Gossamer Bio, Inc GOSS

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Gossamer Bio, Inc. - Common Stock · Company · Nasdaq · Healthcare / Biotechnology

Paper trade (simulated — no real money)

Fill: USD 9.6050 · FX 1 USD = 1.277900 SGD · about SGD 12.2742 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 2.48 → 9.61 · 287.3%
14.4007.2680.136 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 26,27 28 29 30,31 32 33 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
9.4000 9.7200 9.0000 9.6050 144,773
9.7300 9.9650 9.3400 9.4600 190,500
9.5000 10.3900 9.5000 9.7900 218,900
8.4100 9.6250 8.2900 9.5800 213,600
8.8000 8.8850 8.3110 8.4300 179,500
Weekend
Weekend
8.8800 8.9950 8.5100 8.7700 171,100
8.8600 9.1800 8.7300 8.8900 197,700
9.5900 9.6410 8.7700 8.9050 360,800
9.8300 10.0340 9.2600 9.7600 478,000
9.5400 9.5400 8.9900 9.2800 155,000
Weekend
Weekend
9.9300 10.1000 9.2000 9.3100 289,900
10.0200 10.2760 9.6570 9.8800 196,800
10.3800 10.6600 9.7740 10.1800 280,600
10.7700 10.9300 10.5000 10.7800 196,600
10.7000 10.9860 10.0000 10.6500 390,900
Weekend
Weekend
11.1900 11.1900 10.1870 10.7100 235,000
11.6300 12.1400 10.8000 10.9300 351,800
11.5300 12.4600 11.1600 11.8500 381,900
11.6800 11.8450 11.2100 11.5800 384,000
33 · 8-K After-hours · 20:01 ET 8-K ↗
10.4600 11.8500 10.3300 11.5200 516,400
Weekend
Weekend
10.9300 11.0100 10.2230 10.9400 426,600
10.7600 11.6790 10.7500 10.9300 236,100
32 · 8-K After-hours · 16:05 ET 8-K ↗
11.6900 11.9700 10.0300 10.9900 453,800
11.4800 12.3100 11.3500 11.6900 195,600
11.6000 11.9400 10.9100 11.2800 258,800
Weekend
Weekend
12.0000 12.4900 10.6700 10.7300 530,100
11.7800 12.4500 11.2820 11.9400 267,700
31 · DEF 14A After-hours · 16:30 ET DEF 14A ↗ 30 · 8-K After-hours · 16:05 ET 8-K ↗
10.7700 11.2400 9.9610 10.9600 271,200
10.6100 10.9700 10.1200 10.3800 220,300
10.9500 11.0780 10.0700 10.7000 325,900
Weekend
Weekend
12.4800 12.5200 10.4700 10.7300 472,300
29 · 8-K Pre-market · 08:01 ET 8-K ↗
12.2400 12.5600 11.2000 11.3600 165,331
12.0000 13.7600 12.0000 12.8000 296,181
28 · 8-K Pre-market · 09:00 ET 8-K ↗
13.7600 14.7200 13.4400 14.4000 86,488
No trading
Weekend
Weekend
13.7600 14.4800 13.4400 14.0000 101,166
27 · PRE 14A After-hours · 16:03 ET PRE 14A ↗ 26 · 8-K After-hours · 16:02 ET 8-K ↗
13.8400 14.0800 13.1200 14.0800 71,621
13.2800 13.8400 12.8800 13.8400 71,976
13.2000 13.8400 12.8000 13.3600 91,543
13.6800 14.4000 13.4400 13.6000 126,859
Weekend
Weekend
0.1720 0.1730 0.1640 0.1700 7,920,900
