Arq, Inc ARQ

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Arq, Inc. - Common Stock · Company · Nasdaq · Industrials / Pollution & Treatment Controls

Paper trade (simulated — no real money)

Fill: USD 1.7500 · FX 1 USD = 1.277900 SGD · about SGD 2.2363 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 6.99 → 1.75 · -75.0%
6.9904.3151.640 1,2 3 4 5 6,7 8 9,10 11,12 13 14,15 16 17 18 19 20 21,22 23 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
1.7500 1.7950 1.6800 1.7500 363,891
1.7900 1.8200 1.7600 1.7700 174,500
1.8500 1.8700 1.7600 1.8400 248,200
1.7600 1.8800 1.7400 1.8600 333,700
1.8000 1.8100 1.7100 1.7800 387,400
Weekend
Weekend
1.8700 1.8800 1.7900 1.7900 497,200
1.8900 1.8900 1.8300 1.8600 276,300
1.9600 1.9700 1.8900 1.9300 225,100
1.9700 2.0300 1.9500 1.9700 195,000
2.0300 2.0300 1.9400 1.9600 69,600
Weekend
Weekend
2.0500 2.0800 1.9100 2.0300 268,300
2.0200 2.1100 2.0000 2.1100 168,200
2.0000 2.0600 1.9800 2.0500 239,800
2.0300 2.0600 2.0100 2.0500 177,500
1.9600 2.0500 1.9200 2.0200 218,500
Weekend
Weekend
1.9100 2.0000 1.9100 1.9400 210,300
1.9800 2.0400 1.8800 1.8900 201,700
1.9200 2.0000 1.8800 1.9800 298,900
1.9200 1.9200 1.8600 1.9100 263,400
2.0300 2.0300 1.8600 1.9300 443,000
Weekend
Weekend
2.0100 2.0600 1.9800 2.0200 202,400
2.0300 2.0400 1.9900 2.0100 266,200
2.1000 2.1600 2.0100 2.0400 97,700
2.0200 2.0800 2.0100 2.0700 154,400
2.0500 2.1600 2.0100 2.0200 145,600
Weekend
Weekend
2.0900 2.1500 2.0100 2.0500 301,600
2.1100 2.1300 2.0200 2.0600 119,100
2.0700 2.1200 2.0400 2.1100 122,500
2.1600 2.1800 2.0400 2.0700 217,300
2.1700 2.2200 2.1300 2.1400 166,600
Weekend
Weekend
2.2300 2.2500 2.1700 2.2000 126,400
2.1800 2.2400 2.1600 2.2300 109,700
2.2500 2.2600 2.1500 2.1800 170,400
2.3100 2.3400 2.2100 2.2100 76,100
No trading
Weekend
Weekend
2.2500 2.3100 2.2000 2.3000 172,700
2.2000 2.2700 2.1500 2.2700 199,400
2.0500 2.2100 2.0500 2.2000 368,300
2.1000 2.1200 1.9800 2.0500 885,900
2.1400 2.1700 2.0800 2.1200 199,400
Weekend
Weekend
23 · 8-K After-hours · 16:31 ET 8-K ↗
2.2000 2.2300 2.1500 2.1600 125,200
2.2300 2.2300 2.1500 2.2000 141,000
2.1700 2.1700 2.1000 2.1500 181,900
2.2100 2.2700 2.1600 2.1700 185,300
2.3000 2.3900 2.1700 2.2100 159,600
Weekend
Weekend
2.2900 2.3300 2.2200 2.3000 139,000
2.1400 2.2600 2.1400 2.2600 208,200
2.2200 2.3700 2.1500 2.1700 401,500
2.3100 2.3100 2.2100 2.2200 147,200
2.3000 2.3500 2.2400 2.3100 117,300
Weekend
Weekend
2.2800 2.3500 2.2500 2.3400 216,600
2.2400 2.4000 2.2200 2.2800 445,100
2.2900 2.3200 2.2000 2.3000 138,800
2.3500 2.4300 2.1700 2.2700 576,900
22 · 8-K After-hours · 16:53 ET 8-K ↗ 21 · 10-Q After-hours · 16:44 ET 10-Q ↗
