Differentiated Strategy.
Sound Execution.
Operational Focus.

Siris is a private equity firm that invests in mission-critical, mature tech & telecom businesses at strategic crossroads.

Our StrategyOur Team

Since 2011

Siris has raised over $5.9 billion of cumulative committed capital and is currently targeting investment opportunities with transaction values of $500 million to $5 billion.

Tech & Telecom Focus

Our portfolio consists of companies with mission-critical products and services across the tech and telecom landscape.


April 14, 2021

Koch Equity Development Affiliate Enters Agreement to Acquire Transaction Network Services, Positioned For Strategic Growth  Read More

February 10, 2021

Clearlake and Siris Affiliates Re-Establish Digital Marketing Industry Pioneer Constant Contact as Standalone Company  Read More


Combining investment acumen and hands-on operating expertise.

New York

601 Lexington Ave.
59th Floor
New York, NY 10022

Palo Alto

524 Hamilton Ave.
Suite 201
Palo Alto, CA 94301