Acquisition of New Hampshire Brokerage Establishes Firm’s First Office Outside Massachusetts
Gibson Sotheby’s International Realty, a leading New England real estate brokerage, announced today its acquisition of Madden Group, a boutique brokerage serving New Hampshire’s Seacoast and surrounding markets, along with the opening of a new office in Portsmouth, New Hampshire. The location represents the firm’s first office outside Massachusetts and the first Sotheby’s International Realty® office in Portsmouth.
Jennifer Madden, former principal owner and managing broker of Madden Group, will join Gibson Sotheby’s International Realty as Vice President, New Hampshire, based in the firm’s office at 75 Congress Street, Suite 103, Portsmouth. Madden Group serves clients throughout New Hampshire’s Seacoast as well as Massachusetts and southern Maine. Its short-term vacation rental division, Rising Tide Rentals, will continue to operate under its existing brand.
“Jenn has built a brokerage that reflects many of the values we’ve prioritized as we’ve grown: a boutique culture, close collaboration, and a deep commitment to the communities it serves,” said Larry Rideout, chairman and founder of Gibson Sotheby’s International Realty. “This builds on a business already active in New Hampshire, where our agents have long served clients from Newburyport and across coastal New England, and Jenn’s team is an exceptional cultural fit.”
“In an industry that has experienced significant change in recent years, our continued growth reflects the stability of our company and the strength of the advisors who choose to build their businesses here,” said Colleen Barry, chief executive officer of Gibson Sotheby’s International Realty. “We’re excited to support Jenn and her team through the Sotheby’s International Realty network, connecting their clients to buyers and sellers around the world.”
“Since 2010, we’ve built our business on trust, local expertise, and strong relationships across the Seacoast region,” said Madden. “Joining Gibson Sotheby’s International Realty allows us to pair that foundation with the support and global reach of the Sotheby’s International Realty brand, elevating what we can offer our clients while continuing to serve the communities we know best.”
The acquisition continues Gibson Sotheby’s International Realty’s growth under the leadership of Chairman and Founder Larry Rideout, Principal and Founder Paul McGann, Chief Executive Officer Colleen Barry, and President Nicole Rideout Hartwick. The firm reported a sales volume of $4 billion in 2025, making it the #1 Massachusetts-based real estate firm by sales volume.
For more information, contact Gibson Sotheby’s International Realty at 617.426.6900 or info@gibsonsir.com.
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About Gibson Sotheby’s International Realty
Gibson Sotheby’s International Realty is Eastern Massachusetts’ premier real estate brokerage firm with 33 offices and more than 700 sales associates serving Boston, Greater Boston, MetroWest, the North Shore, South Shore, South Coast, Cape Cod and the Islands, Rhode Island and Coastal New Hampshire. Founded in 1962, Gibson Sotheby’s International Realty is regarded for its local expertise, innovative technology, exclusive media partnerships, and brand heritage and reputation. The firm’s affiliation with Sotheby’s International Realty® offers the company exclusive access to a global clientele through a network of more than 1,100 offices in 86 countries and territories. Gibson Sotheby’s International Realty is the largest Massachusetts-based, independently-owned and operated brokerage. For more information, visit sothebysrealty.com/gibsonsir.
About Sotheby’s International Realty®
Sotheby’s International Realty® was founded in 1976 as a real estate service for discerning clients of Sotheby’s. Today, the company’s global footprint spans more than 1,100 offices located in 86 countries and territories worldwide, including 47 company-owned brokerage offices in key metropolitan and resort markets. Through a long-term strategic alliance with Sotheby’s, one of the world’s premier destinations for art and luxury, the company licenses the Sotheby’s International Realty® brand for its franchise system. The franchise system is comprised of an affiliate network, where each office is independently owned and operated. Sotheby’s International Realty® supports its affiliates and agents with a host of operational, marketing, recruiting, educational and business development resources. Affiliates and agents also benefit from an association with Sotheby’s, established in 1744. For more information, visit sothebysrealty.com.
The affiliate network is operated by Sotheby’s International Realty Affiliates LLC, and the company owned brokerages are operated by Sotheby’s International Realty, Inc. Both entities are a part of Compass International Holdings (NYSE: COMP), a global real estate services company with a presence in every major U.S. city and in approximately 120 countries and territories. Both Sotheby’s International Realty Affiliates LLC and Sotheby’s International Realty, Inc. fully support the principles of the Fair Housing Act and the Equal Opportunity Act.