Quantum-Si Incorporated - Class A QSI

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Quantum-Si Incorporated - Class A Common Stock · Company · Nasdaq

Paper trade (simulated — no real money)

Fill: USD 0.7700 · FX 1 USD = 1.288650 SGD · about SGD 0.9923 per unit

Sign in to place simulated trades. 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 1.79 → 0.77 · -57.0%
2.6301.6700.711 1,2 3 4,5 6 7 8 9,10 11 12 13,14 15,16 17,18 19 20 21 Jul 25Oct 25Jan 26Apr 26Jul 26

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

Price & SEC Filing History 26 Jul 2025 — 27 Jul 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.

No data yet
Weekend
Weekend
21 · 8-K After-hours · 17:21 ET 8-K ↗
0.7940 0.8010 0.7610 0.7700 2,584,700
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
20 · 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
19 · 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
18 · 10-Q After-hours · 16:47 ET 10-Q ↗ 17 · 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
16 · DEFA14A After-hours · 16:09 ET DEFA14A ↗ 15 · 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
14 · 10-K After-hours · 16:34 ET 10-K ↗ 13 · 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
12 · 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
11 · 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
10 · 10-Q After-hours · 17:07 ET 10-Q ↗ 9 · 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
8 · 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
2.3800 2.3800 2.1700 2.2000 12,164,800
2.2150 2.3400 2.0000 2.2000 18,410,400
2.4750 2.5200 2.2700 2.3400 15,333,700
2.4200 2.7300 2.3900 2.5850 22,176,500
Weekend
Weekend
2.3800 2.5250 2.2600 2.2800 20,988,700
2.8100 3.1000 2.5000 2.5400 49,550,500
2.4500 2.7500 2.3550 2.6300 53,572,300
2.0100 2.2600 1.9600 2.1500 23,794,600
1.7500 2.1300 1.7300 2.0800 33,370,600
Weekend
Weekend
1.8100 1.9500 1.6600 1.6700 21,776,900
7 · S-3/A After-hours · 17:26 ET S-3/A ↗
1.7700 1.8000 1.6900 1.7400 6,852,600
1.7600 1.8200 1.7000 1.7700 8,810,700
1.8500 1.9200 1.6800 1.7700 18,189,400
1.7100 1.8700 1.6600 1.8100 17,235,700
Weekend
Weekend
1.5700 1.7600 1.5600 1.7200 19,291,700
1.4900 1.5600 1.4600 1.5400 8,024,400
1.4200 1.5000 1.4100 1.4600 5,506,600
1.3600 1.4400 1.3500 1.4100 5,733,700
6 · 8-K After-hours · 16:07 ET 8-K ↗
1.4000 1.4250 1.3500 1.3900 9,550,000
Weekend
Weekend
5 · 8-K After-hours · 16:01 ET 8-K ↗ 4 · S-3 After-hours · 17:15 ET S-3 ↗
1.5400 1.6100 1.4700 1.4900 7,793,700
1.5200 1.5500 1.4400 1.5100 10,700,600
1.6400 1.7500 1.5900 1.6100 13,282,700
1.7800 1.7900 1.5600 1.6000 21,284,400
1.5250 1.7300 1.4300 1.7000 24,913,400
Weekend
Weekend
1.4700 1.6000 1.4500 1.5000 23,200,200
1.3100 1.6400 1.3000 1.5300 37,180,100
1.3000 1.3400 1.2400 1.2600 10,309,300
1.2900 1.3400 1.2500 1.3300 7,290,700
1.2000 1.2900 1.1800 1.2600 8,873,000
Weekend
Weekend
1.2200 1.2600 1.1700 1.1800 6,110,600
1.1100 1.2200 1.1100 1.2000 7,399,200
1.1500 1.1550 1.0800 1.1200 4,230,900
1.0600 1.1600 1.0600 1.1500 3,994,100
1.0900 1.1000 1.0400 1.0600 4,089,700
Weekend
Weekend
1.0700 1.1000 1.0300 1.0800 3,433,300
1.0700 1.0800 1.0300 1.0700 3,698,800
1.0800 1.1100 1.0300 1.0700 3,838,600
1.1000 1.1300 1.0700 1.0800 4,078,700
No trading
Weekend
Weekend
1.1350 1.1500 1.1000 1.1200 3,471,800
1.1900 1.2200 1.1300 1.1500 4,261,900
1.1600 1.2200 1.1500 1.1600 5,191,500
1.1300 1.1800 1.1100 1.1700 3,624,400
1.1300 1.1700 1.1100 1.1400 3,877,400
Weekend
Weekend
1.1000 1.1600 1.0600 1.1400 6,872,500
0.9830 1.1400 0.9800 1.1100 9,296,900
1.0100 1.0200 0.9500 1.0000 11,048,300
1.1300 1.1350 1.0200 1.0300 7,997,600
1.1100 1.1200 1.0900 1.0900 4,931,100
Weekend
Weekend
1.1300 1.1400 1.0900 1.1000 5,863,600
1.1800 1.1900 1.0800 1.1200 9,810,800
1.1900 1.2050 1.1400 1.1700 7,961,100
1.2000 1.2150 1.1400 1.1600 9,815,400
1.2700 1.2800 1.1800 1.2000 8,681,800
Weekend
Weekend
3 · 8-K After-hours · 16:57 ET 8-K ↗
1.3300 1.3450 1.2600 1.2700 6,536,100
1.3600 1.3800 1.3100 1.3300 4,185,200
1.3600 1.3870 1.2700 1.3700 8,481,600
2 · 10-Q After-hours · 16:36 ET 10-Q ↗ 1 · 8-K After-hours · 16:09 ET 8-K ↗
1.4600 1.4770 1.4000 1.4400 7,832,900
1.4900 1.4900 1.4300 1.4400 4,385,100
Weekend
Weekend
1.4200 1.4900 1.4000 1.4600 4,434,700
1.6200 1.6200 1.4700 1.4800 11,156,600
1.7000 1.7000 1.6100 1.6200 4,441,700
1.8000 1.8000 1.6000 1.6350 9,424,000
1.9300 1.9450 1.7600 1.7900 6,785,400
Weekend
Weekend

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.

21 8-K 8-K (opens SEC filing in a new tab) After-hours · 17:21 ET Summarise
20 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:06 ET Summarise
19 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:14 ET Summarise
18 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:47 ET Summarise
17 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:13 ET Summarise
16 DEFA14A DEFA14A (opens SEC filing in a new tab) After-hours · 16:09 ET Summarise
15 DEF 14A DEF 14A (opens SEC filing in a new tab) After-hours · 16:06 ET Summarise
14 10-K 10-K (opens SEC filing in a new tab) After-hours · 16:34 ET Summarise
13 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:08 ET Summarise
12 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:16 ET Summarise
11 8-K 8-K (opens SEC filing in a new tab) Pre-market · 08:06 ET Summarise
10 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 17:07 ET Summarise
9 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:09 ET Summarise
8 424B3 424B3 (opens SEC filing in a new tab) After-hours · 16:05 ET Summarise
7 S-3/A S-3/A (opens SEC filing in a new tab) After-hours · 17:26 ET Summarise
6 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:07 ET Summarise
5 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:01 ET Summarise
4 S-3 S-3 (opens SEC filing in a new tab) After-hours · 17:15 ET Summarise
3 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:57 ET Summarise
2 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:36 ET Summarise
1 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:09 ET Summarise