Atara Biotherapeutics, Inc ATRA

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Atara Biotherapeutics, Inc. - Common Stock · Company · Nasdaq

Paper trade (simulated — no real money)

Fill: USD 7.9000 · FX 1 USD = 1.288650 SGD · about SGD 10.1803 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 11.81 → 7.90 · -33.1%
18.09011.1354.180 1,2 3 4 5,6 7 8 9 10 11 12,13,14 15 16 17,18 19 20 21,22,23 24 25 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
8.1900 8.3800 7.8400 7.9000 75,200
7.9200 8.3600 7.8100 8.1700 46,500
8.6100 8.6100 8.0180 8.1250 28,900
8.3700 8.6800 8.0700 8.6300 48,400
8.2900 8.8300 8.0930 8.2900 59,200
Weekend
Weekend
8.2400 8.8200 8.1000 8.3900 81,300
8.6800 8.8300 8.3800 8.7200 40,100
8.0400 8.5900 8.0400 8.5500 73,400
8.5900 8.8100 7.9100 8.0400 202,800
9.6100 9.6100 8.5600 8.6700 136,300
Weekend
Weekend
10.0600 10.0600 9.3550 9.7600 66,900
9.5900 10.1550 9.4800 9.9450 49,400
10.0400 10.3750 9.5000 9.6500 206,800
10.9600 10.9900 10.2600 10.2600 49,300
11.6700 11.8600 10.7450 10.8800 80,400
Weekend
Weekend
No trading
11.5000 12.0000 11.4100 11.6500 31,700
11.4700 11.8600 11.1100 11.3700 35,500
11.1100 11.6300 11.0100 11.4800 106,700
10.6000 11.1800 10.4700 11.1700 59,800
Weekend
Weekend
25 · 8-K After-hours · 16:15 ET 8-K ↗
10.2000 10.7100 10.1500 10.5100 45,300
10.5800 11.2100 10.1300 10.2200 67,600
11.1200 11.1200 10.4610 10.5500 49,600
10.4300 11.5500 10.4300 11.1600 105,100
9.9300 10.7050 9.6600 10.6100 95,200
Weekend
Weekend
No trading
9.8900 10.3200 9.5700 10.0700 144,900
9.7300 10.0950 9.4100 9.6700 122,200
9.9200 10.0650 9.2110 9.6200 126,100
10.5000 10.9200 9.8500 9.9600 80,700
Weekend
Weekend
24 · 8-K After-hours · 16:05 ET CURRENT REPORT ↗
10.1400 10.9900 10.1400 10.4100 95,600
9.8900 10.4900 9.8900 10.4600 42,800
9.7000 10.2300 9.4900 9.8600 56,400
9.5800 10.1500 9.4200 9.7700 65,900
10.1500 10.1500 9.5200 9.5800 113,200
Weekend
Weekend
10.1800 10.1800 9.8270 9.9200 69,000
9.5400 10.4500 9.5400 10.2700 94,400
10.0300 10.2320 9.3500 9.6300 104,200
10.2800 10.4200 9.8400 9.9000 62,700
10.4800 10.6540 10.0010 10.2800 90,100
Weekend
Weekend
11.2800 11.3330 10.3300 10.5100 96,400
10.5400 11.3500 10.1830 11.2600 146,700
9.6000 10.7000 9.5600 10.5400 168,900
9.6400 10.0800 9.1500 9.6100 182,300
No trading
Weekend
Weekend
9.4200 9.9900 8.8800 9.8000 122,600
9.2100 9.4990 9.0500 9.3400 52,600
9.6100 9.6300 9.0000 9.4500 80,400
9.2500 9.6000 8.5400 9.4100 286,600
9.1500 9.5500 8.7600 9.1500 382,600
Weekend
Weekend
9.7100 9.8050 8.6500 9.5800 226,200
10.3800 10.8000 9.3450 9.5900 302,500
9.2200 10.5800 9.0830 10.4800 746,700
23 · 424B5 After-hours · 16:20 ET 424B5 ↗ 22 · 10-Q After-hours · 16:15 ET 10-Q ↗ 21 · 8-K After-hours · 16:10 ET 8-K ↗
9.2100 10.6600 9.0000 9.8100 1,084,500
