Companies beginning with L:
LABEL Research & Consulting
LabX Media Group
Ladd Research Group
Lakamo Recruiting Co.
Lake Market Research
Lamberts Consulting
Landell Mills International
Landor & Fitch owned by WPP
Language Insight
Larta Institute
Latana
Later.com
Launchmetrics
Launchpad Research
Lava IP International Pte Ltd
Lawes Consulting
LDA Research no website
Leadfeeder - merged with Echobot, now part of Dealfront but still has own web site
Leading Edge
Leadspace
Leadsrx
LeapVision
Left Brain Marketing
Leger
Lemnisk / Immensitas Pte Ltd
lemonlime research
Lengow
Let's Talk Fresh
Lewers
Lexalytics
Leximancer
Lightdash
LiiV Group
Lillii rebranded into www.freeingreturns.com
LimeSurvey
Link Consumer Strategies
Listen+Learn
Liveminds
LiveRamp
LJE Research
LM Research & Marketing Consultancy
Locala
Localytics
Logica Research
Logit Group
LogRocket
London Economics
Lookback
Loop11
LoopMe
Loops.ai
Loyal Guru
Loyalty Research
LRW
LT Befragung und Analyse
Lucky Orange
Lumanity
LumApps
Lumenore
Luminoso
Lumoa - now part of Netigate
Lurkit
Lux Research
Luz / Particl retail database
Lynx
Lytics