Total buying$00 buys
ALEC
Alector, Inc.
NasdaqHealthcareBiological Products, (No Diagnostic Substances)
Insider activity for last month from 09/20 to 10/20.
How these metrics are calculated
Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total selling$00 sells
Net open-market+$0Buying minus selling
Active insiders3Distinct reporting owners
Insider activity report
Calendar-month buckets within the selected date range
Latest filing: Oct 15, 2026
Open-market transaction mix · 0 transactions in the selected period
Code A includes awards, grants and other acquisitions; these are not open-market buys. A rolling period can include partial calendar months.
View exact monthly counts and disclosed values
| Month | Buys | Sells | Awards (A) | Buy value | Sell value | Net P/S value |
|---|---|---|---|---|---|---|
| Sep 2026 | 0 | 0 | 0 | $0 | $0 | $0 |
| Oct 2026 | 0 | 0 | 19 | $0 | $0 | $0 |
Distinct insiders active
Reporting-owner CIKs by month · peak Oct 2026 (3)Sep 2026Oct 2026
Largest insider activity
By absolute net disclosed value · current transaction page- RA—
- WG—
ALEC transaction history
Newest filings · 20 transactions per pageLatest insider transactions
Form 4 filings from last month.Filing-only signals
Deterministic matches in the selected period
Filing detail checks
Secondary metrics for the selected periodTransaction codes
By Form 4 transaction code in selected period32transactionstxns
- A · Grants / awards · dominant19 · 59%
- D · Issuer dispositions13 · 41%
Activity by reported role
A joint filing can contribute to multiple rolesChief executive officer16
PAO14
CBO2
Chief financial officer2
Reported Holdings After
Separated by insider, security, and ownership type
Rosenthal ArnonEmployee Stock Option (right to buy) · Direct
978,750Oct 14, 2026
Wong-Sarad GraceEmployee Stock Option (right to buy) · Direct
83,435Oct 14, 2026
Berkley Neil LindsayCommon Stock · Direct
395,216Oct 14, 2026
Berkley Neil LindsayEmployee Stock Option (right to buy) · Direct
190,000Oct 14, 2026
Wong-Sarad GraceCommon Stock · Direct
161,570Oct 14, 2026
Rosenthal ArnonCommon Stock · Direct
2,512,100Oct 14, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Current transaction page only · each cell is a filing date · buys green, sells redSep 20 → Oct 20
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Alector, Inc. Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at Alector, Inc.?
Rosenthal Arnon, Wong-Sarad Grace, Berkley Neil Lindsay.
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
No code-S sale is available for this period.
What is the recent purchase and sale balance?
No code-P purchases or code-S sales were reported in the selected period.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.