I am still adding to the list.
Australia
Sydney/MelbourneAnimal Logic - http://www.animallogic.com/
Brasil
São PauloVagalume Animation Studios - http://www.vagalumestudios.com.br/
Belgium
Walking the Dog - http://www.walkingthedog.be
Dream Wall - http://www.dreamwall.be
Beast Animation - http://www.beastanimation.be
3 Little Pix - http://www.3lp.be
Canada
LondonDigital Extremes - http://www.digitalextremes.com/
Montreal
Behaviour Interactive - http://www.bhvr.com/
Cinesite - http://www.cinesite.com
FAKE Studio - http://www.fake-studio.com/
Framestore - http://www.framestore.com/
Kutoka - http://www.kutoka.com/
Moving Picture (MPC) - http://www.moving-picture.com/
newbreed visual effects - http://www.newbreedvfx.com/
Oblique FX - http://www.obliquefx.com/
POP6 - http://www.pop6.net/
Proxy Studio - http://www.proxystudio.squarespace.com/
Rodeo FX - http://www.rodeofx.com/
SHED - http://shedmtl.com/
Vision Globale - http://www.visionglobale.ca/
Québec
HYBRIDE A Ubisoft Division - http://hybride.com/
Sudbury
Gallus Entertainment - http://www.gallusentertainment.com/
Toronto
567 VFX - http://www.567vfx.ca/
Arc Productions - http://www.arcproductions.com/
Elliot Animation - http://www.elliottanimation.com/
Eggplant Pictures - http://www.eggplantpictures.com/
Industrial Brothers - http://www.industrialbrothers.com/
Intelligent Creatures - http://www.intelligentcreatures.com
Kerosene VFX - http://www.kerosenevfx.com/
Mr. X Inc - http://www.mrxfx.com
Rocket Science VFX - http://www.rsvfx.com/
Soho VFX - http://sohovfx.com/
six01 Digital Media - http://www.six01.com/
Spin VFX - http://www.spinvfx.com/
Stargate Studios - http://www.stargatestudios.net
The Studio Up Stairs - http://www.thestudioupstairs.com/
Tendril Design + Animation Inc - http://studio.tendril.ca/
Toonbox Entertainment - http://www.toonboxent.com/
TOPIX FX - http://topixfx.com/
Zink - http://zink.ca/
Vancouver
Atmosphere vfx - http://www.atmosphere-vfx.com/
Digital Domain - http://www.digitaldomain.com
The Embassy - http://theembassyvfx.com/
Halon vfx - http://www.halon.com/
Hydraulx - http://www.hydraulx.com/
Image Engine - http://image-engine.com/
Method Studios - http://www.methodstudios.com/
Nerd Corps - http://www.nerdcorps.com/
Pixel Magic fx - http://www.pixelmagicfx.com/
Prime Focus World - http://www.primefocusworld.com/
Rainmaker - http://www.rainmaker.com/
Rhythm and Hues - http://www.rhythm.com/
Stargate Studios - http://www.stargatestudios.net
Sony Pictures Imageworks - http://www.imageworks.com/
Waterproof Studios - http://www.waterproofstudios.com/
Dubai
Stargate Studios - http://www.stargatestudios.net
France
Montpellier
Dwarf Animation Studio - http://www.dwarf-labs.com/
Germany
Belgium
Niceberg - http://www.niceberg.be/
Berlin
Stargate Studios - http://www.stargatestudios.net
Dresden
Pixable Studios - http://www.pixable.de/
Stuttgart
Mackevision - http://www.mackevision.de/
Stargate Studios - http://www.stargatestudios.net
Netherlands
AmsterdamGlassworks - http://www.glassworksamsterdam.nl/
Spain
BarcelonaGlassworks - http://www.glassworksamsterdam.nl/
Onirikal - http://www.onirikal.com
Granada
Kandor Graphics - http://www.kandorgraphics.com/
Madrid
Lightbox Entertainment - http://www.lbox.es/
Sweden
StockholmImportant Looking Pirates VFX - http://ilpvfx.com/
Magoo 3d Studios - http://www.magoo3dstudios.com/
South Korea
Dexter Studios - http://www.dexterstudios.com/
South Africa
Triggerfish Animation Studios - http://www.triggerfishstudios.com/
United Kingdom
LondonBustykelp - http://www.bustykelp.com/
Glassworks - http://www.glassworks.co.uk/
Halon vfx - http://www.halon.com/
Hydraulx - http://www.hydraulx.com/
Jellyfish Pictures - http://www.jellyfishpictures.co.uk/
