Arqit Quantum Inc ARQQ

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Arqit Quantum Inc. - Ordinary Shares · Company · Nasdaq

Paper trade (simulated — no real money)

Fill: USD 16.6500 · FX 1 USD = 1.288650 SGD · about SGD 21.4560 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 36.74 → 16.65 · -54.7%
58.27035.02511.780 1 2 3 4,5,6 7 8 9 10,11,12,13 14,15 16 17 18 19 20 21,22 23 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
18.4800 18.7800 16.6300 16.6500 285,400
17.2900 19.3700 17.1900 18.3500 326,100
17.4500 19.1470 17.1900 18.0800 433,300
17.7200 18.0840 16.6100 17.2000 314,200
17.3500 17.8650 16.8500 17.2100 267,900
Weekend
Weekend
16.2900 18.1440 16.0600 17.4200 351,700
17.7000 18.1300 16.2400 16.5300 486,900
19.0200 19.5300 17.7200 18.2500 449,200
18.2300 18.9300 17.9400 18.7300 286,100
18.6000 18.7950 17.4020 18.0200 544,700
Weekend
Weekend
20.7000 21.0000 18.6040 19.0800 557,100
20.0500 21.3300 19.5300 20.4700 483,800
19.2300 21.4800 19.1900 20.0500 612,900
21.7300 21.7300 18.9500 19.8400 1,093,600
24.4600 24.8200 21.7700 22.1300 716,800
Weekend
Weekend
No trading
28.7000 28.7450 23.2000 23.5150 1,126,800
29.2600 30.9800 28.2900 28.8500 787,000
26.7800 30.3300 25.9130 29.7200 1,232,700
24.8000 28.5860 24.0000 27.3100 1,006,700
Weekend
Weekend
26.5000 28.1400 24.1100 24.2600 698,700
26.7400 29.1500 25.0400 27.3200 907,000
28.2100 29.2900 24.5100 28.6400 1,709,700
21.0500 29.8900 21.0500 29.0400 3,270,200
23.6200 24.3900 20.2900 21.4200 1,466,800
Weekend
Weekend
No trading
23.3050 25.7000 21.0100 24.3800 5,673,000
19.8900 24.0900 19.5000 22.6000 2,777,700
23 · 6-K Pre-market · 07:15 ET FORM 6-K ↗
17.3800 20.5300 17.0000 19.9400 2,305,100
14.3700 18.6300 14.3700 17.9200 3,048,900
Weekend
Weekend
13.4900 14.0700 13.1670 13.6000 393,600
13.0500 13.8400 12.7700 13.6900 494,900
12.1600 13.9080 12.1600 13.0900 580,200
13.2000 14.1600 12.0700 12.4900 850,300
12.6600 13.2500 12.3000 12.8200 493,500
Weekend
Weekend
13.9000 14.0130 11.8000 12.1400 802,900
14.3100 14.8300 14.0100 14.2200 533,500
15.8100 15.9600 14.5500 14.6400 740,900
17.2400 17.5400 15.8800 16.2700 635,100
16.2300 17.3300 15.8800 16.9600 502,800
Weekend
Weekend
16.8100 17.0200 15.9200 16.5100 475,100
16.0000 17.7990 15.8750 16.9100 1,051,100
16.4700 16.4700 15.3800 16.1000 658,000
18.0400 18.0400 15.9000 16.5900 1,085,000
No trading
Weekend
Weekend
16.7600 19.0000 16.4900 17.4900 2,187,100
13.9550 17.4000 13.8100 16.4500 2,105,400
22 · 424B3 Pre-market · 08:26 ET 424B3 ↗ 21 · 6-K Pre-market · 08:20 ET FORM 6-K ↗
12.1700 13.2100 12.1600 13.0900 334,600
12.5000 12.5500 11.9140 12.1700 378,400
13.2800 13.3200 12.4200 12.7400 372,700
Weekend
Weekend
13.5300 13.5300 12.9100 13.3400 336,500
13.7400 14.2600 12.9050 13.8700 465,400
14.1000 14.2400 13.5000 13.8300 406,100
15.0600 15.6000 13.9000 14.4000 505,700
