The Market Data First
KPMG dropped their Q1 2026 M&A report this week and the headline number deserves context before you panic or celebrate: overall deal values in TMT are up 88.3% year-over-year to $446B, while deal count is down. Fewer deals, bigger checks. That’s the macro story.
Dig into the sector breakdown and advertising looks roughly flat; 142 deals in Q4 2025, 145 in Q1 2026. Not a collapse, not an explosion. The more interesting signal is the strategic vs. PE split: 864 strategic deals versus 495 PE-backed deals in Q1. Strategic is decisively outpacing financial buyers, and the gap is widening.
Christian’s prediction: Q2 is going to show an uptick. The deal activity we’ve been tracking in real time. Accenture, Shamrock, Mountaingate, the AI infrastructure plays, and a steady stream of deals happening quietly without press releases points to acceleration, not contraction. The data will confirm it in July or August, we hope!
The Deal: Anthropic Acquires Stainless
On May 18th, Anthropic announced the acquisition of Stainless, a New York-based developer tools startup founded in 2022 by Alex Ratray, a former Stripe engineer. The reported deal value: more than $300M (we estimate 20x revenue). The team size: approximately 80 people. For context, Stainless raised a $25M Series A in December 2024 at roughly a $150M valuation. The reported acquisition price is approximately double that for a company that’s not yet two and a half years old.
What Stainless does: Stainless builds software that turns API specifications into ready-to-use SDKs across programming languages — Python, TypeScript, Go, Java, and others. In plain terms: if you’re building an AI product and you want developers to be able to connect to your platform, Stainless generates the developer plumbing automatically. It’s the connective tissue between AI platforms and the developers building on top of them.
Who Stainless was building that plumbing for: OpenAI. Google. Cloudflare. Perplexity. A long list of AI and fintech platforms. Stainless was a shared supplier to essentially the entire AI industry, including Anthropic’s biggest competitors.
What Anthropic is doing with it: Winding down all hosted Stainless products. Not immediately — existing customers keep the SDKs they’ve already generated. But they lose the platform that auto-updates those SDKs as APIs evolve. That’s not a minor inconvenience. SDK drift is a real operational problem. Every platform that relied on Stainless now needs to build, find, or fund an alternative.
This Is Not an AI Tuck-In. This Is Capture the Flag.
We covered five AI tuck-ins a couple of weeks ago — Carta, MoonPay, Celonis, Nominal, Coupa — all structured as capability additions. Small specialized teams acquired to add a layer to the acquirer’s platform. Clean, straightforward, benign to the broader ecosystem.
Stainless is a different deal shape entirely. Anthropic didn’t just buy a capability. They bought a shared supplier specifically so their competitors can no longer use it.
This is competitive denial M&A. The goal isn’t only to get stronger. It’s to make competitors weaker simultaneously. One transaction, two outcomes.
Ayelet’s framing for any startup listening: if you’re building infrastructure that multiple competing platforms are all dependent on, you just watched your neutral position disappear. Shared suppliers are no longer safe in the AI era. You are an acquisition target — and not necessarily for the capability you’ve built. You might be acquired specifically so someone else can’t have you.
Anthropic’s Acquisition Pattern
Stainless is Anthropic’s fifth acquisition in roughly six months:
December: Bun (JavaScript runtime) February: Vercept (computer use agents), April: Frontrun (AI-native trading) and Coefficient Bio (AI biotech team) May: Stainless (SDK and connectivity tooling).
The through line across the first three: small specialized teams acquired to make Claude better. Focused capability additions, priced large against the target’s revenue but small against Anthropic’s own massive funding base.
Stainless fits the capability story too, but it’s also the first deal in the sequence with an explicit competitive denial dimension. That’s a meaningful escalation in the acquisition strategy.
Vishal Kumar Gupta is Head of M&A at Anthropic. Legal representation has been consistent across financings and acquisitions through formation counsel. No financial advisor disclosed on either side.
The MCP Connection
Christian raised the angle that didn’t make the headlines: Model Context Protocol.
MCP is an open source standard for connecting AI applications to external systems. The simple version: it’s how you connect Claude to Slack, or Google Drive, or a CRM, or any external tool. The more sophisticated version: in a media or agency context, agentic actions — autonomously buying an out-of-home placement, executing a Meta campaign, pulling real-time performance data - all require connectivity through MCP servers.
Some major platforms already have MCPs. Meta’s Ad Manager has one. But significant parts of the media ecosystem — smaller channels, niche platforms, legacy inventory sources don’t yet. And building those connections is genuinely hard, requiring technical depth and security rigor that most teams underestimate.
Anthropic’s investment in Stainless is probably not only a block against competitors. It’s almost certainly an aggressive move to expand MCP coverage — to make Claude connectable to more things, more reliably, faster. One of the most consistent friction points for anyone building seriously on Claude is the gap between what you want it to connect to and what it actually can connect to today. Stainless, restructured as an internal Anthropic capability rather than a neutral platform, could close a lot of that gap quickly.
For agencies and commerce businesses building AI workflows: this matters. The connectivity layer is not a solved problem. Whoever solves it fastest — and who controls access to that solution — has significant leverage over how the agentic commerce and media ecosystem develops.
The Week in Context
This episode was deliberately light after a noisy week dominated by the Publicis/LiveRamp announcement. If you missed Episode 63, our breakdown with Ari Paparo (Marketecture) and Peter Bond (CPG Guys/Flywheel) — check it out! It’s 30 minutes of unfiltered analysis of that deal you’ll find anywhere.
Have a great Memorial Day weekend.
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