2.0800 2.2000 2.0400 2.0700 320,200
Weekend
Weekend
2.1200 2.1500 2.0700 2.0800 210,600
2.0900 2.1300 2.0400 2.1100 196,800
2.0800 2.1400 2.0400 2.0500 174,400
2.0300 2.1200 2.0000 2.0700 223,600
1.9500 2.0600 1.9300 2.0100 365,400
Weekend
Weekend
2.0800 2.0800 1.9500 1.9700 183,900
1.9500 2.0800 1.9300 2.0600 191,900
1.9500 1.9800 1.8900 1.9400 231,800
2.0000 2.0200 1.9400 1.9500 220,800
2.2000 2.2000 1.9800 1.9900 187,700
Weekend
Weekend
2.0200 2.0700 2.0100 2.0300 140,900
20 · 8-K After-hours · 17:09 ET 8-K ↗
2.0300 2.0700 1.9900 2.0400 192,300
2.0700 2.1500 2.0400 2.0800 220,100
2.0900 2.1500 2.0500 2.0700 382,600
2.0600 2.1300 1.9300 2.0900 424,000
Weekend
Weekend
2.1400 2.1600 2.0600 2.0600 202,600
2.2100 2.2100 2.1600 2.1800 109,400
2.2200 2.3000 2.1800 2.2000 100,500
2.2300 2.3600 2.1900 2.2200 103,100
2.3200 2.3400 2.1600 2.2200 280,500
Weekend
Weekend
2.2400 2.3600 2.2400 2.3200 262,800
2.2200 2.2500 2.2000 2.2500 116,400
2.2100 2.2600 2.1300 2.2100 199,000
2.2200 2.2600 2.1200 2.2100 464,900
2.2900 2.4200 2.2100 2.2200 220,600
Weekend
Weekend
No trading
19 · 8-K After-hours · 16:33 ET 8-K ↗
2.3500 2.4100 2.2700 2.2700 256,200
2.5500 2.6000 2.3500 2.3500 242,800
2.5200 2.6200 2.3000 2.5500 266,000
2.3500 2.5300 2.3200 2.5000 335,200
Weekend
Weekend
2.2600 2.4100 2.2600 2.3400 3,317,400
2.3800 2.4300 2.2300 2.2800 721,900
2.4600 2.5100 2.2800 2.3500 529,300
2.5400 2.6000 2.4200 2.4600 334,100
2.7900 2.8300 2.5600 2.5800 340,200
Weekend
Weekend
No trading
18 · 8-K After-hours · 16:31 ET 8-K ↗
2.7500 2.9000 2.7400 2.8400 657,900
2.8000 2.8300 2.7000 2.7300 435,300
2.7300 2.8600 2.7200 2.7700 304,700
2.7300 2.8600 2.7000 2.7200 513,900
Weekend
Weekend
2.6800 2.7800 2.6100 2.6800 271,100
17 · 8-K After-hours · 16:31 ET 8-K ↗
2.7000 2.7400 2.6200 2.6600 215,900
2.6900 2.7600 2.6600 2.6700 276,300
2.6700 2.8000 2.6200 2.6900 281,400
2.6100 2.6800 2.5800 2.6500 160,100
Weekend
Weekend
2.6600 2.6900 2.5800 2.6000 273,800
2.6000 2.7100 2.5600 2.6600 255,600
2.6800 2.7300 2.6000 2.6000 240,200
2.7500 2.7900 2.6700 2.7300 208,300
2.7700 2.8600 2.7400 2.7900 404,200
Weekend
Weekend
2.7500 2.8500 2.7200 2.7600 285,300
2.7300 2.8000 2.6500 2.7500 315,200
16 · 8-K After-hours · 16:32 ET 8-K ↗
2.4500 2.7000 2.4500 2.6800 251,700
2.4800 2.5500 2.3900 2.4900 369,300
No trading
Weekend
Weekend
2.4800 2.4800 2.4200 2.4600 196,100
2.5100 2.5100 2.4000 2.4800 196,700
2.5100 2.5600 2.4800 2.5300 152,400
2.5300 2.5600 2.5000 2.5400 167,900
2.6200 2.6200 2.5100 2.5800 147,300
Weekend
Weekend
2.6000 2.6900 2.5600 2.6200 174,500
2.5500 2.7600 2.4500 2.6300 522,300
2.7000 2.7300 2.5400 2.5500 211,400
