Prothena Corporation plc PRTA

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Prothena Corporation plc - Ordinary Shares · Company · Nasdaq · Healthcare / Biotechnology

Paper trade (simulated — no real money)

Fill: USD 8.2000 · FX 1 USD = 1.277900 SGD · about SGD 10.4788 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 10.37 → 8.20 · -20.9%
11.5109.7107.910 1,2,3 4 5 6 7,8 9,10 11,12 13 14,15 16 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
8.1800 8.2600 7.9300 8.2000 385,913
8.0100 8.2850 7.9600 8.2500 381,800
8.4700 8.5400 8.0100 8.0300 461,400
8.5500 8.6450 8.4500 8.5000 529,000
8.3900 8.5700 8.3100 8.4800 361,100
Weekend
Weekend
8.5800 8.6200 8.2400 8.3500 670,300
8.5400 8.6500 8.4400 8.5000 358,400
8.2800 8.5600 8.1900 8.3700 619,100
8.4500 8.5500 8.2000 8.3600 573,300
8.8100 8.8100 8.3950 8.4300 489,800
Weekend
Weekend
8.5700 9.3050 8.5000 8.8400 931,600
8.4300 8.8100 8.3600 8.6100 642,400
7.9300 8.6300 7.8800 8.4800 690,400
8.2800 8.2800 7.8000 8.0200 508,300
8.3350 8.3700 7.9100 8.2700 714,500
Weekend
Weekend
16 · 8-K After-hours · 20:17 ET 8-K ↗
8.6200 8.6200 8.3500 8.3600 675,800
8.5400 8.5800 8.3500 8.5400 457,100
8.9800 8.9900 8.3650 8.3800 634,800
8.6600 8.8000 8.5900 8.7800 602,300
8.2500 8.8600 8.0730 8.7200 488,900
Weekend
Weekend
8.3800 8.5200 8.1850 8.2900 481,000
8.6300 8.7300 8.2800 8.3200 426,100
8.9400 8.9700 8.6650 8.6800 357,800
8.7200 9.0900 8.7000 8.9900 445,500
8.5900 8.7950 8.4600 8.5100 361,900
Weekend
Weekend
8.4100 8.6000 8.2500 8.5800 1,830,900
8.3900 8.5600 8.2300 8.4600 404,800
8.3500 8.5000 8.2000 8.2400 398,300
8.8600 8.8600 8.2950 8.3300 323,400
8.9500 8.9900 8.7900 8.8600 374,900
Weekend
Weekend
9.0600 9.1400 8.7650 8.9300 376,300
9.2500 9.2550 8.9700 9.0200 310,800
9.4000 9.4960 9.2200 9.3000 294,600
9.6000 9.6700 9.3450 9.5400 305,400
No trading
Weekend
Weekend
9.5000 9.8700 9.4800 9.8200 383,900
9.7700 9.7800 9.5120 9.6000 275,200
9.6400 9.7500 9.3700 9.6850 341,100
9.2800 9.6300 9.2600 9.6100 267,700
9.2600 9.4000 9.1000 9.3500 335,100
Weekend
Weekend
9.0200 9.4790 8.9500 9.3300 498,100
9.1600 9.2400 8.9500 9.0900 338,900
9.4000 9.4000 9.1530 9.2500 289,000
9.5100 9.8200 9.4200 9.4200 363,700
9.4600 9.4900 9.1900 9.3900 248,100
Weekend
Weekend
9.1100 9.5200 9.0900 9.4500 376,000
9.1300 9.1450 8.7100 9.0300 346,000
8.9100 9.3400 8.9100 9.2900 385,500
8.8800 9.0000 8.5800 8.7100 248,600
8.8400 9.0750 8.7290 8.8800 365,900
Weekend
Weekend
9.0400 9.1500 8.8390 8.8600 312,600
9.3000 9.3650 9.0400 9.0800 343,100
9.2200 9.3100 9.0900 9.2600 274,900
9.1200 9.2850 8.8620 9.2200 475,300
8.7600 9.1700 8.5300 9.1200 713,700
Weekend
Weekend
8.5400 8.8500 8.0400 8.7600 481,900
15 · 10-Q After-hours · 16:20 ET 10-Q ↗ 14 · 8-K After-hours · 16:16 ET 8-K ↗
8.5000 8.7660 8.3300 8.5800 418,600
8.4900 8.7350 8.4050 8.4900 489,500
8.3300 8.5800 8.3300 8.4900 329,900
8.1700 8.3800 8.0400 8.3300 566,000
Weekend
Weekend
8.4100 8.5100 8.0000 8.1200 545,500
8.5000 8.5550 8.2550 8.4100 502,200
8.4500 8.6800 8.3900 8.5600 641,200
8.7000 8.7800 8.3600 8.5600 802,200
8.8800 9.1300 8.6600 8.7000 704,700
Weekend
Weekend
8.5400 8.8250 8.3500 8.7500 576,800