14.6600 15.5000 14.2000 15.0000 487,400
Weekend
Weekend
15.4300 15.4800 14.5100 14.9600 626,800
15.4300 16.2400 15.0500 15.4300 627,800
14.9900 15.7500 14.7500 15.6800 544,700
14.6200 14.8700 13.9530 14.6500 247,600
14.6000 15.1900 14.3700 14.4200 244,900
Weekend
Weekend
14.5700 14.6400 13.9700 14.5200 240,600
20 · 6-K Pre-market · 07:58 ET FORM 6-K ↗
13.1600 14.4100 13.1200 14.3600 265,900
14.0100 14.1050 13.0360 13.2200 281,100
14.3800 14.4610 13.8850 14.0900 186,500
14.3900 15.0000 14.2500 14.5800 222,900
Weekend
Weekend
14.5500 14.8600 13.7020 14.5300 314,400
15.4000 15.5000 14.1400 14.4500 331,600
15.4800 16.1900 15.2700 15.7600 354,900
16.1900 16.9000 14.8000 14.8500 619,600
15.4300 16.3850 15.4000 16.1500 484,500
Weekend
Weekend
16.2550 16.7350 15.8600 16.0300 740,400
17.6100 17.6950 15.5800 15.7700 1,100,500
15.2500 16.6000 15.0100 16.2300 1,199,100
13.6500 14.6700 13.6500 13.9700 381,400
12.3000 13.3500 11.9100 13.2400 202,400
19 · 6-K Pre-market · 06:00 ET FORM 6-K ↗
Weekend
Weekend
12.4900 12.8500 12.4000 12.5300 99,200
12.7300 12.9900 12.3600 12.4400 160,200
13.7600 13.9700 12.6100 12.8600 189,600
13.0000 13.1400 12.2100 12.5500 147,200
13.7600 14.2500 13.1700 13.3200 153,500
Weekend
Weekend
No trading
12.7400 13.9900 12.3100 13.9700 188,400
13.7000 14.2800 13.2500 13.5900 210,700
12.0100 13.3200 12.0100 13.2500 255,000
11.9100 12.1800 11.5200 11.9000 173,100
Weekend
Weekend
12.5800 12.5800 11.5900 11.7800 206,100
13.1900 13.5800 12.7400 12.7700 139,500
13.9400 14.3710 13.3500 13.6200 124,100
14.2100 14.3800 13.5400 13.5700 147,000
13.5500 14.5000 13.2000 14.3800 221,300
Weekend
Weekend
13.7000 14.1500 13.1600 13.6000 204,400
13.4400 14.0000 12.9100 13.8700 216,600
14.0000 14.3980 13.6000 13.6300 146,800
13.9700 14.6000 13.8750 14.1600 154,900
13.9700 14.3300 13.6300 13.9950 129,500
Weekend
Weekend
14.2000 14.7500 13.6100 13.6300 171,900
14.5100 14.8640 14.0400 14.0500 132,200
15.2600 15.5400 14.4200 14.7500 259,700
15.7200 15.8390 15.0000 15.0900 247,000
15.0700 15.5700 14.6800 15.4800 285,500
Weekend
Weekend
15.7000 16.3300 15.3600 15.4100 183,000
16.2400 16.7300 15.6900 15.9200 185,700
18 · 6-K After-hours · 16:01 ET FORM 6-K ↗
16.2000 16.7500 16.0100 16.6600 142,200
15.9800 16.3100 15.3100 15.9300 150,000
15.7200 16.9300 15.4340 16.8600 183,700
Weekend
Weekend
16.5500 16.6260 16.0100 16.4600 247,200
17.2700 17.8100 16.8400 17.4600 327,800
17.0950 17.5400 16.7100 16.8400 253,100
15.2600 16.4950 15.2600 16.3900 231,900
15.5500 15.6730 15.0200 15.3050 178,000
Weekend
Weekend
16.6300 17.0000 15.7500 15.8500 378,900
16.0000 16.8700 15.8200 16.8100 153,000
16.4500 17.0400 15.8500 16.2600 149,200
16.9000 16.9000 16.0620 16.5300 157,800
No trading
Weekend
Weekend
17.1550 17.4500 16.4000 17.0000 133,900
17.3200 17.3300 15.8900 16.7800 253,900
17.7700 17.8870 16.5900 17.3200 234,900
18.3100 18.5990 17.5000 17.5600 223,900
