Atlas Venture Opportunity Fund II, L.P.

CIK 1885327 · last filed 2025-02-10

Atlas Venture Opportunity Fund II, L.P. is a corporate insider who has filed 2 SEC Form 4 insider transactions across 2 companies since 2024. The most recent filing, for SION, was dated Feb 10, 2025. Across all open-market trades the lifetime net is −$95.6M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $270.7M 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

$270.71M

Companies

2

Total Filings

2

Lifetime Open-Market Net

-$95.58M

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
SION	10%+ Owner	3,694,020	$35.92	$132.69M	$6.48M	1	2025-02-10
DYN	10%+ Owner	7,587,471	$18.19	$138.02M	-$102.06M	1	2024-02-23

Recent Filings

2 filings

Form 4 transactions across all companies, newest first.

Filed	Symbol	Action	Net Shares	Net $	Link
2025-02-10	SION	Mixed	+22,164,120	$6.48M	EDGAR
2024-02-23	DYN	Sell (S)	−4,507,101	-$102.06M	EDGAR

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.