# SEI INVESTMENTS CO — DEFA14A

SEI INVESTMENTS CO of OAKS, PA filed a DEFA14A with the SEC on 2017-04-24. Industry: Security Brokers, Dealers & Flotation Companies.

## Filing

- Filed: 2017-04-24
- Form: DEFA14A
- Accession: 0000350894-17-000025
- Registrant: SEI INVESTMENTS CO
- CIK: 0000350894
- Industry (SIC): Security Brokers, Dealers & Flotation Companies (6211)
- State of incorporation: PA
- Location: OAKS, PA

## Documents (3)

| Seq | Type | Description |
| --- | --- | --- |
| 1 | DEFA14A | ADDITIONAL DEFINITIVE PROXY SOLICITING MATERIALS |
| 2 | GRAPHIC | GRAPHIC |
| 3 | GRAPHIC | GRAPHIC |

## Filing timeline for this registrant (38)

_Showing 12 of 38 filings._

| Filed | Form |
| --- | --- |
| [2026-04-15](https://search.stillhousedata.com/proxy/0000350894-26-000021) | DEF 14A |
| [2025-05-07](https://search.stillhousedata.com/proxy/0000350894-25-000074) | DEFA14A |
| [2025-04-14](https://search.stillhousedata.com/proxy/0000350894-25-000060) | DEF 14A |
| [2024-04-15](https://search.stillhousedata.com/proxy/0000350894-24-000066) | DEF 14A |
| [2023-04-20](https://search.stillhousedata.com/proxy/0000350894-23-000048) | DEF 14A |
| [2022-04-27](https://search.stillhousedata.com/proxy/0000350894-22-000023) | DEF 14A |
| [2021-04-27](https://search.stillhousedata.com/proxy/0000350894-21-000026) | DEF 14A |
| [2020-05-14](https://search.stillhousedata.com/proxy/0000350894-20-000028) | DEFA14A |
| [2020-04-23](https://search.stillhousedata.com/proxy/0000350894-20-000023) | DEF 14A |
| [2019-04-17](https://search.stillhousedata.com/proxy/0000350894-19-000021) | DEF 14A |
| [2018-04-10](https://search.stillhousedata.com/proxy/0000350894-18-000029) | DEF 14A |
| 2017-04-24 | DEFA14A |

## More

- [CIK 350894 on SEC EDGAR (source of record)](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=350894&type=&dateb=&owner=include&count=40)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/proxy/0000350894-17-000025.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.