ARCH Venture Fund VII, L.P.

CIK 1402439 · last filed 2020-12-22

ARCH Venture Fund VII, L.P. is a corporate insider who has filed 4 SEC Form 4 insider transactions across 4 companies since 2013. The most recent filing, for MASS, was dated Dec 22, 2020. Across all open-market trades the lifetime net is +$58.5M, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $40.3M 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

$40.27M

Companies

4

Total Filings

4

Lifetime Open-Market Net

$58.50M

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
MASS	10%+ Owner	5,725,045	$7.03	$40.25M	$30.00M	1	2020-12-22
Syros Pharmaceuticals, Inc. (SYRS) Delisted	10%+ Owner	463,714	$0.00	$185	$25.00M	1	2016-07-07
PULM	10%+ Owner	11,069	$1.68	$18.6K	$3.50M	1	2015-06-17
bluebird bio, Inc. (BLUE) Delisted	10%+ Owner	89,679	$4.97	$445.7K	$0	1	2013-06-26

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
2020-12-22	MASS	Mixed	+28,625,225	$30.00M	EDGAR
2016-07-07	Syros Pharmaceuticals, Inc. (SYRS) Delisted	Mixed	+22,119,020	$25.00M	EDGAR
2015-06-17	PULM	Mixed	+16,005,192	$3.50M	EDGAR
2013-06-26	bluebird bio, Inc. (BLUE) Delisted	Conv (C)	+10,761,528	$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.