Key facts
- ALEC - Alector, Inc. has 22 insiders with reported activity on this page.
- Net insider value flow over the last year: -$898,846.
- Recent transaction rows are available for direct filing-level review.
Insider Transactions Reported by 22 Insiders of Alector, Inc.
- Symbol
- ALEC on Nasdaq
- Location
- South San Francisco, CA
Change
- Buy value: ; sell value: $898,845.
- Net share flow: -530,371.
Research use
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Evidence
Filed on Form 4
See Original Filing
Issuer insider activity is sourced from SEC Forms 3, 4, and 5.
Insider trading overview
Last 12 monthsNet insider flow leans to selling over the last 12 months. Net value: -$898,846.
Buys
$0
Shares: 0
Insiders: 0
Sells
$898,846
Shares: 530,371
Insiders: 7
Net
-$898,846
Shares: -530,371
Insiders: -7
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 125,771 | $0 | $268,399 | -$268,399 |
| 3-6 | 0 | 200,183 | $0 | $230,184 | -$230,184 |
| 6-9 | 0 | 96,952 | $0 | $242,070 | -$242,070 |
| 9-12 | 0 | 107,465 | $0 | $158,193 | -$158,193 |
Alector, Inc. executives and other stock owners filed with the SEC include:
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Polaris Venture Management Co. VI, L.L.C. | 10%+ Owner | $68,200,238 | Mixed | 29 May 2024 | ||
| Terrance McGuire | Director, 10%+ Owner | $60,653,001 | Mixed | 11 Sep 2023 | ||
| Tillman U. Gerngross | Director | $14,702,414 | Mixed | 14 Jun 2023 | ||
| Arnon Rosenthal | Chief Executive Officer, Director | $6,089,567 | -$489,102 | -7.4% | Mixed | 13 Mar 2026 |
| Robert King | Chief Development Officer | $3,062,843 | Mixed | 01 Oct 2022 | ||
| Robert Paul | Chief Medical Officer | $1,302,814 | Mixed | 09 Aug 2021 | ||
| Neil Lindsay Berkley | CFO & Chief Business Officer | $782,549 | -$144,225 | -16% | Mixed | 13 Mar 2026 |
| Shehnaaz Suliman | President and COO | $570,445 | Mixed | 10 Dec 2021 | ||
| Sara Kenkare-Mitra | President and Head of R&D | $561,649 | -$137,666 | -20% | Filing P/S | 03 Dec 2025 |
| David M. Wehner | Director | $553,434 | Mixed | 12 Jun 2024 | ||
| Gary Romano | Chief Medical Officer | $488,610 | Filing P/S | 03 Mar 2025 | ||
| Calvin Yu | Vice President, Finance | $426,374 | Mixed | 02 Jul 2021 | ||
| Marc Grasso | Chief Financial Officer | $396,262 | -$22,068 | -5.3% | Filing P/S | 02 Jun 2025 |
| Grace Wong-Sarad | Principal Accounting Officer | $277,309 | -$71,346 | -20% | Filing P/S | 16 Apr 2026 |
| Paula Hammond | Director | $176,560 | -$32,998 | -16% | Filing P/S | 26 Aug 2025 |
| Kristine Yaffe | Director | $137,388 | -$1,440 | -1% | Filing P/S | 20 Jun 2025 |
| Louis J. Lavigne Jr. | Director | $127,554 | Mixed | 11 Jun 2025 | ||
| Richard H. Scheller | Director | $110,624 | Mixed | 11 Jun 2025 | ||
