Investor · Stamford, CT
O. A. Halvorsen
Open O. in the network graph →Filings
158
SEC Form D
Connections
145
co-filers
Capital
$246.1B
across filings
Active
Jan 2014
to Oct 2025
Most-connected co-filers (145)
David C. Ott · Stamford, CT134 sharedViking Global Investors LP · Greenwich, CT103 sharedVictor Elkind · La Jolla, CA100 sharedNiel J. Robertson · Boulder, CO98 sharedRose C. Shabet · Stamford, CT90 sharedViking Global Performance LLC · Greenwich, CT64 sharedJie Situ · LONDON, United Kingdom58 sharedGene Weil · New York, NY58 sharedDaniel S. Sundheim · New York, NY43 sharedAdam C. Blackman · Cleveland, OH37 sharedViking Long Fund GP LLC · Greenwich, CT28 sharedViking Global Opportunities GP LLC · Greenwich, CT23 sharedCharles D. Bryceland · New York, NY21 sharedMarc L. De Saint Phalle · New York, NY19 sharedThomas W. Purcell · New York, NY18 sharedStephen J. Strnisha · Cleveland, OH14 sharedDavid Polli · Bannockburn, IL13 sharedGeneral Partner of Issuer EMC Capital Advisors, LLC · Bannockburn, IL13 sharedSkip Glass · Mountain View, CA12 sharedJim Simons · Mountain View, CA12 sharedBeste P. Portnoff · New York, NY12 sharedRobin Gerth · Bannockburn, IL11 sharedGreg Sands · San Francisco, CA11 sharedPeter J. Langas · New York, NY10 shared
Recent filings (158)
Viking Global Opportunities LPOct 2025 · 9 co-filersViking Global Opportunities III LPOct 2025 · 9 co-filersViking Global Equities II LPOct 2025 · 9 co-filersViking Partners Long Fund LPOct 2025 · 9 co-filersViking Global Opportunities III LPOct 2025 · 9 co-filersViking Partners Long Fund LPOct 2025 · 9 co-filersViking Long Fund LPOct 2025 · 9 co-filersViking Partners Fund LPOct 2025 · 9 co-filersViking Global Equities LPOct 2025 · 9 co-filersViking Long Fund LPOct 2025 · 9 co-filersViking Partners Fund LPOct 2025 · 9 co-filersViking Global Equities II LPOct 2025 · 9 co-filersViking Global Opportunities LPOct 2025 · 9 co-filersViking Global Equities LPOct 2025 · 9 co-filersViking Global Opportunities Vintage IV (Onshore) LPSep 2025 · 10 co-filersViking Global Opportunities Vintage IV (Offshore) LPSep 2025 · 10 co-filersViking Global Opportunities Vintage IV (Onshore) LPSep 2025 · 10 co-filersViking Global Opportunities Vintage IV (Offshore) LPSep 2025 · 10 co-filersViking Global Opportunities III LPOct 2024 · 10 co-filersViking Global Equities II LPOct 2024 · 10 co-filersViking Global Equities II LPOct 2024 · 10 co-filersViking Global Opportunities LPOct 2024 · 10 co-filersViking Partners Long Fund LPOct 2024 · 10 co-filersViking Partners Long Fund LPOct 2024 · 10 co-filersViking Long Fund LPOct 2024 · 10 co-filers
Derived from public SEC Form D (Reg D) filings; entities resolved probabilistically. See O. in the interactive graph →