ironSource — Tel Aviv mobile-app monetization platform; acquired by Unity Software in 2022 for $4.4B.
THE ENTITIES · OLAM.BUSINESS
Edited on Aug 29, 2026.
ironSource was the Tel Aviv-founded mobile-app monetization platform whose 2022 acquisition by Unity Software (NYSE: U) for $4.4 billion was one of the largest Israeli ad-tech transactions on record, and the defining Israeli exit in the mobile-app advertising infrastructure category. Founded in 2010 by Tomer Bar-Zeev and four co-founders, ironSource built the mediation and user-acquisition layer that let app developers monetize through in-app ads, optimize ad waterfalls, and acquire users programmatically. It listed on NYSE via SPAC in June 2021 and was acquired by Unity in November 2022. The founding team's full departure from Unity in 2024 and their subsequent $58 million Seed round for a new AI venture closed the loop on one of Israeli adtech's most-watched founder trajectories.
ironSource: Snapshot
| Founded | 2010, Tel Aviv |
|---|---|
| Founders | Tomer Bar-Zeev (CEO), Omer Kaplan, Tamir Carmi, Arnon Harish, Itay Milrad, Roi Milrad |
| Sector | Mobile-app monetization, ad-tech, in-app advertising infrastructure |
| IPO | NYSE via SPAC (Thoma Bravo Advantage), June 2021, ~$11 billion |
| Acquisition | Unity Software (NYSE: U), announced July 2022, closed November 2022, $4.4 billion all-stock |
| Shareholder outcome | ironSource shareholders received approximately 26.6% of the combined Unity entity |
| CEO at acquisition | Tomer Bar-Zeev |
| Pre-acquisition HQ | Tel Aviv |
| Post-acquisition | Absorbed into Unity Grow Solutions; ad network shut down entirely March 2026 |
| Product | Ad mediation (LevelPlay), user acquisition, app analytics, in-app bidding |
| Key investors (pre-IPO) | CPI, Saban Capital Group, Viola Credit |
| Founder team's next venture | ZyG, an AI e-commerce platform, $58 million Seed, March 2026 |
What Did ironSource Build?
ironSource built the mediation layer between app developers and ad networks, the infrastructure that decides which ad to serve inside a mobile app, when, and at what price. The platform combined ad mediation (managing multiple ad networks through a single SDK, branded LevelPlay), user-acquisition tools (letting developers buy installs programmatically), app analytics, and in-app bidding into an integrated monetization stack. The customer base was predominantly mobile-game developers, though the platform served the broader app ecosystem.
The business model was volume-based: ironSource monetized through a share of ad revenue flowing through its mediation layer. As mobile gaming grew through the 2010s, ironSource's position as the default mediation infrastructure for mid-market game studios scaled accordingly. By 2019 the company was processing tens of billions of ad impressions per month across most of the top-grossing mobile games, a commercial position rivaled only by Google's AdMob and Meta's Audience Network.
Who Founded ironSource?
ironSource was founded in 2010 in Tel Aviv by six Israeli co-founders: Tomer Bar-Zeev (CEO), Omer Kaplan, Tamir Carmi, Arnon Harish, Itay Milrad, and Roi Milrad. Bar-Zeev led the company through its entire lifecycle, founding, growth, public listing, and acquisition. The founding team originally built a desktop software-distribution platform before pivoting into mobile-app monetization around 2014, as the smartphone ecosystem scaled past what desktop-era tools could serve.
How Did ironSource Go Public and Get Acquired?
ironSource listed on the New York Stock Exchange in June 2021 via a SPAC merger with Thoma Bravo Advantage, one of the wave of Israeli tech SPACs in the 2021 window. The listing valued the company at approximately $11 billion at peak. The stock declined through 2022 alongside the broader tech correction, driven in part by Apple's App Tracking Transparency framework, which made mobile user-acquisition targeting substantially harder across the industry.