| Elizabeth A. Garofalo | Director | $104,342 | Mixed | 11 Jun 2025 | ||
| Mark Altmeyer | Director | $81,142 | Mixed | 11 Jun 2025 | ||
| Errol B. Desouza | Director | $81,142 | Mixed | 11 Jun 2025 | ||
| Linda M. Rubinstein | Interim Chief Financial Ofcr | Mixed | 08 Sep 2021 |
Top shareholders of Alector, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| TCG Crossover GP II, LLC |
13D/G
|
Chen Yu |
9.2%
|
10,000,000
|
$29,600,000 | $0 | 22 Oct 2025 | |
| Arnon Rosenthal |
13D/G
3/4/5
|
Chief Executive Officer, Director |
7.4%
|
8,213,925
|
$12,813,723 | $0 | 31 Dec 2025 | |
| BlackRock, Inc. |
13F
13D/G
|
Company |
5.2%
from 13D/G
|
7,741,245
|
$16,643,677 | — | 31 Mar 2026 | |
| Polaris Venture Partners VI, L.P. |
13D/G
|
Terrance G. McGuire |
4.7%
|
5,173,499
|
$12,157,723 | -$4,516,117 | 31 Mar 2026 | |
| FMR LLC |
13D/G
13F
|
Company |
3.6%
|
3,599,820
|
$10,655,467 | $0 | 31 Oct 2025 | |
| Marc Grasso |
3/4/5
|
Chief Financial Officer |
0.27%
|
296,072
|
$396,262 | -$22,068 | 02 Jun 2025 | |
| TCG Crossover Management, LLC |
13F
|
Company |
9.1%
|
10,000,000
|
$21,500,000 | — | 31 Mar 2026 | |
| ACADIAN ASSET MANAGEMENT LLC |
13F
|
Company |
3.7%
|
4,038,785
|
$8,675,000 | — | 31 Mar 2026 | |
| Foresite Capital Management IV, LLC |
13F
|
Company |
3.5%
|
3,887,200
|
$8,357,480 | — | 31 Mar 2026 | |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
|
Company |
3.3%
|
3,678,722
|
$7,909,252 | — | 31 Mar 2026 | |
| Merck & Co., Inc. |
13F
|
Company |
3.2%
|
3,545,719
|
$7,623,297 | — | 31 Mar 2026 | |
| D. E. Shaw & Co., Inc. |
13F
|
Company |
3%
|
3,332,835
|
$7,165,596 | — | 31 Mar 2026 | |
| 683 Capital Management, LLC |
13F
|
Company |
2.9%
|
3,200,000
|
$6,880,000 | — | 31 Mar 2026 | |
| BALYASNY ASSET MANAGEMENT L.P. |
13F
|
Company |
2.7%
|
2,935,253
|
$6,310,794 | — | 31 Mar 2026 | |
| Nantahala Capital Management, LLC |
13F
|
Company |
2.6%
|
2,815,983
|
$6,054,363 | — | 31 Mar 2026 | |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
|
Company |
2.3%
|
2,583,542
|
$5,554,615 | — | 31 Mar 2026 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
2.1%
|
2,286,218
|
$4,916,361 | — | 31 Mar 2026 | |
| JACOBS LEVY EQUITY MANAGEMENT, INC |
13F
|
Company |
2%
|
2,154,361
|
$4,631,876 | — | 31 Mar 2026 | |
| Spruce Street Capital LP |
13F
|
Company |
1.9%
|
2,101,068
|
$4,517,296 | — | 31 Mar 2026 | |
| Ikarian Capital, LLC |
13F
|
Company |
1.9%
|
2,082,606
|
$4,477,603 | — | 31 Mar 2026 | |
| Kynam Capital Management, LP |
13F
|
Company |
1.8%
|
2,000,000
|
$4,300,000 | — | 31 Mar 2026 | |
| MILLENNIUM MANAGEMENT LLC |
13F
|
Company |
1.8%
|
1,979,226
|
$4,255,336 | — | 31 Mar 2026 | |
| STATE STREET CORP |
13F
|
