Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
721 institutional managers reported holding ZS for the quarter ended Mar 31, 2026. Together they hold about 54% of shares outstanding; the top 10 hold 26%. 86 opened new positions; 233 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 11.52M | 7.22% | $1.62B | added +0.8% | 2018 Q1 |
| BlackRock | 8.57M | 5.37% | $1.20B | added +9.4% | 2018 Q1 |
| First Trust Advisors LP | 3.52M | 2.20% | $493.8M | added +36.2% | 2018 Q4 |
| UBS | 3.38M | 2.12% | $474.1M | added +14.9% | 2018 Q1 |
| Goldman Sachs | 2.92M | 1.83% | $410.5M | added +21.2% | 2018 Q1 |
| State Street | 2.38M | 1.49% | $334.6M | added +2% | 2018 Q2 |
| American Century Companies INC | 2.38M | 1.49% | $334.6M | trimmed -0.7% | 2020 Q4 |
| FMR (Fidelity) | 2.19M | 1.37% | $307.4M | trimmed -51.6% | 2018 Q1 |
| Geode Capital | 2.09M | 1.31% | $292.9M | added +0.8% | 2018 Q2 |
| Pictet Asset Management Holding SA | 1.92M | 1.20% | $269.5M | added +52.5% | 2019 Q1 |
| T. Rowe Price | 1.75M | 1.09% | $245.5M | trimmed -32% | 2019 Q4 |
| T. Rowe Price Investment Management, INC. | 1.69M | 1.06% | $237.1M | added +34.3% | 2025 Q1 |
| Tiger Global | 1.58M | 0.99% | $221.7M | unchanged | 2024 Q4 |
| Victory Capital Management INC | 1.56M | 0.97% | $218.2M | added +1021.7% | 2019 Q3 |
| Morgan Stanley | 1.28M | 0.80% | $179.9M | trimmed -17.7% | 2018 Q1 |
| Two Sigma | 1.18M | 0.74% | $165.1M | added +483.9% | 2020 Q2 |
| AQR Capital | 1.02M | 0.64% | $142.6M | trimmed -36.5% | 2019 Q1 |
| Amundi | 1.01M | 0.63% | $141.5M | added +49% | 2019 Q1 |
| Invesco | 932.0k | 0.58% | $130.8M | trimmed -36.6% | 2018 Q1 |
| Wellington Management | 893.5k | 0.56% | $125.4M | added +566.3% | 2023 Q1 |
| Bank OF America CORP /DE/ | 779.2k | 0.49% | $109.4M | added +44.3% | 2018 Q1 |
| Northern Trust | 688.5k | 0.43% | $96.6M | added +1.2% | 2018 Q2 |
| Squarepoint Ops LLC | 676.7k | 0.42% | $95.0M | added +6.7% | 2022 Q2 |
| Barclays PLC | 669.3k | 0.42% | $93.9M | trimmed -8% | 2018 Q2 |
| Legal & General Group PLC | 626.3k | 0.39% | $87.9M | trimmed -3% | 2018 Q2 |
| BNP Paribas Financial Markets | 607.9k | 0.38% | $85.3M | added +39.3% | 2018 Q2 |
| Mirae Asset Global Etfs Holdings LTD. | 577.9k | 0.36% | $81.1M | added +6.7% | 2019 Q1 |
| Penserra Capital Management LLC | 555.9k | 0.35% | $78.0M | added +43.4% | 2020 Q3 |
| Janus Henderson | 541.7k | 0.34% | $76.0M | added +47% | 2019 Q3 |
| Citigroup INC | 532.3k | 0.33% | $74.7M | added +10% | 2018 Q2 |
| Charles Schwab Investment Management | 512.2k | 0.32% | $71.9M | added +4% | 2018 Q2 |
| Citadel Advisors | 510.9k | 0.32% | $71.7M | added +112.8% | 2018 Q1 |
| BNY Mellon | 494.7k | 0.31% | $69.4M | added +7.9% | 2018 Q1 |
| Champlain Investment Partners, LLC | 438.9k | 0.28% | $61.6M | added +32.3% | 2020 Q1 |
| SEB Asset Management AB | 427.9k | 0.27% | $60.1M | opened | 2026 Q1 |
| Westfield Capital Management CO LP | 427.9k | 0.27% | $60.1M | added +52.4% | 2025 Q4 |
| Voloridge Investment Management | 427.8k | 0.27% | $60.0M | opened | 2026 Q1 |
| Deutsche Bank AG\ | 421.8k | 0.26% | $59.2M | trimmed -11.5% | 2018 Q1 |
| CPP Investment Board | 396.4k | 0.25% | $55.6M | added +41.7% | 2019 Q4 |
| Ameriprise Financial INC | 392.7k | 0.25% | $55.1M | added +25.4% | 2018 Q1 |
| Artisan Partners | 385.2k | 0.24% | $54.1M | trimmed -35.1% | 2019 Q1 |
| Nomura Asset Management International INC. | 361.6k | 0.23% | $50.7M | added +30.2% | 2019 Q4 |
| Nuveen | 358.2k | 0.22% | $50.3M | trimmed -35% | 2019 Q2 |
| Voya Investment Management LLC | 353.9k | 0.22% | $49.7M | trimmed -62.8% | 2018 Q3 |
| Millennium Management | 334.9k | 0.21% | $47.0M | added +573.6% | 2019 Q2 |
| Swiss National Bank | 304.2k | 0.19% | $42.7M | added +7.9% | 2018 Q4 |
| Jacobs Levy Equity Management, INC | 296.6k | 0.19% | $41.6M | trimmed -1.5% | 2025 Q1 |
| Arrowstreet Capital | 290.7k | 0.18% | $40.8M | trimmed -32.1% | 2019 Q3 |
| Jane Street | 289.2k | 0.18% | $40.6M | added +7472.5% | 2018 Q1 |
| Ensign Peak Advisors, INC | 275.8k | 0.17% | $38.7M | trimmed -4.8% | 2019 Q4 |
Largest 50 of 721 shown; the full ranked, searchable register is at boothcheck.com/holders/ZS. 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.