BlackRock Portfolio Management LLC

10% OwnerCIK 0002052113

Total Volume

$75.6M

15 filings

Purchases

$25.6M

1 buy txns

Sales

$28.6M

15 sell txns

Net Activity

-$3.1M

net sold

Largest Purchase

$25.6M

Yellowstone Midco Holdings II, LLC (YSS)

Feb 3

Profile

Filings: 15
Buy transactions: 1
Sell transactions: 15
Companies: 3
Active: 2025–2026

BlackRock Portfolio Management LLC, 10% Owner, has filed 15 SEC reports (2025–2026), spread across 3 companies, totaling $75.6M in disclosed volume. Weighing $25.6M bought versus $28.6M sold, the history is a roughly balanced mix of buying and selling. The largest single open-market purchase on record is $25.6M in Yellowstone Midco Holdings II, LLC. Data is sourced from official SEC Form 3, 4, and 5 filings.

Associated Companies

York Space Systems Inc. (YSS)

7 filings

$54.2M

$25.6M bought

Clearway Energy, Inc. (CWEN)

7 filings

$21.4M

Mediaco Holding Inc. (MDIA)

1 filing

$282

Trades on the Price Chart

York Space Systems Inc. (YSS)

YSS price with this insider's trades marked

View all insider activity on YSS →

Price data is delayed and provided for context only — not investment advice.

Trading History

15 loaded


Aug 11	CWEN Clearway Energy, Inc.	BlackRock Portfolio Management LLC	10% Owner	Other	$0
Aug 10	YSS York Space Systems Inc.	BlackRock Portfolio Management LLC	10% Owner	Sell	$4.5M
Aug 10	YSS York Space Systems Inc.	BlackRock Portfolio Management LLC	10% Owner	Sell	$10.2M
Aug 6	YSS York Space Systems Inc.	BlackRock Portfolio Management LLC	10% Owner	Sell	$10.0M
Aug 4	CWEN Clearway Energy, Inc.	BlackRock Portfolio Management LLC	10% Owner	Other	$0
Aug 4	YSS York Space Systems Inc.	BlackRock Portfolio Management LLC	10% Owner	Sell	$745.3K
Jul 31	YSS York Space Systems Inc.	BlackRock Portfolio Management LLC	10% Owner	Sell	$3.1M
Jul 13	CWEN Clearway Energy, Inc.	BlackRock Portfolio Management LLC	10% Owner	Other	$0
Jun 23	CWEN Clearway Energy, Inc.	BlackRock Portfolio Management LLC	10% Owner	Other	$0
Jun 16	CWEN Clearway Energy, Inc.	BlackRock Portfolio Management LLC	10% Owner	Other	$0
Apr 2	CWEN Clearway Energy, Inc.	BlackRock Portfolio Management LLC	10% Owner	Conversion	$21.4M
Mar 30	CWEN Clearway Energy, Inc.	BlackRock Portfolio Management LLC	10% Owner	Other	$0
Feb 3	YSS Yellowstone Midco Holdings II, LLC	BlackRock Portfolio Management LLC	Insider	Buy	$25.6M
Jan 29	YSS Yellowstone Midco Holdings II, LLC	BlackRock Portfolio Management LLC	Insider	Other	$0
Sep 8	MDIA Mediaco Holding Inc.	BlackRock Portfolio Management LLC	10% Owner	Sell	$282

15 filings