# Osterweis Opportunity Fund

Osterweis Opportunity Fund is a registered fund series of Professionally Managed Portfolios (series S000055531). Net assets $287.4M as of 2026-03-31.

## Profile

- Series ID: S000055531
- Registrant: Professionally Managed Portfolios
- LEI: 2549006GRQIC9TNOY952
- Net assets: $287.4M
- Total assets: $287.8M
- As of: 2026-03-31

## Advisers

- [Osterweis Capital Management, LLC (Advisor)](https://search.stillhousedata.com/firm/109580)

## Top holdings (43 reported)

_Showing 15 of 43 holdings by value._

| Holding | Ticker | Value | % of fund |
| --- | --- | --- | --- |
| [Federated Hermes US Treasury C](https://search.stillhousedata.com/security/60934N682) | — | $27.3M | 951.43% |
| [Life Time Group Holdings Inc](https://search.stillhousedata.com/security/53190C102) | — | $10.5M | 366.51% |
| [Axos Financial Inc](https://search.stillhousedata.com/security/05465C100) | — | $10.5M | 365.26% |
| [Guardant Health Inc](https://search.stillhousedata.com/security/40131M109) | — | $10.4M | 360.63% |
| [VSE Corp](https://search.stillhousedata.com/security/918284100) | — | $9.7M | 337.00% |
| [Vericel Corp](https://search.stillhousedata.com/security/92346J108) | — | $9.7M | 336.54% |
| [CECO Environmental Corp](https://search.stillhousedata.com/security/125141101) | — | $9.6M | 334.52% |
| Fabrinet | — | $9.2M | 318.59% |
| [Novanta Inc](https://search.stillhousedata.com/security/67000B104) | — | $9.0M | 311.50% |
| [Casella Waste Systems Inc](https://search.stillhousedata.com/security/147448104) | — | $8.9M | 308.02% |
| [Glaukos Corp](https://search.stillhousedata.com/security/377322102) | — | $7.7M | 266.84% |
| [Repligen Corp](https://search.stillhousedata.com/security/759916109) | — | $7.6M | 265.50% |
| [AtriCure Inc](https://search.stillhousedata.com/security/04963C209) | — | $7.5M | 262.37% |
| [DigitalOcean Holdings Inc](https://search.stillhousedata.com/security/25402D102) | — | $7.5M | 261.67% |
| [Twist Bioscience Corp](https://search.stillhousedata.com/security/90184D100) | — | $7.5M | 261.27% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-03-31 | $287.4M |
| 2025-12-31 | $306.9M |
| 2025-09-30 | $316.8M |
| 2025-06-30 | $317.1M |
| 2025-03-31 | $353.4M |
| 2024-12-31 | $422.6M |
| 2024-09-30 | $387.8M |
| 2024-06-30 | $328.5M |

## More

- [Registrant: Professionally Managed Portfolios](https://search.stillhousedata.com/registrant/811030)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/fund/S000055531.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.