13F Insight
DOSSIER · 13F Holders · Q1 2026Technology · Services-Prepackaged SoftwareCheap mega-capRe-rated
OS

ONESTREAM INC

196 institutions still hold ONESTREAM INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 68278B107·Services-Prepackaged Software·196 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 5.0%
vs prior quarter
13F value held
$1.3B
47.0% inst. owned
of float
Holders
196
-117 QoQ
filers reporting
Activity
+57 / −41
+819 added · −722 reduced
this quarter
Concentration
8.93%
Vanguard Portfolio Management #1
top holder share
AI Holders Summary · Q1 2026

196 institutions reported OS in Q1 2026. Vanguard Portfolio Management leads at 8.9% of the visible book. -117 net institutions QoQ — distribution reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
Vanguard Portfolio Management
CIK 0002100121
$118M4.9M0.01%Q1 202602
Temasek Holdings (Private) Ltd
CIK 0001021944· Sovereign
$102M4.3M0.34%Q1 202603
FIL Ltd
CIK 0000318989
$96M4.0M0.07%Q1 202604
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$93M3.9M0.00%Q1 202605
NEXPOINT ASSET MANAGEMENT, L.P.
CIK 0001469877
$81M3.4M5.41%Q1 202606
O'Connor Alternative Investments LLC
CIK 0002081629
$76M3.2M6.55%Q1 202607
Polar Asset Management Partners Inc.
CIK 0001326389
$71M2.9M1.41%Q1 202608
DARLINGTON PARTNERS CAPITAL MANAGEMENT, LP
CIK 0001854440
$71M3.8M2.82%Q4 202509
BROWN ADVISORY INC
CIK 0001345929
$62M3.4M0.09%Q4 202510
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$59M2.5M0.02%Q1 202611
BlackRock, Inc.
CIK 0002012383
$56M2.3M0.00%Q1 202612
UBS Group AG
CIK 0001610520
$54M2.3M0.01%Q1 202613
Man Group plc
CIK 0001637460
$53M2.2M0.10%Q1 202614
MARSHALL WACE, LLP
CIK 0001318757
$51M2.8M0.05%Q4 202515
TimesSquare Capital Management, LLC
CIK 0001313816
$49M2.7M0.74%Q4 202516
GOLDMAN SACHS GROUP INC
CIK 0000886982
$48M2.0M0.01%Q1 202617
Pentwater Capital Management LP
CIK 0001425851
$45M1.9M0.24%Q1 202618
First Trust Capital Management L.P.
CIK 0001604488
$44M1.8M2.32%Q1 202619
SOROS FUND MANAGEMENT LLC
CIK 0001029160
$44M1.8M0.48%Q1 202620
CITADEL ADVISORS LLC
CIK 0001423053
$43M2.4M0.01%Q4 2025
Page 1 of 10
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