Alector, Inc ALEC

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

Paper trade (simulated — no real money)

Fill: USD 1.8300 · FX 1 USD = 1.277900 SGD · about SGD 2.3386 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 1.50 → 1.83 · 22.0%
2.7201.9301.140 1,2 3 4,5 6 7,8 9,10,11,12 13 14 15,16 17 18 19,20 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
1.7800 1.8400 1.7200 1.8300 1,112,855
1.8600 1.8800 1.7400 1.8300 1,479,700
1.9700 2.0000 1.8500 1.8700 1,141,600
1.9600 2.0400 1.9150 1.9700 2,021,100
1.8500 1.9900 1.7650 1.9500 2,366,700
Weekend
Weekend
20 · 424B5 After-hours · 20:51 ET 424B5 ↗ 19 · 8-K After-hours · 20:47 ET 8-K ↗
2.1800 2.1800 1.7900 1.8400 5,156,600
1.9200 1.9500 1.8500 1.9100 1,629,300
18 · 8-K After market open · 13:00 ET 8-K ↗
1.8400 1.9190 1.8200 1.8800 2,912,400
2.0700 2.0800 1.7750 1.8700 2,843,600
2.0800 2.1400 2.0200 2.0800 1,626,600
Weekend
Weekend
2.0100 2.1450 2.0000 2.0800 3,118,500
1.9000 2.0600 1.8800 2.0200 6,449,800
1.7800 1.9200 1.7300 1.9200 3,963,700
2.0800 2.2300 1.7500 1.8100 10,177,300
17 · 8-K After market open · 11:00 ET 8-K ↗
2.7250 2.7300 1.9600 1.9900 89,983,700
Weekend
Weekend
1.8900 1.9650 1.8000 1.8100 1,165,300
1.8200 1.9100 1.8050 1.8600 774,600
1.8800 1.9490 1.8300 1.8500 792,700
1.9500 1.9500 1.8600 1.8700 960,700
1.9200 1.9550 1.8600 1.9200 713,300
Weekend
Weekend
1.9200 2.0500 1.9000 1.9500 1,024,500
2.0200 2.0500 1.9050 1.9200 849,300
2.0000 2.0200 1.9500 2.0200 1,182,700
1.9700 2.0350 1.9300 2.0100 1,464,200
1.9000 1.9450 1.8500 1.9300 1,281,200
Weekend
Weekend
1.8500 1.9100 1.7900 1.9100 2,118,700
1.9600 1.9700 1.8300 1.8500 931,200
2.0600 2.0600 1.9100 1.9250 622,300
2.1900 2.2090 1.9850 2.0350 715,900
2.1500 2.2250 2.0950 2.2100 2,467,800
Weekend
Weekend
2.1700 2.2200 2.0200 2.1400 4,699,000
2.2200 2.2400 2.0000 2.1400 3,780,800
2.4700 2.4700 2.2500 2.2700 505,600
2.3800 2.6100 2.3300 2.4700 916,100
No trading
Weekend
Weekend
2.5200 2.5750 2.4400 2.4600 496,600
2.7000 2.7500 2.4350 2.5100 2,792,300
2.4000 2.7600 2.4000 2.7200 1,667,400
2.2400 2.4860 2.2200 2.4000 482,300
2.3200 2.3500 2.2300 2.2600 610,100
Weekend
Weekend
2.3900 2.4400 2.3150 2.3400 542,200
2.4400 2.5000 2.3900 2.3900 706,900
2.3800 2.5150 2.2600 2.4600 995,500
2.3200 2.4550 2.2800 2.3600 557,300
2.3600 2.4650 2.2900 2.3000 738,100
Weekend
Weekend
2.2800 2.3700 2.2000 2.3600 728,100
2.4000 2.4600 2.1850 2.2600 662,200
2.2450 2.5250 2.1550 2.4300 3,755,600
2.0400 2.3000 2.0400 2.2100 4,774,000
1.9100 2.0900 1.9000 2.0500 913,800
Weekend
Weekend
2.0400 2.0700 1.9450 1.9600 649,000
