ZURICH, June 7 (Reuters) - The slide in the shares of Swiss asset manager Partners Group was a "massive overreaction," co-founder Fredy Gantner told the SonntagsZeitung newspaper, describing the company's business as "very solid."

Partners Group is limiting withdrawals from two of its evergreen funds after they exceeded the 5% quarterly limit. The announcement sent the shares down 16% on Wednesday. Its shares have lost nearly 28% in 2026 following a fall of 20% in 2025.

o The geopolitical situation was not helpful either, Gantner said, citing high uncertainty, rising interest rates and financing becoming more difficult.

o Partners Group was not the only asset manager affected, but needed to communicate better.

o Gantner, who set up the Zug-based company with Marcel Erni and Urs Wietlisbach, said he continued to hold a large stake in Partners Group and had bought additional shares recently.

o The company's day-to-day business was "very solid," Gantner said, with strong inflows of client funds during the first quarter.

(Reporting by John RevillEditing by Tomasz Janowski)