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Stephen Mayo

CIK 1849061 · last filed 2026-06-23

Stephen Mayo is a corporate insider who has filed 25 SEC Form 4 insider transactions across 3 companies since 2021. The most recent filing, for ALLO, was dated Jun 23, 2026. Across all open-market trades the lifetime net is −$645.9K, making them a net seller over the disclosed history. Current disclosed insider exposure totals $386.5K across reported positions.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

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Disclosed Exposure

$386.5K

Companies

3

Total Filings

25

Lifetime Open-Market Net

-$645.9K

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
ALLO Director 25,328 $2.10 $53.2K -$42.9K 6 2026-06-23
SRPT Director 18,640 $17.18 $320.2K -$603.0K 9 2026-06-05
MRK Director 100 $130.92 $13.1K $0 7 2026-06-02

Recent Filings

25 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2026-06-23 ALLO Grant (A) — $0 EDGAR
2026-06-05 SRPT Grant (A) +16,875 $0 EDGAR
2026-06-02 MRK Grant (A) — $0 EDGAR
2026-03-13 SRPT Sell (S) −7,239 -$123.2K EDGAR
2026-03-12 SRPT Notice (144) −7,239 -$123.2K EDGAR
2025-06-23 ALLO Grant (A) — $0 EDGAR
2025-06-03 MRK Grant (A) — $0 EDGAR
2025-03-11 SRPT Grant (A) +2,383 $0 EDGAR
2024-06-07 ALLO Grant (A) — $0 EDGAR
2024-06-04 MRK Grant (A) — $0 EDGAR
Showing 1–10 of 25
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Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.