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United States Biotechnology & Medical Research

Alector Inc (ALEC)

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Over the last 90 days, Alector Inc. has seen significant insider selling, with a net value of -$221,681.77 and a net of -3 executives selling shares. Notable transactions include sales by CEO Arnon Rosenthal and CFO Neil L. Berkley. The stock has experienced a 23.9% price decrease over the same period.
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Ticker: ALEC Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings
Top insiders
Trades
Wong-Sarad Grace
Principal Accounting Officer
1 sale — total 100,000 USD
Planned sale 3 Jun 2026
Value US$3,200,468.20 | Price 223.95 | Shares 43,769
Proposed sale 3 Jun 2026
Value US$4,616,132.77 | Price 270.92 | Shares 1,935
Sale 2 Jun 2026
Value US$100,000.00 | Price 1.97 | Shares 1,000
Sale 2 Jun 2026
Value US$100,000.00 | Price 1.97 | Shares 1,000
Sale 2 Jun 2026
Value US$100,000.00 | Price 1.97 | Shares 1,000
Proposed sale 2 Jun 2026
Value US$100,000.00 | Price 2.07 | Shares 1,000
Proposed sale 2 Jun 2026
Value US$100,000.00 | Price 2.07 | Shares 1,000
Proposed sale 2 Jun 2026
Value US$100,000.00 | Price 2.07 | Shares 1,000
Planned sale 16 Apr 2026
Value US$4,823.00 | Price 2.65 | Shares 1,820
Proposed sale 16 Apr 2026
Value US$4,823.00 | Price 2.65 | Shares 1,820
Planned sale 10 Mar 2026
Value US$2,650.00 | Price 2.65 | Shares 1,000
Proposed sale 10 Mar 2026
Value US$2,650.00 | Price 2.65 | Shares 1,000
Planned sale 3 Mar 2026
Value US$7,012.11 | Price 2.08 | Shares 3,367
Proposed sale 3 Mar 2026
Value US$7,012.11 | Price 2.08 | Shares 3,367
Sale 2 Mar 2026
Value US$17,137.96 | Price 2.12 | Shares 8,071
Sale 2 Mar 2026
Value US$173,821.83 | Price 2.12 | Shares 81,864
Sale 2 Mar 2026
Value US$62,953.72 | Price 2.12 | Shares 29,649
Proposed sale 2 Mar 2026
Value US$56,281.23 | Price 2.43 | Shares 23,161
Proposed sale 2 Mar 2026
Value US$164,197.53 | Price 2.43 | Shares 67,571
Proposed sale 2 Mar 2026
Value US$15,301.71 | Price 2.43 | Shares 6,297
Planned sale 26 Feb 2026
Value US$10,197.50 | Price 2.50 | Shares 4,079
Proposed sale 26 Feb 2026
Value US$10,197.50 | Price 2.50 | Shares 4,079
Planned sale 5 Dec 2025
Value US$5,751.13 | Price 1.21 | Shares 4,753
Proposed sale 5 Dec 2025
Value US$5,751.13 | Price 1.21 | Shares 4,753
Sale 3 Dec 2025
Value US$46,672.77 | Price 1.12 | Shares 41,687
Sale 3 Dec 2025
Value US$9,018.69 | Price 1.12 | Shares 8,056
Sale 3 Dec 2025
Value US$116,826.90 | Price 1.12 | Shares 104,347
Sale 3 Dec 2025
Value US$41,717.42 | Price 1.12 | Shares 37,261
Proposed sale 1 Dec 2025
Value US$113,685.21 | Price 1.23 | Shares 92,427
Proposed sale 1 Dec 2025
Value US$40,580.16 | Price 1.23 | Shares 32,992
Proposed sale 1 Dec 2025
Value US$8,714.55 | Price 1.23 | Shares 7,085
Proposed sale 1 Dec 2025
Value US$45,404.22 | Price 1.23 | Shares 36,914
Sale 2 Sep 2025
Value US$39,554.31 | Price 2.50 | Shares 15,842
