# William Arthur ONeil

William Arthur ONeil is an investment adviser representative (IAR) with state registration records since 2020, appearing at 4 firms. Currently registered with MFS INSTITUTIONAL ADVISORS INC..

## Registration history (4)

| Firm | From | To | Current |
| --- | --- | --- | --- |
| [MFS INSTITUTIONAL ADVISORS INC.](https://search.stillhousedata.com/firm/107144) | 2026-04-10 | present | Yes |
| [PUTNAM INVESTMENT MANAGEMENT, LLC](https://search.stillhousedata.com/firm/106629) | 2022-05-25 | 2024-05-28 | — |
| [AMUNDI ASSET MANAGEMENT US, INC.](https://search.stillhousedata.com/firm/107719) | 2021-01-04 | 2022-05-06 | — |
| [AMUNDI PIONEER INSTITUTIONAL ASSET MANAGEMENT, INC.](https://search.stillhousedata.com/firm/138756) | 2020-06-09 | 2020-12-31 | — |

## More

- [This representative on SEC IAPD (source of record)](https://adviserinfo.sec.gov/individual/summary/6983697)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/rep/6983697.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.