Company |
1.7%
|
1,865,526
|
$4,010,881 | — | 31 Mar 2026 | |
| MEDICI CAPITAL LLC |
13F
|
Company |
1.5%
|
1,652,520
|
$3,552,918 | — | 31 Mar 2026 | |
| Eversept Partners, LP |
13F
|
Company |
1.2%
|
1,351,106
|
$2,904,878 | — | 31 Mar 2026 | |
| Euclidean Capital LLC |
13F
|
Company |
1.2%
|
1,307,858
|
$2,811,895 | — | 31 Mar 2026 | |
| RENAISSANCE TECHNOLOGIES LLC |
13F
|
Company |
1.2%
|
1,287,691
|
$2,768,536 | — | 31 Mar 2026 | |
| TWO SIGMA INVESTMENTS, LP |
13F
|
Company |
1.2%
|
1,279,306
|
$2,750,508 | — | 31 Mar 2026 | |
| DEUTSCHE BANK AG\ |
13F
|
Company |
0.99%
|
1,092,903
|
$2,349,741 | — | 31 Mar 2026 | |
| DEERFIELD MANAGEMENT COMPANY, L.P. |
13F
|
Company |
0.96%
|
1,055,192
|
$2,268,663 | — | 31 Mar 2026 | |
| ADAR1 Capital Management, LLC |
13F
|
Company |
0.95%
|
1,050,000
|
$2,257,500 | — | 31 Mar 2026 | |
| DAFNA Capital Management LLC |
13F
|
Company |
0.83%
|
908,351
|
$1,952,955 | — | 31 Mar 2026 | |
| Elmind Capital, LP |
13F
|
Company |
0.82%
|
900,000
|
$1,935,000 | — | 31 Mar 2026 | |
| MACKENZIE FINANCIAL CORP |
13F
|
Company |
0.78%
|
857,354
|
$1,843,311 | — | 31 Mar 2026 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
|
Company |
0.72%
|
787,408
|
$1,692,927 | — | 31 Mar 2026 | |
| AQR CAPITAL MANAGEMENT LLC |
13F
|
Company |
0.65%
|
711,334
|
$1,529,368 | — | 31 Mar 2026 | |
| NORTHERN TRUST CORP |
13F
|
Company |
0.63%
|
692,256
|
$1,488,351 | — | 31 Mar 2026 | |
| MARSHALL WACE, LLP |
13F
|
Company |
0.56%
|
620,424
|
$1,333,914 | — | 31 Mar 2026 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
0.55%
|
604,562
|
$1,299,809 | — | 31 Mar 2026 | |
| PANAGORA ASSET MANAGEMENT INC |
13F
|
Company |
0.54%
|
590,388
|
$1,269,334 | — | 31 Mar 2026 | |
| VANGUARD FIDUCIARY TRUST CO |
13F
|
Company |
0.53%
|
577,939
|
$1,242,569 | — | 31 Mar 2026 | |
| XTX Topco Ltd |
13F
|
Company |
0.51%
|
559,896
|
$1,203,776 | — | 31 Mar 2026 | |
| BOOTHBAY FUND MANAGEMENT, LLC |
13F
|
Company |
0.51%
|
559,726
|
$1,203,411 | — | 31 Mar 2026 | |
| Affinity Asset Advisors, LLC |
13F
|
Company |
0.45%
|
500,000
|
$1,075,000 | — | 31 Mar 2026 | |
| JANE STREET GROUP, LLC |
13F
|
Company |
0.36%
|
399,464
|
$858,848 | — | 31 Mar 2026 | |
| BANK OF AMERICA CORP /DE/ |
13F
|
Company |
0.35%
|
380,908
|
$818,951 | — | 31 Mar 2026 | |
| MORGAN STANLEY |
13F
|
Company |
0.33%
|
364,567
|
$783,821 | — | 31 Mar 2026 | |
| DIMENSIONAL FUND ADVISORS LP |
13F
|
Company |
0.26%
|
283,817
|
$609,754 | — | 31 Mar 2026 | |
| AMERIPRISE FINANCIAL INC |
13F
|
Company |
0.25%
|
271,272
|
$583,234 | — | 31 Mar 2026 | |
| Invesco Ltd. |
13F
|
Company |
0.24%
|
265,067
|
$569,893 | — | 31 Mar 2026 |
Recent Insider Transactions by Companies or Individuals for Alector, Inc.
