Alector, Inc. (ALEC) has 20 known insider and institutional holders on record. The largest holder is MCGUIRE TERRANCE with 10,853,817 shares. Other notable holders include Polaris Venture Management Co. VI, L.L.C. and Rosenthal Arnon.
Over the last 12 months, insiders have made 38 transactions in ALEC stock — 16 buys (valued at $1.23M) and 20 sells (valued at $894.02K). Insider selling has exceeded buying during this period.
ALEC Insider Ownership
Top Holder
MCGUIRE TERRANCE
10,853,817 shares
Buys (12 mo)
16
$1.23M value
Sells (12 mo)
20
$894.02K value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Mcguire Terrance |
10 Percent Owner |
10,853,817 |
2023-09-13 |
|
| 2 |
Polaris Venture Management Co. Vi, L.l.c. |
10 Percent Owner |
10,853,817 |
2023-09-13 |
|
| 3 |
Rosenthal Arnon |
Chief Executive Officer |
2,454,422 |
2026-03-13 |
|
| 4 |
Orbimed Advisors Llc |
10 Percent Owner |
1,921,804 |
2020-04-16 |
|
| 5 |
Kenkare-mitra Sara |
President and Head of R&d |
501,652 |
2025-12-03 |
|
| 6 |
Berkley Neil Lindsay |
CFO & Chief Business Officer |
399,260 |
2026-03-13 |
|
| 7 |
Romano Gary |
Chief Medical Officer |
332,977 |
2025-03-05 |
|
| 8 |
Grasso Marc |
Chief Financial Officer |
296,072 |
2025-06-04 |
|
| 9 |
Wehner David M. |
Director |
115,330 |
2024-06-12 |
|
| 10 |
Oney Sabah |
Chief Business Officer |
109,689 |
2020-10-05 |
|
| 11 |
Wong-sarad Grace |
Principal Accounting Officer |
106,465 |
2026-03-12 |
|
| 12 |
Suliman Shehnaaz |
President and COO |
102,598 |
2021-12-14 |
|
| 13 |
Yaffe Kristine |
Director |
95,409 |
2025-06-23 |
|
| 14 |
Hammond Paula |
Director |
74,909 |
2025-08-27 |
|
| 15 |
Paul Robert |
Chief Medical Officer |
31,250 |
2021-08-11 |
|
| 16 |
Gordon Carl L |
10 Percent Owner |
20,000 |
2019-05-14 |
|
| 17 |
King Robert |
Chief Development Officer |
14,384 |
2022-10-04 |
|
| 18 |
Gerngross Tillman U. |
Director |
12,360 |
2023-06-15 |
|
| 19 |
Yu Calvin |
Vice President, Finance |
10,625 |
2021-07-07 |
|
| 20 |
Garofalo Elizabeth A. |
Director |
9,450 |
2025-06-12 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-15 |
Berkley Neil Lindsay |
CFO & Chief Business Officer |
RSU Award |
54,600 |
- |
- |
| 2026-03-13 |
Rosenthal Arnon |
Chief Executive Officer |
RSU Award |
116,246 |
- |
- |
| 2026-03-10 |
Wong-sarad Grace |
Principal Accounting Officer |
Informative Sell |
1,000 |
$2.65 |
$2.65K |
| 2026-03-02 |
Berkley Neil Lindsay |
CFO & Chief Business Officer |
Informative Sell |
29,649 |
$2.12 |
$62.95K |
| 2026-03-03 |
Wong-sarad Grace |
Principal Accounting Officer |
Informative Sell |
3,367 |
$2.08 |
$7.01K |
| 2026-03-02 |
Wong-sarad Grace |
Principal Accounting Officer |
Informative Sell |
8,071 |
$2.12 |
$17.14K |
| 2026-03-02 |
Rosenthal Arnon |
Chief Executive Officer |
Informative Sell |
81,864 |
$2.12 |
$173.82K |
| 2026-02-26 |
Wong-sarad Grace |
Principal Accounting Officer |
Informative Sell |
4,079 |
$2.50 |
$10.2K |
| 2025-12-05 |
Wong-sarad Grace |
Principal Accounting Officer |
Informative Sell |
4,753 |
$1.21 |
$5.75K |
| 2025-12-03 |
Berkley Neil Lindsay |
Chief Bus Ofcr & Interim CFO |
Informative Sell |
37,261 |
$1.12 |
$41.72K |
| 2025-12-03 |
Wong-sarad Grace |
Principal Accounting Officer |
Informative Sell |
8,056 |
$1.12 |
$9.02K |
| 2025-12-03 |
Kenkare-mitra Sara |
President and Head of R&d |
Informative Sell |
41,687 |
$1.12 |
$46.67K |
| 2025-12-03 |
Rosenthal Arnon |
Chief Executive Officer |
Informative Sell |
104,347 |
$1.12 |
$116.83K |
| 2025-11-10 |
Berkley Neil Lindsay |
Chief Bus Ofcr & Interim CFO |
RSU Award |
195,000 |
$1.31 |
$255.45K |
| 2025-11-10 |
Wong-sarad Grace |
Principal Accounting Officer |
RSU Award |
48,535 |
$1.31 |
$63.58K |
| 2025-11-10 |
Rosenthal Arnon |
Chief Executive Officer |
RSU Award |
522,500 |
$1.31 |
$684.48K |
| 2025-09-02 |
Berkley Neil Lindsay |
Principal Financial Officer |
Informative Sell |
15,842 |
$2.50 |
$39.55K |
| 2025-09-02 |
Wong-sarad Grace |
Principal Accounting Officer |
Informative Sell |
5,910 |
$2.50 |
$14.76K |
| 2025-09-02 |
Kenkare-mitra Sara |
President and Head of R&d |
Informative Sell |
23,638 |
$2.50 |
$59.02K |
| 2025-09-02 |
Rosenthal Arnon |
Chief Executive Officer |
Informative Sell |
51,562 |
$2.50 |
$128.74K |
| 2025-08-26 |
Hammond Paula |
Director |
Informative Sell |
14,000 |
$2.36 |
$33K |
| 2025-07-01 |
Berkley Neil Lindsay |
Principal Financial Officer |
RSU Award |
18,000 |
$1.42 |
$25.56K |
| 2025-07-01 |
Kenkare-mitra Sara |
President and Head of R&d |
RSU Award |
18,250 |
$1.42 |
$25.92K |
| 2025-07-01 |
Rosenthal Arnon |
Chief Executive Officer |
RSU Award |
45,700 |
$1.42 |
$64.89K |
| 2025-06-20 |
Berkley Neil Lindsay |
Principal Financial Officer |
Unknown |
12,975 |
$1.11 |
$14.34K |
