Unity's Q1 2025 earnings and Vector's cautious guidance

Unity reported its Q1 2025 earnings on 7 May, the first full quarter with Vector, the rebuilt ad model unveiled at GDC in March, running across parts of the network. Revenue for the quarter came in at roughly $435 million, and the company's own framing of the result, progress rather than proof, matched what chief executive Matt Bromberg told investors in February after Q4 2024 numbers: the ad business needed rebuilding before it could compete, and a rebuild does not resolve itself inside one reporting period.

The numbers behind Unity's Q1 2025 earnings caution

Grow Solutions, the segment that houses Unity Ads and the old ironSource network stack, has been the drag on Unity's results since the two companies merged in 2022. Q4 2024 revenue landed around $457 million with Grow still declining, and the Q1 2025 print did not reverse that trend so much as slow its rate. Management's guidance for the following quarters stayed conservative, tied explicitly to how much of the network had migrated onto Vector's new bidding and creative infrastructure by the call date rather than to a fixed recovery timeline. For a buyer reading the transcript rather than the headline, that qualification matters more than the topline figure.

The merger itself is worth remembering here, because it is the reason Unity's ad business looks the way it does today. Folding ironSource's network into Unity's engine business was pitched as a way to combine Unity's developer reach with ironSource's monetisation and mediation stack, but three years on, the combined Grow segment has spent more of that time explaining underperformance than compounding it. Vector is, in effect, Unity's second attempt at making that combination pay off, and management's caution this quarter reads as an acknowledgement that the first attempt did not.

What Bromberg is actually promising

Bromberg's public framing since February has been consistent and worth taking at face value rather than dismissing as standard executive hedging: he has described the ad business as needing to be rebuilt before it can be judged, not optimised at the margins. That is a meaningfully different claim than the one AppLovin's leadership makes about Axon, which is a story of continuous compounding improvement on an already-working model. Unity's story is a rebuild-then-compete story, and rebuild-then-compete stories have a predictable shape: a period of flat or declining headline numbers while the new infrastructure absorbs volume, followed by an inflection if the rebuild actually improves monetisation once fully live. Q1 2025 is squarely in the first phase of that shape, which is exactly why guidance stayed conservative rather than promotional.

Why Vector is a multi-quarter bet, not a one-quarter one

Vector replaces the auction and creative-serving logic Unity Ads ran on for years, and a network cannot swap that infrastructure under live advertiser budgets without a phased rollout. Unity's own commentary since GDC has described the migration in phases through the second quarter, which means the Q1 2025 numbers reflect only the earliest slice of demand and supply running on the new stack. Reading a single quarter's revenue as a verdict on whether Vector works is premature, in much the same way it would have been premature to judge AppLovin's AXON 2.0 upgrade from its first quarter running it.

That comparison is the one buyers keep making anyway, because AppLovin reported the day before Unity did. AppLovin's Q1 2025 advertising revenue came in around $1.16 billion, up roughly 71% year on year, with net income of about $576 million, a scale of growth Unity is nowhere close to matching this quarter. The comparison is not entirely fair given how differently the two ad stacks have been built and marketed, but a UA buyer allocating budget across networks does not owe either company fairness. Unity's pitch is a network worth reconsidering as Vector matures; AppLovin's is a network already compounding.

What a buyer should do with this quarter's numbers

The temptation after an earnings call like this is to treat it as a signal to shift budget wholesale, either away from Unity because the growth story is unproven, or back toward it because a cautious management team sounds more credible than an aggressive one. Neither reaction is well supported by one quarter of data. The more useful response is to treat the Vector migration as a live experiment inside Unity's own network and test it the way any new inventory source should be tested.

A short checklist for the next two quarters:

• Ask the Unity account team what percentage of served impressions are running through Vector versus legacy infrastructure, and request that split by campaign, not just network-wide.
• Where volume allows, run a held-out slice of spend on Vector-served inventory against a comparable slice on the legacy stack, rather than assuming aggregate reporting reflects either fairly.
• Track eCPM and fill-rate volatility separately from ROAS, since a mid-migration network is more likely to show short-term serving inconsistency than a genuine efficiency problem.
• Revisit the comparison after the next call rather than acting on this one alone, since Unity has signalled the migration continues through Q2 and the picture will look different by then.

The part that will not show up in a quarter's revenue

What Unity is selling with Vector is a rebuilt targeting and bidding model that, if it works, should show up first in advertiser-side efficiency before it shows up in Unity's own topline. Publishers and advertisers tend to shift discretionary budget toward better-performing inventory before a network's reported revenue reflects that shift at scale. That lag is normal, and it is also exactly why a single quarter of cautious guidance should not be read as confirmation of failure any more than it should be read as confirmation of a turnaround.

Unity's next test comes with Q2 results, by which point the phased Vector migration the company described at GDC is meant to be substantially further along. A buyer who waits for the headline number to move before adjusting a media plan will be several months behind a buyer already running the comparison test on whatever slice of Vector inventory is live today.

Related archive reading

These articles provide related context and remain subject to their stated review status.

• AppLovin's Q1 2025 Earnings and the Revised Tripledot Deal
• Q3 earnings ad networks: AppLovin and Unity diverge again