In July 2022, Unity Software announced an all-stock acquisition of ironSource for approximately $4.4 billion. The deal closed in November 2022, with ironSource shareholders receiving roughly 26.6% of the combined Unity entity. The strategic rationale was vertical integration: Unity provided the game-engine layer (the tools developers use to build games), and ironSource provided the monetization layer (the tools developers use to make money from those games). Combined, Unity could offer a create-to-monetize platform covering the full lifecycle of a mobile game. AppLovin separately attempted an unsolicited $20 billion takeover of Unity during the signing window specifically to break up the ironSource deal; Unity rejected it. The full contest is covered in ironSource and the AppLovin Merger.
Silver Lake and Sequoia Capital, both significant Unity shareholders, separately committed approximately $1 billion in convertible notes to support the transaction.
What Happened After the Unity Acquisition?
ironSource's technology was absorbed into Unity's Grow Solutions division, with Bar-Zeev joining Unity's senior leadership as division president. The Tel Aviv engineering footprint, substantial before the acquisition, continued under Unity Israel in the years immediately after the deal.
The integration proved more complicated than the deal logic anticipated. Apple's App Tracking Transparency framework compressed mobile-monetization economics industry-wide, and Unity's own September 2023 runtime-fee controversy triggered developer backlash and a leadership change, CEO John Riccitiello resigned, replaced by Jim Whitehurst, then by Matt Bromberg. In January 2024, Whitehurst announced a 25% company-wide workforce reduction alongside the mutual departure of the entire ironSource founding team: Bar-Zeev, Omer Kaplan, Eyal Milrad, Arnon Harish, Tamir Carmi, and Assaf Ben Ami. Bar-Zeev remained on the Unity board through a transition period, with his final resignation taking effect February 5, 2026.
In March 2026, Unity announced it was shutting down the ironSource ad network entirely and marketing Supersonic, the mobile-games label behind Bridge Race, Going Balls, and Build A Queen, for sale. The move ended ironSource as an operating structure inside Unity, roughly three and a half years after the merger closed. The ironSource-derived monetization business had been Unity's more stable revenue contributor through the runtime-fee turbulence, which makes the eventual full shutdown notable rather than an inevitability foretold at the deal's signing.
Where Did the ironSource Founders Go Next?
The ironSource alumni network is now one of the densest founder graphs in Israeli adtech. In March 2026, five original ironSource principals, Tomer Bar-Zeev (Chairman), Omer Kaplan (CEO), Assaf Ben Ami (CFO and COO), Nadav Ashkenazy (the former ironSource executive who ran Unity's Israeli advertising business until early 2025), and Daniel Shinar, raised $58 million in Seed funding for ZyG, an AI platform for building and scaling e-commerce brands. The round is the largest publicly disclosed Seed by an Israeli adtech alumni team since the Unity merger.
The broader founder graph, the six original co-founders plus the senior operating layer around them, is now spread across the next wave of Tel Aviv adtech, gaming, and applied-AI ventures, a pattern that echoes what Check Point's founder cohort did for Israeli cybersecurity a generation earlier.
Where Does ironSource Fit in Israeli Ad-Tech History?
ironSource sits in the lineage of Israeli companies that built infrastructure layers for digital advertising, alongside Taboola (content discovery), Outbrain (content recommendation), Perion Network (search advertising), and the broader Israeli ad-tech cohort. The $4.4 billion Unity acquisition was the largest Israeli ad-tech exit by transaction value. The Israeli ad-tech cluster, concentrated in Tel Aviv, has produced more infrastructure-layer exits per capita than any comparable ecosystem.
FAQ
What was ironSource?
A Tel Aviv-founded mobile-app monetization platform that built the mediation layer between app developers and ad networks. Founded 2010, NYSE-listed 2021, acquired by Unity Software for $4.4 billion in November 2022.
Who founded ironSource?
Six Israeli co-founders: Tomer Bar-Zeev (CEO), Omer Kaplan, Tamir Carmi, Arnon Harish, Itay Milrad, and Roi Milrad. Founded in 2010 in Tel Aviv.
How much did Unity pay for ironSource?
