Water Island Capital’s OneStream Inc OS Stock Holding History

Water Island Capital’s Portfolio OS Stock Details OS Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	–	Sell	-91,120	Closed	-$2.19M	–	138
2026 Q1	$2.19M	Buy	+91,120	New	+$2.14M	0.24%	53

Water Island Capital's OS Position: Q2 2026 in Review

Water Island Capital sold out of OneStream Inc (OS) in Q2 2026, closing a stake of 91,120 shares — an estimated $2.19M sold.

Water Island Capital first reported a position in OS in Q1 2026 and held it in 1 quarter. The position peaked at $2.19M in Q1 2026. 0 funds tracked by Wall St. Rank hold OS as of Q2 2026.

Water Island Capital reported no remaining OneStream Inc position as of Q2 2026 after selling out during the quarter.
Water Island Capital sold 91,120 OneStream Inc shares in Q2 2026, an estimated $2.19M.
Water Island Capital first reported a position in OneStream Inc in Q1 2026 and held it in 1 quarter.
Water Island Capital's OneStream Inc position peaked at $2.19M in Q1 2026.
0 funds tracked by Wall St. Rank held OneStream Inc as of Q2 2026.

Based on Water Island Capital's 13F filing for Q2 2026, filed 14 Aug 2026.