Kettle Studios - http://www.kettlestudio.co.uk/
Method Studios - http://www.methodstudios.com/
Middlesbrough
Bloom Studio - http://www.bloom-studio.com/
United States
Berkeley, CaliforniaTippett Studios - http://www.tippett.com/
Orange County, California
Carbine Studios - http://www.carbinestudios.com/
Santa Monica
a52 - http://www.a52.com/
Comen vfx - http://www.comenvfx.com/
Halon vfx - http://www.halon.com/
King & Country vfx - http://www.kingandcountry.tv/
Luma Pictures - http://www.lumapictures.com
Naughty Dog - http://www.naughtydog.com
Reel FX - http://www.reelfx.com/
Shade vfx - http://www.shadevfx.com/
Treyarch - http://www.treyarch.com/
Los Angeles, California
Blur - http://www.blur.com
Buck - http://www.buck.tv/
CoSA vfx - http://www.cosavfx.com/
Digital Domain - http://www.digitaldomain.com
Dreamworks Animation - http://www.dreamworksanimation.com/
Entity FX - http://www.entityfx.com/
FUSE FX - http://fusefx.com/
Hydraulx - http://www.hydraulx.com/
IXOR - http://www.ixorvfx.com/
Method Studios - http://www.methodstudios.com/
The Mill - http://www.themill.com/
Prime Focus World - http://www.primefocusworld.com/
Proof vfx - http://www.proof-inc.com/
Shilo - http://www.shilo.tv
Sprite Animation - http://www.spritee.com/
Stargate Studios - http://www.stargatestudios.net
The Creative Cartel - http://www.the-cartel.com/
The Third Floor - http://www.thethirdfloorinc.com
Zoic Studios - http://www.zoicstudios.com
Wethersfield, Connecticut:
Xvivo - http://www.xvivo.net/
Greenwich, Connecticut:
Blue Sky Studios - http://blueskystudios.com/
Atlanta, Georgia:
Artifact - http://www.artifactdesign.com/
Artistic Image - http://artisticimage.com/
Method Studios - http://www.methodstudios.com/
Stargate Studios - http://www.stargatestudios.net
Chicago, Illinois:
Method Studios - http://www.methodstudios.com/
Detroit, Michigan:
Method Studios - http://www.methodstudios.com/
Farmington Hills, Michigan:
digital image - http://www.dimage.com/
Minneapolis, Minnesota
3D Creative Factory - http://www.3dcharacterfactory.com/
Afterglow Studios - http://www.afterglowstudios.com
Ciceron - http://www.ciceron.com/
Crash Sues - http://www.crash-sues.com/
Destineer Games - http://destineergames.com/
Duffy & Partners - http://www.duffy.com/
Flurry Studios - http://www.flurry-studios.com/
FolkLore Studio - http://folklorestudio.com/
Fuse Animation - http://www.fuseanimation.com/
Gasket Studios - http://gasket.tv/
Ghost Productions - http://ghostproductions.com/
HDMG - http://www.hdmg.com/
Hybrid Medical Animation - http://www.hybridmedicalanimation.com/
MAKE Visual - http://makevisual.com/
Meditech - http://gomeditech.com/
Meet Neighbor - http://www.meetneighbor.com/
Motion 504 - http://www.motion504.com/
Pixel Farm Digital - http://www.pixelfarmdigital.com/
Propulsion Studios - http://propulsionstudios.net/
Puny Entertainment - http://punyentertainment.com/
Rising Star Studios - http://www.risingstarstudios.com/
Shinebox - http://www.theshinebox.com/
Space 150 - http://www.space150.com/
Splice - http://splice.tv/
Volt Studios - http://www.voltstudios.tv/
White Rice Productions - http://www.whitericeprod.com/
Zeus Jones - http://www.zeusjones.com/
St. Paul, Minnesota
Scales Advertising - http://www.scalesadvertising.com/
Nashville, Tennessee:
Magnetic Dreams - http://www.magneticdreams.com/
New York, New York:
Brainstorm Digital - http://www.brainstorm-digital.com/
Buck - http://www.buck.tv/
Hydraulx - http://www.hydraulx.com/
Shade vfx - http://www.shadevfx.com/
The Mill - http://www.themill.com/
The Molecule - http://www.themolecule.com
Portland, Oregon:
Laika - http://www.laika.com/
Dallas, Texas
Reel FX - http://www.reelfx.com/