Quantum-Si incorporated (QSI) NASDAQ

Currency In USD

QSI Historical Return

If you invested $1000 in Quantum-Si incorporated (QSI) since IPO date, it would be worth $120.95 as of October 22, 2026, based on a reinvested dividends scenario. Over the same period, a $1000 investment made 5 years ago would be worth $147.53, while $1000 invested 1 year ago would be worth $543.18. This corresponds to total returns of -87.9%, -85.25%, -45.68%, respectively, with annualized returns of -29.92%, -31.79%, -45.68%.

Custom investment amounts or purchase dates can also be explored using the Stoculator calculator. Past performance does not guarantee future results.

QSI Historical Data

Date Range:

Date	Open	Close	Adj Close	High	Low	Volume
October 21, 2026	1.16	1.23	1.23	1.23	1.16	3.38M
October 20, 2026	1.06	1.16	1.16	1.2	1.04	6.17M
October 19, 2026	1.15	1.09	1.09	1.15	1.01	8.65M
October 16, 2026	1.33	1.12	1.12	1.33	1.1	7.6M
October 15, 2026	1.35	1.31	1.31	1.39	1.24	9.24M
October 14, 2026	1.34	1.39	1.39	1.44	1.33	5.32M
October 13, 2026	1.35	1.41	1.41	1.46	1.31	6.22M
October 12, 2026	1.48	1.36	1.36	1.48	1.34	10.26M
October 09, 2026	1.26	1.53	1.53	1.66	1.26	40.72M
October 08, 2026	1.29	1.22	1.22	1.3	1.2	5.75M
October 07, 2026	1.18	1.28	1.28	1.31	1.09	7.97M
October 06, 2026	1.29	1.22	1.22	1.41	1.19	8.63M
October 05, 2026	1.53	1.28	1.28	1.53	1.26	19.1M
October 02, 2026	1.39	1.55	1.55	1.55	1.17	18.67M
October 01, 2026	1.2	1.43	1.43	1.48	1.15	32.57M
September 30, 2026	0.96	1.07	1.07	1.12	0.96	12.41M
September 29, 2026	0.81	0.96	0.96	1.03	0.81	22.9M
September 28, 2026	0.83	0.8	0.8	0.83	0.8	1.56M
September 25, 2026	0.79	0.83	0.83	0.84	0.78	2.57M
September 24, 2026	0.75	0.79	0.79	0.8	0.74	1.58M
September 23, 2026	0.79	0.76	0.76	0.81	0.75	1.45M
September 22, 2026	0.76	0.78	0.78	0.79	0.75	2.4M
September 21, 2026	0.76	0.76	0.76	0.77	0.75	1.12M
September 18, 2026	0.79	0.75	0.75	0.8	0.74	1.71M
September 17, 2026	0.75	0.77	0.77	0.8	0.75	2.82M
September 16, 2026	0.72	0.73	0.73	0.75	0.72	909,610
September 15, 2026	0.72	0.72	0.72	0.74	0.72	1.16M
September 11, 2026	0.74	0.74	0.74	0.75	0.74	1.06M
September 10, 2026	0.75	0.74	0.74	0.76	0.73	1.71M
September 09, 2026	0.76	0.75	0.75	0.77	0.75	1.44M
September 08, 2026	0.77	0.76	0.76	0.79	0.76	1.05M
September 04, 2026	0.76	0.77	0.77	0.77	0.76	896,178
September 03, 2026	0.77	0.76	0.76	0.79	0.76	0
September 02, 2026	0.76	0.76	0.76	0.79	0.75	1.61M
September 01, 2026	0.75	0.76	0.76	0.78	0.75	1.5M
August 31, 2026	0.78	0.77	0.77	0.78	0.76	1.13M
August 28, 2026	0.82	0.78	0.78	0.82	0.77	2.41M
August 27, 2026	0.79	0.8	0.8	0.83	0.79	1.37M
August 26, 2026	0.85	0.79	0.79	0.86	0.79	2.64M
August 25, 2026	0.79	0.85	0.85	0.86	0.78	4.36M
August 24, 2026	0.8	0.77	0.77	0.83	0.75	3.81M
August 21, 2026	0.78	0.84	0.84	0.93	0.78	7.78M
August 20, 2026	0.77	0.78	0.78	0.81	0.77	3.23M
August 19, 2026	0.72	0.77	0.77	0.78	0.72	0
August 18, 2026	0.73	0.73	0.73	0.74	0.72	1.49M
August 17, 2026	0.74	0.74	0.74	0.8	0.74	2.42M
August 14, 2026	0.75	0.74	0.74	0.77	0.71	6.97M
August 13, 2026	0.86	0.79	0.79	0.91	0.79	0
August 12, 2026	0.83	0.84	0.84	0.87	0.83	0
August 11, 2026	0.8	0.82	0.82	0.85	0.8	0
August 10, 2026	0.82	0.79	0.79	0.84	0.79	2.43M
August 07, 2026	0.76	0.81	0.81	0.83	0.76	0
August 06, 2026	0.75	0.76	0.76	0.78	0.75	1.45M
August 05, 2026	0.78	0.76	0.76	0.79	0.76	2.47M
August 04, 2026	0.76	0.77	0.77	0.8	0.76	3.98M
August 03, 2026	0.72	0.75	0.75	0.76	0.71	2.69M
July 31, 2026	0.73	0.71	0.71	0.75	0.71	1.84M
July 30, 2026	0.71	0.72	0.72	0.74	0.69	3.54M
July 29, 2026	0.76	0.7	0.7	0.78	0.7	4.04M
July 28, 2026	0.78	0.76	0.76	0.78	0.74	3.27M