ALEC

Alector, Inc.

Insider trading activity for Alector, Inc., straight from SEC Form 4 filings. Net figures below count open-market buys and sales only — grants, option exercises and tax withholding are excluded because they are compensation, not decisions to trade.

Past 3 months

-$296.1K

net selling

Bought(0 · 0 insiders): $0
Sold(5 · 3 insiders): $296.1K

Past 6 months

-$529.1K

net selling

Bought(0 · 0 insiders): $0
Sold(10 · 3 insiders): $529.1K

Past 12 months

-$1M

net selling

Bought(0 · 0 insiders): $0
Sold(21 · 4 insiders): $1M

Transaction history

The 78 most recent Form 4 transactions.

Open in screener →

Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Insider	Role	Type	Shares	Price	Value	Δ Own	Filing
Sep 4	Wong-Sarad Grace	Principal Accounting…	SSELL◷?	3,625	$2.51	$9.1K	-3.3%	Open the original filing on SEC.gov
Sep 3	Rosenthal Arnon	Chief Executive Officer	SSELL	72,606	$2.66	$193.5K	-3.1%	Open the original filing on SEC.gov
Sep 3	Berkley Neil Lindsay	CFO & Chief Business…	SSELL	29,251	$2.66	$77.9K	-7.7%	Open the original filing on SEC.gov
Sep 3	Wong-Sarad Grace	Principal Accounting…	SSELL	5,165	$2.67	$13.8K	-4.5%	Open the original filing on SEC.gov
Sep 2	Wong-Sarad Grace	Principal Accounting…	SSELL◷?	656	$2.75	$1.8K	-0.6%	Open the original filing on SEC.gov
Aug 19	Rosenthal Arnon	Chief Executive Officer	GGIFT	350,000	—	—	+53.6%	Open the original filing on SEC.gov
Aug 19	Rosenthal Arnon	Chief Executive Officer	GGIFT	350,000	—	—	+53.6%	Open the original filing on SEC.gov
Aug 19	Rosenthal Arnon	Chief Executive Officer	GGIFT	350,000	—	—	+53.6%	Open the original filing on SEC.gov
Aug 19	Rosenthal Arnon	Chief Executive Officer	GGIFT	1.1M	—	—	-53.2%	Open the original filing on SEC.gov
Jul 9	Wong-Sarad Grace	Principal Accounting…	AGRANT	20,000	—	—	+20.9%	Open the original filing on SEC.gov
Jun 17	Yaffe Kristine	Director	AGRANT◆	9,450	—	—	—	Open the original filing on SEC.gov
Jun 17	Yaffe Kristine	Director	AGRANT	28,700	—	—	+30.1%	Open the original filing on SEC.gov
Jun 17	Garofalo Elizabeth A.	Director	AGRANT◆	9,450	—	—	—	Open the original filing on SEC.gov
Jun 17	Garofalo Elizabeth A.	Director	AGRANT	28,700	—	—	+31.9%	Open the original filing on SEC.gov
Jun 17	Hammond Paula	Director	AGRANT◆	9,450	—	—	—	Open the original filing on SEC.gov
Jun 17	Hammond Paula	Director	AGRANT	28,700	—	—	+38.3%	Open the original filing on SEC.gov
Jun 17	Scheller Richard H	Director	AGRANT◆	9,450	—	—	—	Open the original filing on SEC.gov
Jun 17	Scheller Richard H	Director	AGRANT	28,700	—	—	+27.0%	Open the original filing on SEC.gov
Jun 17	Altmeyer Mark	Director	AGRANT◆	9,450	—	—	—	Open the original filing on SEC.gov
Jun 17	Altmeyer Mark	Director	AGRANT	28,700	—	—	+41.0%	Open the original filing on SEC.gov
Jun 17	Desouza Errol B	Director	AGRANT◆	9,450	—	—	—	Open the original filing on SEC.gov
Jun 17	Desouza Errol B	Director	AGRANT	28,700	—	—	+41.0%	Open the original filing on SEC.gov
Jun 17	Lavigne Louis J Jr	Director	AGRANT◆	9,450	—	—	—	Open the original filing on SEC.gov
