Top California AdTech Companies (824)

We are an omnichannel customer acquisition platform with offices throughout the US, Canada and Europe. System1 builds desktop and mobile apps, search engines, and online publications that empower consumers with information while respecting their privacy. We also operate brands that include CouponFollow, Startpage and MapQuest. System1 is a champion of AI technology, investing in the first legal AI called Vinny...

We solve for advertising campaign and creative complexities - both key elements to the time/money savings and performance that brands, agencies and businesses seek. Our unified platform combines media, creative, and intelligence, offering end-to-end workflows powered by AI across the open and closed web. With over 700 brands and advertisers, we've proven that dynamic and personalized creative makes advertising impactful. We...

Zeta Global (NYSE: ZETA) is the AI Marketing Cloud that leverages advanced artificial intelligence (AI) and trillions of consumer signals to make it easier for marketers to acquire, grow, and retain customers more efficiently. Through the Zeta Marketing Platform (ZMP), our vision is to make sophisticated marketing simple by unifying identity, intelligence, and omnichannel activation into a single platform –...

Liftoff is a leading AI-powered performance marketing platform for the mobile app economy. Our end-to-end technology stack helps app marketers acquire and retain high-value users, while enabling publishers to maximize revenue across programmatic and direct demand. Liftoff’s solutions, including Accelerate, Direct, Monetize, Intelligence, and Vungle Exchange, support over 6,600 mobile businesses across 74 countries in sectors such as gaming, social, finance,...

ClickMint pairs proprietary generative-AI diagnostics with senior CRO operators to uncover friction, launch precision tests, and unlock compounding gains—helping high-growth e-commerce brands scale faster without buying more traffic. Founded by the creator of one of the nation’s top-performing digital marketing firms—honored by Inc. as a Fastest-Growing Company for seven consecutive years and ranked among the Top 50 U.S. marketing agencies...

Genius Sports is the layer between what happens on the field and how the world engages with it. Our solutions across the global sports ecosystem are underpinned by our next generation big data and artificial intelligence platform, GeniusIQ. By ingesting and computing multiple real-time data feeds, GeniusIQ powers a wide range of functions and applications across sports performance and officiation, fan engagement,...

OpenX is focused on unleashing the full economic potential of digital media companies. We do this by making digital advertising markets and technologies that are designed to deliver optimal value to publishers and advertisers on every ad served across all screens. We’re an independent omni-channel supply-side platform (SSP) and a global leader in supply-side targeting, transparency, and sustainability. Through our...

Attain is the most trusted and comprehensive source for permissioned, real-time purchase data in the United States. By connecting directly with over 10 million consumers, Attain delivers unmatched accuracy and scale across audience activation, insights, and in-flight optimization, and measurement, helping marketers tie every dollar of media to real-world sales outcomes. Attain’s portfolio of owned and operated apps, spanning financial...

From film, television, news, theme parks, interactive media, and streaming, our people are at the center of it all. ​Here, we solve complex and business-critical problems. That’s why we’re looking for people to help us continue our evolution, imagining and delivering the most innovative and disruptive products and services through the latest tech advancements in the industry. ​ Here you...

DISQO’s mission is to build the world’s most trusted ad measurement platform that fuels brand growth. The world’s largest brands, agencies, and media companies trust DISQO for expert insight and AI-driven intelligence about their advertising performance across all platforms. We capture people’s sentiments and journeys, connecting them with the brands they value and the media they consume. With this identity-based...

At Edmunds, we’re driven to make car buying easier. Ever since we began publishing printed car guides in the 60's, the company has been in the business of trust, innovating ways to empower and support car shoppers. When Edmunds launched the car industry’s first website in 1995, we established a leadership position online and have never looked back.

Taboola empowers businesses to grow through performance advertising technology that goes beyond search and social and delivers measurable outcomes at scale. Taboola works with thousands of businesses who advertise directly on Realize, Taboola’s powerful ad platform, reaching approximately 600M daily active users across some of the best publishers in the world. Publishers like NBC News, Yahoo, and OEMs such as Samsung,...

Super-charged customer acquisition. Centerfield delivers outcome-based digital marketing solutions and personalized omnichannel experiences for the world’s leading brands. Powered by our proprietary Dugout platform, Centerfield acquires customers at scale for leading residential service, insurance, e-commerce and B2B brands. Centerfield’s digital experiences and digital brands, such as Business.com and BroadbandNow.com, reach more than 150 million in-market shoppers annually. Centerfield is headquartered...

Together, we power advertising that enables billions of people to stay informed, entertained, and connected. We introduce them to new ideas, products, and services that make their lives better. And we help media owners of all sizes realize their full potential. That’s a lot — that’s the power of advertising. But it’s only possible with great technology. And that’s where Magnite...

People Inc. is America’s largest digital and print publisher. Our 40+ iconic and fast-growing brands harness the best intent-driven content, the fastest sites, and the fewest ads to help nearly 200 million people every month, including 95 percent of US women, make decisions, take action, and find inspiration. People Inc. brands include PEOPLE, Better Homes & Gardens, Verywell, FOOD &...

GumGum is the contextual-first technology leader transforming digital advertising with AI-powered, non-invasive data and media solutions. We champion effective advertising that uplifts and respects consumers. Our proprietary Contextual, Attention, and Creative solutions create the perfect match between a brand and a consumer in the right moment and mindset. Founded in 2008, GumGum is headquartered in Santa Monica, California, and operates...

Named “Most Innovative Agency” by Campaign US, Canvas Worldwide is an independent media agency that provides ingenious solutions for brands looking to challenge the status quo. And as a mission-based agency, our rallying cry, "Challenge the Comfortable," is our team philosophy to push outside our comfort zones to solve problems in new ways – because there can be no greatness...

NeoReach’s mission is to empower Creators by transforming their influence into sustainable income streams. We are committed to elevating their passion into a thriving profession, leveraging their unique storytelling abilities and diverse audiences to craft engaging and authentic brand narratives that resonate on a global scale. Our approach is both tech-enabled and human-focused, seamlessly integrating cutting-edge technology with a deep understanding...

TEAM LEWIS provides full PR, marketing and digital services to drive tangible results for clients around the world. Its agile approach allows brands to adapt to market opportunities and win the war for relevance. Consistently named as one of the industry's fastest-growing agencies, TEAM LEWIS has 550 staff across 24 offices throughout Asia, Europe and North America.

Sid Lee is a big-hearted, multidisciplinary creative community known for crafting bold ideas that are rooted in design and informed by culture. Their 700 professionals work as one team from offices in Montréal, Toronto, New York, Paris, London, Los Angeles and Seattle. Driven by the power of community, Sid Lee helps organizations grow through brand building, brand expression and brand...