2.1500 2.1500 1.9800 2.0400 1,294,800
2.0600 2.1750 2.0200 2.1500 786,200
1.6800 2.1290 1.6500 2.0900 5,543,300
1.7700 1.7800 1.6000 1.6900 805,600
Weekend
Weekend
1.8400 2.0000 1.7400 1.7800 1,247,000
16 · 10-Q After-hours · 16:15 ET 10-Q ↗ 15 · 8-K After-hours · 16:10 ET 8-K ↗
1.4900 2.0350 1.4820 1.8300 5,704,400
1.5600 1.5700 1.4600 1.4900 392,300
1.5100 1.6100 1.5100 1.5400 407,200
1.5100 1.5400 1.4550 1.5100 359,900
Weekend
Weekend
1.6200 1.6200 1.4850 1.5100 548,300
1.5200 1.6700 1.5100 1.6200 453,200
1.5100 1.5650 1.4900 1.5200 307,900
1.5100 1.5400 1.4750 1.5200 342,800
1.4900 1.5750 1.4700 1.5100 229,000
Weekend
Weekend
1.5000 1.5050 1.4550 1.4800 325,300
1.4800 1.5450 1.4700 1.4900 607,100
1.5300 1.5350 1.4900 1.5300 333,300
1.4200 1.5500 1.4200 1.5400 499,600
1.4900 1.5000 1.4150 1.4300 463,900
Weekend
Weekend
1.4300 1.5190 1.4200 1.5000 500,200
1.4000 1.5000 1.3900 1.4700 713,500
1.3900 1.5300 1.3700 1.5000 719,600
1.5300 1.5300 1.3700 1.3900 529,700
1.6000 1.6100 1.4950 1.5100 775,700
Weekend
Weekend
1.6300 1.6600 1.4750 1.6100 597,200
1.8300 1.8600 1.6000 1.6350 589,200
14 · 8-K After-hours · 16:05 ET 8-K ↗
1.9000 1.9400 1.8050 1.8300 643,800
1.9700 1.9700 1.8550 1.9300 416,200
2.0600 2.0650 1.9250 1.9400 588,500
Weekend
Weekend
No trading
2.0200 2.1450 1.9950 2.0600 394,000
1.9900 2.0700 1.9550 2.0100 368,500
2.1000 2.1350 1.9800 2.0100 609,400
1.8800 2.0900 1.7700 2.0800 544,200
Weekend
Weekend
1.8400 1.9550 1.8400 1.8600 3,845,400
1.7900 2.0200 1.7450 1.8500 2,828,200
1.7800 1.8700 1.7800 1.7900 510,400
1.7500 1.8700 1.7200 1.8300 854,000
1.7600 1.9200 1.7150 1.7800 1,592,800
Weekend
Weekend
No trading
1.5800 1.7700 1.5650 1.7500 1,108,400
13 · 8-K After-hours · 16:05 ET 8-K ↗
1.5500 1.6000 1.5300 1.5600 496,000
1.4700 1.5500 1.4100 1.5400 712,000
1.5600 1.5950 1.4600 1.4800 629,600
Weekend
Weekend
1.5800 1.6050 1.5300 1.5300 263,800
1.5200 1.7400 1.4850 1.5700 428,200
1.6900 1.6900 1.4850 1.5200 428,800
1.6400 1.6800 1.5850 1.6300 439,500
1.6500 1.6650 1.5700 1.6400 667,800
Weekend
Weekend
1.8100 1.8400 1.6250 1.6350 364,300
1.7900 1.9150 1.7900 1.8100 449,400
1.9400 1.9400 1.7050 1.7750 1,691,700
2.0400 2.0700 1.9200 1.9500 1,561,000
2.1600 2.1600 2.0700 2.0700 705,800
Weekend
Weekend
2.1500 2.2500 2.0500 2.1600 993,200
2.2100 2.2400 2.1000 2.1500 1,300,400
2.2000 2.2800 2.1700 2.2100 462,400
2.2100 2.3200 2.1200 2.1900 480,600
No trading
Weekend
Weekend
2.2200 2.2700 2.1700 2.2100 328,100
2.1100 2.2400 2.0100 2.2100 929,700
2.1100 2.2350 2.1100 2.1200 898,500
2.1000 2.1600 2.0190 2.1100 790,400
2.1300 2.1800 2.0450 2.1200 814,500
Weekend