Jun 17	Lavigne Louis J Jr	Director	AGRANT	28,700	—	—	+28.9%	Open the original filing on SEC.gov
Jun 3	Wong-Sarad Grace	Principal Accounting…	SSELL◷?	3,475	$1.88	$6.5K	-3.5%	Open the original filing on SEC.gov
Jun 2	Rosenthal Arnon	Chief Executive Officer	SSELL	87,216	$1.97	$172.2K	-3.5%	Open the original filing on SEC.gov
Jun 2	Wong-Sarad Grace	Principal Accounting…	SSELL	5,709	$1.97	$11.3K	-5.5%	Open the original filing on SEC.gov
Jun 2	Berkley Neil Lindsay	CFO & Chief Business…	SSELL	19,360	$1.97	$38.2K	-4.9%	Open the original filing on SEC.gov
Jun 1	Scheller Richard H	Director	AGRANT	10,833	—	—	+11.4%	Open the original filing on SEC.gov
Apr 16	Wong-Sarad Grace	Principal Accounting…	SSELL◷	1,820	$2.65	$4.8K	-1.7%	Open the original filing on SEC.gov
Mar 15	Berkley Neil Lindsay	CFO & Chief Business…	AGRANT⚠	54,600	—	—	+15.8%	Open the original filing on SEC.gov
Mar 13	Rosenthal Arnon	Chief Executive Officer	AGRANT	116,246	—	—	+5.0%	Open the original filing on SEC.gov
Mar 10	Wong-Sarad Grace	Principal Accounting…	SSELL◷	1,000	$2.65	$2.7K	-0.9%	Open the original filing on SEC.gov
Mar 3	Wong-Sarad Grace	Principal Accounting…	SSELL◷	3,367	$2.08	$7K	-3.0%	Open the original filing on SEC.gov
Mar 2	Berkley Neil Lindsay	CFO & Chief Business…	SSELL	29,649	$2.12	$63K	-7.9%	Open the original filing on SEC.gov
Mar 2	Wong-Sarad Grace	Principal Accounting…	SSELL	8,071	$2.12	$17.1K	-6.8%	Open the original filing on SEC.gov
Mar 2	Rosenthal Arnon	Chief Executive Officer	SSELL	81,864	$2.12	$173.8K	-3.4%	Open the original filing on SEC.gov
Feb 26	Wong-Sarad Grace	Principal Accounting…	SSELL◷	4,079	$2.50	$10.2K	-3.3%	Open the original filing on SEC.gov
Dec 5, 2025	Wong-Sarad Grace	Principal Accounting…	SSELL◷?	4,753	$1.21	$5.8K	-3.7%	Open the original filing on SEC.gov
Dec 3, 2025	Berkley Neil Lindsay	Chief Bus Ofcr &…	SSELL	37,261	$1.12	$41.7K	-9.0%	Open the original filing on SEC.gov
Dec 3, 2025	Wong-Sarad Grace	Principal Accounting…	SSELL	8,056	$1.12	$9K	-5.9%	Open the original filing on SEC.gov
Dec 3, 2025	Kenkare-Mitra Sara	President and Head of…	SSELL	41,687	$1.12	$46.7K	-7.7%	Open the original filing on SEC.gov
Dec 3, 2025	Rosenthal Arnon	Chief Executive Officer	SSELL	104,347	$1.12	$116.8K	-4.1%	Open the original filing on SEC.gov
Nov 10, 2025	Berkley Neil Lindsay	Chief Bus Ofcr &…	AGRANT◆	195,000	—	—	—	Open the original filing on SEC.gov
Nov 10, 2025	Berkley Neil Lindsay	Chief Bus Ofcr &…	AGRANT	65,000	—	—	+18.8%	Open the original filing on SEC.gov
Nov 10, 2025	Wong-Sarad Grace	Principal Accounting…	AGRANT◆	48,535	—	—	—	Open the original filing on SEC.gov
Nov 10, 2025	Wong-Sarad Grace	Principal Accounting…	AGRANT	32,343	—	—	+31.3%	Open the original filing on SEC.gov
Nov 10, 2025	Rosenthal Arnon	Chief Executive Officer	AGRANT◆	522,500	—	—	—	Open the original filing on SEC.gov
Nov 10, 2025	Rosenthal Arnon	Chief Executive Officer	AGRANT	174,167	—	—	+7.4%	Open the original filing on SEC.gov
Sep 2, 2025	Wong-Sarad Grace	Principal Accounting…	SSELL	5,910	$2.50	$14.8K	-5.4%	Open the original filing on SEC.gov
