# SQUARE CIRCLE IA LP

SQUARE CIRCLE IA LP of BOSTON, MA is an SEC-registered investment adviser.

## Registration

- CRD: 312718
- Type: SEC-registered investment adviser
- SEC file number: 801-126286
- Location: 105 NEWBURY STREET, 4TH FLOOR, BOSTON, MA, 02116
- Phone: 617-918-7057
- Latest filing: 2026-03-27
- Regulatory AUM: $448.9M
- Discretionary AUM: $448.9M
- Clients: 3
- Accounts: 2

## Business model

- Compensation: Performance, Other
- Clients served: Investment cos

## Officers, owners & control persons (7)

| Name | Role | Location |
| --- | --- | --- |
| [Dong Nmn Han](https://search.stillhousedata.com/person/705473) | PRINCIPAL; TRUSTEE | — |
| [Adam A Horowitz](https://search.stillhousedata.com/person/705474) | CHIEF COMPLIANCE OFFICER; CHIEF FINANCIAL OFFICER; CHIEF OPERATING OFFICER | — |
| [HOROWITZ ADAM A](https://search.stillhousedata.com/person/821615) | CHIEF COMPLIANCE OFFICER; CHIEF FINANCIAL OFFICER; CHIEF OPERATING OFFICER | — |
| [HAN DONG NMN](https://search.stillhousedata.com/person/874658) | LIMITED PARTNER; MANAGING MEMBER; TRUSTEE | — |
| [HAN DONG](https://search.stillhousedata.com/person/900768) | MANAGING MEMBER; PARTNER | — |
| [Sarah Lyn-Erika Sweeney](https://search.stillhousedata.com/person/983876) | CHIEF COMPLIANCE OFFICER | — |
| [Adam A. Horowitz](https://search.stillhousedata.com/person/1065221) | CHIEF COMPLIANCE OFFICER; CHIEF FINANCIAL OFFICER; CHIEF OPERATING OFFICER | — |


## Private funds (2)

| Fund | Type | Formed | Owners | GAV | Min investment |
| --- | --- | --- | --- | --- | --- |
| ANAXAGORAS LP | Hedge Fund | Delaware | 1 | $318.2M | — |
| OENOPIDES LP | Hedge Fund | Delaware | 4 | $130.7M | $1.0M |


## Fund service providers (1)

- administrator: MORGAN STANLEY FUND SERVICES USA LLC — 2 funds

## Related pages

- Form ADV Part 2 brochure: https://search.stillhousedata.com/firm/312718/brochure
- Similar advisers: https://search.stillhousedata.com/firm/312718/similar
- Related entities: https://search.stillhousedata.com/firm/312718/related
- SEC IAPD (source of record): https://adviserinfo.sec.gov/firm/summary/312718

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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.