Sirios Capital Management
Sirios Capital Management is a Boston-based hedge fund founded in 2008 that runs a long/short equity strategy targeting 5-10% returns above the overnight rate. In April 2026 it expanded into Europe via a partnership with iM Global Partner, launching Europe's first performance-fee-bearing active ETF.
- Company typePrivate
- Founded2008
- HeadquartersBoston, United States
- Headcount—
- GTM typeB2B
- OfferingServices
What Sirios Capital Management does
Sirios Capital Management, L.P. is a Boston-based hedge fund founded in 2008 that operates a long/short equity strategy targeting absolute returns of 5-10% above the overnight rate across market cycles, with portfolio net exposure maintained below 30% and positions equally weighted across six sectors: consumer, financials/real estate, healthcare, industrials, and technology. The firm is structured as a Massachusetts limited partnership, headquartered at One International Place, 30th Floor, and is led by founder John Brennan. Its commercial offering historically served U.S. institutional investors and high-net-worth individuals through private fund mandates, with a $21.09 million disclosed position in Onto Innovation Inc. in Q3 2025 demonstrating active long/short portfolio management per SEC Form 13F.
In April 2026, Sirios executed its most significant strategic expansion to date by launching the iMGP Sirios Absolute Return UCITS ETF and the parallel iMGP Sirios Absolute Return Fund in partnership with Paris-based iM Global Partner. These products are structured as a Luxembourg-domiciled SICAV, available in both UCITS and ETF share classes, and represent Europe's first active ETF to charge a hedge fund-style 'high-on-high' performance fee. The partnership opens the firm's strategy to international institutional investors for the first time.
Sirios generates revenue through traditional asset management economics: recurring management fees on assets under management in the UCITS and ETF share classes, supplemented by performance fees tied to returns above a hurdle rate. Distribution is channel-partner-led via iM Global Partner's international investor network, with the ETF listed on European exchanges. The firm operates without disclosed AI/ML capabilities, patents, or external funding rounds, and detailed AUM, revenue, and ownership figures are not publicly disclosed as the entity remains a private limited partnership.
Sirios Capital Management firmographics
Firmographics- Name
- Sirios Capital Management
- Legal name
- Sirios Capital Management, L.P.
- Website
- https://sirioslp.com
- Company type
- Private
- Founded year
- 2008
- Operating status
- Operating
- Short description
- Sirios Capital Management is a Boston-based hedge fund founded in 2008 that runs a long/short equity strategy targeting 5-10% returns above the overnight rate. In April 2026 it expanded into Europe via a partnership with iM Global Partner, launching Europe's first performance-fee-bearing active ETF.
- Ownership category
- akta.pro rank
Sirios Capital Management industry classification
Industry- Product category
- Hedge Fund Management
- NAICS
- Portfolio Management and Investment Advice (52394)
- SIC
- Investment Advice (6282)
- akta.pro primary industry
- Fundamental/Discretionary Equity Long/Short (FSAHAAAA)
Keywords
Where Sirios Capital Management is headquartered
LocationHeadquarters
- HQ city
- Boston
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Sirios Capital Management business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Marketing or Sales, Infrastructure, Others
Revenue model
- Management Fees: Standard management fees charged on assets under management in the UCITS fund and ETF share classes
- Performance Fees: Hedge fund style 'high-on-high' performance fee model - first active ETF in Europe to charge a performance fee, adopting traditional hedge fund fee structures
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Annual | Performance fee on returns above hurdle rate |
Go-to-market motion2 records
Distribution channels2 records
Marketing channels1 record
Sirios Capital Management product offering
Product offeringCore offering
Sirios Capital Management is a Boston-based hedge fund manager that runs a long/short equity investment strategy targeting 5-10% returns above the overnight rate with net exposure kept below 30%. The strategy is offered to institutional investors through a Luxembourg-domiciled SICAV (iMGP Sirios Absolute Return Fund) and via Europe's first active ETF with a performance fee (iMGP Sirios Absolute Return UCITS ETF), distributed in partnership with iM Global Partner.
Product overview
Sirios Capital Management offers a long-short equity strategy through two structures: (1) the iMGP Sirios Absolute Return UCITS ETF, Europe's first active ETF with a performance fee, and (2) the iMGP Sirios Absolute Return Fund, a Luxembourg-domiciled SICAV available in UCITS and ETF share classes. Both products pursue absolute returns of 5-10% above the overnight rate with net market exposure below 30%, equally weighting positions across consumer, financials/real estate, healthcare, industrials, and technology sectors. The offerings are distributed in partnership with iM Global Partner, marking the first availability of the hedge fund's strategy to international investors.
Differentiator
Problem solved
Functional benefit
Products and services
- iMGP Sirios Absolute Return UCITS ETF Europe's first active ETF with a performance fee structure, offering Sirios Capital Management's long/short equity absolute return strategy to European investors. The fund targets 5-10% returns above the overnight rate across a market cycle while maintaining net market exposure below 30% and equally weighting positions across six sectors.
