# Boxcar Partners

Boxcar Partners is a Multi Family Office based in New York, United States.

## Overview

- **Organization type:** Multi Family Office
- **Headquarters:** New York, United States
- **Region:** North America
- **Address:** 300 Park Avenue, 2nd Floor, New York, NY 10022, United States
- **Founded:** 2019
- **Assets under management:** Undisclosed
- **Website:** boxcarpartners.com
- **LinkedIn:** https://www.linkedin.com/company/boxcar-pmj

## Regulatory record

- **Reports private funds:** No

## About

Boxcar Partners was established in 2019 through the merger of three family offices. Mark Heffernan brings biotechnology experience from NexImmune. Jack Ginter contributed background in institutional securities trading at Abbot Downing. Peter Feinberg previously co-founded BridgeBio Pharma. The firm allocates to early-stage private companies and venture funds. It uses direct co-investments, SPVs and fund-of-funds structures. Focus areas include Digital Health, Biotech and Enterprise Software. Activity centers on North America. The Heffernan Family Foundation operates alongside the office. Jack Ginter holds membership in Tiger 21. Mark Heffernan participates in BIO. No public AUM figure exists.

## Sectors

- Digital Health
- AgriTech & FoodTech
- Supply Chain & Logistics
- Gaming
- Media & Entertainment
- Biotech
- Enterprise Software

## Offices

- Florida, United States

## People

- Mark Heffernan — Managing Partner
- Jack Ginter — Managing Partner
- Peter Feinberg — Founding Member and Partner
- Steven Spinner — Partner

## Questions

### Who runs investment decisions at Boxcar Partners?

Mark Heffernan, Jack Ginter and Peter Feinberg serve as managing partners. Steven Spinner joined as partner in 2021. Decisions draw on their operating backgrounds in biotechnology and trading.

### How does Boxcar Partners source proprietary deal flow?

Principals leverage networks from prior roles at NexImmune, BridgeBio Pharma and Abbot Downing. Memberships in Tiger 21 and BIO provide additional channels.

### Is Boxcar Partners structured as a single family office or does it operate more like a venture firm?

It functions as a multi-family office formed from three family offices. Capital deploys through direct co-investments, SPVs and fund-of-funds in early-stage companies.

### Does Boxcar Partners maintain philanthropic structures, and how are they separated?

The Heffernan Family Foundation exists as a separate vehicle. It operates alongside the investment office without disclosed overlap in mandate.

## Related profiles

- [Boven Family Office](https://altss.com/profile/boven-family-office)
- [Box Consultants](https://altss.com/profile/box-consultants)

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Last updated: 2026-06-03T20:00:00.000Z

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