Quick Takeaways
- 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
What Changed
- Buy value: ; sell value: $898,845.
- Net share flow: -530,371.
Why This Matters
- 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.
Source 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 | 129,850 | $0 | $278,596 | -$278,596 |
| 3-6 | 0 | 196,104 | $0 | $219,987 | -$219,987 |
| 6-9 | 0 | 110,952 | $0 | $275,068 | -$275,068 |
| 9-12 | 0 | 93,465 | $0 | $125,195 | -$125,195 |
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 by the holder's primary source 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 |
|---|---|---|---|---|---|---|---|---|
| Polaris Venture Management Co. VI, L.L.C. |
3/4/5
|
10%+ Owner |
—
class O/S missing
|
9,853,817
|
$68,200,238 | — | 29 May 2024 | |
| Terrance McGuire |
3/4/5
|
Director, 10%+ Owner |
—
class O/S missing
|
10,908,813
|
$60,653,001 | — | 11 Sep 2023 | |
| TCG Crossover GP II, LLC |
13D/G
|
Chen Yu |
9.2%
|
10,000,000
|
$29,600,000 | $0 | 22 Oct 2025 | |
| Polaris Venture Partners VI, L.P. |
13D/G
|
Terrance G. McGuire |
6.5%
|
7,095,251
|
$21,001,943 | $0 | 30 Sep 2025 | |
| TCG Crossover Management, LLC |
13F
|
Company |
9%
|
10,000,000
|
$15,600,000 | — | 31 Dec 2025 | |
| Tillman U. Gerngross |
3/4/5
|
Director |
—
mixed-class rows
|
2,656,679
mixed-class rows
|
$14,702,414 | — | 14 Jun 2023 | |
| 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. |
13D/G
13F
|
Company |
5.2%
|
5,784,214
|
$12,436,060 | +$1,299,479 | 31 Mar 2026 | |
| VANGUARD GROUP INC |
13F
|
Company |
6.2%
|
6,908,054
|
$10,776,564 | — | 31 Dec 2025 | |
| FMR LLC |
13D/G
13F
|
Company |
3.6%
|
3,599,820
|
$10,655,467 | $0 | 31 Oct 2025 | |
| Foresite Capital Management IV, LLC |
13F
|
Company |
3.5%
|
3,887,200
|
$6,064,032 | — | 31 Dec 2025 | |
| Merck & Co., Inc. |
13F
|
Company |
3.2%
|
3,545,719
|
$5,531,322 | — | 31 Dec 2025 | |
| ACADIAN ASSET MANAGEMENT LLC |
13F
|
Company |
3.1%
|
3,442,449
|
$5,362,000 | — | 31 Dec 2025 | |
| 683 Capital Management, LLC |
13F
|
Company |
3%
|
3,350,000
|
$5,226,000 | — | 31 Dec 2025 | |
| BALYASNY ASSET MANAGEMENT L.P. |
13F
|
Company |
2.9%
|
3,265,575
|
$5,094,297 | — | 31 Dec 2025 | |
| D. E. Shaw & Co., Inc. |
13F
|
Company |
2.1%
|
2,365,151
|
$3,689,636 | — | 31 Dec 2025 | |
| JACOBS LEVY EQUITY MANAGEMENT, INC |
13F
|
Company |
2%
|
2,173,202
|
$3,390,195 | — | 31 Dec 2025 | |
| Ikarian Capital, LLC |
13F
|
Company |
1.9%
|
2,082,606
|
$3,248,866 | — | 31 Dec 2025 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
1.9%
|
2,075,220
|
$3,238,029 | — | 31 Dec 2025 | |
| Kynam Capital Management, LP |
13F
|
Company |
1.8%
|
2,000,000
|
$3,120,000 | — | 31 Dec 2025 | |
| Robert King |
3/4/5
|
Chief Development Officer |
—
mixed-class rows
|
565,255
mixed-class rows
|
$3,062,843 | — | 01 Oct 2022 | |
| STATE STREET CORP |
13F
|
Company |
1.6%
|
1,814,298
|
$2,830,305 | — | 31 Dec 2025 | |
| RENAISSANCE TECHNOLOGIES LLC |
