Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
1,566 institutional managers reported holding ZTS for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 43%. 141 opened new positions; 226 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 54.40M | 12.88% | $6.43B | added +13.7% | ≤2013 |
| BlackRock | 35.58M | 8.42% | $4.20B | trimmed -4.7% | ≤2013 |
| State Street | 19.32M | 4.58% | $2.28B | trimmed -2.4% | ≤2013 |
| State Farm Mutual Automobile Insurance CO | 15.89M | 3.76% | $1.88B | unchanged | ≤2013 |
| Morgan Stanley | 14.15M | 3.35% | $1.67B | trimmed -8.5% | ≤2013 |
| Geode Capital | 11.35M | 2.69% | $1.34B | unchanged | ≤2013 |
| Wellington Management | 10.15M | 2.40% | $1.20B | trimmed -10.9% | ≤2013 |
| UBS | 7.20M | 1.70% | $850.2M | added +8.2% | ≤2013 |
| Nordea Investment Management AB | 5.87M | 1.39% | $692.8M | added +18.9% | ≤2013 |
| Northern Trust | 5.55M | 1.31% | $655.1M | trimmed -3.5% | ≤2013 |
| Deutsche Bank AG\ | 5.53M | 1.31% | $653.4M | unchanged | ≤2013 |
| Wells Fargo & COMPANY/MN | 5.49M | 1.30% | $648.6M | added +14.6% | ≤2013 |
| FIL LTD | 5.49M | 1.30% | $648.1M | added +157.1% | 2017 Q2 |
| Bank OF America CORP /DE/ | 4.83M | 1.14% | $570.7M | added +7.3% | ≤2013 |
| Mitsubishi UFJ Asset Management CO., LTD. | 4.47M | 1.06% | $528.3M | unchanged | ≤2013 |
| Polen Capital | 4.22M | 1.00% | $498.8M | trimmed -24.1% | 2017 Q4 |
| Brown Advisory INC | 4.19M | 0.99% | $494.7M | added +3.5% | 2014 Q4 |
| VAN ECK Associates CORP | 3.95M | 0.94% | $466.4M | added +65.4% | 2013 Q3 |
| BNY Mellon | 3.90M | 0.92% | $460.6M | trimmed -9.4% | ≤2013 |
| Fundsmith (focused) | 3.88M | 0.92% | $458.0M | trimmed -0.6% | 2020 Q4 |
| Goldman Sachs | 3.73M | 0.88% | $440.7M | added +8.9% | ≤2013 |
| Charles Schwab Investment Management | 3.72M | 0.88% | $439.1M | added +1.8% | ≤2013 |
| Janus Henderson | 3.70M | 0.88% | $437.2M | trimmed -4.7% | ≤2013 |
| Legal & General Group PLC | 3.65M | 0.86% | $431.2M | added +2.7% | ≤2013 |
| AllianceBernstein | 3.63M | 0.86% | $429.1M | trimmed -1.8% | ≤2013 |
| Invesco | 3.54M | 0.84% | $418.2M | added +5.3% | ≤2013 |
| Raymond James Financial INC | 3.17M | 0.75% | $374.0M | added +244% | 2014 Q2 |
| Amundi | 3.17M | 0.75% | $374.0M | trimmed -20.9% | ≤2013 |
| Swedbank Robur | 3.00M | 0.71% | $354.8M | added +9.9% | 2021 Q1 |
| Nuveen | 2.97M | 0.70% | $350.3M | trimmed -9.7% | ≤2013 |
| Diamond Hill Capital Management INC | 2.93M | 0.69% | $345.8M | trimmed -7.3% | 2025 Q3 |
| Unisphere Establishment (focused) | 2.80M | 0.66% | $330.7M | trimmed -41.7% | 2023 Q4 |
| Dimensional Fund Advisors | 2.77M | 0.66% | $327.3M | trimmed -2.2% | ≤2013 |
| Ruane Cunniff (Sequoia) (focused) | 2.43M | 0.57% | $286.4M | opened | 2026 Q1 |
| BNP Paribas Financial Markets | 2.30M | 0.54% | $271.4M | trimmed -2.9% | ≤2013 |
| Southpoint Capital Advisors LP (focused) | 2.20M | 0.52% | $259.9M | added +340% | 2025 Q4 |
| Hsbc Holdings PLC | 2.06M | 0.49% | $243.7M | added +55.8% | ≤2013 |
| Arrowstreet Capital | 1.98M | 0.47% | $233.3M | trimmed -35% | 2024 Q3 |
| Royal Bank OF Canada | 1.97M | 0.47% | $233.2M | added +20.8% | ≤2013 |
| BLS Capital Fondsmaeglerselskab A/S (focused) | 1.96M | 0.46% | $231.0M | trimmed -1.1% | 2025 Q1 |
| Pictet Asset Management Holding SA | 1.92M | 0.46% | $227.3M | trimmed -20% | ≤2013 |
| Banque Pictet & CIE SA | 1.82M | 0.43% | $215.0M | trimmed -23.5% | 2017 Q2 |
| Worldquant Millennium Advisors LLC | 1.82M | 0.43% | $214.8M | added +1214% | 2025 Q1 |
| Barclays PLC | 1.81M | 0.43% | $213.8M | added +74.2% | ≤2013 |
| Cibc Bancorp USA INC. | 1.69M | 0.40% | $199.2M | trimmed -1.6% | 2014 Q1 |
| Montrusco Bolton Investments INC. | 1.67M | 0.39% | $196.8M | trimmed -23.1% | 2022 Q4 |
| Millennium Management | 1.65M | 0.39% | $194.9M | added +373.7% | ≤2013 |
| Ameriprise Financial INC | 1.61M | 0.38% | $190.2M | trimmed -16.8% | ≤2013 |
| TD Asset Management INC | 1.57M | 0.37% | $185.3M | unchanged | ≤2013 |
| Employees Provident Fund Board | 1.54M | 0.36% | $181.6M | unchanged | 2023 Q1 |
Largest 50 of 1,566 shown; the full ranked, searchable register is at boothcheck.com/holders/ZTS. 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.