Sale 2 Sep 2025
Value US$14,756.09 | Price 2.50 | Shares 5,910
Sale 2 Sep 2025
Value US$59,019.36 | Price 2.50 | Shares 23,638
Sale 2 Sep 2025
Value US$128,740.00 | Price 2.50 | Shares 51,562
Proposed sale 2 Sep 2025
Value US$36,251.10 | Price 2.35 | Shares 15,426
Proposed sale 2 Sep 2025
Value US$13,434.95 | Price 2.35 | Shares 5,717
Proposed sale 2 Sep 2025
Value US$54,094.65 | Price 2.35 | Shares 23,019
Proposed sale 2 Sep 2025
Value US$118,068.70 | Price 2.35 | Shares 50,242
Planned sale 26 Aug 2025
Value US$32,998.00 | Price 2.36 | Shares 14,000
Proposed sale 26 Aug 2025
Value US$32,996.60 | Price 2.36 | Shares 14,000
Proposed sale 8 Aug 2025
Value US$152,892.00 | Price 2.00 | Shares 76,446
Sale 20 Jun 2025
Value US$1,440.00 | Price 1.44 | Shares 1,000
Sale 2 Jun 2025
Value US$31,974.38 | Price 1.34 | Shares 23,890
Sale 2 Jun 2025
Value US$22,067.54 | Price 1.34 | Shares 16,488
Sale 2 Jun 2025
Value US$69,713.24 | Price 1.34 | Shares 52,087
Proposed sale 2 Jun 2025
Value US$30,616.60 | Price 1.33 | Shares 23,020
Proposed sale 2 Jun 2025
Value US$66,821.86 | Price 1.33 | Shares 50,242
Proposed sale 2 Jun 2025
Value US$21,111.09 | Price 1.33 | Shares 15,873
Sale 3 Mar 2025
Value US$26,546.73 | Price 1.47 | Shares 18,091
Sale 3 Mar 2025
Value US$23,927.42 | Price 1.47 | Shares 16,306
Sale 3 Mar 2025
Value US$59,176.21 | Price 1.47 | Shares 40,330
Sale 3 Mar 2025
Value US$42,661.72 | Price 1.47 | Shares 29,073
Proposed sale 3 Mar 2025
Value US$23,461.84 | Price 1.64 | Shares 14,306
Proposed sale 3 Mar 2025
Value US$82,396.88 | Price 1.64 | Shares 50,242
Proposed sale 3 Mar 2025
Value US$26,031.72 | Price 1.64 | Shares 15,873
Proposed sale 3 Mar 2025
Value US$41,846.24 | Price 1.64 | Shares 25,516
Sale 2 Dec 2024
Value US$41,542.39 | Price 2.52 | Shares 16,489
Sale 2 Dec 2024
Value US$37,518.90 | Price 2.52 | Shares 14,892
Sale 2 Dec 2024
Value US$66,764.10 | Price 2.52 | Shares 26,500
Sale 2 Dec 2024
Value US$131,442.14 | Price 2.52 | Shares 52,172
Proposed sale 2 Dec 2024
Value US$37,052.54 | Price 2.59 | Shares 14,306
Proposed sale 2 Dec 2024
Value US$65,954.35 | Price 2.59 | Shares 25,465
Proposed sale 2 Dec 2024
Value US$41,030.78 | Price 2.59 | Shares 15,842
Proposed sale 2 Dec 2024
Value US$129,867.78 | Price 2.59 | Shares 50,142
Sale 3 Sep 2024
Value US$67,981.16 | Price 4.88 | Shares 13,926
Sale 3 Sep 2024
Value US$129,386.67 | Price 4.88 | Shares 26,499
Sale 3 Sep 2024
Value US$41,385.36 | Price 4.88 | Shares 8,478
Sale 3 Sep 2024
Value US$35,620.31 | Price 4.88 | Shares 7,297
Proposed sale 3 Sep 2024
Value US$128,615.52 | Price 5.28 | Shares 24,359
Proposed sale 3 Sep 2024
Value US$35,391.84 | Price 5.28 | Shares 6,703
Proposed sale 3 Sep 2024
Value US$67,562.88 | Price 5.28 | Shares 12,796
Proposed sale 3 Sep 2024
Value US$41,120.64 | Price 5.28 | Shares 7,788
Sale 22 Aug 2024
Value US$228,387.52 | Price 5.16 | Shares 44,250
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-06-03 2026-06-03 PlS Planned sale
1.9
Wong-Sarad Grace

