Quantum-Si Incorporated - Class A QSI

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Quantum-Si Incorporated - Class A Common Stock · Company · Nasdaq · Healthcare / Medical Devices

Paper trade (simulated — no real money)

Fill: USD 1.4000 · FX 1 USD = 1.277900 SGD · about SGD 1.7891 per unit

Sign in to practise with simulated trades before investing real money. USD fills are converted into the SGD portfolio at the displayed rate.

Announcement types: (default: consequential filings)
Results & current reports
Capital markets
Ownership & governance

USD closing-price chart (daily close from yfinance · Last year)

USD 2.29 → 1.40 · -38.9%
2.3401.5210.702 1 2,3 4 5 6,7 8,9 10,11 12 13 14 15,16 17 18 19 Oct 25Jan 26Apr 26Jul 26Oct 26

Numbered dotted lines mark the filtered filings under Announcement Events below.

Price & SEC Filing History 24 Oct 2025 — 25 Oct 2026 (Last year)

Daily Nasdaq prices are sourced from yfinance. Yellow highlighting marks an intraday rise or a gap up between adjacent trading sessions. SEC acceptance times are converted to US Eastern time: pre-market filings appear below that day’s OHLCV row; filings accepted after the 09:30 ET open appear above it. The SEC does not publish an exact first-public-availability timestamp, so acceptance time is the best available proxy.

