Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
278 institutional managers reported holding ABM for the quarter ended Mar 31, 2026. Together they hold about 92% of shares outstanding; the top 10 hold 56%. 35 opened new positions; 62 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 8.88M | 14.63% | $341.1M | trimmed -1.5% | ≤2013 |
| Vanguard Group | 7.17M | 11.81% | $275.2M | trimmed -1.1% | ≤2013 |
| Dimensional Fund Advisors | 4.08M | 6.71% | $156.5M | added +0.6% | ≤2013 |
| State Street | 3.03M | 5.00% | $116.5M | trimmed -1.7% | 2015 Q4 |
| Harris Associates (Oakmark) | 2.88M | 4.75% | $110.7M | added +6.3% | 2022 Q2 |
| Invesco | 1.72M | 2.83% | $66.0M | added +21.5% | ≤2013 |
| Nordea Investment Management AB | 1.67M | 2.76% | $64.3M | added +37.2% | 2025 Q2 |
| LSV Asset Management | 1.64M | 2.70% | $62.8M | added +32.7% | 2021 Q1 |
| Ameriprise Financial INC | 1.60M | 2.63% | $61.4M | added +20% | ≤2013 |
| Pzena Investment Management | 1.52M | 2.51% | $58.5M | added +30% | 2024 Q2 |
| Nomura Asset Management International INC. | 1.47M | 2.43% | $56.6M | trimmed -9.9% | 2025 Q4 |
| Geode Capital | 1.46M | 2.40% | $55.9M | unchanged | ≤2013 |
| Fuller & Thaler Asset Management, INC. | 1.06M | 1.75% | $40.8M | trimmed -3.6% | 2023 Q1 |
| Boston Partners | 770.3k | 1.27% | $29.6M | trimmed -2.5% | ≤2013 |
| Morgan Stanley | 730.6k | 1.20% | $28.1M | added +0.8% | ≤2013 |
| Charles Schwab Investment Management | 698.5k | 1.15% | $26.8M | trimmed -3.1% | ≤2013 |
| Northern Trust | 637.2k | 1.05% | $24.5M | added +2.9% | ≤2013 |
| Vulcan Value Partners, LLC (focused) | 630.3k | 1.04% | $24.2M | trimmed -4.3% | 2020 Q3 |
| Goldman Sachs | 580.3k | 0.96% | $22.3M | added +32.2% | ≤2013 |
| Invenomic Capital Management LP | 559.2k | 0.92% | $21.5M | trimmed -11.2% | 2025 Q2 |
| Bank OF America CORP /DE/ | 553.1k | 0.91% | $21.2M | trimmed -4.6% | ≤2013 |
| Citadel Advisors | 521.9k | 0.86% | $20.0M | added +141.6% | 2019 Q3 |
| Qube Research & Technologies LTD | 518.6k | 0.85% | $19.9M | added +8.6% | 2022 Q3 |
| William Blair Investment Management, LLC | 487.7k | 0.80% | $18.7M | added +3.5% | 2021 Q2 |
| Gemmer Asset Management LLC | 468.5k | 0.77% | $18.0M | unchanged | 2016 Q4 |
| UBS | 371.7k | 0.61% | $14.3M | added +24.8% | ≤2013 |
| AQR Capital | 368.7k | 0.61% | $14.2M | added +114.4% | 2019 Q2 |
| BNY Mellon | 353.5k | 0.58% | $13.6M | trimmed -6.3% | ≤2013 |
| FMR (Fidelity) | 324.6k | 0.54% | $12.5M | added +10.2% | 2016 Q4 |
| Barclays PLC | 322.3k | 0.53% | $12.4M | trimmed -15% | ≤2013 |
| Millennium Management | 300.1k | 0.49% | $11.5M | trimmed -27.2% | ≤2013 |
| First Eagle Investment Management | 293.0k | 0.48% | $11.3M | added +62.6% | 2025 Q4 |
| Principal Financial Group INC | 284.8k | 0.47% | $10.9M | trimmed -2.4% | ≤2013 |
| Victory Capital Management INC | 266.9k | 0.44% | $10.2M | added +972.7% | 2018 Q4 |
| Man Group | 253.1k | 0.42% | $9.7M | added +61.4% | 2020 Q4 |
| Two Sigma | 251.3k | 0.41% | $9.6M | trimmed -19.5% | 2023 Q1 |
| D. E. Shaw | 244.1k | 0.40% | $9.4M | trimmed -47.9% | 2023 Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 242.5k | 0.40% | $9.3M | added +7.9% | 2024 Q4 |
| Hotchkis & Wiley Capital Management LLC | 224.4k | 0.37% | $8.6M | added +10.7% | 2020 Q4 |
| Atlantic Investment Management, INC. (focused) | 220.0k | 0.36% | $8.4M | added +10% | 2025 Q4 |
| Algert Global LLC | 213.4k | 0.35% | $8.2M | trimmed -14.4% | 2023 Q4 |
| Olstein Capital Management, L.p. | 211.4k | 0.35% | $8.1M | unchanged | 2022 Q1 |
| Public Sector Pension Investment Board | 209.6k | 0.34% | $8.1M | trimmed -1.1% | ≤2013 |
| Lazard Asset Management LLC | 195.7k | 0.32% | $7.5M | added +15% | 2023 Q4 |
| Russell Investments Group, LTD. | 181.1k | 0.30% | $7.0M | added +13.2% | 2018 Q1 |
| Rhumbline Advisers | 170.6k | 0.28% | $6.6M | trimmed -3.3% | ≤2013 |
| ProShare Advisors LLC | 152.3k | 0.25% | $5.8M | added +4.3% | ≤2013 |
| Raymond James Financial INC | 149.9k | 0.25% | $5.8M | added +4% | 2020 Q4 |
| American Century Companies INC | 147.1k | 0.24% | $5.6M | trimmed -87.2% | 2021 Q1 |
| Legal & General Group PLC | 145.7k | 0.24% | $5.6M | trimmed -8.9% | ≤2013 |
Largest 50 of 278 shown; the full ranked, searchable register is at boothcheck.com/holders/ABM. 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.