People familiar with the matter said that Castle Investments' flagship hedge fund recorded a return of 10.2% in 2025, slightly lower than its main competitor Millennium Management. According to the documents, Millennium had a return of 10.5% last year, outperforming Castle's Wellington Fund for the first time since 2020. Since 1990, Millennium has outperformed Castle nine times. The documents also showed that Castle Investments did not perform as well as in 2024 — the Wellington Fund had a return of 15.2% at the time, and it was the weakest performance since 2018.

People familiar with the matter said that Castle Investments' flagship hedge fund recorded a return of 10.2% in 2025, slightly lower than its main competitor Millennium Management. According to the documents, Millennium had a return of 10.5% last year, outperforming Castle's Wellington Fund for the first time since 2020. Since 1990, Millennium has outperformed Castle nine times. The documents also showed that Castle Investments did not perform as well as in 2024 — the Wellington Fund had a return of 15.2% at the time, and it was the weakest performance since 2018.