ALEC

insider transactions

Alector, Inc. — buys & sells by directors, officers and 10% owners (SEC Form 4).

30D 90D 1Y

Net shares · 365d

-245.6K

0 buy · 245.6K sell

Net value · 365d

-$506.8K

$0 in · $506.8K out

Sentiment · 365d

Net selling

0% buying · 100% selling

Open-market trades · 365d

0 buy · 245.6K sell

Net buy / sell volume

Tap or hover the chart for daily net volume. Green = net buying, red = net selling.

All transactions

Grant·A
Jun 17, 26

Kristine Yaffe

Director

$0

9.4K sh

Own New
Grant·A
Jun 17, 26

Kristine Yaffe

Director

$0

28.7K sh

Own +30%
Grant·A
Jun 17, 26

Elizabeth A. Garofalo

Director

$0

9.4K sh

Own New
Grant·A
Jun 17, 26

Elizabeth A. Garofalo

Director

$0

28.7K sh

Own +32%
Grant·A
Jun 17, 26

Paula Hammond

Director

$0

9.4K sh

Own New
Grant·A
Jun 17, 26

Paula Hammond

Director

$0

28.7K sh

Own +38%
Grant·A
Jun 17, 26

Richard H Scheller

Director

$0

9.4K sh

Own New
Grant·A
Jun 17, 26

Richard H Scheller

Director

$0

28.7K sh

Own +27%
Grant·A
Jun 17, 26

Mark Altmeyer

Director

$0

9.4K sh

Own New
Grant·A
Jun 17, 26

Mark Altmeyer

Director

$0

28.7K sh

Own +41%
Grant·A
Jun 17, 26

Errol B Desouza

Director

$0

9.4K sh

Own New
Grant·A
Jun 17, 26

Errol B Desouza

Director

$0

28.7K sh

Own +41%
Grant·A
Jun 17, 26

Louis J Lavigne JR

Director

$0

9.4K sh

Own New
Grant·A
Jun 17, 26

Louis J Lavigne JR

Director

$0

28.7K sh

Own +29%
Sell·S
Jun 3, 26

Grace Wong-Sarad

Principal Accounting Officer

$6.5K

3.5K sh · $1.88

Own -4%
Sell·S
Jun 2, 26

Arnon Rosenthal KEY

Chief Executive Officer

$172.2K

87.2K sh · $1.97

Own -4%
Sell·S
Jun 2, 26

Grace Wong-Sarad

Principal Accounting Officer

$11.3K

5.7K sh · $1.97

Own -5%
Sell·S
Jun 2, 26

Neil Lindsay Berkley KEY

CFO & Chief Business Officer

$38.2K

19.4K sh · $1.97

Own -5%
Grant·A
Jun 1, 26

Richard H Scheller

Director

$0

10.8K sh

Own +11%
Sell·S
Apr 16, 26

Grace Wong-Sarad

Principal Accounting Officer · 10b5-1

$4.8K

1.8K sh · $2.65

Own -2%
Grant·A
Mar 15, 26

Neil Lindsay Berkley KEY

CFO & Chief Business Officer

$0

54.6K sh

Own +16%
Grant·A
Mar 13, 26

Arnon Rosenthal KEY

Chief Executive Officer

$0

116.2K sh

Own +5%
Sell·S
Mar 10, 26

Grace Wong-Sarad

Principal Accounting Officer · 10b5-1

$2.6K

1.0K sh · $2.65

Own -1%
Sell·S
Mar 3, 26

Grace Wong-Sarad

Principal Accounting Officer · 10b5-1

$7.0K

3.4K sh · $2.08

Own -3%
Sell·S
Mar 2, 26

Neil Lindsay Berkley KEY

CFO & Chief Business Officer

$63.0K

29.6K sh · $2.12

Own -8%
Sell·S
Mar 2, 26

Grace Wong-Sarad

