,683 shares for $49,179 to satisfy tax withholding obligations related to the vesting of restricted stock units granted on December 4, 2024.
  • Dyne Therapeutics has expanded its loan facility with Hercules Capital, increasing the total potential funding to $400 million, with an additional $50 million secured immediately and further tranches contingent upon meeting specific milestones.
  • Dyne has completed enrollment in the expansion cohort of its Phase 1/2 ACHIEVE trial for myotonic dystrophy type 1, plans to report topline data in early 2027, and has submitted a Biologics License Application to the FDA for its Duchenne muscular dystrophy treatment, zeleciment rostudirsen.

Dyne Therapeutics, Inc. (NASDAQ:DYN) CEO and President John Cox executed a sale of 2,683 shares of the company's common stock on June 16, 2026. The transaction, valued at $49,179, involved shares sold at a weighted average price of $18.33, with individual transaction prices ranging from $18.00 to $18.70. This sale was part of a structured plan to meet tax withholding obligations tied to the vesting of restricted stock units originally granted to Mr. Cox on December 4, 2024. The transaction was automatic and consistent with a Rule 10b5-1 trading plan, indicating it was not a discretionary trade by Mr. Cox.

Post-transaction, Mr. Cox's direct holdings in Dyne Therapeutics stand at 368,151 shares, including 259,564 unvested restricted stock units. He also maintains indirect ownership of 72,000 shares distributed across four trusts established for his children's benefit.

Dyne Therapeutics has recently expanded its loan facility with Hercules Capital, increasing the total potential funding to $400 million. The company secured an additional $50 million immediately and has access to further tranches totaling $125 million, contingent upon meeting specific milestones. A final tranche of up to $75 million may also be available, subject to lender approval.

In clinical developments, Dyne has completed enrollment in the expansion cohort of its Phase 1/2 ACHIEVE trial for myotonic dystrophy type 1, with plans to report topline data in early 2027. Additionally, Dyne has submitted a Biologics License Application to the FDA for its Duchenne muscular dystrophy treatment, zeleciment rostudirsen, seeking accelerated approval. The company has also launched its Phase 3 FORZETTO trial for the same treatment, aiming to enroll 90 participants.

These developments reflect Dyne's ongoing efforts in advancing its therapeutic programs and securing financial resources. The company maintains a strong balance sheet with more cash than debt and carries a FAIR financial health rating according to InvestingPro analysis.

Risks

  • The availability of further tranches from the Hercules Capital loan facility is contingent upon Dyne meeting specific milestones, introducing execution risk related to clinical and operational targets.
  • The Phase 3 FORZETTO trial aims to enroll 90 participants, and delays or challenges in enrollment could impact the timeline for data availability and potential regulatory approval.
  • The submission of the Biologics License Application to the FDA for zeleciment rostudirsen is subject to regulatory review, and the outcome remains uncertain until approval is granted.

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