Principal Accounting Officer

Officer
43,769 -23.1%
223.95
US$3,200,468 		43,769 -23.1% 223.95 US$3,200,468
2026-06-03 2026-06-03 PrS Proposed sale
1.9
GRACE WONG-SARAD

Officer

Officer
1,935
270.92
US$4,616,133 		1,935 270.92 US$4,616,133
2026-06-03 2026-06-02 S Sale
1.9
Wong-Sarad Grace

Principal Accounting Officer

Officer
70,334 +18.7%
487.96
US$2,174,413 		70,334 +18.7% 487.96 US$2,174,413
2026-06-03 2026-06-02 S Sale
3.2
Rosenthal Arnon

Chief Executive Officer

Executive Director
1,000 -3.6%
1.97
US$100,000 		1,000 -3.6% 1.97 US$100,000
2026-06-03 2026-06-02 S Sale
1.7
Berkley Neil Lindsay

CFO & Chief Business Officer

Officer
1,000 -4.8%
1.97
US$100,000 		1,000 -4.8% 1.97 US$100,000
2026-06-01 2026-06-02 PrS Proposed sale
1.9
Grace Wong-Sarad

Officer

Officer
1,000
2.07
US$100,000 		1,000 2.07 US$100,000
2026-06-01 2026-06-02 PrS Proposed sale
1.7
Neil L. Berkley

Officer

Officer
1,000
2.07
US$100,000 		1,000 2.07 US$100,000
2026-06-01 2026-06-02 PrS Proposed sale
3.2
Arnon Rosenthal

Officer; Director

Executive Director
1,000
2.07
US$100,000 		1,000 2.07 US$100,000
2026-04-17 2026-04-16 PlS Planned sale
1.9
Wong-Sarad Grace

Principal Accounting Officer

Officer
1,820 -1.7%
2.65
US$4,823 		1,820 -1.7% 2.65 US$4,823
2026-04-16 2026-04-16 PrS Proposed sale
1.9
GRACE WONG-SARAD

Officer

Officer
1,820
2.65
US$4,823 		1,820 2.65 US$4,823
2026-03-12 2026-03-10 PlS Planned sale
1.9
Wong-Sarad Grace

Principal Accounting Officer

Officer
1,000 -0.9%
2.65
US$2,650 		1,000 -0.9% 2.65 US$2,650
2026-03-10 2026-03-10 PrS Proposed sale
1.9
GRACE WONG-SARAD

Officer

Officer
1,000
2.65
US$2,650 		1,000 2.65 US$2,650
2026-03-03 2026-03-03 PlS Planned sale
1.9
Wong-Sarad Grace

Principal Accounting Officer

Officer
3,367 -3.0%
2.08
US$7,012 		3,367 -3.0% 2.08 US$7,012
2026-03-03 2026-03-03 PrS Proposed sale
1.9
GRACE WONG-SARAD

Officer

Officer
3,367
2.08
US$7,012 		3,367 2.08 US$7,012
2026-03-03 2026-03-02 S Sale
1.9
Wong-Sarad Grace

Principal Accounting Officer

Officer
8,071 -6.8%
2.12
US$17,138 		8,071 -6.8% 2.12 US$17,138
2026-03-03 2026-03-02 S Sale
3.2
Rosenthal Arnon

Chief Executive Officer

Executive Director
81,864 -3.4%
2.12
US$173,822 		81,864 -3.4% 2.12 US$173,822
2026-03-03 2026-03-02 S Sale
1.7
Berkley Neil Lindsay

CFO & Chief Business Officer

Officer
29,649 -7.9%
2.12
US$62,954 		29,649 -7.9% 2.12 US$62,954
2026-02-27 2026-03-02 PrS Proposed sale
1.7
Neil L. Berkley

