BlackRock Portfolio Management LLC

Ten-percent owner · YSS, CWEN, MDIA, HESM

As of 2026-09-16, BlackRock Portfolio Management LLC has 93 Form 4 transactions on record across 4 companies — 50 in the trailing 12 months.

Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.

Reconstructed holdings

Direct: $0Indirect: $176.4M$176.4Mas of 2026-09-16
  • Direct $0
  • Indirect $176.4M
YSSindirect16,517,115 sh$135.9M
MDIAindirect35,257,690 sh$38.1M
CWENindirect78,938 sh$2.4M

Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.

Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.

Trades by company

CWEN · 64 trades
2026-08-07: Other acquisition, 1,646 sh2026-08-07: Other acquisition, 1,646 sh2026-08-07: Other acquisition, 1,646 sh2026-08-07: Other acquisition, 1,646 sh2026-07-31: Other acquisition, 217 sh2026-07-31: Other acquisition, 217 sh2026-07-09: Other acquisition, 101 sh2026-07-09: Other acquisition, 101 sh2026-06-18: Other acquisition, 945 sh2026-06-18: Other acquisition, 945 sh2026-06-12: Other acquisition, 438 sh2026-06-12: Other acquisition, 438 sh2026-05-01: Other acquisition, 6,461 sh2026-05-01: Other acquisition, 6,461 sh2026-04-29: Other acquisition, 21,841 sh2026-04-29: Other acquisition, 21,841 sh2026-04-29: Other acquisition, 21,841 sh2026-04-29: Other acquisition, 21,841 sh2026-04-01: Other acquisition, 435,552 sh ($17.4M)2026-04-01: Other acquisition, 99,661 sh ($4.0M)2026-04-01: Other acquisition, 42,738,750 sh2026-04-01: Other acquisition, 42,738,750 sh2026-04-01: Other acquisition, 42,738,750 sh2026-04-01: Other acquisition, 42,738,750 sh2026-03-31: Conversion, 215,000 sh ($0)2026-03-31: Conversion, 215,000 sh2026-03-31: Conversion, 215,000 sh2026-03-26: Other acquisition, 1,091 sh2026-03-26: Other acquisition, 1,091 sh2026-03-13: Other acquisition, 493 sh2026-03-13: Other acquisition, 493 sh2026-02-23: Other acquisition, 129 sh ($5K)2026-02-23: Other acquisition, 875 sh2026-02-23: Other acquisition, 875 sh2025-12-12: Other acquisition, 1,737 sh2025-12-12: Other acquisition, 1,737 sh2025-10-28: Other acquisition, 657 sh2025-10-28: Other acquisition, 657 sh2025-10-01: Other acquisition, 63,475 sh ($1.9M)2025-08-15: Other acquisition, 4,368 sh2025-08-15: Other acquisition, 4,368 sh2025-08-01: Other acquisition, 821 sh2025-08-01: Other acquisition, 821 sh2025-07-01: Other acquisition, 213 sh2025-07-01: Other acquisition, 213 sh2025-05-12: Other acquisition, 821 sh2025-05-12: Other acquisition, 821 sh2025-05-02: Other acquisition, 18,210 sh2025-05-02: Other acquisition, 18,210 sh2025-04-25: Other acquisition, 4,226 sh2025-04-25: Other acquisition, 4,226 sh2025-04-18: Other acquisition, 11,886 sh2025-04-18: Other acquisition, 11,886 sh2025-04-15: Other acquisition, 95 sh ($3K)2025-04-04: Other acquisition, 578 sh2025-04-04: Other acquisition, 578 sh2025-04-01: Other acquisition, 550,283 sh ($16.8M)2025-04-01: Other acquisition, 124,151 sh ($3.8M)2025-03-31: Conversion, 385,608 sh ($0)2025-03-31: Conversion, 385,608 sh2025-03-31: Conversion, 385,608 sh2025-02-18: Other acquisition, 1,183 sh ($31K)2025-02-14: Other acquisition, 958 sh2025-02-14: Other acquisition, 958 sh
HESM · 14 trades
2025-05-30: Sale, 15,022,517 sh ($553.7M)2025-05-30: Conversion, 14,573,517 sh ($537.2M)2025-05-30: Conversion, 14,573,517 sh ($0)2025-05-30: Other acquisition, 14,573,517 sh ($0)2025-05-09: Disposition, 3,112,886 sh ($114.8M)2025-05-09: Other acquisition, 3,112,886 sh ($0)2025-02-19: Sale, 1,650,000 sh ($64.5M)2025-02-19: Other acquisition, 1,650,000 sh ($0)2025-02-19: Conversion, 1,650,000 sh ($0)2025-02-19: Conversion, 1,650,000 sh ($0)2025-02-12: Sale, 11,000,000 sh ($430.2M)2025-02-12: Other acquisition, 11,000,000 sh ($0)2025-02-12: Conversion, 11,000,000 sh ($0)2025-02-12: Conversion, 11,000,000 sh ($0)
YSS · 11 trades
2026-08-07: Sale, 200,170 sh ($2.2M)2026-08-06: Sale, 201,504 sh ($2.3M)2026-08-05: Sale, 116,162 sh ($1.6M)2026-08-05: Sale, 11,784 sh ($180K)2026-08-04: Sale, 456,310 sh ($7.1M)2026-08-04: Sale, 77,743 sh ($1.2M)2026-08-03: Sale, 13,754 sh ($207K)2026-07-31: Sale, 35,574 sh ($539K)2026-07-30: Sale, 140,823 sh ($2.1M)2026-07-29: Sale, 63,390 sh ($971K)2026-01-30: Purchase, 752,500 sh ($25.6M)
MDIA · 4 trades
2025-09-05: Sale, 214 sh ($282)2025-09-05: Exercise, 28,206,152 sh ($0)2025-09-05: Exercise, 28,206,152 sh2025-09-05: Exercise, 28,206,152 sh

