NASDAQ · QSI

Quantum-Si incorporated

Healthcare · Biotechnology

$1.15

Up+$0.26 (+22.17%)

Updated Oct 23, 2026, 6:57 PM

SID Score

5.7/10

Composite research score

Smart Money

—

Institutional and insider signal

Price performance · QSI

QSI price history

1M range · 21 trading sessions · Daily adjusted prices

Prices through Oct 22, 2026

Daily close

View OHLC price history

QSI OHLC price history, latest 40 sessions
Date	Open	High	Low	Close	Volume
Oct 22, 2026	$1.17	$1.21	$1.145	$1.15	3.57M
Oct 21, 2026	$1.16	$1.23	$1.16	$1.23	3.42M
Oct 20, 2026	$1.06	$1.20	$1.04	$1.16	6.18M
Oct 19, 2026	$1.145	$1.15	$1.01	$1.09	8.71M
Oct 16, 2026	$1.33	$1.33	$1.10	$1.12	7.69M
Oct 15, 2026	$1.35	$1.39	$1.24	$1.31	9.27M
Oct 14, 2026	$1.34	$1.44	$1.3301	$1.39	5.36M
Oct 13, 2026	$1.345	$1.46	$1.31	$1.41	6.24M
Oct 12, 2026	$1.475	$1.475	$1.34	$1.36	10.36M
Oct 9, 2026	$1.26	$1.66	$1.258	$1.53	40.9M
Oct 8, 2026	$1.29	$1.30	$1.20	$1.22	5.85M
Oct 7, 2026	$1.17	$1.3099	$1.09	$1.28	8.04M
Oct 6, 2026	$1.29	$1.41	$1.19	$1.22	8.7M
Oct 5, 2026	$1.525	$1.53	$1.2601	$1.28	19.19M
Oct 2, 2026	$1.385	$1.55	$1.17	$1.55	18.77M
Oct 1, 2026	$1.20	$1.48	$1.15	$1.43	33.06M
Sep 30, 2026	$0.96	$1.12	$0.96	$1.07	13.84M
Sep 29, 2026	$0.805	$1.03	$0.805	$0.9581	23.01M
Sep 28, 2026	$0.825	$0.8338	$0.795	$0.795	1.57M
Sep 25, 2026	$0.7943	$0.84	$0.7755	$0.8343	2.59M
Sep 24, 2026	$0.75	$0.7991	$0.7434	$0.785	1.59M