# MARK BRENDAN SUMNER

MARK BRENDAN SUMNER is an investment adviser representative (IAR) with state registration records since 2009, appearing at 6 firms. Currently registered with SIGMA PLANNING CORPORATION.

## Registration history (6)

| Firm | From | To | Current |
| --- | --- | --- | --- |
| [SIGMA PLANNING CORPORATION](https://search.stillhousedata.com/firm/110692) | 2020-09-21 | present | Yes |
| [SSN ADVISORY, INC.](https://search.stillhousedata.com/firm/126090) | 2013-03-04 | 2020-09-14 | — |
| [SECURITIES AMERICA ADVISORS, INC.](https://search.stillhousedata.com/firm/110518) | 2011-09-14 | 2013-02-22 | — |
| [AMERITAS INVESTMENT COMPANY, LLC](https://search.stillhousedata.com/firm/14869) | 2010-09-27 | 2011-09-14 | — |
| [AVANTAX ADVISORY SERVICES](https://search.stillhousedata.com/firm/104556) | 2010-04-06 | 2010-09-27 | — |
| [ALLEGIANT FINANCIAL ADVISORS, LLC](https://search.stillhousedata.com/firm/141047) | 2009-02-17 | 2010-01-27 | — |

## More

- [This representative on SEC IAPD (source of record)](https://adviserinfo.sec.gov/individual/summary/5563534)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/rep/5563534.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.