$4.4 billion in an all-stock transaction, announced July 2022 and closed November 2022. ironSource shareholders received approximately 26.6% of the combined Unity entity.
Why did Unity acquire ironSource?
Vertical integration: Unity provided the game engine (creation), ironSource provided the monetization layer (revenue). Combined, Unity could offer a create-to-monetize platform covering the full mobile-game lifecycle.
Is ironSource still operating?
No. In March 2026 Unity shut down the ironSource ad network entirely and put Supersonic, its mobile-games label, up for sale, ending ironSource as an operating structure roughly three and a half years after the merger closed.
What happened to the ironSource founding team?
In January 2024, Unity's interim CEO Jim Whitehurst announced the departure of the entire ironSource founding team, including Tomer Bar-Zeev, Omer Kaplan, Eyal Milrad, Arnon Harish, Tamir Carmi, and Assaf Ben Ami, alongside a 25% company-wide workforce reduction. Bar-Zeev's final board resignation took effect February 5, 2026.
What are the ironSource founders doing now?
Five original principals, Tomer Bar-Zeev, Omer Kaplan, Assaf Ben Ami, Nadav Ashkenazy, and Daniel Shinar, raised $58 million in Seed funding in March 2026 for ZyG, an AI platform for building and scaling e-commerce brands.
Did AppLovin try to acquire Unity instead?
Yes. AppLovin made an unsolicited approximately $20 billion takeover attempt for Unity in August 2022, conditioned on Unity dropping the ironSource deal. Unity rejected it within five days. The full contest is covered in ironSource and the AppLovin Merger.
How did ironSource go public?
Via SPAC merger with Thoma Bravo Advantage on the NYSE in June 2021, valued at approximately $11 billion at peak. The stock declined through 2022 before the Unity acquisition.
What is ironSource's product?
Ad mediation (LevelPlay, managing multiple ad networks through one SDK), user-acquisition tools, app analytics, and in-app bidding, an integrated monetization stack primarily serving mobile-game developers.
How does ironSource compare to Taboola and Outbrain?
Different category: ironSource operated in mobile in-app advertising infrastructure, while Taboola and Outbrain operate in web content discovery and recommendation. All three are Israeli-founded ad-tech companies that built infrastructure layers for digital advertising.
Primary Sources
Unity Software SEC filings (NYSE: U), including 2022 acquisition close disclosure (Form 10-K). ironSource SPAC merger proxy statement (2021). Unity-ironSource merger agreement (July 2022). Post-acquisition Unity earnings calls and segment reporting. Silver Lake and Sequoia Capital convertible-notes commitment. Coverage: TechCrunch, Calcalist, Globes, Reuters, The Information. Data current as of August 2026.
Related Olam Coverage
See: ironSource and the AppLovin Merger (the rejected $20B takeover contest) · Taboola · Adam Singolda · Noam Lanir · Shalom Meckenzie · The Israeli Adtech Second Wave · The Israeli Adtech Cluster
בעברית
איירונסורס הייתה פלטפורמת המונטיזציה לאפליקציות ניידות מבוססת תל אביב שנרכשה על ידי Unity Software ב-2022 תמורת 4.4 מיליארד דולר, אחת מעסקאות האד-טק הישראליות הגדולות בהיסטוריה. נוסדה ב-2010 על ידי תומר בר-זאב וחמישה שותפים מייסדים. הונפקה בנאסד"ק (SPAC) ביוני 2021. המוצר: שכבת מדיאציית פרסומות (LevelPlay), רכישת משתמשים, ואנליטיקה לאפליקציות, בעיקר למשחקים ניידים. לאחר הרכישה, הטכנולוגיה נקלטה ב-Unity Grow Solutions. בינואר 2024 עזב כל צוות המייסדים את יוניטי, ובמרץ 2026 חמישה מהם גייסו 58 מיליון דולר לחברת ZyG החדשה. יוניטי סגרה את רשת הפרסום של איירונסורס לחלוטין במרץ 2026.
The Olam Editorial Team | The Entities