0.1760 0.1780 0.1630 0.1700 15,445,000
25 · 8-K After-hours · 16:01 ET 8-K ↗
0.1990 0.2020 0.1700 0.1740 29,152,000
0.1800 0.2140 0.1680 0.2050 47,555,300
0.1500 0.1870 0.1460 0.1750 47,109,800
Weekend
Weekend
0.1700 0.1700 0.1450 0.1550 131,355,500
24 · 8-K Pre-market · 08:01 ET 8-K ↗
0.1580 0.1640 0.1510 0.1580 6,730,400
0.1500 0.1590 0.1420 0.1570 6,913,600
0.1400 0.1480 0.1380 0.1430 6,788,700
0.1550 0.1560 0.1400 0.1400 24,056,100
Weekend
Weekend
0.1700 0.1700 0.1530 0.1540 13,858,200
23 · 8-K After-hours · 16:02 ET 8-K ↗ 22 · 10-Q After-hours · 16:01 ET 10-Q ↗
0.1760 0.1770 0.1650 0.1700 12,498,100
0.1830 0.1860 0.1730 0.1780 5,333,500
0.1800 0.1860 0.1740 0.1820 10,608,500
0.1800 0.1800 0.1690 0.1760 17,163,800
Weekend
Weekend
0.1800 0.1820 0.1730 0.1780 10,940,700
0.1770 0.1820 0.1720 0.1780 8,230,700
0.1870 0.1870 0.1750 0.1780 8,005,600
0.1700 0.1840 0.1700 0.1820 14,760,300
0.1700 0.1770 0.1600 0.1740 17,705,200
Weekend
Weekend
0.1770 0.1830 0.1650 0.1700 25,616,400
0.2040 0.2050 0.1680 0.1780 30,642,600
0.2060 0.2120 0.1820 0.2070 30,263,000
0.2680 0.2680 0.1900 0.2050 211,222,900
21 · 8-K After market open · 12:01 ET 8-K ↗
0.1730 0.2140 0.1450 0.1990 357,112,200
Weekend
Weekend
0.1450 0.1450 0.1320 0.1360 10,925,800
0.1430 0.1430 0.1360 0.1430 14,004,100
0.1420 0.1550 0.1370 0.1450 16,477,100
0.1440 0.1550 0.1420 0.1550 15,126,500
0.1700 0.1700 0.1390 0.1410 39,485,300
Weekend
Weekend
0.1660 0.1770 0.1600 0.1700 11,563,900
0.1600 0.1710 0.1430 0.1710 14,222,500
0.1330 0.1710 0.1270 0.1620 24,628,500
20 · 8-K Next filing day · accepted 14 Jul, 20:39 ET 8-K ↗
0.1440 0.1440 0.1140 0.1400 41,841,700
0.1700 0.1700 0.1400 0.1440 30,798,200
Weekend
Weekend
0.1750 0.1750 0.1600 0.1700 12,927,900
0.1720 0.1800 0.1690 0.1750 8,708,900
0.1750 0.1770 0.1660 0.1690 17,800,300
0.1910 0.2000 0.1760 0.1780 14,282,600
0.1730 0.1950 0.1660 0.1950 16,580,500
Weekend
Weekend
No trading
0.1690 0.1780 0.1640 0.1730 16,490,100
0.1670 0.1700 0.1630 0.1680 11,741,600
19 · 8-K Pre-market · 09:01 ET 8-K ↗
0.1710 0.1740 0.1620 0.1650 10,802,500
0.1620 0.1700 0.1530 0.1640 15,675,000
Weekend
Weekend
0.1680 0.1710 0.1510 0.1570 38,552,900
0.1700 0.1780 0.1610 0.1650 11,359,800
0.1710 0.1810 0.1680 0.1690 12,287,500
0.1610 0.1790 0.1560 0.1710 13,387,500
0.1760 0.1760 0.1600 0.1640 11,641,500
Weekend
Weekend
No trading
0.1950 0.2000 0.1600 0.1680 23,415,700
0.1600 0.1850 0.1550 0.1790 23,153,100
18 · 8-K Pre-market · 08:01 ET 8-K ↗
0.1680 0.1730 0.1660 0.1680 8,744,500