Officer

Officer
23,161
2.43
US$56,281 		23,161 2.43 US$56,281
2026-02-27 2026-03-02 PrS Proposed sale
3.2
Arnon Rosenthal

Officer; Director

Executive Director
67,571
2.43
US$164,198 		67,571 2.43 US$164,198
2026-02-27 2026-03-02 PrS Proposed sale
1.9
Grace Wong-Sarad

Officer

Officer
6,297
2.43
US$15,302 		6,297 2.43 US$15,302
2026-02-26 2026-02-26 PlS Planned sale
1.9
Wong-Sarad Grace

Principal Accounting Officer

Officer
4,079 -3.3%
2.50
US$10,198 		4,079 -3.3% 2.50 US$10,198
2026-02-26 2026-02-26 PrS Proposed sale
1.9
GRACE WONG-SARAD

Officer

Officer
4,079
2.50
US$10,198 		4,079 2.50 US$10,198
2025-12-08 2025-12-05 PlS Planned sale
1.9
Wong-Sarad Grace

Principal Accounting Officer

Officer
4,753 -3.7%
1.21
US$5,751 		4,753 -3.7% 1.21 US$5,751
2025-12-05 2025-12-05 PrS Proposed sale
1.9
GRACE WONG-SARAD

Officer

Officer
4,753
1.21
US$5,751 		4,753 1.21 US$5,751
2025-12-03 2025-12-03 S Sale
3.6
Kenkare-Mitra Sara

President and Head of R&D

Officer
41,687 -7.7%
1.12
US$46,673 		41,687 -7.7% 1.12 US$46,673
2025-12-03 2025-12-03 S Sale
1.9
Wong-Sarad Grace

Principal Accounting Officer

Officer
8,056 -5.9%
1.12
US$9,019 		8,056 -5.9% 1.12 US$9,019
2025-12-03 2025-12-03 S Sale
3.2
Rosenthal Arnon

Chief Executive Officer

Executive Director
104,347 -4.1%
1.12
US$116,827 		104,347 -4.1% 1.12 US$116,827
2025-12-03 2025-12-03 S Sale
1.7
Berkley Neil Lindsay

Chief Bus Ofcr & Interim CFO

Officer
37,261 -9.1%
1.12
US$41,717 		37,261 -9.1% 1.12 US$41,717
2025-12-01 2025-12-01 PrS Proposed sale
3.2
Arnon Rosenthal

Officer; Director

Executive Director
92,427
1.23
US$113,685 		92,427 1.23 US$113,685
2025-12-01 2025-12-01 PrS Proposed sale
1.7
Neil L. Berkley

Officer

Officer
32,992
1.23
US$40,580 		32,992 1.23 US$40,580
2025-12-01 2025-12-01 PrS Proposed sale
1.9
Grace Wong-Sarad

Officer

Officer
7,085
1.23
US$8,715 		7,085 1.23 US$8,715
2025-12-01 2025-12-01 PrS Proposed sale
3.6
Sara Kenkare-Mitra

Officer

Officer
36,914
1.23
US$45,404 		36,914 1.23 US$45,404
2025-09-04 2025-09-02 S Sale
1.7
Berkley Neil Lindsay

Principal Financial Officer

Officer
15,842 -4.4%
2.50
US$39,554 		15,842 -4.4% 2.50 US$39,554
2025-09-04 2025-09-02 S Sale
1.9
Wong-Sarad Grace

Principal Accounting Officer

Officer
5,910 -5.4%
2.50
US$14,756 		5,910 -5.4% 2.50 US$14,756
2025-09-04 2025-09-02 S Sale
3.6
Kenkare-Mitra Sara

President and Head of R&D

Officer
23,638 -4.2%
2.50
US$59,019 		23,638 -4.2% 2.50 US$59,019
2025-09-04 2025-09-02 S Sale
3.2
Rosenthal Arnon