13F
|
Company |
1.4%
|
1,543,650
|
$2,408,094 | — | 31 Dec 2025 | |
| MEDICI CAPITAL LLC |
13F
|
Company |
1.3%
|
1,500,520
|
$2,340,811 | — | 31 Dec 2025 | |
| MILLENNIUM MANAGEMENT LLC |
13F
|
Company |
1.2%
|
1,332,914
|
$2,079,346 | — | 31 Dec 2025 | |
| Euclidean Capital LLC |
13F
|
Company |
1.2%
|
1,307,858
|
$2,040,258 | — | 31 Dec 2025 | |
| MARSHALL WACE, LLP |
13F
|
Company |
1%
|
1,166,817
|
$1,820,234 | — | 31 Dec 2025 | |
| Spruce Street Capital LP |
13F
|
Company |
1%
|
1,117,986
|
$1,744,058 | — | 31 Dec 2025 | |
| ADAR1 Capital Management, LLC |
13F
|
Company |
1%
|
1,108,000
|
$1,728,480 | — | 31 Dec 2025 | |
| DEERFIELD MANAGEMENT COMPANY, L.P. |
13F
|
Company |
0.95%
|
1,055,192
|
$1,646,100 | — | 31 Dec 2025 | |
| TWO SIGMA INVESTMENTS, LP |
13F
|
Company |
0.93%
|
1,039,656
|
$1,621,863 | — | 31 Dec 2025 | |
| DEUTSCHE BANK AG\ |
13F
|
Company |
0.93%
|
1,035,154
|
$1,614,840 | — | 31 Dec 2025 | |
| Eversept Partners, LP |
13F
|
Company |
0.9%
|
1,006,163
|
$1,569,614 | — | 31 Dec 2025 | |
| JANE STREET GROUP, LLC |
13F
|
Company |
0.89%
|
993,913
|
$1,550,504 | — | 31 Dec 2025 | |
| DAFNA Capital Management LLC |
13F
|
Company |
0.82%
|
908,351
|
$1,417,028 | — | 31 Dec 2025 | |
| Elmind Capital, LP |
13F
|
Company |
0.81%
|
900,000
|
$1,404,000 | — | 31 Dec 2025 | |
| PANAGORA ASSET MANAGEMENT INC |
13F
|
Company |
0.76%
|
850,298
|
$1,326,465 | — | 31 Dec 2025 | |
| Robert Paul |
3/4/5
|
Chief Medical Officer |
—
mixed-class rows
|
318,769
mixed-class rows
|
$1,302,814 | — | 09 Aug 2021 | |
| Vestal Point Capital, LP |
13F
|
Company |
0.68%
|
755,000
|
$1,177,800 | — | 31 Dec 2025 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
|
Company |
0.6%
|
665,491
|
$1,038,166 | — | 31 Dec 2025 | |
| TWO SIGMA ADVISERS, LP |
13F
|
Company |
0.59%
|
651,800
|
$1,016,808 | — | 31 Dec 2025 | |
| MACKENZIE FINANCIAL CORP |
13F
|
Company |
0.59%
|
660,168
|
$1,001,481 | — | 31 Dec 2025 | |
| AQR CAPITAL MANAGEMENT LLC |
13F
|
Company |
0.54%
|
599,569
|
$935,327 | — | 31 Dec 2025 | |
| XTX Topco Ltd |
13F
|
Company |
0.53%
|
592,839
|
$924,829 | — | 31 Dec 2025 | |
| NORTHERN TRUST CORP |
13F
|
Company |
0.53%
|
587,653
|
$916,738 | — | 31 Dec 2025 | |
| BOOTHBAY FUND MANAGEMENT, LLC |
13F
|
Company |
0.5%
|
559,726
|
$873,173 | — | 31 Dec 2025 | |
| Neil Lindsay Berkley |
3/4/5
|
CFO & Chief Business Officer |
—
mixed-class rows
|
594,260
mixed-class rows
|
$782,549 | -$144,225 | 13 Mar 2026 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
0.39%
|
437,959
|
$683,217 | — | 31 Dec 2025 | |
| Deutsche Girozentrale DekaBank |
13F
|
Individual |
0.09%
|
100,000
|
$661,000 | — | 31 Dec 2025 | |
| BARCLAYS PLC |
13F
|
Company |
0.36%
|
398,687
|
$621,952 | — | 31 Dec 2025 |
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 |
| Richard H. Scheller | ALEC | Common Stock | Award | 31.2% | 15,833 | 66,666 | 02 May 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.