Home

John Prosper Mack

CIK 2031699 · last filed 2026-06-25

John Prosper Mack is a corporate insider who has filed 4 SEC Form 4 insider transactions across 1 company since 2024. The most recent filing, for OBIO, was dated Jun 25, 2026. Current disclosed insider exposure totals $272.9K 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

$272.9K

Companies

1

Total Filings

4

Lifetime Open-Market Net

$0

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
OBIO Director 71,429 $3.82 $272.9K $0 4 2026-06-25

Recent Filings

4 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
2026-06-25 OBIO Mixed +31,143 $0 EDGAR
2025-08-08 OBIO Grant (A) +15,000 $0 EDGAR
2025-06-26 OBIO Grant (A) +12,422 $0 EDGAR
2024-08-08 OBIO Grant (A) +12,864 $0 EDGAR
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.