Sep 2, 2025	Berkley Neil Lindsay	Principal Financial…	SSELL	15,842	$2.50	$39.6K	-4.4%	Open the original filing on SEC.gov
Sep 2, 2025	Kenkare-Mitra Sara	President and Head of…	SSELL	23,638	$2.50	$59K	-4.2%	Open the original filing on SEC.gov
Sep 2, 2025	Rosenthal Arnon	Chief Executive Officer	SSELL	51,562	$2.50	$128.7K	-2.1%	Open the original filing on SEC.gov
Aug 26, 2025	Hammond Paula	Director	SSELL◷	14,000	$2.36	$33K	-15.8%	Open the original filing on SEC.gov
Jul 1, 2025	Berkley Neil Lindsay	Principal Financial…	AGRANT◆	18,000	—	—	—	Open the original filing on SEC.gov
Jul 1, 2025	Kenkare-Mitra Sara	President and Head of…	AGRANT◆	18,250	—	—	—	Open the original filing on SEC.gov
Jul 1, 2025	Kenkare-Mitra Sara	President and Head of…	AGRANT	54,725	—	—	+10.7%	Open the original filing on SEC.gov
Jul 1, 2025	Rosenthal Arnon	Chief Executive Officer	AGRANT◆	45,700	—	—	—	Open the original filing on SEC.gov
Jul 1, 2025	Rosenthal Arnon	Chief Executive Officer	AGRANT	137,125	—	—	+5.7%	Open the original filing on SEC.gov
Jun 20, 2025	Yaffe Kristine	Director	SSELL◷	1,000	$1.44	$1.4K	-1.0%	Open the original filing on SEC.gov
Jun 11, 2025	Hammond Paula	Director	AGRANT◆	9,450	—	—	—	Open the original filing on SEC.gov
Jun 11, 2025	Hammond Paula	Director	AGRANT	28,700	—	—	+47.7%	Open the original filing on SEC.gov
Jun 11, 2025	Yaffe Kristine	Director	AGRANT◆	9,450	—	—	—	Open the original filing on SEC.gov
Jun 11, 2025	Yaffe Kristine	Director	AGRANT	28,700	—	—	+42.4%	Open the original filing on SEC.gov
Jun 11, 2025	Garofalo Elizabeth A.	Director	AGRANT◆	9,450	—	—	—	Open the original filing on SEC.gov
Jun 11, 2025	Garofalo Elizabeth A.	Director	AGRANT	28,700	—	—	+46.9%	Open the original filing on SEC.gov
Jun 11, 2025	Scheller Richard H	Director	AGRANT◆	9,450	—	—	—	Open the original filing on SEC.gov
Jun 11, 2025	Scheller Richard H	Director	AGRANT	28,700	—	—	+43.0%	Open the original filing on SEC.gov
Jun 11, 2025	Lavigne Louis J Jr	Director	AGRANT◆	9,450	—	—	—	Open the original filing on SEC.gov
Jun 11, 2025	Lavigne Louis J Jr	Director	AGRANT	28,700	—	—	+40.6%	Open the original filing on SEC.gov
Jun 11, 2025	Desouza Errol B	Director	AGRANT◆	9,450	—	—	—	Open the original filing on SEC.gov
Jun 11, 2025	Desouza Errol B	Director	AGRANT	28,700	—	—	+69.6%	Open the original filing on SEC.gov
Jun 11, 2025	Altmeyer Mark	Director	AGRANT◆	9,450	—	—	—	Open the original filing on SEC.gov
Jun 11, 2025	Altmeyer Mark	Director	AGRANT	28,700	—	—	+69.6%	Open the original filing on SEC.gov
Jun 2, 2025	Grasso Marc	Chief Financial Officer	SSELL	16,488	$1.34	$22.1K	-5.3%	Open the original filing on SEC.gov
Jun 2, 2025	Kenkare-Mitra Sara	President and Head of…	SSELL	23,890	$1.34	$32K	-4.5%	Open the original filing on SEC.gov
Jun 2, 2025	Rosenthal Arnon	Chief Executive Officer	SSELL	52,087	$1.34	$69.7K	-2.1%	Open the original filing on SEC.gov
May 2, 2025	Scheller Richard H	Director	AGRANT	15,833	—	—	+31.1%	Open the original filing on SEC.gov

