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 $74.81 as of September 11, 2026, based on a reinvested dividends scenario. Over the same period, a $1000 investment made 5 years ago would be worth $82.77, while $1000 invested 1 year ago would be worth $615.92. This corresponds to total returns of -92.52%, -91.72%, -38.41%, respectively, with annualized returns of -35.9%, -39.26%, -38.41%.

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
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
July 27, 2026	0.79	0.78	0.78	0.81	0.77	1.08M
July 24, 2026	0.79	0.77	0.77	0.8	0.76	2.58M
July 23, 2026	0.79	0.79	0.79	0.83	0.78	3.28M
July 22, 2026	0.81	0.8	0.8	0.85	0.8	2.83M
July 21, 2026	0.82	0.84	0.84	0.85	0.82	1.45M
July 20, 2026	0.83	0.82	0.82	0.84	0.81	1.5M
July 17, 2026	0.82	0.82	0.82	0.85	0.8	2.29M
July 16, 2026	0.85	0.82	0.82	0.86	0.81	3.7M
July 15, 2026	0.87	0.86	0.86	0.89	0.86	2.24M
July 14, 2026	0.87	0.87	0.87	0.9	0.86	1.21M
July 13, 2026	0.88	0.87	0.87	0.88	0.85	3.52M
July 10, 2026	0.95	0.88	0.88	0.95	0.88	2.89M
July 09, 2026	0.91	0.96	0.96	0.97	0.9	2.56M
July 08, 2026	0.89	0.91	0.91	0.93	0.89	3.4M
July 07, 2026	0.94	0.92	0.92	0.95	0.9	3.7M
July 06, 2026	0.93	0.95	0.95	0.98	0.93	2.62M
July 02, 2026	0.93	0.93	0.93	1.01	0.92	6.03M
July 01, 2026	0.88	0.92	0.92	0.96	0.88	5.49M
June 30, 2026	0.88	0.89	0.89	0.92	0.87	3.17M
June 29, 2026	0.86	0.89	0.89	0.91	0.85	3.93M
June 26, 2026	0.84	0.85	0.85	0.89	0.8	18.79M
June 25, 2026	0.85	0.86	0.86	0.89	0.78	8.39M
June 24, 2026	0.9	0.83	0.83	0.92	0.83	5.04M
June 23, 2026	0.91	0.88	0.88	0.93	0.88	5.52M
June 22, 2026	1	0.92	0.92	1.07	0.92	5.88M
June 18, 2026	0.96	1	1	1.03	0.96	6.33M
June 17, 2026	0.97	0.94	0.94	1	0.93	3.45M
June 16, 2026	1	0.95	0.95	1	0.94	3.71M