8.2700 8.6250 8.2300 8.5300 532,200
8.6900 8.7900 8.4300 8.4400 542,500
8.7200 8.8100 8.5100 8.7500 647,600
8.6600 8.8500 8.5450 8.6700 549,600
Weekend
Weekend
8.4000 8.7990 8.2750 8.6600 408,400
8.4000 8.6600 8.0750 8.4700 659,700
8.5800 8.6300 8.4200 8.4300 504,700
8.7700 8.8800 8.6100 8.6400 530,300
9.1700 9.1900 8.7600 8.8300 781,700
Weekend
Weekend
9.6400 9.8200 9.0300 9.2400 505,100
9.8300 10.0200 9.5500 9.6400 482,200
9.6600 9.8600 9.5600 9.8500 444,200
9.6200 9.7800 9.3300 9.6800 520,500
9.6500 9.8400 9.4650 9.5000 403,700
Weekend
Weekend
No trading
9.6100 10.1500 9.5700 9.6900 462,900
9.7400 10.0000 9.4700 9.5800 436,700
9.9600 10.0400 9.7500 9.7900 339,600
10.0000 10.1200 9.7800 9.9700 420,300
Weekend
Weekend
9.3200 10.0900 9.2800 10.0200 1,914,400
9.4200 9.5800 9.1900 9.2700 964,900
9.5700 9.8700 9.2630 9.4000 477,900
9.1200 9.7700 9.1200 9.5500 458,000
8.9000 9.2700 8.8900 9.1500 612,500
Weekend
Weekend
No trading
8.6300 9.1500 8.5150 8.9300 1,390,800
8.3900 8.7200 8.3900 8.4900 543,000
8.1600 8.3500 7.8500 8.2900 586,300
8.6900 8.7700 7.9300 8.1500 622,600
Weekend
Weekend
8.2600 8.4500 8.2250 8.2500 315,400
7.8900 8.4600 7.7300 8.2600 634,200
8.4200 8.5900 7.8900 7.9100 457,000
8.5600 8.8700 8.3450 8.4700 493,500
8.8000 8.8900 8.5300 8.5600 313,200
Weekend
Weekend
9.2500 9.3800 8.6300 8.7900 656,300
9.0300 9.4500 9.0300 9.2500 504,900
9.2100 9.2100 8.7300 8.9200 593,200
9.5900 9.5900 9.1190 9.1900 439,000
10.0300 10.0700 9.4950 9.5900 457,800
Weekend
Weekend
9.9300 10.2350 9.8000 10.1800 501,400
9.9500 10.0500 9.9300 9.9800 281,800
10.1100 10.2600 10.0050 10.0300 616,200
9.8400 10.0700 9.4500 10.0600 918,600
No trading
Weekend
Weekend
9.3600 10.0000 9.3600 9.8300 510,900
9.1600 9.4200 9.0400 9.4100 388,700
9.0900 9.4100 9.0900 9.3500 624,900
9.6100 9.8400 9.0200 9.0700 627,300
9.6600 10.0900 9.5300 9.5900 651,000
Weekend
Weekend
13 · 8-K After-hours · 16:31 ET 8-K ↗
9.7300 9.8600 9.4600 9.7600 700,100
9.6000 9.8800 9.4200 9.8600 452,400
9.3300 9.7300 9.2800 9.6000 530,800
9.6700 9.8200 9.2850 9.4300 495,100
10.7900 10.8800 9.4600 9.6700 932,800
Weekend
Weekend
11.0000 11.8000 10.6200 10.7300 798,700
12 · 10-Q After-hours · 16:20 ET 10-Q ↗ 11 · 8-K After-hours · 16:14 ET 8-K ↗
11.1000 11.2050 10.4000 10.5200 443,100
11.1900 11.2950 11.0200 11.1800 333,900
10.8900 11.2500 10.8900 11.1900 306,800
10.5800 11.0000 10.5500 10.7900 592,400
Weekend
Weekend
11.0400 11.1350 10.6400 10.6400 516,300
10.8900 11.1200 10.8400 11.0600 319,500
11.4600 11.4600 10.7400 10.8700 397,700
10.8400 11.5700 10.8300 11.5100 439,900
10.7100 11.1200 10.7100 10.7900 314,000
Weekend
Weekend
10.6500 10.8200 10.4000 10.7500 287,900
10.6900 11.0700 10.6000 10.7300 474,700
10.6900 10.8450 10.6100 10.7200 350,800
10.7800 10.7800 10.4800 10.6700 451,100
10.8200 10.9700 10.7700 10.7900 333,300
Weekend
Weekend
10.7100 10.9850 10.7000 10.9000 486,500
10.7800 10.8450 10.4450 10.5200 298,900
10.6200 10.8650 10.5050 10.8200 409,900
10.3400 10.6700 10.3400 10.6100 370,900
10.4900 10.5500 10.1800 10.3100 334,100
Weekend
Weekend
10.6000 10.6000 10.3700 10.5000 319,000
10.4700 10.7000 10.3790 10.5800 414,700