8.8300 9.0800 7.9000 8.7800 942,900
Weekend
Weekend
9.6500 9.9300 7.8500 8.3400 3,003,000
7.8500 12.4500 6.8000 9.9300 76,987,200
20 · 8-K Pre-market · 08:10 ET 8-K ↗
4.7700 5.2600 4.7200 5.1500 185,100
4.8700 4.8800 4.6800 4.7600 46,700
4.8600 5.0150 4.6300 4.8800 136,900
Weekend
Weekend
19 · 8-K After-hours · 16:05 ET 8-K ↗
4.7800 4.9000 4.7100 4.9000 37,000
4.7500 5.1600 4.7500 4.7700 62,900
4.7100 4.8440 4.5200 4.6000 60,900
4.9600 4.9700 4.7300 4.7300 33,000
4.9400 5.2100 4.7500 4.9900 52,300
Weekend
Weekend
18 · DEF 14A After-hours · 16:15 ET DEF 14A ↗ 17 · DEFA14A After-hours · 16:15 ET DEFA14A ↗
4.9400 5.1120 4.8010 5.0100 26,600
5.1600 5.2200 4.8900 4.9000 34,600
4.9900 5.3000 4.9900 5.1800 61,400
5.0000 5.2600 4.9100 4.9900 34,300
5.2500 5.2700 4.9200 4.9900 82,200
Weekend
Weekend
5.2700 5.5470 5.2550 5.2700 76,200
5.2200 5.4300 5.1800 5.2400 34,800
5.1400 5.3800 5.1100 5.2400 53,500
4.8900 5.3200 4.7700 5.1500 87,500
4.6500 5.1200 4.5600 4.8900 91,500
Weekend
Weekend
4.8400 4.9960 4.5150 4.6500 87,100
5.0300 5.0400 4.4400 4.8300 131,400
4.9100 5.2000 4.7250 5.0100 121,600
4.8600 4.9650 4.6010 4.7100 32,200
5.0100 5.2200 4.8000 4.8700 53,300
Weekend
Weekend
No trading
5.0000 5.2600 4.8700 4.9900 47,000
4.8600 5.2500 4.7750 5.1700 79,800
4.4000 4.8600 4.4000 4.7300 63,500
4.5900 4.6900 4.3000 4.3200 77,100
Weekend
Weekend
4.7100 4.9900 4.5850 4.5900 51,300
4.8800 5.0690 4.7000 4.7100 67,000
16 · 424B3 After-hours · 17:07 ET 424B3 ↗
5.0700 5.3500 4.9500 4.9600 66,100
4.8300 5.2500 4.7000 4.9900 99,300
5.0000 5.0300 4.7570 4.8450 67,900
Weekend
Weekend
5.1000 5.2600 4.8200 4.9100 62,800
4.9100 5.2400 4.8500 5.1200 83,900
5.0600 5.2130 4.8200 5.0000 135,700
15 · S-3 After-hours · 16:17 ET S-3 ↗
5.7400 5.7400 5.0600 5.2300 319,700
14 · 424B5 After-hours · 16:20 ET 424B5 ↗ 13 · 10-K After-hours · 16:15 ET 10-K ↗ 12 · 8-K After-hours · 16:10 ET 8-K ↗
6.4100 6.4500 5.8000 5.8700 228,100
Weekend
Weekend
6.8000 7.0000 6.2100 6.5000 171,900
6.4600 7.0700 6.0500 6.9000 509,800
11 · 8-K Pre-market · 08:10 ET 8-K ↗
6.1800 6.5000 5.6000 6.2300 379,000
6.4500 7.0500 6.0500 6.2900 644,200
5.7100 7.3000 5.5000 6.6800 3,222,700
Weekend
Weekend
4.8500 5.3650 4.7000 5.1700 3,201,200
5.3300 5.3300 4.9430 5.0000 75,800
5.3900 5.5000 5.1300 5.3900 68,000
4.8800 5.6500 4.8200 5.4200 388,000
10 · 8-K Pre-market · 08:30 ET 8-K ↗
5.2100 5.2300 4.9100 4.9100 130,000
Weekend
Weekend
5.1200 5.4900 4.8000 5.4200 130,800
5.0100 5.8900 4.6800 5.2600 510,900
4.1900 5.5600 4.1700 5.0600 570,500
4.1500 4.3300 4.0300 4.2100 41,200
4.1200 4.2000 3.9200 4.2000 145,900
9 · 8-K Pre-market · 08:29 ET 8-K ↗
Weekend
Weekend
4.2600 4.3000 4.1300 4.1800 55,500
4.3700 4.3700 4.1300 4.2400 100,600
4.4700 4.6400 4.3400 4.4300 103,700
4.4600 4.5990 4.3800 4.4900 54,000