Weekend
Weekend
1.1503 1.4200 1.1500 1.4000 11,376,994
1.1700 1.2100 1.1450 1.1500 3,572,200
1.1600 1.2300 1.1600 1.2300 3,422,700
1.0600 1.2000 1.0400 1.1600 6,172,600
1.1450 1.1500 1.0100 1.0900 8,714,000
Weekend
Weekend
1.3300 1.3300 1.1000 1.1200 7,690,600
19 · 8-K After market open · 13:15 ET 8-K ↗
1.3500 1.3900 1.2400 1.3100 9,269,400
1.3400 1.4400 1.3300 1.3900 5,364,900
1.3450 1.4600 1.3100 1.4100 6,239,600
1.4750 1.4750 1.3400 1.3600 10,356,400
Weekend
Weekend
1.2600 1.6600 1.2580 1.5300 40,903,900
18 · 8-K After-hours · 20:12 ET 8-K ↗
1.2900 1.3000 1.2000 1.2200 5,851,500
1.1700 1.3100 1.0900 1.2800 8,037,000
1.2900 1.4100 1.1900 1.2200 8,703,200
1.5250 1.5300 1.2600 1.2800 19,185,000
Weekend
Weekend
1.3850 1.5500 1.1700 1.5500 18,774,100
1.2000 1.4800 1.1500 1.4300 33,063,400
0.9600 1.1200 0.9600 1.0700 13,838,800
0.8050 1.0300 0.8050 0.9580 23,007,100
17 · 8-K Pre-market · 00:29 ET 8-K ↗
0.8250 0.8340 0.7950 0.7950 1,562,300
Weekend
Weekend
0.7940 0.8400 0.7760 0.8340 2,593,500
0.7500 0.7990 0.7430 0.7850 1,593,300
0.7900 0.8050 0.7520 0.7590 1,476,500
0.7600 0.7920 0.7510 0.7850 2,429,900
0.7590 0.7660 0.7500 0.7560 1,122,800
Weekend
Weekend
0.7900 0.8020 0.7400 0.7450 1,708,600
0.7500 0.7960 0.7500 0.7700 2,823,600
0.7210 0.7530 0.7210 0.7300 909,700
0.7200 0.7410 0.7200 0.7200 1,164,700
0.7290 0.7480 0.7200 0.7250 1,387,900
Weekend
Weekend
0.7390 0.7550 0.7390 0.7400 1,069,100
0.7500 0.7550 0.7250 0.7390 1,712,500
0.7600 0.7750 0.7460 0.7500 1,441,900
0.7670 0.7900 0.7600 0.7600 1,049,000
No trading
Weekend
Weekend
0.7600 0.7740 0.7600 0.7660 897,300
0.7670 0.7860 0.7600 0.7610 980,000
0.7590 0.7850 0.7500 0.7610 1,615,600
0.7500 0.7770 0.7500 0.7570 1,503,700
0.7790 0.7800 0.7630 0.7660 1,133,200
Weekend
Weekend
0.8220 0.8220 0.7700 0.7800 2,412,700
0.7910 0.8340 0.7900 0.8030 1,373,600
0.8500 0.8550 0.7900 0.7910 2,662,900
0.7890 0.8590 0.7820 0.8470 4,366,300
0.8000 0.8300 0.7520 0.7690 3,853,800
Weekend
Weekend
0.7850 0.9310 0.7800 0.8350 7,825,100
0.7670 0.8100 0.7670 0.7800 3,233,600
0.7190 0.7850 0.7190 0.7700 2,863,200
0.7330 0.7440 0.7180 0.7280 1,520,300
0.7400 0.7950 0.7390 0.7440 2,429,700
Weekend
Weekend
0.7500 0.7670 0.7100 0.7400 7,000,700
16 · 10-Q After-hours · 16:55 ET 10-Q ↗ 15 · 8-K After-hours · 16:11 ET 8-K ↗
0.8550 0.9140 0.7900 0.7900 4,378,300
0.8310 0.8700 0.8260 0.8370 1,499,100
0.7950 0.8490 0.7950 0.8200 2,056,300
0.8180 0.8400 0.7900 0.7900 2,434,400
Weekend
Weekend
0.7620 0.8290 0.7620 0.8140 2,730,100
0.7520 0.7790 0.7500 0.7550 1,493,500
0.7750 0.7930 0.7570 0.7570 2,484,800
0.7640 0.7960 0.7640 0.7650 3,986,300
0.7200 0.7600 0.7110 0.7460 2,706,300
Weekend
Weekend
0.7300 0.7480 0.7100 0.7120 1,840,500
0.7260 0.7440 0.6900 0.7200 3,550,000
0.7570 0.7800 0.7020 0.7020 4,102,800
0.7750 0.7800 0.7400 0.7610 3,267,400
0.7880 0.8100 0.7720 0.7830 1,086,500
Weekend
Weekend
14 · 8-K After market open · 13:21 ET 8-K ↗
0.7940 0.8010 0.7610 0.7700 2,588,800
0.7900 0.8280 0.7810 0.7900 3,288,700
0.8100 0.8450 0.8000 0.8000 2,843,600
0.8220 0.8500 0.8220 0.8360 1,470,900
0.8300 0.8420 0.8100 0.8170 1,502,300
Weekend
Weekend
0.8200 0.8460 0.8030 0.8220 2,295,000
0.8540 0.8560 0.8060 0.8190 3,743,400
0.8730 0.8960 0.8600 0.8620 2,255,400
0.8700 0.9000 0.8610 0.8660 1,213,200
0.8800 0.8830 0.8500 0.8690 3,532,900
Weekend
Weekend
0.9460 0.9540 0.8820 0.8830 2,906,600
0.9100 0.9700 0.9020 0.9620 2,575,900
0.8860 0.9300 0.8860 0.9130 3,422,600
0.9370 0.9480 0.9010 0.9200 3,710,300
0.9280 0.9800 0.9280 0.9520 2,626,600
Weekend
Weekend
No trading
0.9260 1.0100 0.9200 0.9300 6,029,500
0.8800 0.9640 0.8790 0.9240 5,506,500
0.8800 0.9170 0.8700 0.8850 3,187,200
0.8590 0.9140 0.8500 0.8890 3,989,700
Weekend
Weekend
0.8380 0.8900 0.7950 0.8550 18,909,700