Weekend
2.2400 2.2900 2.1400 2.1600 1,104,600
2.2400 2.3700 2.1970 2.3000 783,200
2.1200 2.2050 2.0900 2.1500 459,100
2.0300 2.2050 2.0300 2.1600 437,300
2.1000 2.2000 2.0050 2.0500 389,100
Weekend
Weekend
2.1200 2.3300 2.0930 2.1000 720,500
12 · 8-K After-hours · 17:15 ET 8-K ↗ 11 · 424B5 After-hours · 17:13 ET 424B5 ↗ 10 · 10-Q After-hours · 16:17 ET 10-Q ↗ 9 · 8-K After-hours · 16:12 ET 8-K ↗
2.5600 2.5600 2.4120 2.4400 276,500
2.5800 2.7000 2.5650 2.5700 470,600
2.5400 2.6150 2.5310 2.5700 361,200
2.3500 2.5450 2.3500 2.5100 447,500
Weekend
Weekend
2.3300 2.3850 2.2850 2.3600 420,300
2.2900 2.4350 2.1500 2.3700 713,200
2.3600 2.3820 2.2700 2.3000 369,000
8 · DEFA14A After-hours · 16:06 ET DEFA14A ↗ 7 · DEF 14A After-hours · 16:05 ET DEF 14A ↗
2.3500 2.4200 2.3500 2.3900 297,100
2.4100 2.4650 2.3300 2.3500 592,900
Weekend
Weekend
2.4200 2.5300 2.3600 2.4100 320,600
2.5200 2.5200 2.3750 2.4300 303,400
2.4800 2.7000 2.3700 2.4500 1,421,400
2.7000 2.7300 2.4500 2.4600 298,700
2.5600 2.7390 2.5600 2.7050 324,900
Weekend
Weekend
2.6200 2.6200 2.4900 2.5700 343,100
2.5200 2.6650 2.4700 2.5500 561,000
2.5300 2.6100 2.4950 2.5800 538,400
2.3500 2.4450 2.3400 2.4100 394,000
2.4400 2.4400 2.2750 2.3300 362,200
Weekend
Weekend
2.4000 2.5300 2.4000 2.4500 573,000
2.3800 2.4150 2.3400 2.4000 271,200
2.5800 2.6000 2.3850 2.4200 340,400
2.3400 2.4900 2.3000 2.4700 562,100
2.4100 2.4900 2.3250 2.3450 582,300
Weekend
Weekend
No trading
2.4500 2.5200 2.1250 2.4100 1,316,700
2.1800 2.6350 2.1600 2.5300 3,304,100
2.0300 2.1900 2.0300 2.1500 352,400
2.0200 2.0500 1.9500 2.0200 384,100
Weekend
Weekend
2.0900 2.1500 1.9800 2.0000 466,500
2.0300 2.1700 2.0300 2.1200 388,200
2.1200 2.2200 2.1200 2.1700 589,300
1.9700 2.1400 1.9700 2.0800 594,300
2.1100 2.1600 2.0350 2.0600 408,700
Weekend
Weekend
2.0600 2.1000 2.0050 2.0500 1,924,600
2.0000 2.1050 1.9600 2.0600 379,800
2.1900 2.2050 2.0050 2.0500 558,900
2.2200 2.2800 2.1690 2.2300 515,900
2.2900 2.2900 2.1900 2.2100 372,300
Weekend
Weekend
2.2400 2.3250 2.1350 2.2000 648,700
6 · S-3 After-hours · 16:08 ET S-3 ↗
2.2000 2.3200 2.2000 2.2300 623,700
2.3500 2.3750 2.2100 2.3200 813,200
2.3900 2.6500 2.3700 2.3800 1,822,900
1.9400 2.2050 1.9400 2.1900 939,000
Weekend
Weekend
1.9400 2.0300 1.8900 2.0000 684,100
2.1500 2.1500 1.9350 1.9800 1,100,200
2.2100 2.2100 2.0800 2.1500 734,000
2.1700 2.1700 2.0550 2.1100 647,100
2.3700 2.3700 2.0400 2.2100 1,992,200
Weekend
Weekend
2.5100 2.5290 2.3150 2.4300 1,337,500
2.1200 2.5700 2.0700 2.5600 1,311,400
5 · 10-K After-hours · 16:15 ET 10-K ↗ 4 · 8-K After-hours · 16:10 ET 8-K ↗
