Partners Group has raised more than $5.5bn (£4.1bn) at the final close of its infrastructure secondaries program.

The program includes a closed-end fund at $1.7bn, with new clients representing more than 70 per cent of committed capital, as well as bespoke mandates and other vehicles that invest alongside.

Investors in the program comprised a range of institutional clients across Europe, the Americas, the Middle East, and Asia Pacific, according to the Swiss-based private markets firm.

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The infrastructure secondaries program invests in general partner-led (GP-led) transactions, limited partner-led (LP-led) portfolios, and complex situations globally, and is already over 25 per cent committed across 20 seed investments, with $2bn invested globally in the past 12 months.

One of the most recent additions to its seed portfolio is a lead investment in a continuation vehicle for a global commercial aviation leasing portfolio, which includes 69 assets across a “diversified” customer base.

Prior to this program, the firm provided exposure to the infrastructure secondaries market through its global infrastructure fund series, which is on its fifth vintage, as well as bespoke mandates.

Partners Group has raised in excess of $20bn across its latest infrastructure directs and infrastructure secondaries programs, having also recently closed its fourth direct infrastructure program at more than $15bn.

“We have one of the longest track records in the infrastructure secondaries market,” said Dr. Dmitriy Antropov, head infrastructure partnership investments at Partners Group. “Through our differentiated direct-style underwriting approach, we have been able to deliver very attractive returns across cycles. This approach positions us as a solutions provider as the infrastructure secondaries market becomes an increasingly important tool in providing liquidity to LPs and GPs alike.”

The firm, which oversees more than $186bn in assets under management globally, has investment programs and custom mandates spanning private equity, private credit, infrastructure, real estate, royalties, and special opportunities.

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