American Triple I

What American Triple I does

American Triple I (ATI) is a privately held infrastructure investment manager headquartered at 405 Lexington Avenue, New York, that invests in infrastructure projects and infrastructure-related companies across North America. The firm operates through three investment verticals: Transportation Infrastructure (public transit, airports, parking systems, cargo and cold storage), Digital Infrastructure (fiber/broadband, in-building and campus-wide digital solutions, smart city partnerships), and Social Infrastructure (water and wastewater management, energy transition, microgrids and power storage, specialized education, R&D and healthcare facilities). ATI's strategy centers on leading and participating in consortiums for middle-market public-private partnership (P3) projects and acquiring interests in infrastructure-related companies, with active equity membership and board representation to align interests across stakeholders. Notable project participations include the LaGuardia Gateway Partners consortium (Terminal B redevelopment), JFK Millennium Partners (Terminals 6 and 7 redevelopment with JetBlue as anchor tenant), the Sepulveda Transit Corridor Partners consortium alongside Bechtel and Meridiam for LA Metro's approximately $10 billion rail line, the Boeing Center at Tech Port innovation hub in San Antonio, and aeronautical facility development at Laredo International Airport with AFCO.

ATI generates revenue as a private fund investment manager, earning management fees and carried interest on infrastructure funds and co-investments; the firm does not publicly disclose financial details. Its go-to-market is relationship-driven and field-based, leveraging direct institutional investor relationships (pension funds, sovereign wealth funds), government and public-sector partnerships (cities, municipalities, transit and port authorities), and consortium-format partnerships with established developers and operators such as Bechtel and Meridiam. The firm is led by Co-Founder and Managing Partner David J. Cibrian and Co-Founder and Senior Advisor William C. Thompson (former New York City Comptroller), supported by a Chief Investment Officer, CFO/CCO, two Managing Directors, and senior advisors drawn from Aberdeen, Alinda Capital Partners, Macquarie, JPMorgan, Actis, and Vantage Airport Group.

Name

American Triple I

Legal name

American Triple I Holdings, LLC

Website

https://atipartners.com

Company type

Private

Founded year

2019

Operating status

Operating

Headcount range

1–10 employees

Short description

American Triple I is a privately held New York-based infrastructure investment manager that leads and participates in consortiums for public-private infrastructure projects across Transportation, Digital, and Social verticals in North America, primarily serving government entities and institutional investors.

Ownership category

akta.pro rank

Headquarters

HQ city

New York

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D

Revenue model

1. Fund Management: Infrastructure investment manager providing advisory services to private fund clients. Generates revenue through management fees and carried interest from infrastructure funds.

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

American Triple I (ATI) is an infrastructure investment manager that invests in infrastructure projects and companies across North America through three verticals: Transportation (public transit, airports, parking, cargo, cold storage), Digital (fiber/broadband, smart city), and Social (water/wastewater, energy transition, microgrids, specialized healthcare/education). The firm leads and participates in consortiums for major public-private partnership (P3) projects and generates revenue through management fees and carried interest from infrastructure funds it manages.

Product overview

American Triple I (ATI) is an infrastructure investment management firm offering investment management services across three vertical sectors: Transportation (public transit, airports, parking systems, cargo, cold storage), Digital (fiber/broadband, in-building/campus-wide digital solutions, smart city partnerships), and Social (water/waste-water management, energy transition/distributed power generation, microgrid systems/power storage, specialized education, R&D, and healthcare). ATI leads and participates in consortiums for infrastructure projects and acquires interests in infrastructure-related companies in North America. The firm's featured projects include the Sepulveda Transit Corridor Project (approximately $10 billion heavy-rail line), Boeing Center at Tech Port ($60 million innovation hub), LaGuardia Terminal B (P3 airport operations), and JFK Terminal 6 Development (approximately $4.2 billion terminal redevelopment).

Differentiator

Problem solved

Functional benefit

Products and services

• Infrastructure Investment Management

Quantifiable outcome

• $9 billion in terminal redevelopment projects at LaGuardia and JFK airports
• +1 more outcomes

Named customers5 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Eight partnerships are on record, tiered core and supporting.