0.8500 0.8870 0.7800 0.8570 8,412,400
13 · 8-K After-hours · 16:06 ET 8-K ↗
0.9000 0.9180 0.8250 0.8270 5,134,200
0.9100 0.9300 0.8800 0.8800 5,546,400
1.0000 1.0700 0.9210 0.9210 5,934,900
Weekend
Weekend
No trading
0.9640 1.0300 0.9600 0.9990 6,343,800
0.9700 0.9960 0.9310 0.9440 3,473,100
0.9950 0.9950 0.9400 0.9540 3,727,900
1.0100 1.0500 0.9820 0.9890 9,422,200
Weekend
Weekend
0.9850 1.0100 0.9330 0.9470 3,304,200
0.9460 0.9850 0.9150 0.9730 3,444,700
0.9750 1.0200 0.9460 0.9470 3,451,900
1.0600 1.0800 0.9400 0.9870 8,116,900
1.0900 1.0950 1.0300 1.0600 4,310,400
Weekend
Weekend
1.2500 1.2500 1.0100 1.0500 8,905,000
1.1900 1.3000 1.1740 1.2800 9,559,200
1.2200 1.2200 1.1600 1.1900 7,952,200
1.1700 1.2600 1.1600 1.2400 7,380,100
1.1700 1.2500 1.1200 1.1800 7,407,300
Weekend
Weekend
1.2050 1.2100 1.1100 1.1900 7,289,700
1.1100 1.2100 1.0840 1.2000 7,411,600
1.0600 1.1850 1.0300 1.1300 8,573,700
1.0800 1.0900 1.0100 1.0800 7,550,900
No trading
Weekend
Weekend
0.9990 1.0900 0.9960 1.0600 8,816,200
0.8700 0.9900 0.8670 0.9900 11,368,900
0.8720 0.8800 0.8410 0.8760 4,706,200
0.8500 0.8670 0.8210 0.8610 3,116,000
0.8960 0.8960 0.8270 0.8540 4,577,500
Weekend
Weekend
12 · 8-K After-hours · 16:14 ET 8-K ↗
0.9050 0.9110 0.8820 0.8900 3,706,100
0.9330 0.9600 0.9050 0.9330 4,436,200
0.9300 0.9580 0.9020 0.9290 4,869,000
0.9200 1.0300 0.9000 0.9450 10,063,500
0.9000 0.9480 0.8900 0.9220 5,786,600
Weekend
Weekend
0.9500 0.9730 0.8800 0.9070 13,192,900
11 · 10-Q After-hours · 16:47 ET 10-Q ↗ 10 · 8-K After-hours · 16:13 ET 8-K ↗
1.0300 1.0300 0.9560 0.9810 7,221,000
0.9710 1.0400 0.9620 1.0300 8,075,300
0.9800 0.9840 0.9460 0.9610 2,516,000
0.9500 0.9850 0.9400 0.9720 2,873,500
Weekend
Weekend
0.9810 1.0000 0.9420 0.9580 3,590,000
0.8770 1.0200 0.8770 0.9810 11,918,800
0.9020 0.9070 0.8630 0.8650 3,449,600
0.8900 0.9400 0.8850 0.9120 3,159,400
0.9100 0.9400 0.8710 0.9000 3,118,000
Weekend
Weekend
0.9770 0.9770 0.9020 0.9060 7,282,600
1.0300 1.0400 0.9200 0.9410 7,311,000
0.9910 1.0700 0.9610 1.0600 11,054,700
1.0000 1.0500 0.9750 0.9770 5,203,100
1.0200 1.0600 0.9800 1.0100 7,820,600
Weekend
Weekend
1.0700 1.1400 1.0600 1.0700 7,021,500
1.0800 1.0900 1.0000 1.0400 7,641,500
0.9000 1.0600 0.8990 1.0500 17,707,500
0.8000 0.8630 0.8000 0.8410 3,070,600
0.7400 0.7950 0.7220 0.7890 2,650,500
Weekend
Weekend
0.7500 0.7700 0.7320 0.7410 1,881,900
0.7500 0.7600 0.7260 0.7470 2,638,600
0.7750 0.7830 0.7380 0.7510 3,189,000
0.7300 0.7320 0.6910 0.7110 3,515,300
0.7400 0.7730 0.7280 0.7290 1,890,500
Weekend
Weekend
No trading
0.7400 0.7590 0.7150 0.7480 2,571,800
9 · DEFA14A After-hours · 16:09 ET DEFA14A ↗ 8 · DEF 14A After-hours · 16:06 ET DEF 14A ↗
0.7950 0.7960 0.7450 0.7480 2,354,500
0.7580 0.7970 0.7550 0.7740 2,872,500
0.7590 0.7750 0.7250 0.7380 3,758,200
Weekend
Weekend
0.8000 0.8180 0.7560 0.7640 3,169,700
0.8560 0.8590 0.8070 0.8090 2,619,300
0.8600 0.8970 0.8600 0.8650 2,549,900
0.8900 0.9000 0.8300 0.8510 2,660,300
0.8500 0.9060 0.7920 0.8980 4,568,800
Weekend
Weekend
0.8660 0.8750 0.8310 0.8450 3,813,300
0.8800 0.8860 0.8520 0.8610 2,419,100
0.9290 0.9360 0.8810 0.8820 3,158,800
0.9460 0.9600 0.9240 0.9300 2,787,300
0.9550 0.9800 0.9410 0.9440 2,701,800
Weekend
Weekend
0.9850 1.0100 0.9330 0.9500 2,835,000
1.0200 1.0200 0.9500 0.9760 3,977,800
1.0500 1.0700 1.0000 1.0500 3,613,600
0.9400 1.1000 0.9350 1.0400 8,474,600
0.8750 0.9330 0.8500 0.9260 4,955,000
Weekend
Weekend
0.8900 0.9000 0.8420 0.8620 5,636,900
0.9000 0.9740 0.8910 0.9100 4,219,500
0.9480 0.9750 0.9100 0.9100 2,970,500
7 · 10-K After-hours · 16:34 ET 10-K ↗ 6 · 8-K After-hours · 16:08 ET 8-K ↗
0.9200 0.9750 0.8970 0.9480 3,196,900
0.9300 0.9550 0.9100 0.9330 1,840,200
Weekend
Weekend
0.9790 1.0000 0.9500 0.9560 2,595,500