18.8700 19.0900 18.1100 18.5000 292,800
Weekend
Weekend
16.8900 19.2100 16.8100 18.5900 462,400
17.4800 18.1400 16.0000 16.1200 365,500
19.7600 19.7650 17.6000 18.3200 343,300
20.2400 20.5760 18.5390 19.7900 335,700
20.0200 20.9200 19.5100 20.1700 289,300
Weekend
Weekend
21.6400 22.0400 20.0000 20.3200 324,000
22.9300 22.9300 21.5100 22.2700 280,700
23.9600 24.0000 22.6630 23.0900 266,300
22.9400 23.9500 22.6600 23.3100 246,100
17 · 424B5 After-hours · 16:21 ET 424B5 ↗
24.5400 24.8240 22.9100 23.2700 215,900
Weekend
Weekend
16 · F-3/A After-hours · 16:01 ET F-3/A ↗
25.3100 25.3100 23.9120 24.2000 177,700
25.3500 26.1000 25.0000 25.3500 262,600
25.2800 26.3700 23.2200 24.9600 248,000
24.5600 26.5000 24.0000 25.1500 312,500
No trading
Weekend
Weekend
26.8800 27.7700 26.3450 26.6000 200,800
26.6100 28.1500 26.1200 26.9700 283,200
26.0600 26.8500 25.2700 26.6100 315,400
26.7000 27.1600 24.6700 26.1800 441,000
15 · F-3 After-hours · 16:09 ET F-3 ↗
26.1500 27.0000 25.2310 26.6000 289,800
14 · 6-K Pre-market · 08:32 ET FORM 6-K ↗
Weekend
Weekend
27.8000 28.1680 26.5600 26.8700 346,600
27.0000 27.6700 26.5500 27.2800 180,900
27.4000 27.7300 26.6840 27.0000 168,400
28.2900 28.6400 26.5000 27.6300 346,300
25.1500 29.2020 25.1500 27.8800 640,500
Weekend
Weekend
22.7800 24.7320 21.6000 24.5400 391,500
No trading
21.8500 22.2500 21.4290 21.8800 327,600
21.7200 22.4580 21.6900 21.9400 319,600
22.1500 23.2500 21.6250 21.7200 407,600
Weekend
Weekend
24.9400 24.9400 22.7200 22.8100 425,300
No trading
25.0700 25.3780 24.2700 25.2900 204,500
25.8900 26.0600 24.7000 25.3200 288,400
26.0000 28.0900 25.8000 26.4900 389,100
Weekend
Weekend
23.9900 26.2250 23.9900 25.4900 537,400
23.1600 25.0000 23.1440 23.9300 325,900
25.0200 25.7290 22.3800 22.4600 420,500
24.0100 25.1850 23.6500 24.7300 352,500
28.1600 28.3250 24.1500 24.3500 613,200
Weekend
Weekend
28.9800 30.4520 27.6500 28.3500 362,300
27.8800 29.9800 27.5000 29.7000 212,100
29.8300 29.8800 28.3000 28.9700 224,800
28.0700 30.0000 27.0400 29.6300 360,000
13 · 424B3 Pre-market · 08:40 ET 424B3 ↗ 12 · 424B3 Pre-market · 08:40 ET 424B3 ↗ 11 · 6-K Pre-market · 08:39 ET FORM 6-K ↗ 10 · 20-F Pre-market · 08:25 ET 20-F ↗
30.3750 30.3750 28.1200 29.6300 395,900
Weekend
Weekend
31.2800 31.7500 29.5200 30.4300 342,400
29.8200 31.6900 28.9000 31.5000 656,200
27.9600 30.0750 26.6900 29.5400 245,600
26.6000 28.3770 26.4000 27.5800 216,800
27.3500 27.8300 26.2900 26.4200 268,800
Weekend
Weekend
28.0100 28.8800 27.0500 28.5100 209,000
No trading
26.9400 27.9000 26.4000 27.5700 331,400
26.4600 26.4600 24.6300 25.7400 251,000
24.5100 26.4800 24.0100 26.2900 348,900
Weekend
Weekend
24.5500 24.7600 21.5870 24.3700 559,200
28.1800 29.9000 24.1150 24.2700 476,300
27.2900 28.2700 26.7000 27.1600 468,200
25.5300 26.9000 24.6020 26.4600 501,200
27.8350 28.5900 25.6100 25.9600 434,200