10.4800 10.6750 10.2900 10.6500 454,500
9.9800 10.3700 9.8000 10.3600 481,400
9.9100 10.1050 9.8800 10.0400 412,500
Weekend
Weekend
No trading
9.7500 10.0800 9.5100 9.8600 849,100
9.8400 10.1150 9.8000 10.0300 593,300
9.3300 9.8600 9.3300 9.7200 671,500
9.2400 9.5000 9.1100 9.2500 416,200
Weekend
Weekend
10 · DEF 14A After-hours · 16:03 ET DEF 14A ↗ 9 · DEFA14A After-hours · 16:13 ET DEFA14A ↗
9.4200 9.6200 9.1400 9.2600 430,100
9.1900 9.6800 9.1580 9.5200 452,700
8.8400 9.3150 8.8200 9.3100 543,700
8.7500 8.9550 8.4850 8.7300 534,700
8.8300 9.0400 8.7600 8.8200 487,600
Weekend
Weekend
8.5400 8.7600 8.4400 8.7500 1,401,600
8.5400 8.6300 8.3780 8.5400 467,800
8.9400 8.9450 8.5300 8.5900 495,900
9.1000 9.2000 8.9550 9.0000 467,100
9.2700 9.3150 9.0600 9.1700 511,800
Weekend
Weekend
9.4000 9.5400 8.9950 9.2100 584,500
9.4800 9.4800 9.0900 9.3100 737,000
9.7000 9.8400 9.2550 9.5800 701,200
10.2100 10.2700 9.6800 9.7700 628,400
9.2700 9.9500 9.2200 9.8100 626,500
Weekend
Weekend
9.2400 9.6400 9.2400 9.5900 651,800
9.7000 10.0630 9.3600 9.4600 509,800
9.3600 9.9600 9.3600 9.8600 543,300
9.0900 9.6150 8.9500 9.3600 553,400
9.0900 9.6150 8.9650 9.4000 811,100
Weekend
Weekend
8 · 8-K After-hours · 16:45 ET 8-K ↗ 7 · 10-K After-hours · 16:04 ET 10-K ↗
8.5300 8.7900 8.4800 8.6700 439,400
8.8800 8.9550 8.6300 8.6400 355,700
9.0000 9.1100 8.5300 8.8800 490,500
9.0300 9.3000 8.7500 8.9700 448,800
9.0000 9.3400 8.8100 9.0700 465,800
Weekend
Weekend
9.3800 9.5900 8.1950 9.0200 786,400
6 · 8-K After-hours · 16:07 ET 8-K ↗
9.0600 9.2000 8.8000 9.0300 349,700
8.8100 9.2250 8.8050 9.0900 307,600
8.9600 9.2050 8.7950 8.9600 374,800
No trading
Weekend
Weekend
8.8500 9.2400 8.8450 8.9600 308,600
8.9300 9.0400 8.7200 8.8500 351,700
9.0100 9.0900 8.6500 8.9300 271,100
8.8100 9.1200 8.7700 8.9600 329,500
8.9000 9.0400 8.5900 8.8600 356,100
Weekend
Weekend
8.5800 8.9900 8.5600 8.9100 581,000
8.8600 9.0450 8.2300 8.3500 518,900
8.7700 9.0400 8.4800 8.8900 451,800
8.9000 9.0500 8.6100 8.7800 280,900
8.7900 8.9500 8.3900 8.9100 556,700
Weekend
Weekend
8.9800 9.0700 8.6500 8.8100 390,000
9.1500 9.5000 8.9500 9.0600 362,300
9.6900 9.7750 9.1000 9.1400 422,200
9.9200 10.0900 9.6800 9.7300 393,100
9.9400 10.2600 9.7650 9.9400 470,300
Weekend
Weekend
10.3000 10.5300 9.9900 10.0000 659,500
9.6800 10.3500 9.6650 10.3400 512,700
9.2800 9.7200 9.2400 9.6800 591,400
9.1200 9.5450 9.0000 9.2500 630,800
No trading
Weekend
Weekend
9.2900 9.4500 8.9350 9.3500 761,500
9.1600 9.2750 8.9100 9.2600 602,000
8.9400 9.2600 8.8400 9.2000 398,500
8.7700 9.0600 8.7700 8.9800 470,400
9.1600 9.1600 8.6500 8.9100 585,600
Weekend
Weekend
9.1900 9.3350 9.1100 9.1900 401,900
9.0300 9.1600 8.9500 9.0500 376,000
9.0000 9.4650 8.9600 9.1300 468,700
9.0100 9.1400 8.8850 8.9700 636,400
9.2400 9.2400 8.9200 9.1000 539,100
Weekend
Weekend
9.5600 9.6900 9.0700 9.2000 526,900
No trading
9.3000 9.5600 9.2400 9.5500 475,100
9.4500 9.5200 9.2900 9.3100 363,500
9.4900 9.5450 9.3350 9.4800 495,900
Weekend
Weekend
9.6700 9.6700 9.4300 9.5400 424,600
No trading
9.4600 9.7400 9.2300 9.6900 237,400
9.5300 9.5900 9.2900 9.4900 703,400
9.1600 9.7800 9.0700 9.6800 688,000
