In the firm's second year it had its first major milestone, launching a US$150 million small & midcap fund focused on investments in German-speaking Europe.

According to Institutional Investor magazine, this is partly due to the lack of competition at the time in Europe compared to North America.

In the same article, co-founder Alfred Gantner stated “you had to explain the term to people because ‘private equity’ in the way we understand it today did not exist, it was called Risikokapital, risk capital, which was associated with venture capital.”[9] In 1998, it completed a secondary transaction involving the private equity portfolio of Royal Dutch Shell’s U.S. pension fund for US$265 million.

[16] In March 2005, the investment firm opened its first UK-based office in London due to its growing investor base in the region.

[19] Two years after launching its first Asian private equity fund, the firm expanded its presence in Asia with the opening of its Japanese office in the country's capital Tokyo.

[20] As an early investor in Swiss-based semi-conductor manufacturer u-blox, Partners Group benefitted when the company announced it would be going public by the end of 2007.

[28] In July 2013, Partners Group announced the planned appointment of Christoph Rubeli and André Frei as co-CEOs, replacing Steffen Meister who had held the role since 2005.

[30] Later that year, Partners Group and Duke Street Capital joined forces to acquire Voyage Care for £375 million, a specialist support company based in the UK.

[32] In London it acquired the 80 Fenchurch Street site next to Aldgate tube station, with plans to construct a 245,000sq ft office building in a joint venture with Marick Real Estate.

[35] In January 2018, Royal Dutch Shell purchased the company's 44% minority interest in solar energy firm Silicon Ranch for an estimated $200 million.

[44] Partners Group entered into a major cooperation with UBS in the form of a new private markets solution for its wealth management clients, targeting an annual investment capacity of US$1‐3 billion over time.

[45][46][47][48] During the same year, MidRail accused Partners Group of violating a non-disclosure agreement, which allegedly impacted the bidding process for acquisition target Patriot Rail.

[54] Partners Group led a consortium in the biggest Swiss 2022 venture capital investment in cleantech company Climeworks, the world's largest direct air capture and storage plant.

[55] Also in 2022, Partners Group invested USD 500 million in Budderfly, an energy-as-a-service company that provides energy efficient systems to businesses.

[64] In April, Partners Group continued its focus on decarbonisation, when it agreed to buy 7,000 credits generated by Climeworks’ direct air capture (DAC) facilities.

[65] The firm entered into a partnership with Canadian-based Bank of Montreal (BMO) to launch a private assets fund for smaller investors.

[68] In early 2024, Partners Group announced that it was expanding its investments in the PBSA (purpose built student accommodation) real estate sector.

[73] In July of that year, it was announced Partners Group would be acquiring a majority share in the Portuguese biotech firm, FairJourney Biologics.

[76] Also in July, the company announced it was set to acquire Eteck, a market-leading provider of sustainable decentralised heating and cooling solutions in the Netherlands.

[80] In the same month, Partners Group successfully completed a USD 1.9 billion equity investment in portfolio company Edgecore Digital Infrastructure.

The investment is the second equity capital raise that Partners Group led since acquiring EdgeCore in 2022 and was conducted in conjunction with the firm's clients.

[85] Neara’s digital modeling technology enables utilities to adopt a more proactive approach to network optimization, with simulations that surface safety and reliability risks and identify the most effective remediation actions.

This included a one-month paid sabbatical every five years for employees to recharge and regular hikes up Wildspitz, located close to the Partners Group's Zug office.

[89] Robert Collins, Co-Head of Private Wealth at Partners Group, spoke about the growing need for tailored investments for individual investors.

[90] During the same year, Pensions & Investments magazine ran an article about Partners Group and its early adoption of generative AI and how the move was supported by senior executives.