Weekend
Weekend
25.5600 29.3800 25.4300 27.4800 917,000
29.2500 29.6900 27.3000 27.5300 623,000
31.5000 32.7200 29.8600 30.3200 362,900
30.9000 32.3200 30.6200 31.4100 345,800
36.1600 36.4980 31.8500 32.1900 667,800
Weekend
Weekend
30.4700 34.5100 29.8600 33.8400 607,300
34.9500 35.0000 31.3940 31.9700 508,500
36.5400 36.8700 33.6000 34.2500 748,700
38.5200 40.3000 36.0000 36.0100 539,800
43.3600 43.3600 38.5000 40.7300 699,700
Weekend
Weekend
43.3400 46.2000 42.4350 43.6300 484,200
43.1100 44.5500 41.5000 42.3900 450,200
43.0000 46.6500 41.8000 45.3700 653,500
47.0100 48.0000 42.0000 42.9900 735,600
45.4300 49.3300 43.5130 47.0400 1,068,200
Weekend
Weekend
41.3900 44.1900 40.3300 42.7100 868,100
38.9100 39.9900 36.3950 39.0300 930,900
37.5850 37.7930 33.6000 35.0800 1,123,300
38.9950 40.5390 37.8000 38.5500 516,000
9 · 6-K Pre-market · 09:11 ET FORM 6-K ↗
42.6700 43.1630 38.9100 39.5600 832,300
Weekend
Weekend
40.5600 41.6350 37.8500 41.4900 1,176,100
53.6000 53.6000 38.8100 39.5600 3,037,600
60.5300 61.1100 50.1000 53.4700 1,345,400
57.0000 60.5000 53.5330 58.1600 884,600
50.8600 58.8000 50.8500 58.2700 1,238,100
Weekend
Weekend
53.8800 54.3500 48.0000 48.5200 818,900
52.0000 55.8600 50.2550 53.8800 700,600
8 · 6-K Pre-market · 09:12 ET FORM 6-K ↗
56.8200 62.0000 50.7200 54.2100 1,158,600
56.2900 59.6200 52.3100 55.2300 1,127,500
50.0000 54.6500 47.3000 53.8600 1,069,200
Weekend
Weekend
50.3500 52.3000 47.7700 49.9200 1,289,200
41.8100 48.8000 41.0600 48.5900 1,101,600
37.9840 41.6680 37.0830 41.2000 573,500
35.0600 38.9800 34.7630 38.7500 548,000
37.5500 38.8920 34.9000 35.3000 495,300
Weekend
Weekend
38.0400 39.6000 36.3800 36.4500 592,900
38.1400 39.8340 36.8000 38.4500 819,500
41.0000 45.2900 38.1000 42.1200 1,115,800
42.1000 42.6500 38.7700 40.5900 745,100
40.0750 41.3300 36.0000 41.2700 952,800
Weekend
Weekend
7 · 424B3 After-hours · 16:43 ET 424B3 ↗
37.0000 42.2100 37.0000 41.7300 1,395,400
36.3200 37.6700 35.0000 37.4000 739,700
32.8600 35.5900 31.1600 35.4200 636,000
33.5100 34.9000 32.2000 33.0900 366,800
6 · F-3/A After-hours · 16:03 ET F-3/A ↗ 5 · 424B5 After-hours · 16:02 ET 424B5 ↗ 4 · 6-K After-hours · 16:01 ET FORM 6-K ↗
33.5800 34.0000 32.3200 33.1600 417,500
Weekend
Weekend
30.2600 33.8500 30.0600 33.7100 644,700
3 · 6-K After-hours · 16:01 ET FORM 6-K ↗
27.9200 30.5000 27.9200 30.2550 299,100
28.7500 29.4800 27.5100 27.8000 232,200
26.7000 28.1400 26.5500 28.1200 275,000
27.9000 28.2100 26.3100 26.6300 299,600
Weekend
Weekend
28.0900 28.4600 26.9470 27.8500 145,400
27.1700 27.6140 26.4080 27.4050 188,200
27.9300 28.8400 27.1000 27.7700 224,900
28.3000 29.4100 27.1800 27.7400 331,200
No trading
Weekend
Weekend
2 · F-3 After-hours · 16:04 ET F-3 ↗
31.6500 31.9350 29.9600 30.0000 200,100
31.3700 32.4000 30.9700 31.8900 236,300
1 · 6-K Pre-market · 06:05 ET FORM 6-K ↗
