Sakakibara Shan Riku
Chief Product Officer
Sakakibara Shan Riku has filed 6 SEC Form 4 filings (18 transaction rows) across 1 company, with disclosures dating back to 2025. 6 of those filings fall inside the rolling window. Most recent filing: Sep 14, 2026.
On the most recent filing, Sakakibara Shan Riku is listed as Chief Product Officer at BillionToOne, Inc. Inside the rolling window, Sakakibara Shan Riku reported no open-market purchases and 4 open-market sales totaling $2.8M in BLLN. The largest disclosed transaction in the window is a sale of 8,000 BLLN shares on Jul 9, 2026, worth $1.0M.
Companies traded
Other insiders at BLLN
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$2.8M
reported sales (SEC code S)
Companies
1
in the rolling window
Frequently asked questions
How many SEC Form 4 filings has Sakakibara Shan Riku made?
Sakakibara Shan Riku has filed 6 SEC Form 4 filings (18 transaction rows) across 1 company since 2025.
Which companies does Sakakibara Shan Riku trade?
Sakakibara Shan Riku has filed SEC Form 4 disclosures for 1 company, including BLLN.
When was Sakakibara Shan Riku's most recent SEC Form 4 filing?
Sakakibara Shan Riku's most recent SEC Form 4 filing on Tracefour is dated Sep 14, 2026.
What is Sakakibara Shan Riku's job title?
On the most recent SEC Form 4 filings tracked by Tracefour, Sakakibara Shan Riku is listed as Chief Product Officer.
What is Sakakibara Shan Riku's total buy and sell value in the current window?
Inside the rolling retention window, Sakakibara Shan Riku bought $0 and sold $2.8M based on SEC Form 4 filings.
What was Sakakibara Shan Riku's largest disclosed transaction?
The largest disclosed transaction in the current window is a sale of 8,000 BLLN shares on 2026-07-09, worth $1.0M, per SEC Form 4 filings.