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QSI stock news · Quantum-Si Inc

Stories about Quantum-Si Inc (QSI) from the last 90 days, each explained in plain English with whether the news reads good or bad for the company.

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  1. Oct 15, 2026, 9:19 AM ET · Market

    Quantum-Si Inc: Other Events (QSI)

    Good for QSI

    Quantum-Si regained Nasdaq's $1 minimum closing-price rule, ending its current listing warning. It must keep meeting the rule to avoid another warning.

  2. Oct 9, 2026, 3:34 PM ET · Market

    Quantum-Si Stock Booms: What's Going On?

    Good for QSI

    Quantum-Si said its Proteus sequencer can identify 19 of 20 amino acids. This moves its planned product forward, though the kit and final amino acid remain unfinished.

  3. Oct 9, 2026, 1:13 PM ET · Market

    Here are 12 health care stocks that changed a lot during Friday's trading.

    Neutral

    Quantum-Si shares rose 30% in Friday trading, but the report gives no company news behind the move. It does not change the picture of the company's business.

  4. Oct 1, 2026, 1:15 PM ET · Market

    On Thursday, 12 health care stocks saw big price changes, with Nexalin Technology jumping up 77.8%.

    Neutral

    Quantum-Si shares rose 28.97% during Thursday's session, but the article gives no company news explaining the move, so its business outlook is unchanged.

  5. Oct 1, 2026, 8:15 AM ET · Market

    12 health care stocks are changing a lot before the market opens on Thursday.

    Neutral

    Quantum-Si shares rose 12.14%. The article reports a share move, not business news that changes the company's outlook.

  6. Sep 29, 2026, 2:30 PM ET · Market

    What's making Quantum-Si's stock go up on Tuesday?

    Good for QSI

    Quantum-Si reported interim tests where Proteus found more peptides and proteins than its Platinum Pro platform. The results support its product prospects, though one larger comparison is only projected.

  7. Sep 29, 2026, 1:21 PM ET · Market

    On Tuesday, 12 health care stocks saw big price changes during the day.

    Neutral

    Quantum-Si's shares rose 22.66% to $0.98, but the story gives no business reason. It reports no new company fact, so the outlook is unchanged.

  8. Aug 13, 2026, 5:58 PM ET · Results

    Complete Record: Quantum-Si's Earnings Call for Q2 2026

    Neutral

    Quantum-Si's Q2 2026 earnings call disclosed a delay in the launch of its Proteus product to Q2 2027, alongside a significant workforce reduction aimed at cost-saving. The decrease in revenue and the strategic shift towards application-oriented products may lead to negative investor sentiment and impact the stock's performance in the near term.