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-08-07YSSSale200,170 @ $10.99$2.2M−1.2% of holding16,517,115Form 4
2026-08-06YSSSale201,504 @ $11.60$2.3M−1.2% of holding16,717,285Form 4
2026-08-05YSSSale116,162 @ $13.49$1.6M−0.7% of holding16,943,178Form 4
2026-08-05YSSSale11,784 @ $15.28$180K−0.1% of holding16,931,394Form 4
2026-08-04YSSSale456,310 @ $15.58$7.1M−2.6% of holding17,059,340Form 4
2026-08-04YSSSale77,743 @ $15.02$1.2M−0.4% of holding17,515,650Form 4
2026-08-03YSSSale13,754 @ $15.03$207K−0.1% of holding17,593,393Form 4
2026-07-31YSSSale35,574 @ $15.14$539K−0.2% of holding17,607,147Form 4
2026-07-30YSSSale140,823 @ $15.18$2.1M−0.8% of holding17,642,721Form 4
2026-07-29YSSSale63,390 @ $15.31$971K−0.4% of holding17,783,544Form 4
2026-01-30YSSPurchase752,500 @ $34.00$25.6M+4.4% of holding17,846,934Form 4
2025-09-05MDIASale214 @ $1.32$282−0.0% of holding35,257,476Form 4
2025-05-30HESMSale15,022,517 @ $36.86$553.7M−100.0% of holding0Form 4
2025-02-19HESMSale1,650,000 @ $39.11$64.5M−100.0% of holding0Form 4
2025-02-12HESMSale11,000,000 @ $39.11$430.2M−100.0% of holding0Form 4
78 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-08-07CWENOther acquisition1,64678,938Form 4
2026-08-07CWENOther acquisition1,64678,938Form 4
2026-08-07CWENOther acquisition1,64678,938Form 4
2026-08-07CWENOther acquisition1,64678,938Form 4
2026-07-31CWENOther acquisition21777,292Form 4
2026-07-31CWENOther acquisition21777,292Form 4
2026-07-09CWENOther acquisition10177,075Form 4
2026-07-09CWENOther acquisition10177,075Form 4
2026-06-18CWENOther acquisition94576,974Form 4
2026-06-18CWENOther acquisition94576,974Form 4
2026-06-12CWENOther acquisition43876,029Form 4
2026-06-12CWENOther acquisition43876,029Form 4
2026-05-01CWENOther acquisition6,46175,591Form 4
2026-05-01CWENOther acquisition6,46175,591Form 4
2026-04-29CWENOther acquisition21,8410Form 4
2026-04-29CWENOther acquisition21,84169,130Form 4
2026-04-29CWENOther acquisition21,8410Form 4
2026-04-29CWENOther acquisition21,84169,130Form 4
2026-04-01CWENOther acquisition435,55247,289Form 4
2026-04-01CWENOther acquisition99,661482,841Form 4
2026-04-01CWENOther acquisition42,738,75042,738,750Form 4
2026-04-01CWENOther acquisition42,738,7500Form 4
2026-04-01CWENOther acquisition42,738,75042,738,750Form 4
2026-04-01CWENOther acquisition42,738,7500Form 4
2026-03-31CWENConversion215,00041,361,142Form 4
2026-03-31CWENConversion215,000383,180Form 4
2026-03-31CWENConversion215,000383,180Form 4
2026-03-26CWENOther acquisition1,091168,180Form 4
2026-03-26CWENOther acquisition1,091168,180Form 4
2026-03-13CWENOther acquisition493167,089Form 4
2026-03-13CWENOther acquisition493167,089Form 4
2026-02-23CWENOther acquisition129165,721Form 4
2026-02-23CWENOther acquisition875166,596Form 4
2026-02-23CWENOther acquisition875166,596Form 4
2025-12-12CWENOther acquisition1,737165,592Form 4
2025-12-12CWENOther acquisition1,737165,592Form 4
2025-10-28CWENOther acquisition657163,855Form 4
2025-10-28CWENOther acquisition657163,855Form 4
2025-10-01CWENOther acquisition63,475163,198Form 4
2025-09-05MDIAExercise28,206,1520Form 4

Source: SEC Form 4 filings. Each row links to its original filing.

Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.