SSELL◷?$9.1K

Wong-Sarad Grace · Principal Accounti…Sep 4

3,625 sh @ $2.51 · -3.3% own

SSELL$193.5K

Rosenthal Arnon · Chief Executive…Sep 3

72,606 sh @ $2.66 · -3.1% own

SSELL$77.9K

Berkley Neil Lindsay · CFO & Chief…Sep 3

29,251 sh @ $2.66 · -7.7% own

SSELL$13.8K

Wong-Sarad Grace · Principal Accounti…Sep 3

5,165 sh @ $2.67 · -4.5% own

SSELL◷?$1.8K

Wong-Sarad Grace · Principal Accounti…Sep 2

656 sh @ $2.75 · -0.6% own

GGIFT—

Rosenthal Arnon · Chief Executive…Aug 19

350,000 sh · +53.6% own

GGIFT—

Rosenthal Arnon · Chief Executive…Aug 19

350,000 sh · +53.6% own

GGIFT—

Rosenthal Arnon · Chief Executive…Aug 19

350,000 sh · +53.6% own

GGIFT—

Rosenthal Arnon · Chief Executive…Aug 19

1.1M sh · -53.2% own

AGRANT—

Wong-Sarad Grace · Principal Accounti…Jul 9

20,000 sh · +20.9% own

AGRANT◆—

Yaffe Kristine · DirectorJun 17

9,450 sh

AGRANT—

Yaffe Kristine · DirectorJun 17

28,700 sh · +30.1% own

AGRANT◆—

Garofalo Elizabeth A. · DirectorJun 17

9,450 sh

AGRANT—

Garofalo Elizabeth A. · DirectorJun 17

28,700 sh · +31.9% own

AGRANT◆—

Hammond Paula · DirectorJun 17

9,450 sh

AGRANT—

Hammond Paula · DirectorJun 17

28,700 sh · +38.3% own

AGRANT◆—

Scheller Richard H · DirectorJun 17

9,450 sh

AGRANT—

Scheller Richard H · DirectorJun 17

28,700 sh · +27.0% own

AGRANT◆—

Altmeyer Mark · DirectorJun 17

9,450 sh

AGRANT—

Altmeyer Mark · DirectorJun 17

28,700 sh · +41.0% own

AGRANT◆—

Desouza Errol B · DirectorJun 17

9,450 sh

AGRANT—

Desouza Errol B · DirectorJun 17

28,700 sh · +41.0% own

AGRANT◆—

Lavigne Louis J Jr · DirectorJun 17

9,450 sh

AGRANT—

Lavigne Louis J Jr · DirectorJun 17

28,700 sh · +28.9% own

SSELL◷?$6.5K

Wong-Sarad Grace · Principal Accounti…Jun 3

3,475 sh @ $1.88 · -3.5% own

SSELL$172.2K

Rosenthal Arnon · Chief Executive…Jun 2

87,216 sh @ $1.97 · -3.5% own

SSELL$11.3K

Wong-Sarad Grace · Principal Accounti…Jun 2

5,709 sh @ $1.97 · -5.5% own

SSELL$38.2K

Berkley Neil Lindsay · CFO & Chief…Jun 2

19,360 sh @ $1.97 · -4.9% own

AGRANT—

Scheller Richard H · DirectorJun 1

10,833 sh · +11.4% own

SSELL◷$4.8K

Wong-Sarad Grace · Principal Accounti…Apr 16

1,820 sh @ $2.65 · -1.7% own

AGRANT⚠—

Berkley Neil Lindsay · CFO & Chief…Mar 15

54,600 sh · +15.8% own

AGRANT—

Rosenthal Arnon · Chief Executive…Mar 13

116,246 sh · +5.0% own

SSELL◷$2.7K

Wong-Sarad Grace · Principal Accounti…Mar 10

1,000 sh @ $2.65 · -0.9% own

SSELL◷$7K

Wong-Sarad Grace · Principal Accounti…Mar 3

3,367 sh @ $2.08 · -3.0% own

SSELL$63K

Berkley Neil Lindsay · CFO & Chief…Mar 2

29,649 sh @ $2.12 · -7.9% own

SSELL$17.1K

Wong-Sarad Grace · Principal Accounti…Mar 2

8,071 sh @ $2.12 · -6.8% own

SSELL$173.8K

Rosenthal Arnon · Chief Executive…Mar 2

81,864 sh @ $2.12 · -3.4% own

SSELL◷$10.2K

Wong-Sarad Grace · Principal Accounti…Feb 26

4,079 sh @ $2.50 · -3.3% own

SSELL◷?$5.8K

Wong-Sarad Grace · Principal Accounti…Dec 5, 2025

4,753 sh @ $1.21 · -3.7% own

SSELL$41.7K

Berkley Neil Lindsay · Chief Bus Ofcr &…Dec 3, 2025

37,261 sh @ $1.12 · -9.0% own

SSELL$9K

Wong-Sarad Grace · Principal Accounti…Dec 3, 2025

8,056 sh @ $1.12 · -5.9% own

SSELL$46.7K

Kenkare-Mitra Sara · President and…Dec 3, 2025