2.7200 2.7300 2.6100 2.7100 199,500
2.6800 2.7800 2.6500 2.7300 394,000
Weekend
Weekend
2.5800 2.7700 2.4800 2.6400 384,400
2.3500 2.6900 2.3400 2.5900 668,300
15 · 8-K After-hours · 16:33 ET 8-K ↗ 14 · 10-Q After-hours · 16:30 ET 10-Q ↗
2.3700 2.3900 2.2300 2.3100 544,000
2.4600 2.5000 2.3100 2.3700 460,300
2.2700 2.4700 2.2700 2.4500 445,500
Weekend
Weekend
13 · 8-K After-hours · 16:56 ET 8-K ↗
2.2600 2.3300 2.2600 2.2900 245,200
2.2000 2.3200 2.1500 2.2700 366,200
2.2400 2.2700 2.1900 2.2300 150,700
12 · DEFA14A After-hours · 16:37 ET DEFA14A ↗ 11 · DEF 14A After-hours · 16:34 ET DEF 14A ↗
2.2700 2.3300 2.2200 2.2700 209,400
2.2800 2.3100 2.2700 2.2800 202,100
Weekend
Weekend
2.2800 2.3500 2.2600 2.2900 205,600
2.2100 2.3100 2.2000 2.3000 262,200
2.2200 2.2600 2.2100 2.2300 260,300
2.2400 2.2700 2.1900 2.2200 238,700
2.2100 2.2700 2.1800 2.2400 209,800
Weekend
Weekend
10 · PRE 14A After-hours · 16:32 ET PRE 14A ↗ 9 · 8-K After-hours · 16:31 ET 8-K ↗
2.2800 2.3200 2.2100 2.2300 457,900
2.3700 2.3700 2.2600 2.2700 414,900
2.3200 2.3800 2.2500 2.3600 377,800
2.1300 2.2600 2.1100 2.2400 652,100
2.1400 2.1800 2.1000 2.1200 432,300
Weekend
Weekend
2.1200 2.2000 2.1100 2.1700 456,500
2.2800 2.3200 2.1000 2.1200 669,800
2.5000 2.5000 2.2900 2.2900 363,400
2.4300 2.4800 2.3400 2.3900 309,300
2.4700 2.5400 2.4600 2.4700 366,400
Weekend
Weekend
No trading
2.3200 2.4900 2.2600 2.4700 1,017,100
2.5800 2.5900 2.3200 2.3600 621,900
8 · 8-K Pre-market · 08:00 ET 8-K ↗
2.4900 2.6000 2.4300 2.5600 497,100
2.5000 2.5600 2.4200 2.4900 418,100
Weekend
Weekend
2.4500 2.6100 2.3700 2.5400 555,100
2.4600 2.7200 2.4600 2.5000 983,000
2.4300 2.5800 2.4000 2.5000 1,441,300
2.2500 2.3800 2.2400 2.3300 703,800
1.9800 2.3000 1.9700 2.2700 1,632,800
Weekend
Weekend
2.0900 2.0900 1.9800 1.9900 731,100
1.8800 2.0900 1.8200 2.0700 1,057,700
1.9600 2.0300 1.8800 1.9000 1,386,900
1.9500 1.9900 1.8700 1.8900 867,400
1.9500 1.9600 1.8600 1.8800 986,600
Weekend
Weekend
2.0500 2.0500 1.9000 1.9200 1,365,900
1.7400 2.1000 1.7200 2.0400 3,095,400
1.6500 1.7800 1.6200 1.7800 4,510,100
2.0100 2.0300 1.5400 1.6400 15,252,400
7 · 10-K Next filing day · accepted 09 Mar, 19:22 ET 10-K ↗ 6 · 8-K Next filing day · accepted 09 Mar, 19:10 ET 8-K ↗
3.1500 3.2400 3.0900 3.2000 693,900
Weekend
Weekend
3.3300 3.3400 3.1700 3.2100 417,200
3.4600 3.5000 3.3300 3.4000 195,600
3.5200 3.6300 3.4400 3.5000 298,000
5 · 8-K After-hours · 17:06 ET 8-K ↗
3.4000 3.5600 3.3100 3.4800 246,800
3.4400 3.5700 3.4300 3.5000 208,900
Weekend
Weekend
3.5600 3.6900 3.4300 3.5100 353,100
3.5500 3.6500 3.4200 3.6200 282,700
3.4600 3.6200 3.3800 3.5700 277,500
