Boston Partners

New 13F: Q3 2026

Boston Partners filed its 13F for the quarter ended Sep 30, 2026 on Nov 10, 2026: $22.9B in AI and semiconductor stocks; $5.2B bought and $2.1B sold against its previous quarter, at the quarter's prices.

Boston Partners declares $21.1B in 69 of the 230 AI and semiconductor companies tracked on Silicon Floor, as of Jun 30, 2026 (Form 13F): 18.8% of its $112.6B 13F portfolio. Largest positions: Amazon (0.12% of the company) and Applied Materials (0.33% of the company). Over time: $21.1B in 69 of these companies for Q2 2026, against $8.0B in 50 for Q4 2019 (13F values as filed). From Mar 31, 2026 to Jun 30, 2026, it bought $3.8B and sold $6.6B of these stocks, at the quarter's prices: a net sale of $2.8B; 8 new positions and 3 sold out.

Performance of its AI picks

The AI-stock portfolio Boston Partners declared for Q2 2026 (Form 13F), held unchanged, returned -6.6% in Q3 2026 (SMH -7.1%), ranked 1574 of 1,785 active managers. Over the last 12 months, quarter after quarter: +80.6% (SMH +87.2%), ranked 63 of 1,360 active managers. Over three years, quarter after quarter: +228.1% (SMH +325.8%), ranked 65 of 784 active managers. Over five years, quarter after quarter: +244.8% (SMH +389.8%), ranked 45 of 535 active managers. Trades made during a quarter are not visible in 13F filings: this measures its declared picks, not the return of its funds.

Largest positions

  1. Amazon (AMZN): $3.1B, 12.9M shares, 0.12% of the company, 2.7% of its portfolio (added this quarter); held since Q4 2024
  2. Applied Materials (AMAT): $1.9B, 2.6M shares, 0.33% of the company, 1.7% of its portfolio (trimmed this quarter); held since Q1 2020
  3. Flex (FLEX): $1.4B, 8.6M shares, 2.3% of the company, 1.2% of its portfolio (trimmed this quarter); held since Q4 2019 or earlier
  4. Micron (MU): $1.4B, 1.2M shares, 0.11% of the company, 1.2% of its portfolio (trimmed this quarter); held since Q4 2019 or earlier
  5. Dell (DELL): $1.4B, 3.2M shares, 0.50% of the company, 1.2% of its portfolio (trimmed this quarter); held since Q2 2023
  6. Microchip (MCHP): $1.3B, 14.5M shares, 2.7% of the company, 1.2% of its portfolio (trimmed this quarter); held since Q1 2022
  7. NXP Semiconductors (NXPI): $1.2B, 4.2M shares, 1.7% of the company, 1.0% of its portfolio (added this quarter); held since Q4 2019 or earlier
  8. Meta Platforms (META): $1.0B, 1.8M shares, 0.07% of the company, 0.91% of its portfolio (added this quarter); held since Q4 2025
  9. NVIDIA (NVDA): $798.2M, 4.0M shares, 0.02% of the company, 0.71% of its portfolio (added this quarter); held since Q3 2025
  10. Entergy (ETR): $720.8M, 6.3M shares, 1.3% of the company, 0.64% of its portfolio (added this quarter); held since Q4 2019 or earlier
  11. Cummins (CMI): $654.6M, 920,840 shares, 0.67% of the company, 0.58% of its portfolio (trimmed this quarter); held since Q3 2025
  12. Southern Company (SO): $591.1M, 6.2M shares, 0.53% of the company, 0.53% of its portfolio (added this quarter); held since Q4 2023
  13. Hubbell (HUBB): $575.2M, 1.1M shares, 2.1% of the company, 0.51% of its portfolio (added this quarter); held since Q2 2025
  14. NetApp (NTAP): $530.1M, 3.4M shares, 1.7% of the company, 0.47% of its portfolio (trimmed this quarter); held since Q1 2021
  15. Marvell (MRVL): $514.9M, 1.8M shares, 0.20% of the company, 0.46% of its portfolio (trimmed this quarter); held since Q1 2026

By sector

Biggest changes this quarter

Schedule 13D/G declarations

  • Flex (FLEX): 13G filed Nov 3, 2025: 17.9M shares as of Sep 30, 2025, 4.4% as declared
  • Flex (FLEX): 13G filed Aug 11, 2025: 19.3M shares as of Jun 30, 2025, 5.2% as declared
  • Flex (FLEX): 13G filed May 12, 2025: 18.7M shares as of Mar 31, 2025, 4.9% as declared

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