Ticker | Value | Shares | Price | Security | Type | Insider | Title | Return | Flags | Date |
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| No transactions found | ||||||||||
Stephen W. Webster currently holds 13,587 shares of Spark Therapeutics, Inc. (ONCE), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Stephen W. Webster has been a net seller of ONCE stock. They have purchased $154.7K and sold $4.7M worth of shares.
Stephen W. Webster's most recent insider trade was on Jun 8, 2026, when they sold 13,587 shares at $0.00 per share.
Stephen W. Webster serves as Executive at Spark Therapeutics, Inc. (ONCE). They have executed 48 insider transactions totaling $4.8M over their tenure at the company.
Stephen W. Webster holds the position of Executive at Spark Therapeutics, Inc., where they are responsible for executive-level decision-making and strategic oversight. They have been associated with the company for 17 years and currently hold a stake valued at $0.
Stephen W. Webster has shown a selling trading pattern, with $154.7K in total purchases and $4.7M in total sales across all transactions. Their most recent activity indicates a tendency to reduce their position.
The largest transaction by Stephen W. Webster was on Dec 12, 2011, when they sold $1.2M worth of ADLR shares. This transaction involved 281,250 shares at $4.25 per share.
Stephen W. Webster currently owns 13,587 shares of Spark Therapeutics, Inc. (ONCE), with an estimated value of $0. This stake represents their equity holdings accumulated through purchases, awards, and option exercises.
All of Stephen W. Webster's SEC Form 4 insider trading filings are tracked on this page. Each transaction links directly to the official SEC EDGAR filing. Stephen W. Webster has 48 Form 4 filings on record as an insider at Spark Therapeutics, Inc..
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