1.0100 1.0250 0.9690 1.0100 2,267,900
0.9470 1.0200 0.9300 0.9900 3,162,900
0.9100 0.9550 0.9100 0.9300 1,370,200
0.9400 0.9490 0.9020 0.9120 1,888,700
Weekend
Weekend
0.9580 0.9630 0.9320 0.9410 1,754,700
0.9000 0.9820 0.8870 0.9610 3,993,500
0.9620 0.9770 0.9000 0.9060 4,913,400
0.9900 0.9920 0.9350 0.9390 3,547,300
No trading
Weekend
Weekend
0.9900 1.0500 0.9890 0.9910 3,127,800
1.0500 1.0600 0.9600 0.9750 5,890,700
1.1200 1.1200 1.0100 1.0400 4,049,000
1.1000 1.1100 1.0600 1.1000 3,669,800
1.0900 1.0900 1.0200 1.0700 3,148,000
Weekend
Weekend
1.0200 1.0900 0.9600 1.0650 7,481,600
1.0300 1.0400 0.9250 0.9320 8,157,500
1.1000 1.1100 0.9950 1.0300 6,372,600
1.1100 1.1250 1.0500 1.0900 5,044,800
1.1100 1.1300 1.0900 1.1000 3,772,000
Weekend
Weekend
1.1600 1.1860 1.1100 1.1300 5,467,500
1.2000 1.2050 1.1300 1.1700 6,195,600
1.2300 1.2400 1.1700 1.2000 3,995,900
1.2200 1.2600 1.2000 1.2300 2,862,500
1.2500 1.2700 1.2100 1.2100 3,159,300
Weekend
Weekend
1.3100 1.3200 1.2400 1.2500 4,115,600
1.2300 1.3300 1.2200 1.3100 6,410,600
1.2000 1.2350 1.1400 1.2300 4,912,100
1.2100 1.2400 1.1800 1.1900 5,735,200
No trading
Weekend
Weekend
1.2500 1.3200 1.2300 1.2700 5,462,700
1.2900 1.3000 1.2300 1.2300 3,687,400
1.2700 1.3100 1.2400 1.2700 4,428,100
1.2500 1.3200 1.2000 1.2700 5,767,900
1.2100 1.2500 1.1800 1.2100 4,925,400
Weekend
Weekend
1.2700 1.2800 1.2100 1.2200 4,460,500
1.2500 1.3100 1.2400 1.2500 4,893,100
1.2900 1.3160 1.2550 1.2600 4,107,800
1.2600 1.3400 1.2600 1.2800 7,655,000
1.1900 1.3100 1.1850 1.2600 8,340,500
Weekend
Weekend
1.1500 1.1600 1.1100 1.1600 4,871,600
No trading
1.1100 1.1500 1.0700 1.1000 5,902,300
1.1600 1.1700 1.1000 1.1100 7,955,400
5 · 8-K After-hours · 16:16 ET 8-K ↗
1.2100 1.2600 1.1700 1.1800 8,021,500
Weekend
Weekend
1.3100 1.3100 1.2200 1.2300 4,175,400
No trading
1.2400 1.3300 1.2400 1.3100 4,344,500
1.2500 1.2550 1.2000 1.2300 4,209,400
1.2800 1.3170 1.2500 1.2700 5,156,100
Weekend
Weekend
1.2200 1.2900 1.2100 1.2700 6,700,100
1.2400 1.3100 1.2100 1.2200 3,418,900
1.2400 1.2750 1.2000 1.2000 3,827,000
1.2100 1.2600 1.1800 1.2200 4,898,600
1.3100 1.3200 1.2200 1.2300 4,129,100
Weekend
Weekend
1.4000 1.4300 1.2900 1.2900 5,641,000
1.4400 1.4400 1.3450 1.4000 4,342,000
1.4200 1.4500 1.3900 1.4400 3,567,300
1.4400 1.4600 1.3900 1.4200 3,710,400
1.4700 1.5400 1.4100 1.4500 3,171,000
Weekend
Weekend
1.4800 1.4900 1.4100 1.4400 3,673,300
1.3400 1.4900 1.3400 1.4700 5,885,600
1.2800 1.3600 1.2600 1.3600 4,068,900
1.3000 1.3400 1.2700 1.2700 3,326,900
1.3600 1.3600 1.2800 1.2900 3,490,400
Weekend
Weekend
1.3600 1.4300 1.3600 1.4100 2,455,600
No trading
1.3600 1.3910 1.3100 1.3500 4,590,900
1.3600 1.3700 1.2900 1.3500 3,544,900
1.2700 1.3500 1.2600 1.3500 4,734,000
Weekend
Weekend
1.2200 1.2800 1.1900 1.2700 5,215,900
1.3700 1.4000 1.2300 1.2400 6,779,600
4 · 8-K Pre-market · 08:06 ET 8-K ↗
1.2700 1.3800 1.2500 1.2800 5,939,800
1.2800 1.3500 1.2300 1.2700 5,006,800
1.3700 1.4100 1.2600 1.3000 4,656,800
Weekend
Weekend
1.2700 1.4500 1.2700 1.3700 7,297,900
1.4950 1.5150 1.3800 1.3900 7,063,600
1.5800 1.6150 1.5200 1.5200 5,462,100
1.5850 1.6500 1.5500 1.5800 4,498,600
1.7320 1.7400 1.5900 1.5950 5,590,400
Weekend
Weekend
1.5500 1.6200 1.4600 1.5750 9,690,600
1.7650 1.7700 1.5900 1.6500 9,785,100
3 · 10-Q After-hours · 17:07 ET 10-Q ↗ 2 · 8-K After-hours · 16:09 ET 8-K ↗
1.8500 1.8900 1.7700 1.8000 8,577,200
1.8600 1.9500 1.8200 1.8400 7,175,500
2.1500 2.1850 1.9500 2.0000 9,521,700
Weekend
Weekend
2.0400 2.1600 2.0300 2.1500 6,172,900
2.0500 2.1200 2.0200 2.0300 6,739,700
1 · 424B3 After-hours · 16:05 ET 424B3 ↗
2.1400 2.2300 2.0900 2.1400 7,171,300
2.3100 2.3200 2.1400 2.1800 9,163,700
2.3800 2.4200 2.2200 2.3400 10,282,700
Weekend
Weekend
2.3200 2.4400 2.2600 2.2900 11,745,600