3.3600 3.4500 3.3600 3.4100 126,100
3.4600 3.4600 3.2900 3.3600 219,500
Weekend
Weekend
3.5000 3.5300 3.4000 3.4600 154,600
3.4300 3.5300 3.3800 3.5300 284,000
3.4100 3.5000 3.3600 3.4600 194,400
3.5800 3.5800 3.3600 3.4100 321,200
No trading
Weekend
Weekend
3.6200 3.6400 3.4500 3.5900 410,900
3.8000 3.8300 3.5100 3.6200 351,200
3.8900 3.9100 3.7700 3.8000 206,100
3.7600 3.9200 3.6900 3.8500 304,400
3.5400 3.8100 3.5400 3.7600 393,600
Weekend
Weekend
3.5900 3.6700 3.5100 3.5200 308,000
3.7200 3.7700 3.4900 3.5300 270,800
3.5600 3.8500 3.5100 3.7500 432,600
3.6300 3.7100 3.4700 3.5400 238,100
3.5500 3.6500 3.4900 3.6100 310,600
Weekend
Weekend
3.6200 3.6500 3.5000 3.5600 327,000
4 · 8-K After-hours · 16:34 ET 8-K ↗
3.7400 3.7500 3.5600 3.6500 186,200
3.8100 3.9400 3.7100 3.7400 171,200
3.8400 3.8600 3.7000 3.7900 277,100
3.8000 4.0200 3.7800 3.8100 304,100
Weekend
Weekend
3.7200 3.8300 3.7000 3.7900 230,000
3.6800 3.8000 3.6800 3.7300 347,900
3.5500 3.6700 3.5200 3.6700 375,600
3.5300 3.6600 3.5000 3.5500 266,700
No trading
Weekend
Weekend
3.6400 3.7200 3.5800 3.6300 404,300
3.6200 3.7300 3.5900 3.6300 243,500
3.6600 3.7000 3.6000 3.6200 259,100
3.8300 3.8700 3.6200 3.6600 268,000
3.6000 3.9900 3.5800 3.8200 434,700
Weekend
Weekend
3.6800 3.7500 3.5700 3.6000 363,200
3.5200 3.7600 3.5200 3.6600 263,800
3.5400 3.6200 3.5000 3.5600 230,200
3.5500 3.5500 3.4600 3.5400 249,000
3.3800 3.6000 3.3600 3.5400 423,600
Weekend
Weekend
3.3000 3.4100 3.2600 3.3300 390,200
No trading
3.2300 3.2900 3.1800 3.2700 364,100
3.3000 3.4200 3.2200 3.2300 437,600
3.3700 3.4200 3.2900 3.3000 384,400
Weekend
Weekend
3.5000 3.5000 3.2700 3.4100 278,300
No trading
3.2800 3.4300 3.2600 3.4100 168,000
3.2300 3.3400 3.2100 3.2800 443,900
3.2500 3.3800 3.2400 3.2400 574,200
Weekend
Weekend
3.3100 3.3200 3.2000 3.2000 545,300
3.2800 3.3400 3.2500 3.3100 451,000
3.3000 3.3700 3.1900 3.2200 461,100
3.3200 3.4100 3.2300 3.2900 843,000
3.3700 3.3800 3.2700 3.3000 489,300
Weekend
Weekend
3.6000 3.6100 3.3500 3.3500 736,600
3 · 8-K After-hours · 17:16 ET 8-K ↗
3.6500 3.7300 3.6000 3.6000 415,900
3.6400 3.7000 3.5700 3.6600 415,400
3.6700 3.7400 3.6500 3.6600 247,500
3.8100 3.8100 3.6200 3.6800 250,100
Weekend
Weekend
3.8300 3.8900 3.7600 3.7700 189,400
3.9000 3.9200 3.7100 3.8400 452,900
3.8200 3.9300 3.7800 3.9100 345,700
3.6800 3.8600 3.6700 3.8200 534,000
3.6500 3.7800 3.6400 3.6800 421,100
Weekend
Weekend
3.7400 3.7400 3.6800 3.7200 133,600
No trading
3.6200 3.7400 3.5900 3.6900 337,400
3.5200 3.6200 3.4800 3.6100 345,400
3.5500 3.5800 3.4200 3.5100 528,100
Weekend
Weekend
3.2700 3.5300 3.2700 3.5000 634,200
3.5600 3.6300 3.2700 3.3000 518,800
