- S&P 500 7,659.44 −1.09%
- Dow Jones 52,002.41 −0.34%
- Nasdaq 26,713.03 +0.08%
- VIX 19.99 +21.45%
- 10-year Treasury 5.09% −0.01
- Dollar index 121.40 −0.14%
- WTI crude $101.91 +1.04%
Westfield Capital Management Company, L.P.: investment adviser
Westfield Capital Management Company, L.P. is an investment adviser registered with the SEC (file 801-69413, CRD 146990). What it reports on Form ADV: assets and clients, fees, owners, disciplinary history and its client brochure. From the SEC's Investment Adviser Public Disclosure site; read Oct 21, 2026.
- Assets managed
- $29.8B
- Discretionary
- 100%
- Accounts
- 9,391
- Employees
- 63
- In advisory roles
- 19
- Disclosures
- 0
Company page · SEC adviser record · Full Form ADV (PDF)
The firm reports that it or a related person has custody of client cash and securities.
Form ADV Part 1A, Item 5, as filed on the SEC Investment Adviser Public Disclosure site; read Oct 21, 2026.
Clients and fees
Whom the firm advises and how it is paid, from Items 5.D, 5.E and 5.G.
| Client type | Clients | Assets | Share |
|---|---|---|---|
| Individuals | 8,398 | $698.8M | 2.3% |
| High net worth individuals | 512 | $1.3B | 4.5% |
| Registered funds | 15 | $10.0B | 33.5% |
| Private funds and other pooled vehicles | 15 | $4.5B | 15.2% |
| Pension and profit-sharing plans | 177 | $6.4B | 21.4% |
| Charities | 138 | $1.4B | 4.8% |
| State and local governments | 38 | $4.3B | 14.4% |
| Other advisers | 1 | $661.0M | 2.2% |
| Corporations | 97 | $496.4M | 1.7% |
How it is paid
- A percentage of assets under your management
- Performance-based fees
Services
- Portfolio management for individuals and/or small businesses
- Portfolio management for investment companies (as well as "business development companies" that have made an election pursuant to section 54 of the Investment Company Act of 1940)
- Portfolio management for pooled investment vehicles (other than investment companies)
- Portfolio management for businesses (other than small businesses) or institutional clients (other than registered investment companies and other pooled investment vehicles)
Who owns it
Schedule A lists direct owners of 5% or more (and officers who own a stake); Schedule B lists the owners of those owners.
Direct owners (Schedule A)
| Owner | Type | Role | Stake | Since | Control | Public company |
|---|---|---|---|---|---|---|
| WMS Management LLC | Company (U.S.) | Limited partner | E 75% or more | Jun 2008 | Yes | |
| MG Am Holding, Inc. | Company (U.S.) | Limited partner | B 10% to 25% | Apr 2025 |
Indirect owners (Schedule B)
| Owner | Owns a stake in | Type | Stake | Control | Public company |
|---|---|---|---|---|---|
| Robert Tizoc Flores | WMS Management Management LLC Committee | Person | F General partner, trustee or managing member | Yes | |
| Kathryn Ann Kearney | WMS Management Management LLC Committee | Person | F General partner, trustee or managing member | Yes | |
| Richard Dailyong Lee | WMS Management Management LLC Committee | Person | F General partner, trustee or managing member | Yes | |
| Monex Group, Inc. | MG Am Holding, Inc. MG Am Holding, | Company (outside the U.S.) | F General partner, trustee or managing member | ||
| John Morgen Montgomery | WMS Management Management LLC Committee | Person | F General partner, trustee or managing member | Yes | |
| Justin Matthew Moscardelli | WMS Management Management LLC Committee | Person | F General partner, trustee or managing member | Yes | |
| Jenny Ann Muller | WMS Management Management LLC Committee | Person | F General partner, trustee or managing member | Yes | |
| Matthew Robert Renna | WMS Management Management LLC Committee | Person | F General partner, trustee or managing member | Yes | |
| WMS Management LLC | WMS General Partner LLC | Company (U.S.) | E 75% or more | Yes | |
| William Albert Muggia | WMS Management Management LLC Committee | Person | D 50% to 75% | Yes |
Form ADV reports ownership in bands, not exact stakes: A means 5% to 10%, B 10% to 25%, C 25% to 50%, D 50% to 75%, E 75% or more. F marks a general partner, trustee or managing member, a role that controls the firm without a percentage. Owners of less than 5% are not listed.
Form ADV Schedules A and B, via the SEC Investment Adviser Public Disclosure site.
Disciplinary history
The firm answered No to every disciplinary question on Form ADV (Item 11).
The brochure
No brochure text was read for this firm.
Other brochures on file
Form ADV Part 2A, via the SEC Investment Adviser Public Disclosure site.