0.1700 0.1800 0.1660 0.1670 16,232,300
Weekend
Weekend
0.1790 0.1840 0.1600 0.1620 17,990,600
0.1590 0.1800 0.1540 0.1770 22,657,800
0.1570 0.1660 0.1400 0.1560 34,015,800
17 · DEF 14A After-hours · 16:18 ET DEF 14A ↗
0.1690 0.1690 0.1530 0.1600 13,174,800
0.1790 0.1790 0.1640 0.1660 14,269,400
Weekend
Weekend
0.1800 0.1800 0.1680 0.1750 13,195,800
16 · 8-K Next filing day · accepted 04 Jun, 19:28 ET 8-K ↗ 15 · 8-K Next filing day · accepted 04 Jun, 17:34 ET 8-K ↗
0.1860 0.1910 0.1760 0.1780 9,006,400
0.1990 0.2000 0.1830 0.1880 12,271,200
0.2020 0.2020 0.1950 0.2000 11,592,100
14 · 8-K Pre-market · 08:00 ET 8-K ↗
0.2320 0.2350 0.1980 0.1980 19,804,300
Weekend
Weekend
0.2120 0.2310 0.2030 0.2310 13,216,400
0.2110 0.2130 0.2020 0.2110 11,699,700
0.2280 0.2280 0.1980 0.2180 16,239,800
0.2190 0.2390 0.2110 0.2200 13,230,300
No trading
Weekend
Weekend
0.2000 0.2120 0.1960 0.2100 12,800,500
0.2400 0.2400 0.1900 0.2010 36,709,800
0.2000 0.2200 0.1950 0.2150 15,581,000
0.2000 0.2190 0.1950 0.1990 26,042,800
0.3000 0.3000 0.1630 0.1930 58,014,600
13 · PRE 14A Pre-market · 07:08 ET PRE 14A ↗ 12 · DEFA14A Pre-market · 07:07 ET DEFA14A ↗ 11 · 8-K Pre-market · 07:06 ET 8-K ↗
Weekend
Weekend
10 · 10-Q After-hours · 16:01 ET 10-Q ↗
0.3300 0.3400 0.3160 0.3400 5,500,900
0.3550 0.3550 0.3300 0.3300 2,707,300
0.3410 0.3550 0.3300 0.3440 3,320,900
0.3220 0.3450 0.3200 0.3410 2,684,600
0.3250 0.3390 0.3140 0.3390 3,055,600
Weekend
Weekend
0.3400 0.3490 0.3250 0.3270 3,392,900
0.3500 0.3530 0.3290 0.3440 3,894,600
0.3450 0.3600 0.3330 0.3500 4,552,100
0.3540 0.3640 0.3300 0.3360 4,346,600
0.3700 0.3800 0.3460 0.3500 3,890,800
Weekend
Weekend
0.3600 0.3700 0.3500 0.3700 2,371,500
0.3500 0.3690 0.3380 0.3680 3,456,900
0.3450 0.3600 0.3310 0.3500 5,127,900
0.3480 0.3500 0.3270 0.3450 7,900,200
0.3640 0.3800 0.3400 0.3490 6,299,100
Weekend
Weekend
9 · DEFA14A After-hours · 16:02 ET DEFA14A ↗ 8 · DEF 14A After-hours · 16:01 ET DEF 14A ↗
0.3720 0.3770 0.3610 0.3630 3,262,500
0.3920 0.3920 0.3600 0.3740 4,196,400
0.3700 0.3930 0.3700 0.3900 4,799,100
0.4180 0.4180 0.3640 0.3770 9,344,800
0.4390 0.4600 0.4140 0.4200 4,577,100
Weekend
Weekend
0.4400 0.4670 0.4340 0.4460 4,082,800
0.4500 0.4600 0.4230 0.4370 5,149,400
0.4290 0.4680 0.4240 0.4510 8,782,800
0.4020 0.4320 0.4020 0.4320 6,939,300
0.3980 0.4100 0.3810 0.4010 6,837,700
Weekend
Weekend
0.3660 0.4290 0.3660 0.4100 11,775,600
7 · 8-K After-hours · 16:01 ET 8-K ↗
0.3470 0.3780 0.3380 0.3720 7,970,700
0.3450 0.3490 0.3220 0.3470 6,916,400
