Quantum-Si Incorporated (QSI) Stock Falls on Q4 2025 Earnings

Quantum-Si Incorporated (QSI) reported fourth-quarter 2025 results.

Total revenue of $451,000 (down 62.2% year‑over‑year; consensus estimate $769,620).

Gross profit of $122,000 (down 80.0% year‑over‑year) with cost of sales of $329,000 (down 43.5% year‑over‑year).

Operating loss of -$21.1 million (31.2% year‑over‑year).

Net loss attributable to common shareholders of -$17.6 million; diluted loss per share of -$0.08.

Balance-sheet and cash-flow context:

Cash used in operating activities of -$32.0 million, an improvement of about 39.9% year‑over‑year.

Cash and cash equivalents of $21.6 million (down 56.1% year‑over‑year).

Purchases of property, plant and equipment of -$900,000 (down 37.3% year‑over‑year).

Total liabilities of $25.4 million (down 21.8% year‑over‑year).

Estimates and market reaction:

Diluted EPS beat the estimate (reported -$0.08 vs. estimate of -$0.12); revenue missed consensus.

Shares responded with a price change of -5.02% since market close.

Note: This financials data is sourced from a third-party provider and has not been independently verified by Quiver.

Quantum-Si Incorporated Insider Trading Activity

Quantum-Si Incorporated insiders have traded $QSI stock on the open market 15 times in the past 6 months. Of those trades, 0 have been purchases and 15 have been sales.

Here’s a breakdown of recent trading of $QSI stock by insiders over the last 6 months:

JONATHAN M ROTHBERG sold 26,095 shares for an estimated $80,111
JEFFREY ALAN HAWKINS (President & CEO) has made 0 purchases and 3 sales selling 44,993 shares for an estimated $65,559.
TODD C. BENNETT (Chief Commercial Officer) has made 0 purchases and 2 sales selling 36,964 shares for an estimated $61,315.
JOHN S. VIECELI (Chief Product Officer) has made 0 purchases and 3 sales selling 41,613 shares for an estimated $60,633.
CHRISTIAN LAPOINTE (GC & Corp. Secretary) has made 0 purchases and 3 sales selling 22,679 shares for an estimated $33,045.
JEFFRY R. KEYES (Chief Financial Officer) has made 0 purchases and 3 sales selling 16,373 shares for an estimated $23,857.

To track insider transactions, check out Quiver Quantitative's insider trading dashboard.

Quantum-Si Incorporated Hedge Fund Activity

We have seen 67 institutional investors add shares of Quantum-Si Incorporated stock to their portfolio, and 75 decrease their positions in their most recent quarter.

Here are some of the largest recent moves:

MILLENNIUM MANAGEMENT LLC removed 2,478,168 shares (-92.8%) from their portfolio in Q4 2025, for an estimated $2,725,984
CITADEL ADVISORS LLC added 2,269,050 shares (+557.4%) to their portfolio in Q4 2025, for an estimated $2,495,955
BLACKROCK, INC. added 1,732,384 shares (+15.3%) to their portfolio in Q4 2025, for an estimated $1,905,622
UBS GROUP AG added 944,653 shares (+187.1%) to their portfolio in Q4 2025, for an estimated $1,039,118
VANGUARD GROUP INC added 892,515 shares (+10.2%) to their portfolio in Q4 2025, for an estimated $981,766
TWO SIGMA INVESTMENTS, LP added 868,329 shares (+168.3%) to their portfolio in Q4 2025, for an estimated $955,161
STATE STREET CORP added 745,231 shares (+26.5%) to their portfolio in Q4 2025, for an estimated $819,754

To track hedge funds' stock portfolios, check out Quiver Quantitative's institutional holdings dashboard.