Principal Accounting Officer

$17.1K

8.1K sh · $2.12

Own -7%
Sell·S
Mar 2, 26

Arnon Rosenthal KEY

Chief Executive Officer

$173.8K

81.9K sh · $2.12

Own -3%
Sell·S
Feb 26, 26

Grace Wong-Sarad

Principal Accounting Officer · 10b5-1

$10.2K

4.1K sh · $2.50

Own -3%

Date▾	Insider	Role	Type	Shares	Own Δ	Price	Value
Jun 17, 2026	Kristine Yaffe	Director	Grant A	9.4K	New	—	$0
Jun 17, 2026	Kristine Yaffe	Director	Grant A	28.7K	+30%	—	$0
Jun 17, 2026	Elizabeth A. Garofalo	Director	Grant A	9.4K	New	—	$0
Jun 17, 2026	Elizabeth A. Garofalo	Director	Grant A	28.7K	+32%	—	$0
Jun 17, 2026	Paula Hammond	Director	Grant A	9.4K	New	—	$0
Jun 17, 2026	Paula Hammond	Director	Grant A	28.7K	+38%	—	$0
Jun 17, 2026	Richard H Scheller	Director	Grant A	9.4K	New	—	$0
Jun 17, 2026	Richard H Scheller	Director	Grant A	28.7K	+27%	—	$0
Jun 17, 2026	Mark Altmeyer	Director	Grant A	9.4K	New	—	$0
Jun 17, 2026	Mark Altmeyer	Director	Grant A	28.7K	+41%	—	$0
Jun 17, 2026	Errol B Desouza	Director	Grant A	9.4K	New	—	$0
Jun 17, 2026	Errol B Desouza	Director	Grant A	28.7K	+41%	—	$0
Jun 17, 2026	Louis J Lavigne JR	Director	Grant A	9.4K	New	—	$0
Jun 17, 2026	Louis J Lavigne JR	Director	Grant A	28.7K	+29%	—	$0
Jun 3, 2026	Grace Wong-Sarad	Principal Accounting Officer	Sell S	3.5K	-4%	$1.88	$6.5K
Jun 2, 2026	Arnon Rosenthal KEY	Chief Executive Officer	Sell S	87.2K	-4%	$1.97	$172.2K
Jun 2, 2026	Grace Wong-Sarad	Principal Accounting Officer	Sell S	5.7K	-5%	$1.97	$11.3K
Jun 2, 2026	Neil Lindsay Berkley KEY	CFO & Chief Business Officer	Sell S	19.4K	-5%	$1.97	$38.2K
Jun 1, 2026	Richard H Scheller	Director	Grant A	10.8K	+11%	—	$0
Apr 16, 2026	Grace Wong-Sarad 10b5-1	Principal Accounting Officer	Sell S	1.8K	-2%	$2.65	$4.8K
Mar 15, 2026	Neil Lindsay Berkley KEY	CFO & Chief Business Officer	Grant A	54.6K	+16%	—	$0
Mar 13, 2026	Arnon Rosenthal KEY	Chief Executive Officer	Grant A	116.2K	+5%	—	$0
Mar 10, 2026	Grace Wong-Sarad 10b5-1	Principal Accounting Officer	Sell S	1.0K	-1%	$2.65	$2.6K
Mar 3, 2026	Grace Wong-Sarad 10b5-1	Principal Accounting Officer	Sell S	3.4K	-3%	$2.08	$7.0K
Mar 2, 2026	Neil Lindsay Berkley KEY	CFO & Chief Business Officer	Sell S	29.6K	-8%	$2.12	$63.0K
Mar 2, 2026	Grace Wong-Sarad	Principal Accounting Officer	Sell S	8.1K	-7%	$2.12	$17.1K
Mar 2, 2026	Arnon Rosenthal KEY	Chief Executive Officer	Sell S	81.9K	-3%	$2.12	$173.8K
Feb 26, 2026	Grace Wong-Sarad 10b5-1	Principal Accounting Officer	Sell S	4.1K	-3%	$2.50	$10.2K

About ALEC insider trading

This page tracks insider transactions for Alector, Inc. (ALEC) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.