2.2000 2.4250 2.1850 2.3900 992,600
2.1000 2.2250 2.0600 2.1900 528,900
1.9800 2.1200 1.9300 2.1000 840,600
Weekend
Weekend
1.9700 2.0300 1.9300 1.9900 486,400
1.9800 2.0400 1.9400 2.0100 563,800
1.9900 2.0400 1.9450 1.9800 518,700
1.8800 2.0000 1.8600 1.9700 669,200
No trading
Weekend
Weekend
1.9000 2.0250 1.8400 1.8700 1,238,000
1.9300 1.9800 1.8800 1.9000 1,319,800
1.9600 1.9700 1.8600 1.9200 590,800
1.9800 1.9800 1.8900 1.9500 928,800
1.9000 1.9950 1.8850 1.9600 437,900
Weekend
Weekend
1.8300 1.9600 1.8300 1.9600 1,161,400
1.8100 1.9000 1.7450 1.8200 1,665,900
1.9600 1.9750 1.8700 1.9300 722,700
1.9800 2.0500 1.8850 1.9300 789,300
1.8700 2.0300 1.8400 1.9900 851,200
Weekend
Weekend
1.8700 1.9000 1.8100 1.8900 1,204,500
1.9300 1.9400 1.9000 1.9100 469,500
1.9600 1.9650 1.8500 1.9100 778,000
1.9500 1.9800 1.9100 1.9500 226,800
1.9300 2.0000 1.9000 1.9300 773,900
Weekend
Weekend
1.8900 1.9400 1.8800 1.9400 671,900
1.8720 1.9950 1.8720 1.9200 516,900
1.8200 1.9300 1.8050 1.9200 691,500
1.8100 1.8600 1.7650 1.8300 1,181,400
No trading
Weekend
Weekend
1.8000 1.9800 1.7800 1.8400 1,207,200
1.7900 1.8450 1.7400 1.8200 2,106,000
1.9200 1.9300 1.8400 1.8500 1,286,900
1.8500 1.9350 1.8000 1.9200 739,000
1.8400 1.8500 1.7100 1.8400 1,271,900
Weekend
Weekend
1.7900 1.8700 1.7600 1.8600 1,330,000
1.7000 1.7900 1.6910 1.7700 1,001,900
1.7100 1.7650 1.6850 1.7600 1,259,300
1.5800 1.7050 1.5550 1.6900 1,421,100
1.5100 1.6000 1.5100 1.6000 1,368,900
Weekend
Weekend
1.5700 1.6200 1.5000 1.5300 638,700
No trading
1.5100 1.5800 1.5050 1.5600 768,800
1.5200 1.5400 1.4900 1.5200 676,100
1.4400 1.5300 1.4400 1.5200 1,576,200
Weekend
Weekend
1.4400 1.4750 1.4030 1.4500 640,200
No trading
1.4200 1.4700 1.4200 1.4500 401,000
1.4200 1.4700 1.4000 1.4100 1,095,700
1.4000 1.4900 1.4000 1.4500 1,113,400
Weekend
Weekend
1.3700 1.4500 1.3500 1.4000 3,004,700
1.3600 1.4500 1.3440 1.3900 1,296,800
1.3900 1.4150 1.3350 1.3500 641,000
1.3900 1.4500 1.3500 1.3900 853,600
1.5200 1.5200 1.4200 1.4200 1,219,600
Weekend
Weekend
3 · 8-K After-hours · 16:10 ET 8-K ↗
1.4600 1.5400 1.4110 1.4900 1,474,100
1.3100 1.5400 1.2900 1.4600 5,002,400
1.2700 1.3100 1.2550 1.3000 978,000
1.2200 1.2900 1.1800 1.2800 2,353,000
1.2400 1.2700 1.2000 1.2200 1,642,700
Weekend
Weekend
1.2100 1.2600 1.1900 1.2200 1,355,400
1.1200 1.2500 1.1100 1.2100 2,787,900
1.1400 1.1570 1.0900 1.1400 2,416,700
1.2300 1.2400 1.1300 1.1400 1,397,900
1.3000 1.3200 1.2150 1.2300 1,215,500
Weekend
Weekend
1.3600 1.3600 1.3000 1.3300 569,500
No trading
1.2700 1.3900 1.2700 1.3500 1,338,800
1.2800 1.3400 1.2600 1.2800 821,600
