Why QSI rose 20.1% on Oct 9 2026: proteus milestone
QSI+20.1%on Fri Oct 9 2026
Quantum-Si Incorporated Class A Common Stock was up 20.1% on the day at $1.47, ranked #9 on 40.3× its usual five-minute volume, when TapeRank recorded this spike at 10:03 ET during regular hours.
THE DAY ON THE LIST · 1 EVENT
- 10:03 ETMOVER · REGULAR
$1.47 · ▲ 20.1% ON THE DAY · 40.3× 5M RVOL · RANK #9
STRETCHEDCONFIDENCE5/5QSI is up 16.0%, with a sharp 3.98% rise in the last five minutes, after announcing detection of 19 amino acids in its Proteus development program. The milestone is meaningful technical progress, but it remains development-stage and unquantified, so the move is larger than the disclosed news supports.
WHYUp 16.0% on a development milestone involving 19 amino acids and no disclosed financial impact is a move larger than the catalyst warrants.ANALYZED 09:56 ET · 6 MIN AGO · OPENAI/GPT-5.6-LUNATHE ROW AND SESSION LEVELS AT 10:03 ET
LAST1.47DAY▲ 20.1%5 MIN▲ 3.18%5M RVOL40.3×5M $VOL$1.2MFLOAT*198.9MRANK#9SESSIONREGULARVWAP1.38HOD1.46LOD1.21OR HIGH1.35OR LOW1.26PREV CLOSE1.22PM HIGH1.27PM LOW1.21GAP▲ 3.28%* FLOAT IS SHARES OUTSTANDING; TRUE FREE FLOAT IS NOT AVAILABLE
THE SESSION
- 09:30 ETOpened at $1.26, +3.3% on the previous close of $1.22
- 09:30 ETRegular-session low, $1.26
- 13:42 ETRegular-session high, $1.66
- 15:59 ETLast trade of the regular session, $1.52, +24.6% on the previous close of $1.22
- Volume: 40.1M shares in regular hours, 152K before the open
QSI opened at $1.26 after the company announced detection of 19 amino acids in its Proteus development program and said it was working to deploy the capability in a sequencing kit. TapeRank tied the move to that technical milestone, while reading the advance as stretched because the news was development-stage and disclosed no financial impact; it recorded the stock at $1.47, up 20.1%, at 10:03 ET. With no halts, QSI climbed to $1.66 at 13:42 ET before easing to $1.52 at the close, still up 24.6% from the previous close.
WRITTEN THU OCT 15 2026 18:03 ET BY OPENAI/GPT-5.6-LUNA FROM THE FACTS ON THIS PAGE
FILINGS AND NEWS · 24H BEFORE THE MOVE
- THU 16:12 ET8-K — Regulation FD Disclosure; Financial Statements and ExhibitsSEC 8-K
- THU 16:08 ETQuantum-Si Demonstrates Detection of 19 Amino Acids in Proteus Development Program; Co Is Now Working To Deploy That Capability Into A Developmental Sequencing Kit For Routine Use On Integrated Proteus InstrumentsBenzinga
On the tape right now
WHERE THE LIST STOODWED NOV 4 2026 · 13:49 ETRECORDED LIVE · 742 QUALIFY
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