• BechtelcoreStrategic or Co-development PartnerBechtel is a key consortium partner in Sepulveda Transit Corridor Partners (STCP), leading the development of a high-capacity underground rail line connecting the San Fernando Valley to the Westside of Los Angeles. The approximately $10 billion, 15-mile project is expected to serve over 100,000 daily riders.
• MeridiamcoreStrategic or Co-development PartnerMeridiam is a consortium partner in Sepulveda Transit Corridor Partners (STCP) for the LA Metro rail project. Meridiam specializes in public infrastructure development and investment.
• Sepulveda Transit Corridor Partners (STCP)coreStrategic or Co-development PartnerSTCP is a consortium including Bechtel, Meridiam, and American Triple I that was selected by LA Metro to develop a high-capacity, fully underground rail line. Initial operating stations planned include Metro G Line, Ventura Boulevard, UCLA, and Wilshire/Metro D Line.
• LaGuardia Gateway PartnerscoreStrategic or Co-development PartnerATI is a member of LaGuardia Gateway Partners consortium that designed, built, financed, and now operates Terminal B at LaGuardia International Airport. ATI contributed to $9 billion in terminal redevelopment projects.
• JFK Millennium PartnerscoreStrategic or Co-development PartnerATI is a member of JFK Millennium Partners consortium selected to design, build, finance, operate, and manage the new Terminal 6 at JFK International Airport, and currently operates Terminal 7. Phase 1 anticipated delivery in early 2026, final delivery in 2028.
• JetBluecoreGTM or Marketing PartnerJetBlue and JFK Millennium Partners selected American Triple I as a financing partner for the Terminals 6 and 7 redevelopment project at JFK International Airport. JetBlue serves as an anchor tenant for the redevelopment.
• AFCOsupportingStrategic or Co-development PartnerAFCO and American Triple I were selected to develop aeronautical facilities at Laredo International Airport, expanding ATI's airport infrastructure portfolio.
• Port Authority of San AntoniosupportingStrategic or Co-development PartnerATI served as specialized developer for the Boeing Center at Tech Port, a $60 million, 130,000 sq. ft. innovation hub opened in 2022 within an Opportunity Zone, supporting education, job creation, and community growth.

Scale indicators10 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Brookfield Asset Management: One of the world's largest infrastructure investment managers with $100B+ in infrastructure AUM. Comparable to ATI in core infrastructure strategy, but operates at a far larger scale and typically targets mega-deals above ATI's middle-market sweet spot.
• Global Infrastructure Partners (BlackRock): Specialist infrastructure manager, now part of BlackRock, focused on transport, energy, and digital assets including airports. Direct strategic overlap with ATI in U.S. airport concessions and transit P3 mandates.
• Blackstone Infrastructure Partners: Large-scale infrastructure platform within Blackstone with significant AUM across transport, energy, and digital infrastructure. Competes with ATI on consortium-format P3 deals, though at a higher ticket range.
• Macquarie Asset Management: Global infrastructure fund manager with multiple flagship infra funds. Several ATI team members (e.g., CIO Marc, CFO Jaeger) trained at Macquarie, making it a direct lineage peer for talent and strategy comparison.
• Carlyle Global Infrastructure: Established infrastructure platform investing across transport, energy transition, and digital in the Americas and Europe. Comparable vertical coverage and P3-style deployment, with a more diversified fund structure than ATI.
• IFM Investors: Global infrastructure investor owned by Australian pension funds, with significant U.S. transport, energy, and digital infra mandates. Comparable business model and LP base orientation, though at substantially greater AUM scale.
• KKR Global Infrastructure: Major infrastructure platform with North American funds and a track record in transit, airports, and energy. Represents a scaled incumbent peer, increasingly pushing into middle-market deals that overlap with ATI's niche.

Direct peers

• Meridiam: European-headquartered infrastructure investor specializing in long-term public infrastructure concessions, including transit and digital. Both an active consortium partner with ATI on Sepulveda and a direct competitor for U.S. P3 mandates.
• I Squared Capital: Independent infrastructure investment manager focused on middle-market transactions in transportation, digital, and energy transition infrastructure globally. Closest pure-play comparable to ATI's middle-market, multi-vertical strategy.
• Stonepeak Infrastructure Partners: North America-focused infrastructure equity manager investing across transport, digital, and energy transition. Highly comparable mid-sized peer with overlapping vertical coverage and similar ticket-size discipline.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/tripleipartners

Revenue estimate

Valuation estimate

Number of profiles

Profiles12 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about American Triple I