Companies beginning with O:
Oakdene Hollins
Oakham Research
Oasis PR
occams research
Ocient
Octopus Competitive Intelligence
Ocurate - acquired by FenixCommerce
Odin Answers
Ogury
Okay Human - formerly Sympler
Okendo
OKO
Okra
Olinger Group
OMB Research
OMBEA
Ometria
Omneky
Omnilytics - apparently closed 4/25
Omnisis Ltd
On Device
Onclusive
Onclusive
Oncofocus Solutions
One Minute to Midnight
OneMagnify
OnePoll
OnePulse
Online Market Intelligence (OMI)
Onswitch
Ookla
Op4G / Opinions 4 Good - suspended pending fraud allegations
Opeepl
Open Influence
Opendatasoft
OpenSincera - a brand of The Trade Desk who acquired Sincera in 2025
OpenText
OpenVault
OpenWeb
Opiniator
Opinion Matters
Opinion Research Services
OpinionLab
OpinionRoute
Opinions LTD
OpinionWay
Opinium
Opinyin
Opportune - owned by Wondrlab
Optimal Workshop
Optimizely
Optimove
Orange Sheep Research
ORB International
Orbee
Orchard
Ormax Consultants Pvt.Ltd.
Ottogrid - previously known as Cognosys - acquired by Cohere May '25
Outdoor Media Association (OMA)
OutPoint
Outra
Outsource Marketing
Outsource Research
OvationMR
Oxford Research International
Oxygen Brand Consulting
Oxynia Strategic Research