ARIEL INVESTMENTS, LLC: AFFILIATED MANAGERS GROUP (AMG): Quarterly 13F Position History
As of Q1 2026, ARIEL INVESTMENTS, LLC reported 2,128,060 shares of AFFILIATED MANAGERS GROUP (AMG), worth $588.8M and representing 3.3% of its 13F equity book. Quarter-over-quarter share count change: 236,386 (-10.0%) . The position first appeared in Q3 2018 and has been disclosed across 31 13F-HR filings in Pactolio's tracked window.
- 2,128,060Shares Held (Latest Filing)
- $588.8MReported Market Value (Latest Filing)
- 3.3%Portfolio Weight (% of 13F Equity Book)
- 236,386Quarter-over-Quarter Share Change
- -$92.8MQuarter-over-Quarter Value Change
- 2,904,322Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 31 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 2,128,060 | 236,386 | -10.0% | $588.8M | 3.3% | $276.7 |
| Q4 2025 | 2,364,446 | 163,202 | -6.5% | $681.6M | 3.7% | $288.3 |
| Q3 2025 | 2,527,648 | 182,502 | -6.7% | $602.7M | 3.2% | $238.4 |
| Q2 2025 | 2,710,150 | 104,152 | -3.7% | $533.3M | 3.0% | $196.8 |
| Q1 2025 | 2,814,302 | 33,552 | -1.2% | $472.9M | 2.8% | $168.0 |
| Q4 2024 | 2,847,854 | 56,468 | -1.9% | $526.6M | 2.8% | $184.9 |
| Q3 2024 | 2,904,322 | +18,688 | +0.6% | $516.4M | 2.6% | $177.8 |
| Q2 2024 | 2,885,634 | +231,616 | +8.7% | $450.8M | 2.4% | $156.2 |
| Q1 2024 | 2,654,018 | +168,626 | +6.8% | $444.5M | 2.2% | $167.5 |
| Q4 2023 | 2,485,392 | +109,100 | +4.6% | $376.3M | 1.9% | $151.4 |
| Q3 2023 | 2,376,292 | +241,954 | +11.3% | $309.7M | 1.6% | $130.3 |
| Q2 2023 | 2,134,338 | 49,982 | -2.3% | $319.9M | 1.5% | $149.9 |
| Q1 2023 | 2,184,320 | 72,294 | -3.2% | $311.1M | 1.5% | $142.4 |
| Q4 2022 | 2,256,614 | 33,894 | -1.5% | $357.5M | 1.8% | $158.4 |
| Q3 2022 | 2,290,508 | +70,608 | +3.2% | $256.2M | 1.4% | $111.9 |
| Q2 2022 | 2,219,900 | +345,452 | +18.4% | $258.8M | 1.3% | $116.6 |
| Q1 2022 | 1,874,448 | +79,152 | +4.4% | $264.2M | 1.2% | $141.0 |
| Q4 2021 | 1,795,296 | +109,678 | +6.5% | $295.3M | 1.2% | $164.5 |
| Q3 2021 | 1,685,618 | +30,660 | +1.9% | $254.7M | 1.2% | $151.1 |
| Q2 2021 | 1,654,958 | +3,752 | +0.2% | $255.2M | 1.2% | $154.2 |
| Q1 2021 | 1,651,206 | +68,298 | +4.3% | $246.1M | 1.2% | $149.0 |
| Q4 2020 | 1,582,908 | +84,066 | +5.6% | $161.0M | 0.9% | $101.7 |
| Q3 2020 | 1,498,842 | +264 | +0.0% | $102.5M | 0.7% | $68.4 |
| Q2 2020 | 1,498,578 | +180,270 | +13.7% | $111.7M | 0.9% | $74.6 |
| Q1 2020 | 1,318,308 | +132,912 | +11.2% | $78.0M | 0.7% | $59.1 |
| Q4 2019 | 1,185,396 | +11,950 | +1.0% | $100.5M | 0.6% | $84.7 |
| Q3 2019 | 1,173,446 | +258,340 | +28.2% | $97.8M | 0.7% | $83.3 |
| Q2 2019 | 915,106 | +104,278 | +12.9% | $84.3M | 0.5% | $92.1 |
| Q1 2019 | 810,828 | +4,778 | +0.6% | $86.8M | 0.5% | $107.1 |
| Q4 2018 | 806,050 | +270,256 | +50.4% | $78.5M | 0.5% | $97.4 |
| Q3 2018 | 535,794 | — | — | $73.3M | 0.4% | $136.7 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did ARIEL INVESTMENTS, LLC first disclose a AMG position in 13F-HR filings?
ARIEL INVESTMENTS, LLC first reported AFFILIATED MANAGERS GROUP (AMG) on its 13F-HR filing for the period ending 2018-09-30 (Q3 2018). The position has appeared on 31 reported quarters within Pactolio's tracked window.
What was ARIEL INVESTMENTS, LLC's most recent quarter-over-quarter share-count change in AMG?
Between Q4 2025 and Q1 2026, ARIEL INVESTMENTS, LLC reduced its AMG position by 236,386 shares (-10.0%), leaving 2,128,060 shares at a market value of $588.8M.
Does the implied price-per-share represent ARIEL INVESTMENTS, LLC's cost basis in AMG?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.