0.3480 0.3500 0.3200 0.3300 8,481,700
0.3790 0.3800 0.3340 0.3460 9,805,200
Weekend
Weekend
No trading
0.3480 0.3810 0.3440 0.3700 5,810,700
0.3370 0.3780 0.3330 0.3650 10,666,100
0.3230 0.3380 0.3200 0.3290 7,205,600
0.3410 0.3500 0.3200 0.3200 7,585,600
Weekend
Weekend
0.3600 0.3800 0.3440 0.3470 9,487,100
0.3740 0.4110 0.3640 0.3750 9,464,500
0.3540 0.3970 0.3500 0.3820 15,000,600
0.3780 0.3800 0.3210 0.3450 23,456,400
0.4000 0.4090 0.3640 0.3730 28,704,200
Weekend
Weekend
0.4500 0.4500 0.4000 0.4220 29,612,200
0.4240 0.4700 0.4050 0.4520 10,720,800
0.4580 0.4700 0.4240 0.4340 10,906,000
6 · 8-K After-hours · 16:04 ET 8-K ↗ 5 · 10-K After-hours · 16:03 ET 10-K ↗
0.4540 0.4850 0.4510 0.4720 6,383,600
0.4480 0.4800 0.4430 0.4560 6,188,900
Weekend
Weekend
0.4660 0.4820 0.4360 0.4370 5,999,900
0.4800 0.4900 0.4520 0.4600 10,443,300
0.5100 0.5200 0.4900 0.4900 8,137,700
0.5600 0.5690 0.4980 0.5070 9,538,700
0.4990 0.5650 0.4830 0.5550 9,228,100
Weekend
Weekend
0.5130 0.5290 0.4850 0.5010 12,042,500
0.5700 0.5700 0.4760 0.5220 21,213,500
0.4730 0.5980 0.4650 0.5800 25,324,700
0.4200 0.5010 0.4120 0.4700 20,495,400
0.4070 0.4450 0.3920 0.4290 14,396,000
Weekend
Weekend
0.3900 0.4450 0.3900 0.4250 27,492,100
0.3710 0.4180 0.3630 0.4020 34,536,400
0.4010 0.4010 0.3310 0.3800 73,681,500
0.3880 0.4450 0.3560 0.4150 71,290,800
0.5960 0.6000 0.3320 0.4230 273,892,300
4 · 8-K Pre-market · 08:30 ET 8-K ↗
Weekend
Weekend
2.1000 2.2200 2.0600 2.1300 8,452,400
2.1800 2.2260 2.1000 2.1100 5,210,400
2.1600 2.2350 2.1100 2.1700 5,776,300
2.3000 2.3400 2.1400 2.1500 6,206,900
No trading
Weekend
Weekend
2.3400 2.4950 2.2800 2.2900 5,145,800
2.3600 2.3800 2.2700 2.3200 3,220,000
2.3300 2.3800 2.2400 2.3500 5,451,900
2.2800 2.4100 2.2600 2.3300 6,553,000
2.2700 2.3600 2.1600 2.2600 5,801,000
Weekend
Weekend
2.4750 2.5000 2.2300 2.2600 7,931,800
2.4400 2.5400 2.4000 2.4350 5,109,300
2.6600 2.6600 2.3200 2.4600 6,850,700
2.4800 2.7550 2.3820 2.6700 7,079,500
2.3000 2.6300 2.2650 2.4800 8,764,600
Weekend
Weekend
2.4300 2.4700 2.2700 2.2800 4,638,100
2.5700 2.5700 2.4000 2.4200 4,829,000
3 · S-3ASR After-hours · 16:01 ET S-3ASR ↗
2.6900 2.7200 2.5000 2.5500 5,838,300
2.6600 2.6750 2.4900 2.6400 3,584,400
2.7400 2.7790 2.6350 2.6600 2,805,100
Weekend
Weekend
2.9000 2.9200 2.6700 2.7000 4,250,700
2.7900 2.9990 2.7500 2.8700 7,513,900
2.6000 2.7550 2.5600 2.7400 6,338,800
2.4300 2.6300 2.3800 2.6000 3,948,600
No trading
Weekend
Weekend
2.4800 2.6400 2.4500 2.5200 3,874,200
2.5400 2.5800 2.4400 2.4500 2,717,200
