# William C Wiberg

William C Wiberg of Boston, MA appears across SEC filings — Form ADV advisers, Form D, Reg A, and crowdfunding offerings. 5 filing roles across Form D (3), Form ADV (2).

## Filings (5)

| Filed | Source | Entity | Role | Location |
| --- | --- | --- | --- | --- |
| 2025-08-29 | Form ADV | [ATV CAPITAL MANAGEMENT, INC.](https://search.stillhousedata.com/firm/162341) | VICE PRESIDENT, TREASURER & SECRETARY, DIRECTOR OF ATV CAPITAL MANAGEMENT | BOSTON, MA |
| 2025-03-12 | Form ADV | [G20 CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/170366) | MANAGING DIRECTOR OF G20 CAPITAL MANAGEMENT, LLC | CAMBRIDGE, MA |
| 2015-03-05 | Form D | [G20 Ventures I, L.P.](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=1591828&type=&dateb=&owner=include&count=40) | Director | BOSTON, MA |
| 2017-04-14 | Form D | [G20 Ventures II, L.P.](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=1702935&type=&dateb=&owner=include&count=40) | Director | BOSTON, MA |
| 2020-05-14 | Form D | [G20 Ventures III, L.P.](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=1810698&type=&dateb=&owner=include&count=40) | Director | BOSTON, MA |


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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.