SEI Investments
OS

SEI Investments’s OneStream Inc OS Stock Holding History

SEI Investments’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
Q1 		– Sell
-301,913
Closed -$5.55M – 3345
2025
Q4 		$5.55M Sell
301,913
-54,138
-15% -$1.03M 0.01% 1327
2025
Q3 		$6.56M Buy
356,051
+21,729
+6% +$477K 0.01% 1196
2025
Q2 		$9.46M Buy
334,322
+69,185
+26% +$1.72M 0.01% 1010
2025
Q1 		$5.66M Buy
265,137
+113,908
+75% +$2.92M 0.01% 1207
2024
Q4 		$4.31M Buy
151,229
+35,648
+31% +$1.09M 0.01% 1366
2024
Q3 		$3.92M Buy
+115,581
New +$3.41M 0.01% 1396

Other funds holding OS

GCL
Glazer Capital LLC New York $4.71B AUM 81.93% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Temasek Holdings
Temasek Holdings Singapore $37.3B AUM 12.6% 1-Year Est. Return
Fidelity International
Fidelity International Hamilton, Bermuda $139B AUM 29.06% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
AA
AQR Arbitrage Greenwich, Connecticut $7.02B AUM 31.58% 1-Year Est. Return
NAM
Nexpoint Asset Management Dallas, Texas $1.5B AUM 83.46% 1-Year Est. Return
OCAI
O'Connor Alternative Investments New York $1.37B AUM
PAMP
Polar Asset Management Partners Toronto, Ontario, Canada $6.07B AUM 34.81% 1-Year Est. Return
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return

SEI Investments's OS Position: Q1 2026 in Review

SEI Investments sold out of OneStream Inc (OS) in Q1 2026, closing a stake of 301,913 shares — an estimated $5.55M sold.

SEI Investments first reported a position in OS in Q3 2024 and held it in 6 quarters. The position peaked at $9.46M in Q2 2025. 180 funds tracked by Wall St. Rank hold OS as of Q1 2026.

  • SEI Investments reported no remaining OneStream Inc position as of Q1 2026 after selling out during the quarter.
  • SEI Investments sold 301,913 OneStream Inc shares in Q1 2026, an estimated $5.55M.
  • SEI Investments first reported a position in OneStream Inc in Q3 2024 and held it in 6 quarters.
  • SEI Investments's OneStream Inc position peaked at $9.46M in Q2 2025.
  • 180 funds tracked by Wall St. Rank held OneStream Inc as of Q1 2026.

Based on SEI Investments's 13F filing for Q1 2026, filed 13 May 2026.