Series B Funded Advertising Startups
The 50 Series B rounds shown here span from April 2021 through November 2025, with disclosed deal sizes ranging from $100K (mediarithmics, Luxury Presence)…
The 50 Series B rounds shown here span from April 2021 through November 2025, with disclosed deal sizes ranging from $100K (mediarithmics, Luxury Presence) to $180M (GWI, London). Round volume was heaviest in 2021–2022 — Channable, ChannelEngine, Theta Lake, and Metadata all closed within weeks of each other in February–March 2022 alone. Activity slowed to seven rounds in 2023 and three in 2024, then picked up with eight closes in 2025, including ShopMy at $78M in January, Vibe at $50M in Chicago in October, and Agentio at $40M in New York in November.
Geographically, New York leads with six companies — Agentio, Circuit, RAIN, WeAre8, Anyword, and Holler — while London accounts for five: ID5, LandVault, Admix, Vidsy, and GWI. Paris adds three (Happydemics, Pitchy, mediarithmics), and 21 of the 50 companies are headquartered outside the US, with rounds spanning Germany, Netherlands, Croatia, Spain, Israel, Belgium, and India.
Most recent rounds
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Frequently asked
What are the largest Series B rounds among these advertising startups?
GWI (London) raised $180M in February 2022, the largest disclosed round in the dataset, followed by Firework at $150M in May 2022. ShopMy closed $78M in January 2025, Knowde raised $72M in August 2021, and InfoSum closed $65M the same month.
How much Series B activity has there been in advertising in 2025?
Eight of the 50 rounds closed in 2025. The largest were ShopMy ($78M, January), Vibe ($50M, Chicago, October), and Agentio ($40M, New York, November). tvScientific raised $26M in Pasadena in February, and 4.screen raised $21M in Munich in July. The most recent close in the dataset is Agentio on November 18, 2025.
Which cities are most represented among these Series B advertising companies?
New York has the highest concentration with six companies: Agentio, Circuit, RAIN, WeAre8, Anyword, and Holler. London follows with five: ID5, LandVault, Admix, Vidsy, and GWI. Paris accounts for three — Happydemics, Pitchy, and mediarithmics.
How international is the geographic spread of this Series B advertising cohort?
21 of the 50 companies are headquartered outside the US. UK-based companies form the largest non-US cluster (ID5, LandVault, Admix, Vidsy, InfoSum, GWI), followed by France (Happydemics, Pitchy, mediarithmics) and the Netherlands (Channable, ChannelEngine). Individual rounds also trace to Israel, Germany, India, Croatia, Spain, and Belgium.
What advertising sub-segments are represented in these Series B rounds?
The dataset covers connected TV and streaming (tvScientific, Firework, IRIS.TV), creator commerce (ShopMy), in-game advertising (Anzu.io, Admix), AI-driven campaign automation (Agentio, Metadata, Intellimize, Anyword), audience identity and data clean rooms (ID5, InfoSum, Attain), and ad measurement and analytics (Happydemics, MVPindex, Keen Decision Systems).
Are any round sizes undisclosed in this dataset?
Two rounds list undisclosed amounts: Significo, which closed in Austin in October 2025, and Ontheline Corporation, which closed in Las Vegas in March 2023. All other 48 rounds in the dataset include a disclosed dollar figure.
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