No trading
Weekend
Weekend
4.4500 4.6800 4.4500 4.4500 29,900
4.6000 4.7000 4.3650 4.4500 103,700
4.8400 4.8550 4.5100 4.5900 124,600
4.9600 5.1100 4.8000 4.8300 50,200
4.8600 5.0600 4.7000 4.9800 51,400
Weekend
Weekend
4.5800 4.9200 4.5800 4.8800 100,000
4.6200 4.9660 4.5000 4.5100 133,100
5.0700 5.1800 4.7600 4.8600 102,000
5.0300 5.2500 5.0000 5.0400 89,700
5.1100 5.2700 5.0000 5.0400 93,700
Weekend
Weekend
5.4500 5.5900 4.9100 5.2000 202,300
5.5300 5.6910 5.4000 5.5100 176,200
5.6000 5.7100 5.3500 5.5000 192,500
5.2000 5.6800 5.2000 5.5600 292,800
5.2200 5.4200 5.0700 5.2900 217,200
Weekend
Weekend
4.9800 5.3480 4.9000 5.2200 363,700
4.5800 5.1500 4.4600 5.0000 569,800
4.3400 4.6900 4.2000 4.6000 418,500
4.5000 4.7900 4.2500 4.3200 597,800
No trading
Weekend
Weekend
4.7200 5.0030 4.5200 4.5400 509,400
4.5200 5.1900 4.4000 4.6200 1,098,300
4.5000 4.8200 4.3600 4.4700 871,100
5.9500 5.9600 4.2520 4.3700 2,501,100
8 · 8-K After-hours · 16:00 ET 8-K ↗
5.6200 6.5100 5.5800 5.8800 4,629,500
Weekend
Weekend
17.6800 17.9800 13.0800 13.6700 852,300
15.1000 17.9700 14.9000 17.4400 418,000
15.1600 15.5300 14.7200 14.9400 256,200
16.9700 17.6490 14.2700 14.5700 228,700
18.4700 19.1450 16.6050 16.8600 216,100
Weekend
Weekend
7 · 8-K After-hours · 16:01 ET 8-K ↗
18.3500 19.0780 17.6350 17.7700 111,200
No trading
17.9500 18.3390 17.9400 18.0900 66,500
17.9200 18.2500 17.5400 17.8800 48,000
17.1500 17.9900 16.8000 17.9900 72,800
Weekend
Weekend
17.6100 18.3010 16.5900 17.2700 71,100
No trading
17.7000 18.0400 16.9100 17.5900 67,900
17.9700 18.7500 17.3600 17.5000 66,800
16.9000 18.9500 16.9000 17.8600 105,600
Weekend
Weekend
17.7000 18.0900 16.5100 17.1700 79,600
17.2200 17.8000 17.1200 17.2300 36,400
17.7000 18.1450 16.7000 17.1800 59,200
17.7900 18.0000 17.1200 17.5800 62,200
18.0000 18.2500 17.6600 17.9500 69,200
Weekend
Weekend
17.8200 18.1660 16.6500 17.9950 103,300
16.5000 18.3700 16.4000 17.8200 102,000
15.6500 17.2500 15.3580 16.8300 132,700
14.9700 15.9460 14.3730 15.6900 62,300
14.5200 15.0900 14.4300 15.0800 52,300
Weekend
Weekend
14.2600 14.7500 14.0800 14.3300 68,900
12.5500 14.2500 12.5500 14.2000 127,300
12.3500 12.8600 12.0500 12.5500 63,000
13.6100 13.6800 12.2200 12.2200 53,300
14.7700 14.9620 13.5350 13.5400 87,100
Weekend
Weekend
15.0100 15.2800 14.5300 15.1000 18,000
No trading
14.6100 15.2800 14.6100 14.8600 63,000
14.2000 14.7100 14.0100 14.5700 58,200
13.6900 14.3490 13.4300 14.0300 74,000
Weekend
Weekend
13.3400 14.1910 13.2600 13.6800 47,500
13.9400 15.1200 12.9300 13.2200 91,100
13.4400 13.9600 13.3500 13.7400 39,500
13.0800 13.7500 12.7550 13.4600 45,500
13.6500 13.7300 12.7800 13.1000 99,300
Weekend
Weekend
13.1900 14.2800 13.1300 13.7600 43,900
12.4500 13.5000 12.4100 13.3900 51,900
