Home

Mark Worthington

CIK 1861464 · GENERAL COUNSEL and CCO · last filed 2026-04-13

Mark Worthington is a GENERAL COUNSEL and CCO who has filed 18 SEC Form 4 insider transactions across 2 companies since 2021. The most recent filing, for LONA, was dated Apr 13, 2026. Across all open-market trades the lifetime net is −$42.9K, making them a net seller over the disclosed history. Current disclosed insider exposure totals $161.0K 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.

Loading insider history…
Disclosed Exposure

$161.0K

Companies

2

Total Filings

18

Lifetime Open-Market Net

-$42.9K

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
LONA GENERAL COUNSEL and CCO 19,704 $8.17 $161.0K -$7.1K 2 2026-04-13
LeonaBio, Inc. (ATHA) Delisted General Counsel and CCO 14,854 $6.92 $102.8K -$35.8K 14 2026-01-05

Recent Filings

18 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
2026-04-13 LONA Grant (A) — $0 EDGAR
2026-03-05 LONA Mixed +4,398 -$7.1K EDGAR
2026-01-05 LeonaBio, Inc. (ATHA) Delisted Mixed +2,791 -$6.0K EDGAR
2025-12-29 LeonaBio, Inc. (ATHA) Delisted Grant (A) — $0 EDGAR
2025-07-02 LeonaBio, Inc. (ATHA) Delisted Mixed +28,140 -$2.5K EDGAR
2025-07-01 LONA Notice (144) −8,526 -$2.5K EDGAR
2025-03-04 LeonaBio, Inc. (ATHA) Delisted Grant (A) — $0 EDGAR
2025-01-03 LeonaBio, Inc. (ATHA) Delisted Mixed +31,808 -$2.8K EDGAR
2025-01-02 LONA Notice (144) −8,510 -$4.8K EDGAR
2024-10-03 LeonaBio, Inc. (ATHA) Delisted Grant (A) — $0 EDGAR
Showing 1–10 of 18
Page 1 of 2
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.