Chief Executive Officer

Executive Director
51,562 -2.1%
2.50
US$128,740 		51,562 -2.1% 2.50 US$128,740
2025-08-29 2025-09-02 PrS Proposed sale
1.7
Neil L. Berkley

Officer

Officer
15,426
2.35
US$36,251 		15,426 2.35 US$36,251
2025-08-29 2025-09-02 PrS Proposed sale
1.9
Grace Wong-Sarad

Officer

Officer
5,717
2.35
US$13,435 		5,717 2.35 US$13,435
2025-08-29 2025-09-02 PrS Proposed sale
3.6
Sara Kenkare-Mitra

Officer

Officer
23,019
2.35
US$54,095 		23,019 2.35 US$54,095
2025-08-29 2025-09-02 PrS Proposed sale
3.2
Arnon Rosenthal

Officer; Director

Executive Director
50,242
2.35
US$118,069 		50,242 2.35 US$118,069
2025-08-27 2025-08-26 PlS Planned sale
Hammond Paula
Non-Executive Director
14,000 -15.7%
2.36
US$32,998 		14,000 -15.7% 2.36 US$32,998
2025-08-26 2025-08-26 PrS Proposed sale
PAULA HAMMOND

Director

Non-Executive Director
14,000
2.36
US$32,997 		14,000 2.36 US$32,997
2025-08-08 2025-08-08 PrS Proposed sale
3.9
MARC GRASSO

Officer

Officer
76,446
2.00
US$152,892 		76,446 2.00 US$152,892
2025-06-23 2025-06-20 S Sale
0.5
Yaffe Kristine
Non-Executive Director
1,000 -1.0%
1.44
US$1,440 		1,000 -1.0% 1.44 US$1,440
2025-06-04 2025-06-02 S Sale
3.6
Kenkare-Mitra Sara

President and Head of R&D

Officer
23,890 -4.5%
1.34
US$31,974 		23,890 -4.5% 1.34 US$31,974
2025-06-04 2025-06-02 S Sale
3.9
GRASSO MARC

Chief Financial Officer

Officer
16,488 -5.3%
1.34
US$22,068 		16,488 -5.3% 1.34 US$22,068
2025-06-04 2025-06-02 S Sale
3.2
Rosenthal Arnon

Chief Executive Officer

Executive Director
52,087 -2.1%
1.34
US$69,713 		52,087 -2.1% 1.34 US$69,713
2025-05-30 2025-06-02 PrS Proposed sale
3.6
Sara Kenkare-Mitra

Officer

Officer
23,020
1.33
US$30,617 		23,020 1.33 US$30,617
2025-05-30 2025-06-02 PrS Proposed sale
3.2
Arnon Rosenthal

Officer; Director

Executive Director
50,242
1.33
US$66,822 		50,242 1.33 US$66,822
2025-05-30 2025-06-02 PrS Proposed sale
3.9
Marc Grasso

Officer

Officer
15,873
1.33
US$21,111 		15,873 1.33 US$21,111
2025-03-05 2025-03-03 S Sale
3.9
GRASSO MARC

Chief Financial Officer

Officer
18,091 -5.5%
1.47
US$26,547 		18,091 -5.5% 1.47 US$26,547
2025-03-05 2025-03-03 S Sale
4.1
Romano Gary

Chief Medical Officer

Officer
16,306 -4.7%
1.47
US$23,927 		16,306 -4.7% 1.47 US$23,927
2025-03-05 2025-03-03 S Sale
3.2
Rosenthal Arnon

Chief Executive Officer

Executive Director
40,330 -1.6%
1.47
US$59,176 		40,330 -1.6% 1.47 US$59,176
2025-03-05 2025-03-03 S Sale
3.6
Kenkare-Mitra Sara

President and Head of R&D

Officer
29,073 -5.1%
1.47
US$42,662 		29,073 -5.1% 1.47 US$42,662
2025-02-28 2025-03-03 PrS Proposed sale
4.1
Gary Romano

Officer

Officer
14,306
1.64
US$23,462 		14,306 1.64 US$23,462
2025-02-28 2025-03-03 PrS Proposed sale
3.2
Arnon Rosenthal

