Artisan Mid Cap Fund adds Comfort Systems USA on data centre demand
Artisan Partners cited hyperscaler construction, earnings growth and margin expansion when adding the mechanical services provider in the second quarter.
Artisan Partners’ Artisan Mid Cap Fund added Comfort Systems USA during the second quarter of 2026, according to the firm’s investor letter. The fund cited strong demand from data centre construction, earnings growth, margin expansion and raised full-year guidance.
The fund said construction driven by hyperscaler customers now accounts for a majority of Comfort Systems USA’s revenue. The company provides heating, ventilation and air conditioning services, along with mechanical and electrical installation, maintenance, repair and replacement services.
According to Artisan, recent earnings exceeded expectations, with year-on-year same-store revenue growth of 51% and expanded margins. The fund said Comfort Systems USA was well positioned to benefit from continued investment in data centre infrastructure.
The Artisan Mid Cap Fund returned between 17.86% and 17.93% across its investor, advisor and institutional classes in the quarter, compared with a 14.55% gain for the Russell Midcap Growth Index.
The available material does not specify the size, timing or purchase price of the fund’s addition. The company metrics and revenue mix cited in the report are based on Artisan’s commentary and have not been independently verified in the source material.