2.6300 2.6500 2.4800 2.5500 3,508,900
2.5200 2.6900 2.4200 2.6600 5,049,100
2.5200 2.6500 2.4900 2.5200 4,221,700
Weekend
Weekend
2.5400 2.6100 2.4100 2.5000 3,403,200
2.3500 2.5400 2.3500 2.5000 7,132,800
2.5500 2.6500 2.3600 2.4100 6,886,300
2.7100 2.7600 2.5200 2.5600 5,604,400
2.9100 2.9700 2.7250 2.7400 4,470,100
Weekend
Weekend
3.1500 3.1500 2.8500 2.8800 3,855,200
No trading
3.1200 3.2100 3.0750 3.1000 3,446,100
3.2100 3.2600 3.0400 3.1200 4,106,000
3.2500 3.3500 3.2100 3.2100 4,114,200
Weekend
Weekend
3.4100 3.4600 3.1400 3.2300 4,371,100
No trading
3.2700 3.6500 3.2700 3.4400 3,250,000
3.7500 3.7700 3.2100 3.2850 5,665,700
3.4800 3.7700 3.4300 3.7700 4,263,200
Weekend
Weekend
3.4100 3.6000 3.3700 3.4400 15,018,800
3.5700 3.6100 3.4000 3.4300 4,536,800
3.6400 3.8200 3.4950 3.5700 3,704,600
3.8000 3.8650 3.5350 3.5600 4,856,700
3.7000 3.8700 3.5250 3.7900 8,630,500
Weekend
Weekend
3.7200 3.7900 3.5600 3.6000 3,479,500
3.5000 3.8000 3.4700 3.6200 4,286,600
3.4850 3.5280 3.3400 3.4900 3,054,000
3.4500 3.5400 3.4300 3.4500 1,647,500
3.3500 3.4600 3.3500 3.4100 1,842,100
Weekend
Weekend
3.3500 3.4000 3.2450 3.3300 2,223,500
3.4100 3.4300 3.3000 3.3200 2,191,700
3.0400 3.4500 3.0100 3.4200 4,711,500
3.1400 3.1500 2.9750 2.9900 3,665,600
3.2700 3.3050 3.1050 3.1400 3,601,200
Weekend
Weekend
3.3250 3.4000 3.2500 3.3400 1,137,300
No trading
3.3100 3.3700 3.2200 3.3400 1,718,500
3.2400 3.3350 3.1900 3.2700 2,389,600
3.0800 3.2300 2.9950 3.1800 2,735,000
Weekend
Weekend
3.1100 3.1700 2.9300 3.0600 2,742,500
3.2200 3.2750 3.0500 3.1100 2,952,000
3.0600 3.1950 3.0200 3.1400 3,058,700
2.9800 3.1000 2.9210 3.0500 2,897,700
2.7100 3.0600 2.6540 2.9900 6,266,500
Weekend
Weekend
2.4200 2.7700 2.4200 2.7100 2,785,200
2.6500 2.6620 2.5000 2.5100 2,324,400
2.6300 2.7100 2.5350 2.7000 3,419,300
2.4900 2.5950 2.4600 2.5900 2,299,900
2.4500 2.6200 2.4400 2.4800 4,072,700
Weekend
Weekend
2.3000 2.4100 2.2050 2.3600 2,091,500
2.2820 2.4100 2.2800 2.3100 2,346,800
2 · 8-K After-hours · 17:23 ET 8-K ↗ 1 · 10-Q After-hours · 17:23 ET 10-Q ↗
2.2900 2.3750 2.2000 2.3700 2,292,300
2.3500 2.3700 2.2800 2.3000 1,937,200
2.4900 2.4900 2.3500 2.3900 2,493,800
Weekend
Weekend
2.4300 2.5200 2.3800 2.4500 2,163,300
2.4000 2.4900 2.3600 2.4200 2,166,400
2.3800 2.4650 2.3300 2.3900 2,353,200
2.3700 2.4000 2.2810 2.3800 1,558,700
2.4800 2.5300 2.3400 2.3900 3,831,100
Weekend
Weekend
2.1500 2.4850 2.1300 2.4800 7,741,800

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.