41,687 sh @ $1.12 · -7.7% own

SSELL$116.8K

Rosenthal Arnon · Chief Executive…Dec 3, 2025

104,347 sh @ $1.12 · -4.1% own

AGRANT◆—

Berkley Neil Lindsay · Chief Bus Ofcr &…Nov 10, 2025

195,000 sh

AGRANT—

Berkley Neil Lindsay · Chief Bus Ofcr &…Nov 10, 2025

65,000 sh · +18.8% own

AGRANT◆—

Wong-Sarad Grace · Principal Accounti…Nov 10, 2025

48,535 sh

AGRANT—

Wong-Sarad Grace · Principal Accounti…Nov 10, 2025

32,343 sh · +31.3% own

AGRANT◆—

Rosenthal Arnon · Chief Executive…Nov 10, 2025

522,500 sh

AGRANT—

Rosenthal Arnon · Chief Executive…Nov 10, 2025

174,167 sh · +7.4% own

SSELL$14.8K

Wong-Sarad Grace · Principal Accounti…Sep 2, 2025

5,910 sh @ $2.50 · -5.4% own

SSELL$39.6K

Berkley Neil Lindsay · Principal Financia…Sep 2, 2025

15,842 sh @ $2.50 · -4.4% own

SSELL$59K

Kenkare-Mitra Sara · President and…Sep 2, 2025

23,638 sh @ $2.50 · -4.2% own

SSELL$128.7K

Rosenthal Arnon · Chief Executive…Sep 2, 2025

51,562 sh @ $2.50 · -2.1% own

SSELL◷$33K

Hammond Paula · DirectorAug 26, 2025

14,000 sh @ $2.36 · -15.8% own

AGRANT◆—

Berkley Neil Lindsay · Principal Financia…Jul 1, 2025

18,000 sh

AGRANT◆—

Kenkare-Mitra Sara · President and…Jul 1, 2025

18,250 sh

AGRANT—

Kenkare-Mitra Sara · President and…Jul 1, 2025

54,725 sh · +10.7% own

AGRANT◆—

Rosenthal Arnon · Chief Executive…Jul 1, 2025

45,700 sh

AGRANT—

Rosenthal Arnon · Chief Executive…Jul 1, 2025

137,125 sh · +5.7% own

SSELL◷$1.4K

Yaffe Kristine · DirectorJun 20, 2025

1,000 sh @ $1.44 · -1.0% own

AGRANT◆—

Hammond Paula · DirectorJun 11, 2025

9,450 sh

AGRANT—

Hammond Paula · DirectorJun 11, 2025

28,700 sh · +47.7% own

AGRANT◆—

Yaffe Kristine · DirectorJun 11, 2025

9,450 sh

AGRANT—

Yaffe Kristine · DirectorJun 11, 2025

28,700 sh · +42.4% own

AGRANT◆—

Garofalo Elizabeth A. · DirectorJun 11, 2025

9,450 sh

AGRANT—

Garofalo Elizabeth A. · DirectorJun 11, 2025

28,700 sh · +46.9% own

AGRANT◆—

Scheller Richard H · DirectorJun 11, 2025

9,450 sh

AGRANT—

Scheller Richard H · DirectorJun 11, 2025

28,700 sh · +43.0% own

AGRANT◆—

Lavigne Louis J Jr · DirectorJun 11, 2025

9,450 sh

AGRANT—

Lavigne Louis J Jr · DirectorJun 11, 2025

28,700 sh · +40.6% own

AGRANT◆—

Desouza Errol B · DirectorJun 11, 2025

9,450 sh

AGRANT—

Desouza Errol B · DirectorJun 11, 2025

28,700 sh · +69.6% own

AGRANT◆—

Altmeyer Mark · DirectorJun 11, 2025

9,450 sh

AGRANT—

Altmeyer Mark · DirectorJun 11, 2025

28,700 sh · +69.6% own

SSELL$22.1K

Grasso Marc · Chief Financial…Jun 2, 2025

16,488 sh @ $1.34 · -5.3% own

SSELL$32K

Kenkare-Mitra Sara · President and…Jun 2, 2025

23,890 sh @ $1.34 · -4.5% own

SSELL$69.7K

Rosenthal Arnon · Chief Executive…Jun 2, 2025

52,087 sh @ $1.34 · -2.1% own

AGRANT—

Scheller Richard H · DirectorMay 2, 2025

15,833 sh · +31.1% own

Filing record

How quickly insiders here report their trades. Section 16 allows two business days from the transaction.

All 33 filings we hold were filed within the two-business-day deadline.

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured · All late filings

Insiders at this company

Everyone who has filed a Form 4 for this issuer.

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