3.4900 3.5500 3.4600 3.5000 532,900
3.5100 3.6000 3.4500 3.5100 672,100
3.5300 3.6500 3.4600 3.5100 722,800
Weekend
Weekend
3.5500 3.6400 3.5000 3.5300 547,500
3.7700 3.9500 3.5400 3.5700 945,900
3.7900 4.0300 3.7000 3.7000 862,800
3.6500 3.7000 3.4600 3.4700 676,900
3.8900 4.0300 3.6600 3.6600 712,300
Weekend
Weekend
4.0400 4.0800 3.6500 3.8500 1,054,100
4.8100 4.8800 4.0800 4.1000 2,103,200
2 · 8-K After-hours · 16:36 ET 8-K ↗ 1 · 10-Q After-hours · 16:32 ET 10-Q ↗
6.4100 6.4900 6.2100 6.3500 235,700
6.5200 6.6000 6.3900 6.4100 134,200
6.6900 6.7300 6.5100 6.6000 143,800
Weekend
Weekend
6.6600 6.8100 6.6000 6.6400 96,400
6.5700 6.7500 6.5100 6.6800 125,400
6.8700 6.9500 6.6300 6.6600 130,400
6.9500 7.0000 6.7800 6.8700 151,200
7.0300 7.0300 6.8600 6.9400 104,000
Weekend
Weekend
6.9900 7.0700 6.8800 6.9900 143,000

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 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:31 ET Summarise
22 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:53 ET Summarise
21 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:44 ET Summarise
20 8-K 8-K (opens SEC filing in a new tab) After-hours · 17:09 ET Summarise
19 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:33 ET Summarise
18 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:31 ET Summarise
17 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:31 ET Summarise
16 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:32 ET Summarise
15 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:33 ET Summarise
14 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:30 ET Summarise
13 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:56 ET Summarise
12 DEFA14A DEFA14A (opens SEC filing in a new tab) After-hours · 16:37 ET Summarise
11 DEF 14A DEF 14A (opens SEC filing in a new tab) After-hours · 16:34 ET Summarise
10 PRE 14A PRE 14A (opens SEC filing in a new tab) After-hours · 16:32 ET Summarise
9 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:31 ET Summarise
8 8-K 8-K (opens SEC filing in a new tab) Pre-market · 08:00 ET Summarise
7 10-K 10-K (opens SEC filing in a new tab) Next filing day · accepted 09 Mar, 19:22 ET Summarise
6 8-K 8-K (opens SEC filing in a new tab) Next filing day · accepted 09 Mar, 19:10 ET Summarise
5 8-K 8-K (opens SEC filing in a new tab) After-hours · 17:06 ET Summarise
4 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:34 ET Summarise
3 8-K 8-K (opens SEC filing in a new tab) After-hours · 17:16 ET Summarise
2 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:36 ET Summarise
1 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:32 ET Summarise