12.3600 12.5000 11.2100 12.4700 81,000
6 · 10-Q Pre-market · 09:10 ET 10-Q ↗ 5 · 8-K Pre-market · 09:05 ET 8-K ↗
12.2400 12.8900 12.0450 12.5600 61,200
11.9700 12.7500 11.7600 12.3000 27,300
Weekend
Weekend
10.8600 12.0400 10.5300 11.8100 64,300
10.7600 12.4700 10.5600 11.8200 113,100
12.4000 12.6100 10.5000 10.7500 158,700
13.6200 13.7100 12.1300 12.2900 103,700
14.9000 15.3000 13.7000 13.8500 49,900
Weekend
Weekend
13.9900 14.8900 13.9900 14.8500 51,400
14.0600 14.5000 13.3000 14.0450 45,700
15.4300 15.4300 13.8700 14.0600 37,700
15.5800 15.7400 15.0500 15.2100 21,800
14.7500 15.5900 14.6300 15.5900 51,200
Weekend
Weekend
14.3800 14.7000 14.0440 14.4900 39,400
14.6600 15.3900 14.0500 14.1200 44,100
15.7100 15.8350 14.6100 14.6300 45,100
16.0400 16.1500 15.0200 15.7900 55,600
15.0800 16.0900 14.9500 16.0400 76,600
Weekend
Weekend
15.0900 15.4200 14.5800 14.8100 33,300
15.4200 16.2800 14.9200 15.2450 47,100
15.0900 15.4500 14.6100 15.2800 34,200
14.8500 14.8500 14.0000 14.6100 51,000
14.6200 15.3500 14.3000 15.0400 66,400
Weekend
Weekend
16.2800 16.2800 14.0260 14.3250 91,600
16.0000 16.7200 15.8500 16.0800 80,300
15.7600 15.9700 14.8500 15.8500 69,700
14.0000 15.9000 13.8930 15.6300 115,200
4 · 8-K Next filing day · accepted 06 Oct, 17:32 ET 8-K ↗
14.4100 14.4100 13.9200 13.9800 44,000
Weekend
Weekend
14.5800 14.8500 14.0900 14.4100 34,900
14.5900 14.6400 14.0200 14.4800 35,300
14.2900 14.7800 14.0000 14.4500 54,000
13.8100 14.5700 13.1200 14.3300 89,600
13.5500 13.9500 13.5000 13.8100 44,900
Weekend
Weekend
13.8500 14.0250 12.9470 13.7400 36,800
14.1100 14.2400 13.4800 13.8300 34,700
13.0000 14.9050 12.8200 14.2600 198,400
12.3100 13.0000 12.0000 12.9700 57,900
12.0000 12.3000 11.6700 12.3000 54,100
Weekend
Weekend
12.0000 12.2700 11.6600 12.0500 77,500
11.8200 12.0700 11.3340 12.0700 35,300
11.5600 11.8300 11.5100 11.5900 13,900
11.9500 12.0000 11.5100 11.5100 19,500
12.3900 12.5000 11.7700 11.9400 31,500
Weekend
Weekend
12.1300 12.2500 11.8000 12.1200 37,500
11.8000 12.2200 11.7500 12.1600 29,000
11.9400 12.0940 11.7000 11.7800 12,000
12.0000 12.1800 11.8000 11.9450 40,700
12.7500 12.7500 11.8000 12.1800 103,900
Weekend
Weekend
12.7800 13.2000 12.4100 12.9100 65,700
12.6400 12.8000 12.3750 12.8000 21,600
3 · 8-K Next filing day · accepted 03 Sep, 18:05 ET 8-K ↗
12.4200 12.7500 12.2300 12.6300 53,900
11.9700 12.6000 11.8110 12.3400 68,500
No trading
Weekend
Weekend
12.4400 12.4400 11.7020 12.0500 36,400
12.4000 12.7600 12.1550 12.3600 50,900
12.5900 12.7500 11.8600 12.3500 34,100
12.5000 13.0800 12.1900 12.6400 80,100
12.3700 12.5550 12.0200 12.2400 57,200
Weekend
Weekend
11.7200 12.4000 11.6200 12.3400 90,700
11.6300 11.9200 11.2800 11.4900 31,100
11.8700 12.0910 11.2650 11.7600 64,500
11.5300 12.0600 11.2400 11.4800 35,200