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Grace Wong-Sarad | ALEC | Common Stock | Sale | -1.71% | $4,823 | $2.65 | -1,820 | 104,645 | 16 Apr 2026 | Direct |
| Neil Lindsay Berkley | ALEC | Common Stock | Award | 15.8% | 54,600 | 399,260 | 15 Mar 2026 | Direct | ||
| Arnon Rosenthal | ALEC | Common Stock | Award | 4.97% | 116,246 | 2,454,422 | 13 Mar 2026 | Direct | ||
| Grace Wong-Sarad | ALEC | Common Stock | Sale | -0.93% | $2,650 | $2.65 | -1,000 | 106,465 | 10 Mar 2026 | Direct |
| Grace Wong-Sarad | ALEC | Common Stock | Sale | -3.04% | $7,012 | $2.08 | -3,367 | 107,465 | 03 Mar 2026 | Direct |
| Grace Wong-Sarad | ALEC | Common Stock | Sale | -6.79% | $17,138 | $2.12 | -8,071 | 110,832 | 02 Mar 2026 | Direct |
| Arnon Rosenthal | ALEC | Common Stock | Sale | -3.38% | $173,822 | $2.12 | -81,864 | 2,338,176 | 02 Mar 2026 | Direct |
| Neil Lindsay Berkley | ALEC | Common Stock | Sale | -7.92% | $62,954 | $2.12 | -29,649 | 344,660 | 02 Mar 2026 | Direct |
| Grace Wong-Sarad | ALEC | Common Stock | Sale | -3.32% | $10,198 | $2.50 | -4,079 | 118,903 | 26 Feb 2026 | Direct |
| Grace Wong-Sarad | ALEC | Common Stock | Sale | -3.72% | $5,751 | $1.21 | -4,753 | 122,982 | 05 Dec 2025 | Direct |
| Grace Wong-Sarad | ALEC | Common Stock | Sale | -5.93% | $9,019 | $1.12 | -8,056 | 127,735 | 03 Dec 2025 | Direct |
| Arnon Rosenthal | ALEC | Common Stock | Sale | -4.13% | $116,827 | $1.12 | -104,347 | 2,420,040 | 03 Dec 2025 | Direct |
| Sara Kenkare-Mitra | ALEC | Common Stock | Sale | -7.67% | $46,673 | $1.12 | -41,687 | 501,652 | 03 Dec 2025 | Direct |
| Neil Lindsay Berkley | ALEC | Common Stock | Sale | -9.05% | $41,717 | $1.12 | -37,261 | 374,309 | 03 Dec 2025 | Direct |
| Neil Lindsay Berkley | ALEC | Common Stock | Award | 18.8% | 65,000 | 411,570 | 10 Nov 2025 | Direct | ||
| Neil Lindsay Berkley | ALEC | Employee Stock Option (right to buy) | Award | 195,000 | 195,000 | 10 Nov 2025 | Direct | |||
| Grace Wong-Sarad | ALEC | Common Stock | Award | 31.3% | 32,343 | 135,791 | 10 Nov 2025 | Direct | ||
| Grace Wong-Sarad | ALEC | Employee Stock Option (right to buy) | Award | 48,535 | 48,535 | 10 Nov 2025 | Direct | |||
| Arnon Rosenthal | ALEC | Common Stock | Award | 7.41% | 174,167 | 2,524,387 | 10 Nov 2025 | Direct | ||
| Arnon Rosenthal | ALEC | Employee Stock Option (right to buy) | Award | 522,500 | 522,500 | 10 Nov 2025 | Direct | |||
| Grace Wong-Sarad | ALEC | Common Stock | Sale | -5.4% | $14,756 | $2.50 | -5,910 | 103,448 | 02 Sep 2025 | Direct |
| Neil Lindsay Berkley | ALEC | Common Stock | Sale | -4.37% | $39,554 | $2.50 | -15,842 | 346,570 | 02 Sep 2025 | Direct |
| Sara Kenkare-Mitra | ALEC | Common Stock | Sale | -4.17% | $59,019 | $2.50 | -23,638 | 543,339 | 02 Sep 2025 | Direct |
