Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
228 institutional managers reported holding AIN for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 59%. 30 opened new positions; 40 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 4.21M | 14.73% | $219.7M | trimmed -0.8% | ≤2013 |
| Vanguard Group | 3.29M | 11.54% | $172.1M | added +4.4% | ≤2013 |
| Earnest Partners LLC | 2.51M | 8.78% | $130.9M | trimmed -2.1% | 2014 Q1 |
| American Century Companies INC | 1.44M | 5.06% | $75.4M | added +4.5% | 2019 Q2 |
| State Street | 1.10M | 3.87% | $57.7M | trimmed -3.2% | 2015 Q4 |
| Bank OF America CORP /DE/ | 1.04M | 3.65% | $54.5M | added +18.2% | ≤2013 |
| Dimensional Fund Advisors | 914.9k | 3.21% | $47.8M | trimmed -4.2% | ≤2013 |
| Barrow Hanley Mewhinney & Strauss LLC | 867.9k | 3.04% | $45.3M | added +59.4% | 2024 Q3 |
| SEI Investments CO | 786.5k | 2.75% | $41.1M | added +1.4% | ≤2013 |
| Geode Capital | 700.8k | 2.46% | $36.6M | added +1.8% | ≤2013 |
| Gamco Investors, INC. et al | 644.6k | 2.26% | $33.7M | added +199.8% | 2013 Q3 |
| MFS Investment Management | 593.3k | 2.08% | $31.0M | trimmed -5% | 2024 Q4 |
| William Blair Investment Management, LLC | 502.0k | 1.76% | $26.2M | added +3.7% | 2016 Q1 |
| D. E. Shaw | 466.5k | 1.63% | $24.4M | trimmed -19.1% | 2023 Q1 |
| Charles Schwab Investment Management | 454.5k | 1.59% | $23.7M | added +5.2% | ≤2013 |
| Deprince Race & Zollo INC | 439.1k | 1.54% | $22.9M | added +20.3% | 2025 Q4 |
| Two Sigma | 434.1k | 1.52% | $22.7M | added +547.2% | 2023 Q1 |
| Nuveen | 426.1k | 1.49% | $22.2M | added +8.3% | 2019 Q2 |
| Northern Trust | 342.5k | 1.20% | $17.9M | added +6.7% | ≤2013 |
| Citadel Advisors | 322.5k | 1.13% | $16.8M | added +67.4% | 2017 Q1 |
| Neuberger Berman Group LLC | 315.2k | 1.10% | $16.5M | added +3.8% | 2025 Q4 |
| Morgan Stanley | 313.1k | 1.10% | $16.4M | trimmed -19.2% | ≤2013 |
| GAMCO (Gabelli) | 281.7k | 0.99% | $14.7M | added +88.5% | 2013 Q3 |
| NEW York State Common Retirement Fund | 279.7k | 0.98% | $14.6M | added +2.5% | ≤2013 |
| Marshall Wace | 268.0k | 0.94% | $14.0M | added +135.7% | 2024 Q2 |
| Aristotle Capital Boston, LLC | 264.5k | 0.93% | $13.8M | trimmed -13.2% | 2015 Q4 |
| Schonfeld Strategic Advisors | 252.1k | 0.88% | $13.2M | added +86.1% | 2025 Q1 |
| Voloridge Investment Management | 236.9k | 0.83% | $12.4M | added +3.2% | 2023 Q2 |
| First Eagle Investment Management | 204.8k | 0.72% | $10.7M | added +55.4% | 2025 Q3 |
| UBS | 200.0k | 0.70% | $10.4M | added +18.5% | ≤2013 |
| Wells Fargo & COMPANY/MN | 189.8k | 0.67% | $9.9M | trimmed -28.3% | ≤2013 |
| Millennium Management | 188.5k | 0.66% | $9.8M | trimmed -51.8% | 2018 Q3 |
| Monimus Capital Management, LP | 175.7k | 0.61% | $9.2M | added +139% | 2025 Q3 |
| Hotchkis & Wiley Capital Management LLC | 170.6k | 0.60% | $8.9M | added +58.3% | 2024 Q1 |
| Gw&k Investment Management, LLC | 165.5k | 0.58% | $8.6M | trimmed -9.2% | 2024 Q4 |
| BNY Mellon | 165.1k | 0.58% | $8.6M | trimmed -7.9% | ≤2013 |
| Envestnet Asset Management INC | 161.7k | 0.57% | $8.4M | trimmed -12.7% | 2015 Q3 |
| Natixis Advisors, LLC | 143.5k | 0.50% | $7.5M | trimmed -27.4% | 2017 Q2 |
| Trexquant Investment LP | 142.4k | 0.50% | $7.4M | added +77.7% | 2025 Q4 |
| Jones Financial Companies Lllp | 140.2k | 0.49% | $7.3M | added +73710.5% | 2023 Q3 |
| Principal Financial Group INC | 139.7k | 0.49% | $7.3M | added +2% | ≤2013 |
| Goldman Sachs | 137.2k | 0.48% | $7.2M | trimmed -8.2% | ≤2013 |
| Invesco | 135.6k | 0.47% | $7.1M | added +19.2% | ≤2013 |
| Ameriprise Financial INC | 110.5k | 0.39% | $5.8M | added +5.9% | ≤2013 |
| Granite Investment Partners, LLC | 108.4k | 0.38% | $5.7M | added +72% | 2022 Q4 |
| Public Sector Pension Investment Board | 102.7k | 0.36% | $5.4M | added +3.5% | ≤2013 |
| Russell Investments Group, LTD. | 95.9k | 0.34% | $5.0M | added +25.4% | 2022 Q3 |
| Renaissance Technologies | 95.9k | 0.34% | $5.0M | opened | 2026 Q1 |
| Rhumbline Advisers | 92.0k | 0.32% | $4.8M | trimmed -2.8% | ≤2013 |
| Jane Street | 85.3k | 0.30% | $4.5M | added +1070.6% | 2022 Q2 |
Largest 50 of 228 shown; the full ranked, searchable register is at boothcheck.com/holders/AIN. 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.