Bill Ackman’s Pershing Square Holdings is having a stellar 2019. It's seen a YTD (year-to-date) gain of 48.9% as per its letter to shareholders.

source https://finance.yahoo.com/m/b8259fcb-9e12-33c9-a50e-f7d05c7ec537/pershing-has-outperformed-ytd.html?.tsrc=rss