— Why it moved
Why PFSA Stock Spiked and Faded Today — September 24, 2026
Profusa jumped on premarket European regulatory news, offering a short window before giving back every cent.
What moved PFSA stock
Profusa, Inc. develops tissue-integrated biosensors for continuous health monitoring. The company put out a premarket PR showing progress on ISO 13485 quality system certification, a step toward European CE mark approval. Traders treated routine regulatory paperwork like a major revenue event.
The mechanics
With a float of just 518,167 shares and a market cap around 1.2 million dollars, a 50.03% morning gap easily sent order flow spiraling. Over 79 million shares churned as momentum traders cycled the paper repeatedly.
PFSA by the numbers
The alert window
The alert fired at 7:45 AM ET at $3.88. Readers had to sit through an immediate 9.1% drawdown down to $3.53 before shares pushed to the peak of $4.55 at 8:07 AM ET. That 17.2% gain gave a 22-minute exit window. Total time above the alert price lasted just 45 minutes.
How PFSA's move ended
It ended ugly. Shares steadily dumped, closing down 22.2% from the alert at $3.02. That is standard behavior for a micro-cap float rotation with a history of severe long-term share erosion.
The tell: Micro-cap regulatory progress news rarely holds gains past premarket trading.