Arqit Quantum Inc ARQQ

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Arqit Quantum Inc. - Ordinary Shares · Company · Nasdaq · Technology / Software - Infrastructure

Paper trade (simulated — no real money)

Fill: USD 16.4100 · FX 1 USD = 1.277900 SGD · about SGD 20.9703 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 47.04 → 16.41 · -65.1%
47.04029.41011.780 1,2,3,4 5,6 7 8 9 10 11 12,13 14 15 16 17 Oct 25Jan 26Apr 26Jul 26Oct 26

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

Price & SEC Filing History 25 Oct 2025 — 26 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.

No data yet
Weekend
Weekend
15.7500 16.9499 15.5100 16.4100 147,457
16.1500 16.7700 15.4950 15.8100 217,900
15.4500 16.7300 15.3560 16.4000 264,900
13.6400 15.6300 13.5000 15.3100 224,100
14.6200 14.6400 13.3700 14.0200 402,200
Weekend
Weekend
15.9900 16.0600 13.9200 14.0200 400,900
14.9700 15.9000 14.5000 15.9000 325,800
16.4200 16.5260 15.3200 15.3700 309,700
16.4700 17.1900 16.2100 16.8400 232,100
17.2700 17.9740 16.5800 16.6550 292,300
Weekend
Weekend
19.2200 19.3550 16.2850 17.2300 741,300
17 · 6-K After-hours · 20:01 ET FORM 6-K ↗
22.1500 22.5000 17.8100 18.4300 828,900
22.3300 22.6860 22.0000 22.5500 171,000
23.9800 24.8000 23.3320 23.4300 156,900
24.3400 24.4400 23.4800 23.6800 166,200
Weekend
Weekend
24.3000 24.9280 24.0800 24.6200 194,000
24.0000 24.1600 23.0500 23.9500 129,700
24.4800 25.0000 23.9000 24.0600 160,300
24.8600 25.1000 23.8000 24.1200 212,400
24.3000 24.8600 23.5600 24.6400 194,000
Weekend
Weekend
23.1600 24.9900 22.4900 24.6000 370,300
21.9400 23.6100 21.7000 23.1200 262,400
23.3000 23.5450 22.0200 22.5400 236,800
23.5100 24.4990 22.5200 23.0400 389,000
20.5500 23.6800 20.5300 23.5300 463,500
Weekend
Weekend
19.7600 20.4800 18.4130 20.1300 655,300
19.5900 19.9500 19.2500 19.5200 246,500
18.2100 19.3300 18.0800 19.0100 490,700
16.6600 19.0000 16.4010 18.2700 768,700
19.2200 19.2200 16.0710 16.2900 1,481,600
Weekend
Weekend
20.7100 20.9530 20.0000 20.0500 131,400
20.7000 21.7100 20.5500 20.5800 172,000
22.2100 22.8200 21.4000 21.6400 259,600
16 · 6-K Pre-market · 06:00 ET FORM 6-K ↗
22.1700 23.2900 22.1200 22.5900 259,600
No trading
Weekend
Weekend
20.8500 21.4000 20.2290 21.3700 149,200
20.5400 21.3600 20.2000 20.6200 249,800
18.6000 21.2800 18.6000 20.5400 667,500
19.2500 19.6500 18.7440 18.9000 161,300
19.3300 20.4600 19.2420 19.8800 121,600
Weekend
Weekend
21.4200 21.6950 19.9000 20.0400 202,300
21.0500 21.9500 20.8500 21.4600 189,900
20.3800 20.9900 19.9000 20.3600 176,500
20.9200 21.6980 20.1200 20.4200 190,300
20.7500 20.7500 19.2510 20.1300 246,900
Weekend
Weekend
21.3400 22.4900 20.3500 21.1400 719,800
21.1500 21.5690 20.3500 20.9400 153,800
15 · 6-K After-hours · 16:00 ET FORM 6-K ↗
21.5000 21.8840 20.7500 21.5300 328,800
22.8200 23.8600 21.8000 21.9800 336,800
24.1200 24.6300 23.3000 24.3500 226,700
Weekend
Weekend
23.4700 24.9000 23.3020 24.3600 181,700
23.9200 24.3700 23.0200 23.7500 226,300
24.4100 24.5000 23.1500 23.7200 281,100
23.0850 24.5000 22.5800 24.3900 209,700
23.0000 23.4170 22.0400 22.6100 207,300
Weekend
Weekend
21.9800 23.1900 21.5100 22.9000 258,200
20.6900 22.2700 20.2200 21.4700 198,700
21.6900 21.8300 20.0100 20.9700 342,000
19.6400 22.0000 18.9000 21.9800 641,400
17.4600 18.5900 17.1350 18.4500 261,600
Weekend
Weekend
17.9800 18.3900 16.8200 17.1300 187,000
16.1500 17.8000 16.0400 17.7100 306,600
17.4200 18.0000 15.4200 15.4900 383,600
17.5900 18.0600 16.6610 17.5500 324,600
17.1700 18.9900 17.1700 18.1800 318,800
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
14 · 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
13 · 424B3 Pre-market · 08:26 ET 424B3 ↗ 12 · 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
11 · 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
10 · 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
9 · 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
8 · 424B5 After-hours · 16:21 ET 424B5 ↗
24.5400 24.8240 22.9100 23.2700 215,900
Weekend
Weekend
7 · 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
6 · F-3 After-hours · 16:09 ET F-3 ↗
26.1500 27.0000 25.2310 26.6000 289,800
5 · 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
4 · 424B3 Pre-market · 08:40 ET 424B3 ↗ 3 · 424B3 Pre-market · 08:40 ET 424B3 ↗ 2 · 6-K Pre-market · 08:39 ET FORM 6-K ↗ 1 · 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

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.

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