# 4S Bay Partners

4S Bay Partners is a Single Family Office based in Highland Park, United States.

## Overview

- **Organization type:** Single Family Office
- **Headquarters:** Highland Park, United States
- **Region:** North America
- **Address:** Highland Park, IL, United States
- **Founded:** 2015
- **Assets under management:** Undisclosed
- **Website:** 4sbay.com
- **LinkedIn:** https://www.linkedin.com/company/4s-bay-partners-llc

## Regulatory record

- **Reports private funds:** No

## About

Steven Sarowitz launched 4S Bay Partners after building Paylocity into a payroll software provider. The office sits in Highland Park, Illinois and operates as the family's sole investment vehicle. Jessica Sarowitz, his wife, holds the managing partner title and also directs the Julian Grace Foundation. The office commits across private equity, real estate, hedge funds, and mission-related vehicles. It targets early-stage through late-stage equity in companies and executes direct co-investments via SPVs. Confirmed holdings include Miraflores Films. Real estate activity centers on three redevelopment sites: Stocker Street Creative in Baldwin Hills, California; 1300 Ashland Avenue in Chicago; and two residential projects in Philadelphia. All positions sit inside North America. The team includes investment, real estate, and philanthropic staff, though no headcount figure appears in public materials. Steven Sarowitz maintains membership in the Parliament of the World's Religions Circle of Patrons. Jessica Sarowitz sits on the boards of the Sierra Club Foundation and the Field Museum. No operational announcements from the past twenty-four months have been recorded. The office separates its investment book from its grant-making through distinct legal entities. Capital deployment decisions remain inside 4S Bay Partners while the Julian Grace Foundation handles philanthropic distributions. This structure keeps mission criteria inside the investment process without commingling taxable and grant assets.

## Sectors

- Media & Entertainment
- EdTech
- Workflow Automation
- SpaceTech
- Industrial Tech

## People

- Steven Sarowitz — Founder
- Jessica Sarowitz — Managing Partner

## Questions

### Who runs investment decisions at 4S Bay Partners?

Steven Sarowitz founded the office. Jessica Sarowitz serves as managing partner. Jim Casselberry holds the chief investment officer title.

### How does 4S Bay Partners source proprietary deal flow?

The firm identifies opportunities through direct community partnerships and existing board relationships. It also evaluates projects submitted via its website contact form.

### Does 4S Bay Partners participate in fund commitments or only direct deals?

The office executes direct co-investments and SPVs. It also allocates to hedge funds and private equity funds when the mandate aligns with inclusion and equity criteria.

### What investment stages does 4S Bay Partners typically target?

The firm covers seed through late-stage equity. It also pursues growth equity and real estate development opportunities.

### Does 4S Bay Partners maintain philanthropic structures, and how are they separated?

The family operates the Julian Grace Foundation and the Wayfarer Foundation as separate grant-making entities. Investment decisions stay inside 4S Bay Partners.

### What is 4S Bay Partners known posture on co-investments alongside external GPs?

The office prefers direct control through SPVs and co-investments. It evaluates external managers only when the strategy matches its documented social impact requirements.

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Last updated: 2026-08-10T15:54:10.904Z

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