Officer; Director

Executive Director
50,242
1.64
US$82,397 		50,242 1.64 US$82,397
2025-02-28 2025-03-03 PrS Proposed sale
3.9
Marc Grasso

Officer

Officer
15,873
1.64
US$26,032 		15,873 1.64 US$26,032
2025-02-28 2025-03-03 PrS Proposed sale
3.6
Sara Kenkare-Mitra

Officer

Officer
25,516
1.64
US$41,846 		25,516 1.64 US$41,846
2024-12-03 2024-12-02 S Sale
3.9
GRASSO MARC

Chief Financial Officer

Officer
16,489 -4.7%
2.52
US$41,542 		16,489 -4.7% 2.52 US$41,542
2024-12-03 2024-12-02 S Sale
4.1
Romano Gary

Chief Medical Officer

Officer
14,892 -4.1%
2.52
US$37,519 		14,892 -4.1% 2.52 US$37,519
2024-12-03 2024-12-02 S Sale
3.6
Kenkare-Mitra Sara

President and Head of R&D

Officer
26,500 -4.5%
2.52
US$66,764 		26,500 -4.5% 2.52 US$66,764
2024-12-03 2024-12-02 S Sale
3.2
Rosenthal Arnon

Chief Executive Officer

Executive Director
52,172 -2.0%
2.52
US$131,442 		52,172 -2.0% 2.52 US$131,442
2024-11-29 2024-12-02 PrS Proposed sale
4.1
Gary Romano

Officer

Officer
14,306
2.59
US$37,053 		14,306 2.59 US$37,053
2024-11-29 2024-12-02 PrS Proposed sale
3.6
Sara Kenkare-Mitra

Officer

Officer
25,465
2.59
US$65,954 		25,465 2.59 US$65,954
2024-11-29 2024-12-02 PrS Proposed sale
3.9
Marc Grasso

Officer

Officer
15,842
2.59
US$41,031 		15,842 2.59 US$41,031
2024-11-29 2024-12-02 PrS Proposed sale
3.2
Arnon Rosenthal

Officer; Director

Executive Director
50,142
2.59
US$129,868 		50,142 2.59 US$129,868
2024-09-04 2024-09-03 S Sale
3.6
Kenkare-Mitra Sara

President and Head of R&D

Officer
13,926 -4.6%
4.88
US$67,981 		13,926 -4.6% 4.88 US$67,981
2024-09-04 2024-09-03 S Sale
3.2
Rosenthal Arnon

Chief Executive Officer

Executive Director
26,499 -1.3%
4.88
US$129,387 		26,499 -1.3% 4.88 US$129,387
2024-09-04 2024-09-03 S Sale
4.1
Romano Gary

Chief Medical Officer

Officer
8,478 -4.5%
4.88
US$41,385 		8,478 -4.5% 4.88 US$41,385
2024-09-04 2024-09-03 S Sale
3.9
GRASSO MARC

Chief Financial Officer

Officer
7,297 -5.3%
4.88
US$35,620 		7,297 -5.3% 4.88 US$35,620
2024-08-30 2024-09-03 PrS Proposed sale
3.2
Arnon Rosenthal

Officer; Director

Executive Director
24,359
5.28
US$128,616 		24,359 5.28 US$128,616
2024-08-30 2024-09-03 PrS Proposed sale
3.9
Marc Grasso

Officer

Officer
6,703
5.28
US$35,392 		6,703 5.28 US$35,392
2024-08-30 2024-09-03 PrS Proposed sale
3.6
Sara Kenkare-Mitra

Officer

Officer
12,796
5.28
US$67,563 		12,796 5.28 US$67,563
2024-08-30 2024-09-03 PrS Proposed sale
4.1
Gary Romano

Officer

Officer
7,788
5.28
US$41,121 		7,788 5.28 US$41,121
2024-08-23 2024-08-22 S Sale
2.4
SCHELLER RICHARD H
Non-Executive Director
44,250 -55.8%
5.16
US$228,388 		44,250 -55.8% 5.16 US$228,388
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