Mack John Prosper

Director · OBIO

As of 2026-09-16, Mack John Prosper has 6 Form 4 transactions on record across 1 company — 3 in the trailing 12 months.

Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.

Reconstructed holdings

Direct: $400KIndirect: $0$400Kas of 2026-09-16
  • Direct $400K
  • Indirect $0
OBIOdirect66,544 sh$400K

Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.

Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.

Trades by company

OBIO · 6 trades
2026-08-12: Withheld for tax, 4,885 sh ($22K)2026-06-24: Withheld for tax, 3,510 sh ($0)2026-06-23: Award / grant, 34,653 sh ($0)2025-08-07: Award / grant, 15,000 sh ($0)2025-06-24: Award / grant, 12,422 sh ($0)2025-06-24: Award / grant, 36,797 sh ($0)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
6 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-08-12OBIOWithheld for tax4,88566,544Form 4
2026-06-24OBIOWithheld for tax3,51071,429Form 4
2026-06-23OBIOAward / grant34,65374,939Form 4
2025-08-07OBIOAward / grant15,00040,286Form 4
2025-06-24OBIOAward / grant12,42225,286Form 4
2025-06-24OBIOAward / grant36,79736,797Form 4

Source: SEC Form 4 filings. Each row links to its original filing.

Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.