Announcement Events

Each title opens the filing on the SEC website. Registered users can summarise the filing and up to seven relevant exhibits linked within the same SEC submission.

19 8-K 8-K (opens SEC filing in a new tab) After market open · 13:15 ET Summarise
18 8-K 8-K (opens SEC filing in a new tab) After-hours · 20:12 ET Summarise
17 8-K 8-K (opens SEC filing in a new tab) Pre-market · 00:29 ET Summarise
16 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:55 ET Summarise
15 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:11 ET Summarise
14 8-K 8-K (opens SEC filing in a new tab) After market open · 13:21 ET Summarise
13 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:06 ET Summarise
12 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:14 ET Summarise
11 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:47 ET Summarise
10 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:13 ET Summarise
9 DEFA14A DEFA14A (opens SEC filing in a new tab) After-hours · 16:09 ET Summarise
8 DEF 14A DEF 14A (opens SEC filing in a new tab) After-hours · 16:06 ET Summarise
7 10-K 10-K (opens SEC filing in a new tab) After-hours · 16:34 ET Summarise
6 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:08 ET Summarise
5 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:16 ET Summarise
4 8-K 8-K (opens SEC filing in a new tab) Pre-market · 08:06 ET Summarise
3 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 17:07 ET Summarise
2 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:09 ET Summarise
1 424B3 424B3 (opens SEC filing in a new tab) After-hours · 16:05 ET Summarise