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QSI
Quantum-Si Incorporated Class A Common Stock
stock NASDAQ

At Close
Sep 29, 2026 3:59:48 PM EDT
0.9600USD+20.792%(+0.1650)22,869,241
0.9100Bid   1.00Ask   0.0900Spread
Pre-market
Sep 29, 2026 9:17:30 AM EDT
0.8154USD+2.566%(+0.0204)4,184
After-hours
Sep 29, 2026 4:59:30 PM EDT
0.9556USD-0.489%(-0.0047)64,631
OverviewOption ChainMax PainOptionsHistoricalExchange VolumeDark Pool LevelsDark Pool PrintsExchangesShort VolumeShort Interest - DailyShort InterestBorrow Fee (CTB)Failure to Deliver (FTD)ShortsTrendsNewsMore
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Market Cap
210.17M
Industry
Biotechnology
Next Earnings
Nov 4, 2026 (36d)
QSI Stats
Avg. Vol. 10 Day
1,740,824
Avg. Vol. 30 Day
2,092,720
Employees
196
Market Cap
210,172,332
Shares Out.
218,883,912
On/Off Exchange
30%/70%
6 Month Beta
3.21
1 Year Beta
3.52
2 Year Beta
2.30
3 Year Beta
2.50
52 Week Low
0.69
52 Week High
3.10
SMA50
0.77
SMA200
0.95
1 Week
+22.37%
1 Month
+23.10%
3 Month
+8.02%
6 Month
+30.14%
1 Year
-30.92%
2 Year
+8.84%
5 Year
-88.58%
Profile
at quantum-si we have a created a very unique environment where bright, highly committed individuals are given the freedom, ownership, and resources to solve tough problems and be the first to do new science. we are fully-funded by successful founders so employees can focus on creating, building, learning, and getting to market products that will change the world. if you are looking for a new challenge, check out our job postings at https://www.4catalyzer.com empower discovery. empower health. empower you.

QSI Stock Summary

Quantum-Si Incorporated Class A Common Stock (NASDAQ:QSI) stock price today is $0.9600, and today's volume is 22,869,241. QSI is up 20.792% today. The 30 day average volume is 2,092,720. QSI market cap is 210.17M with 218,883,912 shares outstanding.



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