| Arnon Rosenthal | ALEC | Common Stock | Sale | -2.15% | $128,740 | $2.50 | -51,562 | 2,350,220 | 02 Sep 2025 | Direct |
| Paula Hammond | ALEC | Common Stock | Sale | -15.8% | $32,998 | $2.36 | -14,000 | 74,909 | 26 Aug 2025 | Direct |
| Neil Lindsay Berkley | ALEC | Employee Stock Option (right to buy) | Award | 18,000 | 18,000 | 01 Jul 2025 | Direct | |||
| Sara Kenkare-Mitra | ALEC | Common Stock | Award | 10.7% | 54,725 | 566,977 | 01 Jul 2025 | Direct | ||
| Sara Kenkare-Mitra | ALEC | Employee Stock Option (right to buy) | Award | 18,250 | 18,250 | 01 Jul 2025 | Direct | |||
| Arnon Rosenthal | ALEC | Common Stock | Award | 5.68% | 137,125 | 2,551,782 | 01 Jul 2025 | Direct | ||
| Arnon Rosenthal | ALEC | Employee Stock Option (right to buy) | Award | 45,700 | 45,700 | 01 Jul 2025 | Direct | |||
| Kristine Yaffe | ALEC | Common Stock | Sale | -1.04% | $1,440 | $1.44 | -1,000 | 95,409 | 20 Jun 2025 | Direct |
| Paula Hammond | ALEC | Common Stock | Award | 47.7% | 28,700 | 88,909 | 11 Jun 2025 | Direct | ||
| Paula Hammond | ALEC | Stock Option (right to buy) | Award | 9,450 | 9,450 | 11 Jun 2025 | Direct | |||
| Kristine Yaffe | ALEC | Common Stock | Award | 42.4% | 28,700 | 96,409 | 11 Jun 2025 | Direct | ||
| Kristine Yaffe | ALEC | Stock Option (right to buy) | Award | 9,450 | 9,450 | 11 Jun 2025 | Direct | |||
| Elizabeth A. Garofalo | ALEC | Common Stock | Award | 46.9% | 28,700 | 89,950 | 11 Jun 2025 | Direct | ||
| Elizabeth A. Garofalo | ALEC | Stock Option (right to buy) | Award | 9,450 | 9,450 | 11 Jun 2025 | Direct | |||
| Richard H. Scheller | ALEC | Common Stock | Award | 43% | 28,700 | 95,366 | 11 Jun 2025 | Direct | ||
| Richard H. Scheller | ALEC | Stock Option (right to buy) | Award | 9,450 | 9,450 | 11 Jun 2025 | Direct | |||
| Louis J. Lavigne Jr. | ALEC | Common Stock | Award | 40.6% | 28,700 | 99,409 | 11 Jun 2025 | Direct | ||
| Louis J. Lavigne Jr. | ALEC | Stock Option (right to buy) | Award | 9,450 | 9,450 | 11 Jun 2025 | Direct | |||
| Errol B. Desouza | ALEC | Common Stock | Award | 69.6% | 28,700 | 69,950 | 11 Jun 2025 | Direct | ||
| Errol B. Desouza | ALEC | Stock Option (right to buy) | Award | 9,450 | 9,450 | 11 Jun 2025 | Direct | |||
| Mark Altmeyer | ALEC | Common Stock | Award | 69.6% | 28,700 | 69,950 | 11 Jun 2025 | Direct | ||
| Mark Altmeyer | ALEC | Stock Option (right to buy) | Award | 9,450 | 9,450 | 11 Jun 2025 | Direct | |||
| Marc Grasso | ALEC | Common Stock | Sale | -5.28% | $22,068 | $1.34 | -16,488 | 296,072 | 02 Jun 2025 | Direct |
| Sara Kenkare-Mitra | ALEC | Common Stock | Sale | -4.46% | $31,974 | $1.34 | -23,890 | 512,252 | 02 Jun 2025 | Direct |
| Arnon Rosenthal | ALEC | Common Stock | Sale | -2.11% | $69,713 | $1.34 | -52,087 | 2,414,657 | 02 Jun 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.