1.2600 1.3000 1.2600 1.2800 1,359,100
Weekend
Weekend
1.2000 1.2850 1.1900 1.2400 1,066,300
1.2600 1.3500 1.1900 1.2000 2,114,200
1.2800 1.3500 1.2100 1.2200 1,529,900
1.2400 1.3300 1.2100 1.2700 1,709,400
1.1900 1.2950 1.1600 1.2400 1,616,400
Weekend
Weekend
1.2300 1.2950 1.2100 1.2400 1,648,000
1.3200 1.3600 1.1950 1.2000 2,597,400
1.3400 1.4350 1.3000 1.3400 2,700,800
1.3000 1.3850 1.3000 1.3600 1,343,600
1.2700 1.4090 1.2600 1.3100 1,712,400
Weekend
Weekend
1.2700 1.2900 1.1700 1.2800 1,976,900
2 · 10-Q After-hours · 16:17 ET 10-Q ↗ 1 · 8-K After-hours · 16:12 ET 8-K ↗
1.2500 1.3350 1.2200 1.3000 2,363,400
1.3200 1.3300 1.2500 1.2550 1,772,300
1.4000 1.4350 1.2900 1.3200 2,687,700
1.4600 1.5000 1.3900 1.4400 1,642,900
Weekend
Weekend
1.5200 1.5600 1.4000 1.4700 4,420,500
1.5500 1.6550 1.5000 1.5200 2,580,700
1.5100 1.6800 1.4900 1.5500 6,823,900
1.4800 1.5450 1.4450 1.5000 3,881,700
1.5400 1.6000 1.5000 1.5000 3,726,700
Weekend
Weekend
1.4700 1.5350 1.3300 1.5000 6,637,500

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.

20 424B5 424B5 (opens SEC filing in a new tab) After-hours · 20:51 ET Summarise
19 8-K 8-K (opens SEC filing in a new tab) After-hours · 20:47 ET Summarise
18 8-K 8-K (opens SEC filing in a new tab) After market open · 13:00 ET Summarise
17 8-K 8-K (opens SEC filing in a new tab) After market open · 11:00 ET Summarise
16 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:15 ET Summarise
15 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:10 ET Summarise
14 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:05 ET Summarise
13 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:05 ET Summarise
12 8-K 8-K (opens SEC filing in a new tab) After-hours · 17:15 ET Summarise
11 424B5 424B5 (opens SEC filing in a new tab) After-hours · 17:13 ET Summarise
10 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:17 ET Summarise
9 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:12 ET Summarise
8 DEFA14A DEFA14A (opens SEC filing in a new tab) After-hours · 16:06 ET Summarise
7 DEF 14A DEF 14A (opens SEC filing in a new tab) After-hours · 16:05 ET Summarise
6 S-3 S-3 (opens SEC filing in a new tab) After-hours · 16:08 ET Summarise
5 10-K 10-K (opens SEC filing in a new tab) After-hours · 16:15 ET Summarise
4 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:10 ET Summarise
3 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:10 ET Summarise
2 10-Q 10-Q (opens SEC filing in a new tab) After-hours · 16:17 ET Summarise
1 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:12 ET Summarise