# Rosemore Inc.

Rosemore Inc. is a Single Family Office based in Baltimore, United States.

## Overview

- **Organization type:** Single Family Office
- **Headquarters:** Baltimore, United States
- **Region:** North America
- **Address:** Baltimore, MD, United States
- **Founded:** 1931
- **Assets under management:** Undisclosed
- **Website:** rosemoreinc.com
- **LinkedIn:** https://www.linkedin.com/company/rosemore-inc

## Regulatory record

- **Reports private funds:** No

## About

Rosemore Inc. was formed in 1931 by the original founders of the American Oil Company to consolidate and expand their holdings. Henry A. Rosenberg Jr. and Frank B. Rosenberg now serve as co-chairmen, with Frank also acting as CIO. Primary operations today center on oil and gas exploration, production, and transportation through Tema Oil and Gas Company and Gateway Gathering and Marketing Company. The firm also holds real estate assets including properties at 100 Light Street and 1 North Charles Street in Baltimore plus acreage in the Permian Basin. Investment activity spans direct holdings in energy infrastructure, private credit, and real estate across North America. The firm maintains an operational office in Houston and participates in local networks such as the Center Club and the National Aquarium in Baltimore. Henry A. Rosenberg Jr. holds emeritus board status at the Center Club. Two family foundations, the Henry and Ruth Blaustein Rosenberg Foundation and the Rosemore Family Foundation Inc., sit alongside the office. Rosemore Inc. integrates operating-company management with investment deployment under the same principals, a structure that ties day-to-day energy operations directly to capital allocation decisions.

## Sectors

- Energy
- Real Estate
- Infrastructure

## Offices

- Houston, TX, United States

## People

- Henry A. Rosenberg Jr. — Co-Chairman
- Frank B. Rosenberg — Co-Chairman and CIO

## Questions

### Who runs investment decisions at Rosemore Inc.?

Frank B. Rosenberg holds the roles of Co-Chairman and CIO.

### Does Rosemore Inc. participate in fund commitments or only direct deals?

The firm deploys through direct holdings in operating subsidiaries and a diversified portfolio that includes real assets and marketable securities.

### Which sectors receive the largest allocations?

Energy exploration, production, and midstream infrastructure form the core of current operations.

### How is Rosemore Inc. related to the Blaustein family?

Rosemore manages wealth associated with the Blaustein/Rosenberg families.

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- [Roos van Diemen & Partners](https://altss.com/profile/roos-van-diemen-partners)
- [Roussin Capital Group](https://altss.com/profile/roussin-capital-group-llc-rick-roussin-family-office)

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Last updated: 2026-08-10T15:58:45.833Z

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