Sia Partners Acquires Ethier

Sia Partners Acquires Notion Consulting

January 23, 2024

Consulting

Sia Partners has acquired Notion Consulting, a US-based strategic leadership and organizational change consultancy of about 25 experts. The deal expands Sia Partners' change management and organizational capabilities in the United States and strengthens its coast-to-coast business transformation offering.

Sia Acquires Kaiser Associates

January 29, 2026

Consulting

Sia has acquired Kaiser Associates, a boutique strategy consulting firm headquartered in Washington, D.C., to launch a dedicated Corporate Strategy, Private Equity & M&A business line and accelerate its U.S. expansion. Kaiser Associates’ leadership (Ali Cumber, Paul Mumma and Jon Meyerholz) will join Sia, with Jon Meyerholz named Managing Partner of the new business line; the deal is intended to broaden Sia’s strategic advisory capabilities and scale Kaiser’s services globally.

Cerity Partners Acquires Sullivan & Serwitz

January 1, 2020

Financial Services

Cerity Partners, an independent financial advisory firm, has merged with Los Altos, California-based Sullivan & Serwitz, which manages approximately $1 billion in client assets. The combination expands Cerity's presence in Northern California and provides a succession plan and broader service offerings for Sullivan & Serwitz's clients and colleagues.

Sia Partners Acquires Summus Group

October 5, 2021

Consulting

Sia Partners, an international management and AI consulting firm, has acquired Summus Group, a U.S.-based management consulting firm specializing in business and technology transformation for the financial industry. The deal adds ~80 consultants and strengthens Sia Partners' East Coast presence—notably Charlotte and Atlanta—while expanding its fintech and banking capabilities in the U.S.

Sia Partners Acquires Churchill Consulting (Perth)

July 6, 2022

Consulting

Sia Partners has acquired Churchill Consulting, a Perth-based independent strategy and management consulting firm with about 45 consultants and ~AUD14–15 million in revenue. The acquisition (effective July 6, 2022) establishes Sia Partners' first office in Western Australia as part of its broader push into the Australian market and strengthens its capabilities in the energy and mining sectors.

Sia Partners Acquires PPT Consulting

December 7, 2021

Consulting

Sia Partners has acquired PPT Consulting, a Philadelphia-based management and IT consulting firm founded in 2003 that specializes in project management, business and process transformation, and organizational change management. The deal expands Sia Partners' US footprint—adding a Philadelphia office and 50+ consultants—and strengthens its capabilities in Healthcare/Life Sciences, Communications, Manufacturing and Chemical sectors.