Vault-13

ONESTREAM INC OS

CL A · Common Stock · CUSIP 68278B107

0 institutional holders -180 vs Q1 2026
—reported value*
0 new 0 added 0 reduced 171 sold out net sold ≈ $2.1bn (-86.5m shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable.

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0100200Q3 24: 114Q4 24: 161Q1 25: 143Q2 25: 188Q3 25: 186Q4 25: 185Q1 26: 180Q2 26: 00Q3 24Q1 25Q3 25Q1 26Q2 26
Numbers
QuarterHolders
Q3 2024114
Q4 2024161
Q1 2025143
Q2 2025188
Q3 2025186
Q4 2025185
Q1 2026180
Q2 20260

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
2000200Q4 24: 125 bought or addedQ4 24: 42 cut or sold outQ4 24Q1 25: 100 bought or addedQ1 25: 74 cut or sold outQ2 25: 141 bought or addedQ2 25: 49 cut or sold outQ2 25Q3 25: 100 bought or addedQ3 25: 111 cut or sold outQ4 25: 97 bought or addedQ4 25: 103 cut or sold outQ4 25Q1 26: 121 bought or addedQ1 26: 118 cut or sold outQ2 26: 0 bought or addedQ2 26: 171 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q4 202412542
Q1 202510074
Q2 202514149
Q3 2025100111
Q4 202597103
Q1 2026121118
Q2 20260171

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$5m$10m$15mQ3 25 calls: $11.9mQ3 25 puts: $4.9mQ3 25P/C 0.41Q4 25 calls: $5.6mQ4 25 puts: $3.6mQ4 25P/C 0.64Q1 26 calls: $2.5mQ1 26 puts: $2.9mQ1 26P/C 1.17Q2 26 calls: $0Q2 26 puts: $0Q2 26P/C —
Numbers
QuarterCallsPutsP/C
Q3 2025$11.9m$4.9m0.41
Q4 2025$5.6m$3.6m0.64
Q1 2026$2.5m$2.9m1.17
Q2 2026$0$0—

Biggest buyers

None

Biggest sellers

GLAZER CAPITAL, LLC Sold out -7,537,536-7.5m
VANGUARD PORTFOLIO MANAGEMENT LLC Sold out -4,900,450-4.9m
Temasek Holdings (Private) Ltd Sold out -4,266,714-4.3m
FIL Ltd Sold out -3,992,145-4.0m
VANGUARD CAPITAL MANAGEMENT LLC Sold out -3,882,231-3.9m
AQR Arbitrage LLC Sold out -3,393,367-3.4m
NEXPOINT ASSET MANAGEMENT, L.P. Sold out -3,358,217-3.4m
Polar Asset Management Partners Inc. Sold out -2,944,378-2.9m
MILLENNIUM MANAGEMENT LLC Sold out -2,471,107-2.5m
BlackRock, Inc. Sold out -2,339,550-2.3m

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
KKR Dream Holdings LLC 13G · exempt (held before listing) filed 2025-02-12 67.5% 94.5m 2025-02-12
Shea Thomas Anthony 13G · exempt (held before listing) filed 2026-02-13 16.3% 18.2m 2026-02-13
Colby Craig 13G · exempt (held before listing) filed 2025-05-14 10.9% 9.1m 2025-05-14
GLAZER CAPITAL, LLC 13G · passive investor new · filed 2026-02-09 6.8% new 6.2m 2026-02-09

Fell to 5% or below in the last year: DARLINGTON PARTNERS CAPITAL MANAGEMENT, LP (0.0%, 2026-05-15), T. Rowe Price Investment Management, Inc. (0.0%, 2026-05-15), KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC (0.0%, 2026-05-14), NORGES BANK (0.2%, 2026-05-11), VANGUARD GROUP INC (0.0%, 2026-03-27), Champlain Investment Partners, LLC (3.3%, 2026-02-12)

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change