Previous Officer Files Intent to Sell $740K in Stock
PRTA sits 76% above its 52-week low of $4.95.
Summary
A previous officer of Prothena has filed a Form 144 to sell 80,000 shares worth $740,000, signaling a significant disposition by a former executive.
Key Events · Ownership and Investor Activity · PRTA
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Intent to Sell Shares
Michael J. Malecek, a previous officer, filed a Form 144 to sell 80,000 shares of common stock.
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Significant Value
The proposed sale has an approximate market value of $740,000.
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Source of Shares
The shares were acquired on July 28, 2025, through an employee restricted share unit award.
Analysis · PRTA · Life Sciences
A former officer, Michael J. Malecek, has filed a Form 144 indicating intent to sell 80,000 shares of common stock, valued at approximately $740,000. This sale represents a notable disposition by a former executive, potentially adding to market supply. The shares were acquired through an employee restricted share unit award.
How filings like this one have moved
In the 30 days to Oct 5, 2026, 29.2% of the 1496 measured filings Wiseek scored 7 moved their stock by 5% or more by the next session's close. The median move was -0.63%. These are measured outcomes after filings of this importance, not a forecast for this one.
Measured one observation per ticker per day, after exclusions. Current figures: Filing Impact Tracker · open dataset
At the time of this filing, PRTA was trading at $8.71 on NASDAQ in the Life Sciences sector, with a market capitalization of approximately $448.1M. The 52-week trading range was $4.95 to $11.80. This filing was assessed with negative market sentiment and an importance score of 7 out of 10.