Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
1,987 institutional managers reported holding MCK for the quarter ended Mar 31, 2026. Together they hold about 83% of shares outstanding; the top 10 hold 39%. 180 opened new positions; 159 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 12.12M | 9.80% | $10.49B | unchanged | ≤2013 |
| BlackRock | 11.42M | 9.23% | $9.88B | trimmed -0.6% | ≤2013 |
| State Street | 5.73M | 4.63% | $4.96B | trimmed -0.8% | ≤2013 |
| FMR (Fidelity) | 3.60M | 2.91% | $3.12B | added +12.4% | ≤2013 |
| Franklin Resources | 3.06M | 2.48% | $2.65B | added +8.4% | ≤2013 |
| Geode Capital | 2.90M | 2.35% | $2.51B | added +1.6% | ≤2013 |
| MFS Investment Management | 2.90M | 2.35% | $2.51B | trimmed -15.8% | ≤2013 |
| Morgan Stanley | 2.30M | 1.86% | $1.99B | trimmed -3.8% | ≤2013 |
| AllianceBernstein | 2.24M | 1.81% | $1.94B | trimmed -9.9% | ≤2013 |
| Bank OF America CORP /DE/ | 1.54M | 1.24% | $1.33B | added +2.4% | ≤2013 |
| UBS | 1.50M | 1.21% | $1.30B | trimmed -10.8% | ≤2013 |
| Invesco | 1.49M | 1.21% | $1.29B | added +41.7% | ≤2013 |
| Northern Trust | 1.46M | 1.18% | $1.26B | trimmed -1.9% | ≤2013 |
| Arrowstreet Capital | 1.31M | 1.06% | $1.14B | trimmed -4.7% | 2019 Q2 |
| Goldman Sachs | 1.31M | 1.05% | $1.13B | added +40.9% | ≤2013 |
| Royal Bank OF Canada | 1.28M | 1.04% | $1.11B | trimmed -10.9% | ≤2013 |
| Boston Partners | 1.16M | 0.93% | $999.1M | trimmed -6.1% | ≤2013 |
| DZ Bank AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 1.05M | 0.85% | $905.7M | added +30.1% | 2019 Q3 |
| Swedbank Robur | 1.01M | 0.81% | $869.9M | added +13.5% | 2021 Q1 |
| Nordea Investment Management AB | 988.0k | 0.80% | $854.7M | trimmed -7.8% | ≤2013 |
| Charles Schwab Investment Management | 945.6k | 0.76% | $817.9M | added +1.1% | ≤2013 |
| WCM Investment Management | 932.1k | 0.75% | $806.3M | trimmed -1.3% | 2022 Q3 |
| Legal & General Group PLC | 916.7k | 0.74% | $793.0M | added +2.6% | ≤2013 |
| AQR Capital | 907.5k | 0.73% | $785.0M | trimmed -1.2% | ≤2013 |
| BNY Mellon | 825.6k | 0.67% | $714.2M | trimmed -3.4% | ≤2013 |
| Manufacturers Life Insurance Company, THE | 812.4k | 0.66% | $702.8M | trimmed -16% | ≤2013 |
| T. Rowe Price | 794.7k | 0.64% | $687.4M | trimmed -5.1% | ≤2013 |
| Acadian Asset Management | 721.1k | 0.58% | $623.8M | added +0.5% | ≤2013 |
| Barclays PLC | 712.8k | 0.58% | $616.6M | added +159.1% | ≤2013 |
| TD Asset Management INC | 710.4k | 0.57% | $614.5M | trimmed -5.7% | ≤2013 |
| Janus Henderson | 628.9k | 0.51% | $544.1M | trimmed -12.4% | ≤2013 |
| Amundi | 623.7k | 0.50% | $539.6M | added +33.6% | 2017 Q4 |
| Nuveen | 612.0k | 0.49% | $529.4M | added +2.3% | ≤2013 |
| Ameriprise Financial INC | 575.9k | 0.47% | $498.2M | unchanged | ≤2013 |
| Wells Fargo & COMPANY/MN | 459.7k | 0.37% | $397.6M | added +5.2% | ≤2013 |
| Deutsche Bank AG\ | 459.1k | 0.37% | $397.1M | added +1.9% | ≤2013 |
| Robeco Institutional Asset Management B.v. | 458.2k | 0.37% | $396.4M | added +5.9% | ≤2013 |
| Bank OF Montreal /CAN/ | 427.0k | 0.34% | $369.4M | added +14.7% | ≤2013 |
| Envestnet Asset Management INC | 424.8k | 0.34% | $367.5M | added +30.2% | ≤2013 |
| Voya Investment Management LLC | 420.2k | 0.34% | $363.5M | trimmed -37.1% | ≤2013 |
| National Pension Service | 396.2k | 0.32% | $342.7M | unchanged | 2014 Q3 |
| Lone Pine Capital (focused) | 392.2k | 0.32% | $339.3M | opened | 2026 Q1 |
| Winslow Capital Management, LLC | 379.6k | 0.31% | $328.3M | trimmed -13.2% | 2025 Q4 |
| BNP Paribas Financial Markets | 369.8k | 0.30% | $319.9M | trimmed -28.6% | ≤2013 |
| Mitsubishi UFJ Asset Management CO., LTD. | 364.1k | 0.29% | $315.0M | added +0.6% | ≤2013 |
| Swiss National Bank | 362.3k | 0.29% | $313.4M | added +6.3% | ≤2013 |
| Dimensional Fund Advisors | 356.4k | 0.29% | $308.3M | added +1.2% | ≤2013 |
| SurgoCap Partners LP (focused) | 348.7k | 0.28% | $301.7M | trimmed -16.8% | 2023 Q4 |
| Raymond James Financial INC | 331.4k | 0.27% | $286.7M | added +13.9% | ≤2013 |
| CalPERS | 324.0k | 0.26% | $280.3M | trimmed -9.8% | ≤2013 |
Largest 50 of 1,987 shown; the full ranked, searchable register is at boothcheck.com/holders/MCK. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.