31.3900 31.6000 30.3530 30.4100 198,400
30.8400 32.0000 30.8000 31.5700 228,100
30.5100 31.3000 29.5000 30.8400 203,200
Weekend
Weekend
28.5400 30.8700 28.5000 30.8100 278,700
29.0000 29.1290 27.8200 28.6200 263,600
29.5000 29.9100 27.2900 29.3300 516,600
32.5000 32.5000 29.7910 29.9800 343,000
32.4000 32.5600 30.8600 32.5100 255,600
Weekend
Weekend
31.8900 32.9600 30.8000 32.9500 281,600
33.1100 33.6100 31.1500 32.4600 539,500
34.7600 35.5000 33.8100 34.5800 437,000
32.9500 34.3900 31.9900 34.1300 398,000
32.7500 34.3560 31.5100 32.8900 361,800
Weekend
Weekend
33.2900 34.2000 32.1400 32.3300 318,000
34.7000 35.0780 31.8800 32.3400 455,300
36.1600 36.2100 33.7000 34.7400 463,000
36.2200 37.8200 35.1500 37.3800 516,900
33.4900 35.3200 32.5380 35.2900 375,600
Weekend
Weekend
31.4600 33.1350 30.8900 32.3500 431,800
34.8700 35.8900 33.1200 33.2450 526,300
34.2500 35.5000 32.7700 33.3500 385,900
36.3300 37.1370 33.6200 34.0100 634,500
38.5100 38.8350 35.2700 36.7400 697,200
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.

23 6-K FORM 6-K (opens SEC filing in a new tab) Pre-market · 07:15 ET Summarise
22 424B3 424B3 (opens SEC filing in a new tab) Pre-market · 08:26 ET Summarise
21 6-K FORM 6-K (opens SEC filing in a new tab) Pre-market · 08:20 ET Summarise
20 6-K FORM 6-K (opens SEC filing in a new tab) Pre-market · 07:58 ET Summarise
19 6-K FORM 6-K (opens SEC filing in a new tab) Pre-market · 06:00 ET Summarise
18 6-K FORM 6-K (opens SEC filing in a new tab) After-hours · 16:01 ET Summarise
17 424B5 424B5 (opens SEC filing in a new tab) After-hours · 16:21 ET Summarise
16 F-3/A F-3/A (opens SEC filing in a new tab) After-hours · 16:01 ET Summarise
15 F-3 F-3 (opens SEC filing in a new tab) After-hours · 16:09 ET Summarise
14 6-K FORM 6-K (opens SEC filing in a new tab) Pre-market · 08:32 ET Summarise
13 424B3 424B3 (opens SEC filing in a new tab) Pre-market · 08:40 ET Summarise
12 424B3 424B3 (opens SEC filing in a new tab) Pre-market · 08:40 ET Summarise
11 6-K FORM 6-K (opens SEC filing in a new tab) Pre-market · 08:39 ET Summarise
10 20-F 20-F (opens SEC filing in a new tab) Pre-market · 08:25 ET Summarise
9 6-K FORM 6-K (opens SEC filing in a new tab) Pre-market · 09:11 ET Summarise
8 6-K FORM 6-K (opens SEC filing in a new tab) Pre-market · 09:12 ET Summarise
7 424B3 424B3 (opens SEC filing in a new tab) After-hours · 16:43 ET Summarise
6 F-3/A F-3/A (opens SEC filing in a new tab) After-hours · 16:03 ET Summarise
5 424B5 424B5 (opens SEC filing in a new tab) After-hours · 16:02 ET Summarise
4 6-K FORM 6-K (opens SEC filing in a new tab) After-hours · 16:01 ET Summarise
3 6-K FORM 6-K (opens SEC filing in a new tab) After-hours · 16:01 ET Summarise
2 F-3 F-3 (opens SEC filing in a new tab) After-hours · 16:04 ET Summarise
1 6-K FORM 6-K (opens SEC filing in a new tab) Pre-market · 06:05 ET Summarise