Weekend
Weekend
9.3800 9.5600 9.1100 9.2100 4,129,700
9.4600 9.6700 9.3200 9.3800 547,600
9.7800 9.9100 9.3900 9.4300 508,000
9.9500 10.1600 9.5200 9.7500 638,900
10.3700 10.5000 9.9400 9.9700 852,600
Weekend
Weekend
5 · 8-K After-hours · 16:26 ET 8-K ↗
10.4000 10.4900 10.1950 10.3600 477,700
9.9300 10.5000 9.8100 10.3300 693,400
10.2800 10.3200 9.6900 9.8700 961,400
10.7000 10.8000 10.2300 10.3200 532,200
11.2000 11.3000 10.7100 10.7300 561,900
Weekend
Weekend
11.1800 11.4800 10.9750 11.0700 434,700
11.0400 11.5700 10.9500 11.1600 1,161,200
10.4000 11.4800 10.3100 11.1700 777,500
10.2900 10.5300 10.1400 10.3500 615,100
10.9800 11.1300 10.2150 10.2700 648,500
Weekend
Weekend
10.5200 10.8250 10.4550 10.7500 288,700
No trading
10.4800 10.5900 10.3700 10.4300 451,400
10.5000 10.6200 10.3000 10.5000 515,600
10.5500 10.9100 10.2900 10.4000 776,100
Weekend
Weekend
10.0200 10.6900 9.9000 10.4800 461,200
10.1200 10.5100 9.9900 10.0500 460,500
4 · 8-K After-hours · 16:30 ET 8-K ↗
10.2900 10.4900 9.9700 9.9900 479,700
10.1800 10.4200 9.9600 10.3600 427,900
9.9400 10.3200 9.7500 10.2500 827,200
Weekend
Weekend
10.0400 10.3300 9.9300 9.9300 504,500
10.8300 10.8300 10.1200 10.1800 679,600
10.3600 10.9000 10.2200 10.8500 686,400
10.3900 10.7500 10.1350 10.4800 603,600
10.9000 11.0900 10.4650 10.5300 694,700
Weekend
Weekend
10.4900 10.9600 9.7200 10.5600 928,400
3 · 10-Q After-hours · 16:28 ET 10-Q ↗ 2 · 8-K After-hours · 16:09 ET 8-K ↗ 1 · DEFA14A After-hours · 16:18 ET DEFA14A ↗
10.3000 10.4950 10.0150 10.0800 557,200
10.1700 10.4500 10.0000 10.2700 535,300
10.4000 10.5600 10.1600 10.2600 600,300
10.7550 11.1700 10.4050 10.5400 612,500
Weekend
Weekend
10.5400 10.7850 10.4000 10.7500 479,600
10.6300 10.8150 10.3450 10.4800 381,500
10.6000 10.7950 10.3400 10.6500 596,000
11.1400 11.6900 10.4000 10.5400 969,200
9.9800 10.4000 9.9500 10.3700 405,300
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.

16 8-K 8-K (opens SEC filing in a new tab) After-hours · 20:17 ET Summarise
15 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:20 ET Summarise
14 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:16 ET Summarise
13 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:31 ET Summarise
12 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:20 ET Summarise
11 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:14 ET Summarise
10 DEF 14A DEF 14A (opens SEC filing in a new tab) After-hours · 16:03 ET Summarise
9 DEFA14A DEFA14A (opens SEC filing in a new tab) After-hours · 16:13 ET Summarise
8 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:45 ET Summarise
7 10-K 10-K (opens SEC filing in a new tab) After-hours · 16:04 ET Summarise
6 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:07 ET Summarise
5 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:26 ET Summarise
4 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:30 ET Summarise
3 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:28 ET Summarise
2 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:09 ET Summarise
1 DEFA14A DEFA14A (opens SEC filing in a new tab) After-hours · 16:18 ET Summarise