BLK
BlackRock Inc
BlackRock Inc historical holders
total: 8
Cantillon Capital Management BlackRock Inc transactions over time
- Total transactions:
- 18
- New positions:
- 1
- Added:
- 9
- Reduced:
- 8
- Held since:
- 2021 Q4
- Held for:
- 18 quarters
- Latest activity:
- 2026 Q1
William Von Mueffling has been an institutional investor in BlackRock Inc (BLK) since 2021 Q4. According to 2026 Q1 report, William Von Mueffling holds 453,282 shares with a market value of roughly $435.93M representing 2.90% of their equity portfolio. The fund/company first acquired BLK in 2021 Q4, initially purchasing 102,295 shares. Since the initial investment, Cantillon Capital Management has made 17 more transactions in this position.
Does William Von Mueffling still hold BLK?
Yes, William Von Mueffling continues to hold BlackRock Inc (BLK). According to their 2026 Q1 report, they maintain a position of 453,282 shares valued at approximately $435.93M, representing 2.90% of their equity portfolio.
When did William Von Mueffling first invest in BLK?
William Von Mueffling first invested in BlackRock Inc (BLK) in 2021 Q4 at the reported quarter-end price of $915.56 per share, acquiring 102,295 shares in their initial purchase.
What is William Von Mueffling's average cost basis for BLK?
Based on historical transaction data, William Von Mueffling's estimated cost basis for BlackRock Inc (BLK) is approximately $750.14 per share. This represents their average reported price* across all buy transactions.
Estimated cost basis*
- Weighted AVG buy price:
- $750.14
- Weighted AVG sell price:
- $934.28
BLK transactions history by Cantillon Capital Management
18 results
| Period |
% of portfolio |
Shares held after* |
Reported price* |
Value* |
% (shares) of activity |
% change to portfolio |
|---|---|---|---|---|---|---|
|
2026 Q1
|
2.90%
|
453,282
|
$961.71
|
$435,925,833
|
-11.86% (-60,970)
|
-0.32%
|
|
2025 Q4
|
2.98%
|
514,252
|
$1,070.34
|
$550,424,485
|
+0.75% (+3,850)
|
+0.02%
|
|
2025 Q3
|
3.28%
|
510,402
|
$1,165.87
|
$595,062,379
|
-1.09% (-5,625)
|
-0.04%
|
|
2025 Q2
|
3.13%
|
516,027
|
$1,049.25
|
$541,441,330
|
+10.30% (+48,173)
|
+0.29%
|
|
2025 Q1
|
2.87%
|
467,854
|
$946.48
|
$442,814,454
|
-3.29% (-15,939)
|
-0.09%
|
|
2024 Q4
|
3.00%
|
483,793
|
$1,025.11
|
$495,941,042
|
-1.00% (-4,906)
|
-0.03%
|
|
2024 Q3
|
2.84%
|
488,699
|
$949.51
|
$464,024,588
|
-4.49% (-22,990)
|
-0.15%
|
|
2024 Q2
|
2.69%
|
511,689
|
$787.32
|
$402,862,983
|
+6.84% (+32,772)
|
+0.17%
|
|
2024 Q1
|
2.51%
|
478,917
|
$833.70
|
$399,273,103
|
-2.09% (-10,207)
|
-0.06%
|
|
2023 Q4
|
2.65%
|
489,124
|
$811.80
|
$397,070,863
|
-2.51% (-12,577)
|
-0.08%
|
|
2023 Q3
|
2.41%
|
$646.49
|
+0.47% (+2,325)
|
|||
|
2023 Q2
|
2.41%
|
$691.14
|
+15.50% (+67,000)
|
|||
|
2023 Q1
|
2.36%
|
$669.12
|
-1.20% (-5,272)
|
|||
|
2022 Q4
|
2.63%
|
$708.63
|
+2.81% (+11,959)
|
|||
|
2022 Q3
|
2.12%
|
$550.28
|
+14.47% (+53,808)
|
|||
|
2022 Q2
|
1.89%
|
$609.04
|
+62.20% (+142,602)
|
|||
|
2022 Q1
|
1.25%
|
$764.17
|
+124.14% (+126,984)
|
|||
|
2021 Q4
|
0.62%
|
$915.56
|
new
|
|||
* Shares, change to shares, sold shares, shares held after: split-adjusted.
* Reported price: this doesn't represent the actual buy or sell price. It is the split-adjusted price of the security as of the last day of the reported period.
If the security is completely sold out, we show the reported split-adjusted price prior to the actual period.
If the security is completely sold out, we show the reported split-adjusted price prior to the actual period.
* Estimated cost basis: based on "Reported price*" (not earlier than 2013 Q2). Calculation starts from the latest "new buy" activity to the latest "close out" activity (if any).
* Value or Price: If the security is completely sold out, we show the reported value (or price) prior to the actual period.
* New buy or own: this means there is no earlier reporting (for us or in general). So we can't know if the actual purchase of the security happened at the reported period or earlier.