- iMGP Sirios Absolute Return Fund Luxembourg-domiciled SICAV sub-fund sub-managed by Sirios Capital Management that delivers the firm's long/short equity absolute return strategy through both UCITS and ETF share classes. Equally weights positions across six sectors (consumer, financials/real estate, healthcare, industrials, and technology) and targets 5-10% returns above the overnight rate with net exposure below 30%.
Quantifiable outcome
- 5-10% returns above overnight rate throughout market cycle
- +1 more outcomes
Companies that use Sirios Capital Management
Customer profileSegments2 records
Ideal customer profiles2 records
Sirios Capital Management technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Sirios Capital Management partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- iM Global PartnercoreBoston-based Sirios Capital Management partnered with Paris-based iM Global Partner to launch Europe's first long-short equity ETF with a performance fee. The partnership created the iMGP Sirios Absolute Return UCITS ETF, making the hedge fund manager's long/short equity strategy available to international investors for the first time through a Luxembourg-domiciled SICAV structure.
Scale indicators3 records
Recent moves6 records
Expansion highlights4 records
Sirios Capital Management competitors and assessment
Company assessmentDirect peers
- Viking Global Investors: Greenwich-based fundamental long/short equity manager with multi-sector portfolios and flexible net exposure. Closely comparable in strategy construction and institutional positioning.
- Maverick Capital: Dallas-based fundamental long/short equity hedge fund manager with multi-sector exposure and disciplined net exposure management. Closely matches Sirios's sector-diversified long/short approach.
- Greenlight Capital: New York-based fundamental long/short equity manager with concentrated value-oriented positions. Operates a similar discretionary equity strategy targeting absolute returns, comparable to Sirios.
- Pershing Square Capital Management: London-based concentrated long/short equity manager with high-conviction public-equity positions. Operates a publicly-listed vehicle providing institutional access to a long equity strategy, structurally analogous to Sirios's ETF/UCITS wrapper.
- Baupost Group: Boston-based fundamental long/short equity manager with multi-sector portfolios and absolute-return orientation. Directly comparable to Sirios in city, strategy, and target institutional client base.
- Lone Pine Capital: Greenwich-based fundamental long/short equity manager with a research-intensive, multi-sector approach. Directly comparable in strategy, structure, and target investor base to Sirios.
- Point72 Asset Management: Stamford-based fundamental long/short equity hedge fund manager. Operates a discretionary equity strategy with sector-diversified portfolios, directly comparable to Sirios's core long/short equity approach.
- Coatue Management: Long/short equity hedge fund investing across consumer, technology, and growth sectors with concentrated fundamental positions. Highly comparable to Sirios's sector-balanced long/short strategy.
Broad incumbents
- Man Group: London-listed multi-strategy hedge fund and active investment manager offering long/short equity and alternatives through UCITS and liquid-alternative structures. Larger and broader than Sirios, but the closest publicly-listed peer with comparable liquid-alternatives product distribution.
Others
- iM Global Partner: Paris-based asset management distribution platform and Sirios's Core distribution partner for the iMGP Sirios Absolute Return UCITS ETF. Ecosystem participant enabling Sirios's European expansion rather than a direct competitor.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks6 records
Key highlights6 records
Customer concentration
Sirios Capital Management financial estimates
Financial estimateRevenue estimate
Valuation estimate
Sirios Capital Management leadership team
Management profileNumber of profiles
Profiles1 record
Sirios Capital Management funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Sirios Capital Management M&A and investment
M&A and investmentM&A
Investments4 records
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Sirios Capital Management
What does Sirios Capital Management do?
Sirios Capital Management is a Boston-based hedge fund manager that runs a long/short equity investment strategy targeting 5-10% returns above the overnight rate with net exposure kept below 30%. The strategy is offered to institutional investors through a Luxembourg-domiciled SICAV (iMGP Sirios Absolute Return Fund) and via Europe's first active ETF with a performance fee (iMGP Sirios Absolute Return UCITS ETF), distributed in partnership with iM Global Partner.
Is Sirios Capital Management a public or private company?
Sirios Capital Management is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Sirios Capital Management founded?
Sirios Capital Management was founded in 2008.
Where is Sirios Capital Management based?
Sirios Capital Management is headquartered in Boston, United States, in the North America region.
How does Sirios Capital Management make money?
Two revenue lines are on record. Management Fees are the primary driver. The others are performance Fees.
Who are Sirios Capital Management's main competitors?
Direct peers on record are Viking Global Investors, Maverick Capital, Greenlight Capital, Pershing Square Capital Management, Baupost Group, Lone Pine Capital, Point72 Asset Management and Coatue Management. Man Group is listed as a broad incumbent. iM Global Partner is listed as an others.
Does Sirios Capital Management have an API?
No public API is recorded for Sirios Capital Management.
What industry is Sirios Capital Management in?
Sirios Capital Management's product category is Hedge Fund Management. Its primary akta.pro industry code is FSAHAAAA, Fundamental/Discretionary Equity Long/Short. Its NAICS code is 52394 and its SIC code is 6282.