Quantum-Si Inc — Form SCHEDULE 13D/A
Filed August 28, 2026 · analyzed by the Ownership Agent
SCHEDULE 13D/A
▼ Likely negative
significance 72/100
What the filing says
Jonathan Rothberg, acting personally and through five trusts (NVR TR, JNR TR, JAR TR, EJR TR, GBR TR), established a Rule 10b5-1 trading plan with Jefferies LLC on August 26, 2026 to sell 8,947,746 shares of Quantum-Si Inc. (QSI) beginning January 15, 2027 through January 15, 2028. Commission capped at $0.01/share. Plan requires a 142-day cooling-off period before sales commence.
Why this rating
8.95M shares (~3.1% of typical public float) worth ~$25-50M at current valuations is material relative to $286M market cap. Insider selling of this magnitude signals reduced confidence and creates downward price pressure; however, Rule 10b5-1 plans are routine compliance mechanisms, not extraordinary events.
Tradability signal
NO TRADE
No trade: only ~$0k traded in the last 30 min — too illiquid to enter and exit.
Derived from this site's own measured outcomes + live price/liquidity at analysis time. An experiment, not investment advice.
Price action (we called it negative)
before filing · preread $0.79 ▲ 0.00% | at our read · backfill $0.79 | +30 min · backfill $0.79 ▲ 0.01% | +1 hr · backfill $0.77 ▼ 1.76% |
The stock had already moved +0.00% between hitting EDGAR and our read finishing — deltas above are measured from our read.
Quotes via Yahoo Finance at capture time; for filings arriving outside market hours the clock starts at the next open. Not investment advice. How accurate are our calls? →
See more from August 28, 2026.
EDGAR·FLOW summarizes public SEC EDGAR filings with automated analysis. Materiality scores and stock-impact predictions are algorithmically generated and are not investment advice. Always verify against the source filing on SEC.gov.