Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
294 institutional managers reported holding TENB for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 53%. 58 opened new positions; 41 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 16.01M | 13.61% | $270.8M | added +3.8% | 2018 Q3 |
| BlackRock | 13.50M | 11.47% | $228.2M | added +5.5% | 2018 Q3 |
| Ameriprise Financial INC | 8.50M | 7.22% | $143.7M | added +29.5% | 2020 Q2 |
| Shapiro Capital Management LLC (focused) | 4.15M | 3.53% | $70.2M | added +43.5% | 2024 Q3 |
| Arrowstreet Capital | 3.73M | 3.17% | $63.1M | added +175.1% | 2025 Q1 |
| FMR (Fidelity) | 3.57M | 3.03% | $60.4M | added +139.9% | 2018 Q3 |
| Pacer Advisors, INC. | 3.53M | 3.00% | $59.6M | trimmed -24.3% | 2022 Q2 |
| Penserra Capital Management LLC | 3.39M | 2.88% | $57.3M | added +22.9% | 2024 Q1 |
| State Street | 3.09M | 2.62% | $52.2M | added +2.3% | 2018 Q3 |
| Geode Capital | 2.92M | 2.48% | $49.5M | unchanged | 2018 Q3 |
| First Trust Advisors LP | 2.69M | 2.29% | $45.5M | trimmed -36.6% | 2018 Q3 |
| Mackenzie Financial CORP | 2.48M | 2.10% | $41.9M | trimmed -3.4% | 2019 Q2 |
| Morgan Stanley | 2.21M | 1.88% | $37.3M | trimmed -19.1% | 2018 Q3 |
| Goldman Sachs | 1.98M | 1.68% | $33.5M | added +100.3% | 2018 Q3 |
| Mirae Asset Global Etfs Holdings LTD. | 1.98M | 1.68% | $33.5M | added +6.9% | 2018 Q3 |
| Barclays PLC | 1.91M | 1.62% | $32.2M | trimmed -17.6% | 2018 Q3 |
| Manufacturers Life Insurance Company, THE | 1.85M | 1.57% | $31.3M | added +16.1% | 2018 Q3 |
| Jacobs Levy Equity Management, INC | 1.84M | 1.56% | $31.1M | opened | 2026 Q1 |
| Alyeska Investment Group | 1.74M | 1.48% | $29.4M | trimmed -4.7% | 2023 Q2 |
| UBS | 1.61M | 1.37% | $27.2M | trimmed -52% | 2018 Q3 |
| AQR Capital | 1.58M | 1.34% | $26.8M | added +179.7% | 2020 Q3 |
| Renaissance Technologies | 1.26M | 1.07% | $21.3M | added +140.8% | 2025 Q2 |
| Two Sigma | 1.25M | 1.07% | $21.2M | added +1.7% | 2019 Q1 |
| Jane Street | 1.14M | 0.97% | $19.4M | added +269.4% | 2020 Q2 |
| SEB Asset Management AB | 1.12M | 0.95% | $18.9M | opened | 2026 Q1 |
| Federated Hermes, INC. | 1.10M | 0.94% | $18.6M | added +52.7% | 2022 Q4 |
| Northern Trust | 1.08M | 0.92% | $18.3M | added +1.4% | 2018 Q3 |
| Canada Life Assurance CO | 1.02M | 0.86% | $17.2M | added +68.6% | 2019 Q2 |
| Bank OF America CORP /DE/ | 996.8k | 0.85% | $16.9M | added +2% | 2018 Q3 |
| Charles Schwab Investment Management | 979.7k | 0.83% | $16.6M | trimmed -2.8% | 2018 Q3 |
| HRT Financial LP | 953.9k | 0.81% | $16.1M | added +163.8% | 2025 Q2 |
| Balyasny Asset Management | 950.7k | 0.81% | $16.1M | added +71.2% | 2024 Q2 |
| Nuveen | 898.2k | 0.76% | $15.2M | trimmed -11.7% | 2019 Q2 |
| BNY Mellon | 821.2k | 0.70% | $13.9M | added +7% | 2018 Q3 |
| Dimensional Fund Advisors | 817.4k | 0.69% | $13.8M | added +231.4% | 2023 Q1 |
| Citadel Advisors | 751.9k | 0.64% | $12.7M | added +15.2% | 2018 Q3 |
| Trexquant Investment LP | 709.9k | 0.60% | $12.0M | added +143.7% | 2022 Q4 |
| BNP Paribas Financial Markets | 676.9k | 0.57% | $11.4M | trimmed -8% | 2018 Q3 |
| Voya Investment Management LLC | 648.3k | 0.55% | $11.0M | trimmed -41% | 2019 Q1 |
| Qube Research & Technologies LTD | 640.5k | 0.54% | $10.8M | trimmed -30.8% | 2023 Q3 |
| Stephens Investment Management Group LLC | 633.1k | 0.54% | $10.7M | trimmed -42.5% | 2023 Q1 |
| Russell Investments Group, LTD. | 575.9k | 0.49% | $9.7M | added +1582.7% | 2019 Q1 |
| Millennium Management | 573.3k | 0.49% | $9.7M | trimmed -30.2% | 2020 Q4 |
| Susquehanna International Group | 527.1k | 0.45% | $8.9M | added +455.8% | 2019 Q3 |
| Assenagon Asset Management S.a. | 520.8k | 0.44% | $8.8M | trimmed -67.9% | 2024 Q4 |
| Archon Capital Management LLC (focused) | 519.0k | 0.44% | $8.8M | opened | 2026 Q1 |
| IEQ Capital, LLC | 504.1k | 0.43% | $8.5M | added +44.1% | 2019 Q4 |
| Deutsche Bank AG\ | 490.6k | 0.42% | $8.3M | trimmed -12.5% | 2018 Q3 |
| ExodusPoint | 456.4k | 0.39% | $7.7M | added +148.1% | 2025 Q3 |
| Pinnacle Associates LTD | 417.2k | 0.35% | $7.1M | added +160.9% | 2019 Q3 |
Largest 50 of 294 shown; the full ranked, searchable register is at boothcheck.com/holders/TENB. 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.