Insider Trading June 24, 2026 08:50 PM

Disc Medicine COO Jonathan Yu Executes Stock Sale Under Pre-Arranged Trading Plan

Executive transaction coincides with clinical updates and FDA discussions for the biotech firm, raising questions about insider positioning amid recent stock volatility.

By Hana Yamamoto
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IRON

Disc Medicine, Inc. (NASDAQ: IRON) Chief Operating Officer Jonathan Yen-Wen Yu executed a significant transaction involving the sale of 9,700 shares of the company's common stock on June 22, 2026. The sale, valued at $704,795, occurred at prices between $72.50 and $72.68 per share, which is slightly above the stock's closing price of $70.37. This activity was conducted under a Rule 10b5-1 trading plan established on March 17, 2026. The transaction followed the acquisition of an equivalent number of shares through the exercise of stock options at a lower price of $13.50 per share, totaling $130,950. These options were part of a long-term vesting schedule tied to his continued employment. Post-transaction, Mr. Yu holds 54,324 shares directly and 24,147 derivative shares from stock options expiring in 2032. The sale comes as Disc Medicine presents updated clinical data for its DISC-0974 treatment and engages with the FDA regarding bitopertin for erythropoietic protoporphyria.

Disc Medicine COO Jonathan Yu Executes Stock Sale Under Pre-Arranged Trading Plan
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Key Points

  • Executive Insider Activity: COO Jonathan Yu sold $704,795 worth of stock under a pre-arranged 10b5-1 plan, following the exercise of options at $13.50 per share. This activity highlights the mechanics of executive compensation and liquidity events within the biotech sector.
  • Clinical and Regulatory Milestones: Disc Medicine presented promising RALLY-MF trial data and engaged with the FDA regarding bitopertin. These developments are critical for the healthcare and biopharmaceutical sectors, influencing investor sentiment around drug approval pipelines.
  • Market Volatility and Valuation: The stock trades above its fair value estimate and exhibits a high beta of 2.1. This volatility impacts risk assessment for institutional and retail investors in the small-cap biotech space, requiring careful monitoring of clinical catalysts.

Jonathan Yen-Wen Yu, serving as the Chief Operating Officer for Disc Medicine, Inc. (NASDAQ: IRON), finalized a transaction involving the sale of 9,700 shares of the company's common equity on June 22, 2026. The total value of this disposition reached $704,795. The shares were executed at a price range of $72.50 to $72.68 per share. This execution price sits slightly above the stock's reported value of $70.37 at the time of the transaction. The sale was carried out in accordance with a Rule 10b5-1 trading plan that was originally adopted on March 17, 2026.

The timing of this sale warrants attention as Disc Medicine shares have demonstrated significant movement over the past year, delivering a return of 30.52%. Current trading data suggests the stock is positioned above its InvestingPro Fair Value estimate, a metric that may imply the valuation is elevated relative to intrinsic metrics. Market data provided by InvestingPro Tips indicates the stock exhibits considerable volatility, characterized by a beta of 2.1.

Before the shares were sold, Mr. Yu acquired 9,700 shares of common stock on the same day, June 22, 2026. This acquisition was facilitated through the exercise of stock options at a strike price of $13.50 per share, resulting in a total cost of $130,950. These options were granted as part of an award designed to vest in 48 equal monthly installments following December 29, 2022, contingent upon his continued service with the company. This acquisition was also integrated into the same Rule 10b5-1 trading plan.

Following the completion of these transactions, Mr. Yu's direct holding in Disc Medicine, Inc. common stock stands at 54,324 shares. Additionally, he maintains a position in 24,147 derivative shares in the form of stock options. These options carry an exercise price of $13.50 and are set to expire on December 28, 2032.

In parallel with executive activity, Disc Medicine has been active in clinical and regulatory arenas. The company recently presented updated clinical trial data for two investigational treatments at the European Hematology Association Annual Meeting in Stockholm. The RALLY-MF trial focused on DISC-0974, which enrolled 61 adult patients suffering from myelofibrosis and anemia. The responder analysis included data from 50 patients, showing promising results.

Furthermore, Disc Medicine completed a Type A meeting with the U.S. Food and Drug Administration regarding bitopertin. This meeting addressed the Complete Response Letter for erythropoietic protoporphyria. The FDA indicated that if the ongoing Phase 3 APOLLO study achieves success, it could support a traditional approval pathway. A response regarding this matter is expected by the end of 2026.

Stifel reiterated a Buy rating on Disc Medicine following the presentation of Phase 2 RALLY-MF trial data. The firm highlighted the drug's efficacy regardless of baseline anemia severity. Disc Medicine also launched an expanded access program for bitopertin in the United States for eligible patients with erythropoietic protoporphyria and X-linked protoporphyria. This program provides access to bitopertin prior to regulatory approval for patients who lack satisfactory therapeutic alternatives.

Additionally, Disc Medicine announced plans to present data from its RALLY-MF Phase 2 trial at the American Society of Clinical Oncology Annual Meeting. This presentation will focus on anemia response rates in the myelofibrosis population. The stock closed at $70.37, down $0.11 or 0.16% during regular trading hours. After-hours trading showed a value of $70.37 at 17:44:22.

Risks

  • Clinical Trial Uncertainty: The success of the ongoing Phase 3 APOLLO study is contingent on achieving specific endpoints to support traditional approval for bitopertin. Failure could significantly impact the company's valuation and the broader biopharmaceutical market's confidence in its pipeline.
  • Regulatory Timeline Risks: The FDA response regarding bitopertin is not expected until the end of 2026. This extended timeline introduces uncertainty for investors and could affect cash flow projections and strategic planning within the healthcare sector.
  • Stock Volatility and Valuation Discrepancy: The stock's high beta of 2.1 and current trading above fair value estimates suggest elevated risk. Investors in the biotech sector must weigh these valuation metrics against the binary nature of clinical trial outcomes.

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