33 8-K 8-K (opens SEC filing in a new tab) After-hours · 20:01 ET Summarise
32 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:05 ET Summarise
31 DEF 14A DEF 14A (opens SEC filing in a new tab) After-hours · 16:30 ET Summarise
30 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:05 ET Summarise
29 8-K 8-K (opens SEC filing in a new tab) Pre-market · 08:01 ET Summarise
28 8-K 8-K (opens SEC filing in a new tab) Pre-market · 09:00 ET Summarise
27 PRE 14A PRE 14A (opens SEC filing in a new tab) After-hours · 16:03 ET Summarise
26 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:02 ET Summarise
25 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:01 ET Summarise
24 8-K 8-K (opens SEC filing in a new tab) Pre-market · 08:01 ET Summarise
23 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:02 ET Summarise
22 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:01 ET Summarise
21 8-K 8-K (opens SEC filing in a new tab) After market open · 12:01 ET Summarise
20 8-K 8-K (opens SEC filing in a new tab) Next filing day · accepted 14 Jul, 20:39 ET Summarise
19 8-K 8-K (opens SEC filing in a new tab) Pre-market · 09:01 ET Summarise
18 8-K 8-K (opens SEC filing in a new tab) Pre-market · 08:01 ET Summarise
17 DEF 14A DEF 14A (opens SEC filing in a new tab) After-hours · 16:18 ET Summarise
16 8-K 8-K (opens SEC filing in a new tab) Next filing day · accepted 04 Jun, 19:28 ET Summarise
15 8-K 8-K (opens SEC filing in a new tab) Next filing day · accepted 04 Jun, 17:34 ET Summarise
14 8-K 8-K (opens SEC filing in a new tab) Pre-market · 08:00 ET Summarise
13 PRE 14A PRE 14A (opens SEC filing in a new tab) Pre-market · 07:08 ET Summarise
12 DEFA14A DEFA14A (opens SEC filing in a new tab) Pre-market · 07:07 ET Summarise
11 8-K 8-K (opens SEC filing in a new tab) Pre-market · 07:06 ET Summarise
10 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:01 ET Summarise
9 DEFA14A DEFA14A (opens SEC filing in a new tab) After-hours · 16:02 ET Summarise
8 DEF 14A DEF 14A (opens SEC filing in a new tab) After-hours · 16:01 ET Summarise
7 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:01 ET Summarise
6 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:04 ET Summarise
5 10-K 10-K (opens SEC filing in a new tab) After-hours · 16:03 ET Summarise
4 8-K 8-K (opens SEC filing in a new tab) Pre-market · 08:30 ET Summarise
3 S-3ASR S-3ASR (opens SEC filing in a new tab) After-hours · 16:01 ET Summarise
2 8-K 8-K (opens SEC filing in a new tab) After-hours · 17:23 ET Summarise
1 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 17:23 ET Summarise