Latest filingSep 04, 2026Most recent Form 4
ALEC
Alector, Inc.
NasdaqHealthcareBiological Products, (No Diagnostic Substances)
Insider activity for last month from 08/05 to 09/05. 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 buying$00 buys
Total selling$29.6M5 sells
Net open-market-$29.6M3 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period7transactions
- S · Open-market sells · dominant5 · 71%
- G · Gifts2 · 29%
Activity by reported role
A joint filing can contribute to multiple roles8transactions
- Chief executive officer · dominant3 · 38%
- PAO3 · 38%
- CBO1 · 13%
- Chief financial officer1 · 13%
Distinct insiders active
Reporting-owner CIKs by month · peak Sep 2026 (3)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeWong-Sarad GraceCommon Stock · Direct
106,015Sep 04, 2026
Rosenthal ArnonCommon Stock · Indirect · See footnote
922,875Aug 19, 2026
Rosenthal ArnonCommon Stock · Direct
2,294,600Sep 03, 2026
Berkley Neil LindsayCommon Stock · Direct
350,649Sep 03, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 05 → Sep 05
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Top insiders
By absolute net value across the selected period- RA-$193.5k
- BL-$77.9k
- WG-$24.7k
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
ALEC transaction history
Filters apply within this company and selected period by default| Ticker | Insider | Role | Type | Shares | Value | Code | Signals | 90d return | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|---|
| ALEC | Wong-Sarad Grace | PAO | sale10b5-1 | 3.62k | -$909k | S | — | 0.0% | 09/04 | 09/04 |
| ALEC | Wong-Sarad Grace | PAO | sale10b5-1 | 5.16k | -$1.37M | S | — | 0.0% | 09/04 | 09/03 |
| ALEC | Wong-Sarad Grace | PAO | sale10b5-1 | 656 | -$180k | S | — | 0.0% | 09/04 | 09/02 |
| ALEC | Berkley Neil Lindsay | CFOCBO | sale | 29.2k | -$7.79M | S | — | 0.0% | 09/04 | 09/03 |
| ALEC | Rosenthal Arnon | CEO | sale | 72.6k | -$19.3M | S | — | 0.0% | 09/04 | 09/03 |
| ALEC | Rosenthal Arnon | CEO | gift | 350k | $0 | G | −0.8% | 08/21 | 08/19 | |
| ALEC | Rosenthal Arnon | CEO | gift | 1.05M | $0 | G | −0.8% | 08/21 | 08/19 |
Alector, Inc. Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at Alector, Inc.?
Wong-Sarad Grace, Berkley Neil Lindsay, Rosenthal Arnon.
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?
Wong-Sarad Grace reported a sale on Sep 04, 2026 valued at $909k. Read the SEC filing.
What is the recent purchase and sale balance?
Net open-market selling in the selected period was $296,086.98. Sales can occur for many non-investment reasons.
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.