MPM Oncology Impact Management GP LLC

CIK 1721035 · last filed 2021-08-25

MPM Oncology Impact Management GP LLC is a corporate insider who has filed 6 SEC Form 4 insider transactions across 2 companies since 2021. The most recent filing shows the insider sold $12.4M of CGEM on Aug 25, 2021. Across all open-market trades the lifetime net is −$7.6M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $137.0M 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.

Disclosed Exposure

$136.97M

Companies

2

Total Filings

6

Lifetime Open-Market Net

-$7.60M

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
CGEM	10%+ Owner	7,858,018	$17.43	$136.97M	$12.79M	2	2021-08-25
Harpoon Therapeutics, Inc. (HARP) Delisted	10%+ Owner	640,275	$23.01	$14.73M	-$20.40M	4	2021-05-24

Recent Filings

6 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
2021-08-25	CGEM	Sell (S)	−423,576	-$12.41M	EDGAR
2021-05-24	Harpoon Therapeutics, Inc. (HARP) Delisted	Sell (S)	−79,535	-$1.61M	EDGAR
2021-04-29	Harpoon Therapeutics, Inc. (HARP) Delisted	Sell (S)	−650,715	-$14.31M	EDGAR
2021-04-22	Harpoon Therapeutics, Inc. (HARP) Delisted	Sell (S)	−44,860	-$851.1K	EDGAR
2021-04-20	Harpoon Therapeutics, Inc. (HARP) Delisted	Sell (S)	−190,760	-$3.63M	EDGAR
2021-01-14	CGEM	Mixed	+31,655,548	$25.20M	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.