Investigate / reported ownership
BLK
Blackrock Inc
7 tracked reported owners · snapshot updated 2026-10-04. Delayed disclosures, not live holdings or an investment recommendation.
Who reports owning BLK?
Select a manager to inspect their portfolio. Reports may cover different quarters; portfolio weights describe disclosed long 13F holdings, not total economic exposure.
| #↑ | Manager | % Port. | History | Value | Shares |
|---|---|---|---|---|---|
| 1 | Joel Greenblatt | 0.6% | 7q | $1.06B | 1,097,186 |
| 2 | Jeffrey Ubben et al | 9.9% | 3q | $559M | 581,700 |
| 3 | Thomas Gayner | 1.6% | 7q | $212M | 220,200 |
| 4 | Bill Nygren | 0.1% | 7q | $43M | 44,575 |
| 5 | William Von Mueffling | 3.0% | 7q | $20M | 20,873 |
Go beyond ownership.
BlackRock provides investment-management, technology and subscription services to institutional and retail clients worldwide.
Question to investigate: Can BlackRock sustain client demand across its strategies and technology services given that revenue depends heavily on market-driven asset values and contract renewals?
Company research reviewed 2026-10-02; a dated source-linked starting point, not the investors’ stated reasons.
Understand the business and investment case →Filing dates and original SEC sources
- Joel Greenblatt · 2026Q2 · filed 2026-09-02 ↗
- Jeffrey Ubben et al · 2026Q2 · filed 2026-08-14 ↗
- Thomas Gayner · 2026Q2 · filed 2026-07-31 ↗
- Bill Nygren · 2026Q2 · filed 2026-08-14 ↗
- William Von Mueffling · 2026Q2 · filed 2026-07-29 ↗
- Dodge & Cox Funds · 2026Q2 · filed 2026-08-13 ↗
- Hillman Capital Management · 2026Q2 · filed 2026-08-14 ↗
Reported position changes
Net disclosed share changes—not individual trades or execution dates. NEW has no prior-position percentage comparison; EXIT weight refers to the previous report.
| Manager | Move | % Port. | Δ Shares | Value | Filed |
|---|---|---|---|---|---|
| William Von Mueffling | TRIM | 3.0% | -95% | $20M | Jul 29, 2026 |
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Long US 13F disclosures omit shorts and can be amended. CUSIP 09290D101. No current price, valuation or manager motive is inferred.