Sirios Capital Management

A fundamentally driven US Long Short equity investment firm. Sirios Capital Management had $0.8bn AUM at the end of March 2025.

Founded in 1999 and based in Boston (Massachusetts, USA), Sirios Capital Management manages predominantly long short equity strategies, with a fundamental bottom-up approach, focused on growth-oriented companies with sensitivity to valuation on the long side; or weak balance sheets and deteriorating fundamentals on the short side. The investment team composed of seven investment professionals, whose senior have an average twenty-seven years of experience, also manages a long only equity strategy.

$0.8 bn

Assets under management (as of 31 March 2025)

2018

Became a Partner

1999

Founded

16

Employees

Investment Approach

The firm is built on a strong entrepreneurial culture focused on long-term value creation and has a very robust operational and risk framework set up by veterans of the hedge fund industry. Sirios Capital seeks to buy attractively-valued, growth-oriented companies of mid to large capitalization, and short stocks with deteriorating fundamentals and/or valuations.

The organization of the investment team and the investment decision making structure is unique as the portfolio coverage is split into five sector groups, each of which is the responsibility of an experienced investment principal who oversees the idea generation and quality of analysis of their sector on both long and short sides. This decentralized yet accountable structure enables deep sector expertise, agility in decision-making, and a consistent focus on long-term value creation.

Sirios Capital flagship strategy, launched in 1999, combines the flexibility of a multi-sector, diversified long/short hedge fund with the focus of an individual sector fund. This allows Sirios Capital to benefit from both portfolio management skills as it invests across sectors on a global basis, and the fundamental advantage of its focus within each sector. The investment team seeks to identify longer-term investment opportunities and will adjust weightings based on valuation and fundamentals. This consistent and robust approach has allowed the strategy to withstand multiple market cycles and adverse market conditions.