Atara Biotherapeutics, Inc ATRA

Open calendar →

Atara Biotherapeutics, Inc. - Common Stock · Company · Nasdaq · Healthcare / Biotechnology

Paper trade (simulated — no real money)

Fill: USD 8.5900 · FX 1 USD = 1.278120 SGD · about SGD 10.9791 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 15.59 → 8.59 · -44.9%
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 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
9.3700 9.3700 8.5500 8.5900 24,300
9.2300 9.6500 8.9710 9.4300 23,000
9.2500 9.4300 9.1700 9.3500 26,500
8.8900 9.2900 8.8800 9.1600 14,800
9.0300 9.3500 8.9600 8.9600 12,500
Weekend
Weekend
9.6700 9.9050 9.1800 9.1800 19,500
9.3500 9.7800 9.1850 9.6500 24,300
9.2900 9.9900 9.2000 9.5600 39,600
9.2500 9.5400 8.8000 9.3050 32,300
9.4200 9.5800 8.9900 9.3800 26,800
Weekend
Weekend
9.3300 9.5600 9.3300 9.4800 22,100
9.4200 9.4200 8.8200 9.2300 28,900
9.6200 9.7500 9.3700 9.3700 11,400
9.4100 9.7900 9.0500 9.7500 47,600
9.5900 9.6300 8.9500 9.4000 39,300
Weekend
Weekend
8.4600 9.6750 8.2500 9.4800 85,700
8.7300 9.2000 8.2300 8.4600 90,900
8.0800 8.7100 7.8300 8.5000 29,300
8.3300 8.8210 7.8900 8.0500 56,400
8.6900 8.7050 8.3360 8.3700 23,500
Weekend
Weekend
8.6000 8.9900 8.5350 8.8100 31,200
8.6000 8.8600 8.3300 8.5400 20,800
8.9200 8.9500 8.4000 8.5600 40,500
9.3000 9.6000 8.9300 8.9300 27,300
9.6900 9.9200 9.3000 9.3800 29,700
Weekend
Weekend
9.7300 10.1900 9.6000 9.6900 37,800
10.2800 10.2800 9.4100 9.7100 26,400
9.5000 10.3700 9.0700 10.1100 116,700
9.2100 9.8800 8.9200 9.4400 56,100
9.0900 9.7100 9.0700 9.2500 50,800
Weekend
Weekend
10.0000 10.0000 9.3800 9.3800 16,000
9.9400 9.9400 9.5200 9.8900 23,200
10.2700 10.4300 9.7600 9.9100 68,500
10.6000 11.3300 10.2300 10.2300 106,900
No trading
Weekend
Weekend
9.4500 9.9500 9.2500 9.7600 132,700
9.4900 9.5300 9.0000 9.5300 25,300
9.0800 9.4800 9.0800 9.4400 20,900
8.9600 9.1800 8.8000 9.0200 51,900
9.0900 9.2900 8.8300 8.9000 30,200
Weekend
Weekend
9.1800 9.2100 8.9000 9.2000 15,300
9.3800 9.6000 9.1650 9.2500 26,900
9.6500 9.8400 9.3800 9.3800 63,700
9.5700 10.0200 9.5380 9.8400 48,500
9.5700 9.6600 9.3100 9.4600 24,000
Weekend
Weekend
9.4600 9.8900 9.1500 9.7000 27,100
9.6000 9.7400 9.1400 9.3800 28,000
8.8500 9.7400 8.2760 9.6000 79,100
8.3400 8.9000 8.3400 8.7200 29,500
8.0000 8.4800 7.8100 8.3600 66,000
Weekend
Weekend
8.5100 8.5100 7.9900 8.0900 66,200
8.3400 9.2400 7.7300 8.5100 126,500
23 · 10-Q After-hours · 16:15 ET 10-Q ↗ 22 · 8-K After-hours · 16:10 ET 8-K ↗
8.8800 9.4300 8.7000 9.2250 90,000
8.6200 9.0400 8.3590 8.9400 29,200
8.4200 8.8000 8.0900 8.6100 45,300
Weekend
Weekend
8.3000 8.4850 8.2020 8.4500 23,200
8.6000 8.6450 8.0900 8.2500 22,900
8.6000 8.9800 8.3800 8.5400 32,500
8.5500 9.1100 8.5500 8.7700 42,300
8.4200 8.6600 8.2550 8.5500 53,200
Weekend
Weekend
8.1700 8.6700 7.8600 8.3800 34,500
8.1800 8.3200 7.8600 8.1700 96,000
7.7400 8.2500 7.5700 8.0600 39,800
7.7600 7.9100 7.3900 7.8100 85,400
8.0600 8.3310 7.6500 7.7100 62,700
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
21 · 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
20 · 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
19 · 424B5 After-hours · 16:20 ET 424B5 ↗ 18 · 10-Q After-hours · 16:15 ET 10-Q ↗ 17 · 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
16 · 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
15 · 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
14 · DEF 14A After-hours · 16:15 ET DEF 14A ↗ 13 · 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
12 · 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
11 · S-3 After-hours · 16:17 ET S-3 ↗
5.7400 5.7400 5.0600 5.2300 319,700
10 · 424B5 After-hours · 16:20 ET 424B5 ↗ 9 · 10-K After-hours · 16:15 ET 10-K ↗ 8 · 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
7 · 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
6 · 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
5 · 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
4 · 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
3 · 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
2 · 10-Q Pre-market · 09:10 ET 10-Q ↗ 1 · 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

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