BlackRock Portfolio Management LLC
SEC Form 4 insider trading activity
BlackRock Portfolio Management LLC has filed 20 SEC Form 4 filings (34 transaction rows) across 2 companies, including CWEN, YSS, with disclosures dating back to 2025. 19 of those filings fall inside the rolling window. Most recent filing: Aug 11, 2026.
On the most recent filing, BlackRock Portfolio Management LLC is listed as 10% Owner at York Space Systems Inc. Inside the rolling window, BlackRock Portfolio Management LLC reported 1 open-market purchase totaling $25.6M in YSS and 8 open-market sales totaling $27.1M in YSS. The largest disclosed transaction in the window is a purchase of 752,500 YSS shares on Jan 30, 2026, worth $25.6M.
Companies traded
Other insiders at CWEN
Insider Buying
$25.6M
reported purchases (SEC code P)
Insider Selling
$27.1M
reported sales (SEC code S)
Companies
2
in the rolling window
| Source | |||||||
|---|---|---|---|---|---|---|---|
| YSS | 10% Owner | Sale | 201,504 | $2.3M | Aug 10 | SEC ↗ | |
| YSS | 10% Owner | Sale | 200,170 | $2.2M | Aug 10 | SEC ↗ | |
| YSS | 10% Owner | Sale | 1,080,611 | $16.7M | Aug 10 | SEC ↗ | |
| YSS | 10% Owner | Sale | 139,830 | $1.9M | Aug 10 | SEC ↗ | |
| YSS | 10% Owner | Sale | 35,574 | $539K | Aug 4 | SEC ↗ | |
| YSS | 10% Owner | Sale | 13,754 | $207K | Aug 4 | SEC ↗ | |
| YSS | 10% Owner | Sale | 63,390 | $971K | Jul 31 | SEC ↗ | |
| YSS | 10% Owner | Sale | 140,823 | $2.1M | Jul 31 | SEC ↗ | |
| YSS | 10% Owner | Purchase | 752,500 | $25.6M | Feb 3 | SEC ↗ |
Earlier trades
Open-market purchases and sales filed before the rolling 365-day window, kept from the original Form 4 filings.
| Date | Ticker | Type | Value |
|---|---|---|---|
| Sep 5, 2025 | MDIA | Sale | $282 |
Frequently asked questions
How many SEC Form 4 filings has BlackRock Portfolio Management LLC made?
BlackRock Portfolio Management LLC has filed 20 SEC Form 4 filings (34 transaction rows) across 2 companies, including CWEN, YSS since 2025.
Which companies does BlackRock Portfolio Management LLC trade?
BlackRock Portfolio Management LLC has filed SEC Form 4 disclosures for 2 companies, including CWEN, YSS.
When was BlackRock Portfolio Management LLC's most recent SEC Form 4 filing?
BlackRock Portfolio Management LLC's most recent SEC Form 4 filing on Tracefour is dated Aug 11, 2026.
What is BlackRock Portfolio Management LLC's total buy and sell value in the current window?
Inside the rolling retention window, BlackRock Portfolio Management LLC bought $25.6M and sold $27.1M based on SEC Form 4 filings.
What was BlackRock Portfolio Management LLC's largest disclosed transaction?
The largest disclosed transaction in the current window is a purchase of 752,500 YSS shares on 2026-01-30, worth $25.6M, per SEC Form 4 filings.