12.2100 12.5000 11.2000 11.4800 78,100
Weekend
Weekend
11.7200 12.4900 11.5200 12.2900 149,600
12.0000 12.1100 11.5350 11.7200 41,400
11.6700 12.2500 11.6200 12.1300 57,700
11.0100 12.3070 10.8700 11.5400 57,500
2 · 10-Q After-hours · 16:10 ET 10-Q ↗ 1 · 8-K After-hours · 16:05 ET 8-K ↗
10.8600 11.4450 10.3200 10.3200 41,700
Weekend
Weekend
11.0300 11.6600 10.3900 10.9550 25,000
11.3900 11.7900 10.5300 10.9600 23,400
11.3100 11.7490 10.8580 11.3850 24,600
11.7510 11.8430 11.1530 11.2200 19,900
11.4300 11.6000 11.2000 11.3200 14,000
Weekend
Weekend
11.4000 11.7300 10.9200 11.5500 39,800
12.1100 12.3170 11.5000 11.5200 41,100
11.9100 12.8480 11.8100 12.1100 90,400
11.7500 12.0000 11.3600 11.7300 47,600
11.5800 11.9000 10.6900 11.8100 42,300
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.

25 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:15 ET Summarise
24 8-K CURRENT REPORT (opens SEC filing in a new tab) After-hours · 16:05 ET Summarise
23 424B5 424B5 (opens SEC filing in a new tab) After-hours · 16:20 ET Summarise
22 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:15 ET Summarise
21 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:10 ET Summarise
20 8-K 8-K (opens SEC filing in a new tab) Pre-market · 08:10 ET Summarise
19 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:05 ET Summarise
18 DEF 14A DEF 14A (opens SEC filing in a new tab) After-hours · 16:15 ET Summarise
17 DEFA14A DEFA14A (opens SEC filing in a new tab) After-hours · 16:15 ET Summarise
16 424B3 424B3 (opens SEC filing in a new tab) After-hours · 17:07 ET Summarise
15 S-3 S-3 (opens SEC filing in a new tab) After-hours · 16:17 ET Summarise
14 424B5 424B5 (opens SEC filing in a new tab) After-hours · 16:20 ET Summarise
13 10-K 10-K (opens SEC filing in a new tab) After-hours · 16:15 ET Summarise
12 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:10 ET Summarise
11 8-K 8-K (opens SEC filing in a new tab) Pre-market · 08:10 ET Summarise
10 8-K 8-K (opens SEC filing in a new tab) Pre-market · 08:30 ET Summarise
9 8-K 8-K (opens SEC filing in a new tab) Pre-market · 08:29 ET Summarise
8 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:00 ET Summarise
7 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:01 ET Summarise
6 10-Q 10-Q (opens SEC filing in a new tab) Pre-market · 09:10 ET Summarise
5 8-K 8-K (opens SEC filing in a new tab) Pre-market · 09:05 ET Summarise
4 8-K 8-K (opens SEC filing in a new tab) Next filing day · accepted 06 Oct, 17:32 ET Summarise
3 8-K 8-K (opens SEC filing in a new tab) Next filing day · accepted 03 Sep, 18:05 ET Summarise
2 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:10 ET Summarise
1 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:05 ET Summarise