ARCH Venture Partners XII, LLC
SEC Form 4 insider trading activity
ARCH Venture Partners XII, LLC has filed 3 SEC Form 4 filings (6 transaction rows) across 3 companies, including SPTX, MTSR, NMRA, with disclosures dating back to 2025. 3 of those filings fall inside the rolling window. Most recent filing: May 4, 2026.
On the most recent filing, ARCH Venture Partners XII, LLC is listed as 10% Owner at Seaport Therapeutics, Inc. Inside the rolling window, ARCH Venture Partners XII, LLC reported 2 open-market purchases totaling $24.8M in SPTX and NMRA and no open-market sales. The largest disclosed transaction in the window is a purchase of 1,100,000 SPTX shares on May 4, 2026, worth $19.8M.
Companies traded
Other insiders at SPTX
Insider Buying
$24.8M
reported purchases (SEC code P)
Insider Selling
$0
reported sales (SEC code S)
Companies
3
in the rolling window
Frequently asked questions
How many SEC Form 4 filings has ARCH Venture Partners XII, LLC made?
ARCH Venture Partners XII, LLC has filed 3 SEC Form 4 filings (6 transaction rows) across 3 companies, including SPTX, MTSR, NMRA since 2025.
Which companies does ARCH Venture Partners XII, LLC trade?
ARCH Venture Partners XII, LLC has filed SEC Form 4 disclosures for 3 companies, including SPTX, MTSR, NMRA.
When was ARCH Venture Partners XII, LLC's most recent SEC Form 4 filing?
ARCH Venture Partners XII, LLC's most recent SEC Form 4 filing on Tracefour is dated May 4, 2026.
What is ARCH Venture Partners XII, LLC's total buy and sell value in the current window?
Inside the rolling retention window, ARCH Venture Partners XII, LLC bought $24.8M and sold $0 based on SEC Form 4 filings.
What was ARCH Venture Partners XII, LLC's largest disclosed transaction?
The largest disclosed transaction in the current window is a purchase of 1,100,000 SPTX shares on 2026-05-04, worth $19.8M, per SEC Form 4 filings.