# WESTFIELD CAPITAL MANAGEMENT COMPANY, L.P.

WESTFIELD CAPITAL MANAGEMENT COMPANY, L.P. of BOSTON, MA is an SEC-registered investment adviser.

## Registration

- CRD: 146990
- Type: SEC-registered investment adviser
- SEC file number: 801-69413
- Location: ONE FINANCIAL CENTER, BOSTON, MA, 02111
- Phone: (617) 428-7100
- Latest filing: 2026-07-01
- Regulatory AUM: $29.8B
- Discretionary AUM: $29.8B
- Clients: 63
- Accounts: 9,391

## Business model

- Compensation: % of AUM, Performance
- Clients served: High net worth, Pooled vehicles, Investment cos

## Officers, owners & control persons (27)

_Showing 25 of 27 people._

| Name | Role | Location |
| --- | --- | --- |
| William Albert Muggia | CHIEF EXECUTIVE OFFICER AND CHIEF INVESTMENT OFFICER; MEMBER OF MANAGEMENT COMMITTEE | — |
| John Morgen Montgomery | CHIEF OPERATING OFFICER; MEMBER OF MANAGEMENT COMMITTEE | — |
| Kathryn Ann Kearney | MEMBER OF MANAGEMENT COMMITTEE; PARTNER, CHIEF FINANCIAL OFFICER AND CHIEF COMPLIANCE OFFICER | — |
| Robert Tizoc Flores | MEMBER OF MANAGEMENT COMMITTEE | — |
| Richard Dailyong Lee | CHIEF INVESTMENT OFFICER; MEMBER OF MANAGEMENT COMMITTEE | — |
| Jenny Ann Muller | MEMBER OF MANAGEMENT COMMITTEE | — |
| Matthew Robert Renna | MEMBER OF MANAGEMENT COMMITTEE | — |
| Justin Matthew Moscardelli | MEMBER OF MANAGEMENT COMMITTEE | — |
| Ethan Joseph Meyers | MEMBER OF MANAGEMENT COMMITTEE | — |
| HAZARD CHARLES MICHAEL | BOARD OF DIRECTORS | — |
| VAILL TIMOTHY LANDON | BOARD OF DIRECTORS | — |
| BAUERNFEIND ARTHUR JON | CHAIRMAN, BOARD OF DIRECTORS | — |
| MUGGIA WILLIAM ALBERT | CEO; CEO, BOARD OF DIRECTORS; CHIEF EXECUTIVE OFFICER AND CHIEF INVESTMENT OFFICER (+2 more) | — |
| DIGRAVIO KAREN ANN | CFO, CHIEF COMPLIANCE OFFICER; CFO, CHIEF COMPLIANCE OFFICER, BOARD OF DIRECTORS; CLASS B MEMBER, MEMBER OF MANAGEMENT COMMITTEE | — |
| STROBECK MATTHEW WILLIAM | BOARD OF DIRECTORS; CLASS A MEMBER, MEMBER OF MANAGEMENT COMMITTEE | — |
| FEAREY MORTON | BOARD OF DIRECTORS; CLASS A & B MEMBER, MEMBER OF MANAGEMENT COMMITTEE; CLASS B MEMBER, MEMBER OF MANAGEMENT COMMITTEE (+1 more) | — |
| KEARNEY KATHRYN ANN | CHIEF FINANCIAL OFFICER; CHIEF FINANCIAL OFFICER AND CHIEF COMPLIANCE OFFICER; MEMBER OF MANAGEMENT COMMITTEE (+1 more) | — |
| THOMPSON DAVID HAMLEN | CLASS B MEMBER, MEMBER OF MANAGEMENT COMMITTEE; MEMBER OF MANAGEMENT COMMITTEE | — |
| MEYERS ETHAN JOSEPH | BOARD OF DIRECTORS; MEMBER OF MANAGEMENT COMMITTEE | — |
| MCAULEY HELEN LEE | CHIEF COMPLIANCE OFFICER | — |
| FLORES ROBERT TIZOC | MEMBER OF MANAGEMENT COMMITTEE | — |
| JACOBS BRUCE NATHAN | MEMBER OF MANAGEMENT COMMITTEE | — |
| LEE RICHARD DAILYONG | CHIEF INVESTMENT OFFICER; CO-CHIEF INVESTMENT OFFICER; DEPUTY CHIEF INVESTMENT OFFICER (+1 more) | — |
| MONTGOMERY JOHN MORGEN | CHIEF OPERATING OFFICER; MEMBER OF MANAGEMENT COMMITTEE | — |
| MULLER THERESA ANN | MEMBER OF MANAGEMENT COMMITTEE | — |


## Related pages

- Form ADV Part 2 brochure: https://search.stillhousedata.com/firm/146990/brochure
- Similar advisers: https://search.stillhousedata.com/firm/146990/similar
- Related entities: https://search.stillhousedata.com/firm/146990/related
- SEC IAPD (source of record): https://adviserinfo.sec.gov/firm/summary/146990

---

Source: public SEC Form ADV 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.