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a16z announced it is leading Probook’s Series A (a16z stated $34M); Probook…

Brief

Probook raised a Series A led by a16z (a16z reports $34M; George Eliadis announced $40M from Sequoia and a16z) for its dispatch-first AI OS. Founded by trades veterans (George Eliadis, cofounder Ben), Probook centralizes dispatch, intake, messaging and outbound into one text thread and reports major customer gains (2,542 jobs/month, +20% revenue per job, 10→22 techs/dispatcher).

Why it matters

a16z announced it is leading Probook’s Series A (a16z stated $34M); Probook founder George Eliadis separately announced $40M in funding from Sequoia and a16z (announcement posted 2026-06-23).

Key details

  • Probook built a dispatch-first AI operating system (dispatch → intake → data scrubbing → messaging → outbound) that keeps each customer on a single text thread from first call to technician arrival.
  • Customer claims: Summers Plumbing booked 2,542 jobs in its first month with zero human intervention; Anthony PHCE saw 20% more revenue per job on a 50% leaner team; Del-Air increased dispatcher coverage from 10 to 22 techs per dispatcher.
Source evidence

We're excited to lead Probook's $34M Series A.

Every home services business runs on dispatch: which technician goes to which job, in what order, at what time.

Almost every AI vendor building for the trades skipped dispatch, instead rushing to build voice agents and chat widgets.

@probookai built dispatch first, then expanded outward into intake, data scrubbing, messaging, and outbound. Every customer stays on one text thread from the first call to the technician at the door.

@georgeprobook grew up in the trades, pressure washing alongside his dad, and spent a summer inside a $40M HVAC shop before building the software to fix it.

Welcome, George, @probookcto, Ben, and the entire Probook team.

By @arampell, @dhaber, and @omooretweets

George Eliadis (@georgeprobook)

Announcing $40M in funding from @sequoia and @a16z.

I grew up pressure washing houses in upstate New York. Six summers in the truck, missing calls from the top of a ladder because I couldn't hear my phone ring. My co-founder Ben grew up plumbing with his dad in San Francisco.

We entered home services because we grew up in it. I spent a summer inside TR Miller, one of the best-run HVAC, plumbing and electrical shops in the country, and their workflows were still raw.

The first wave of AI in the trades was point solutions. One tool for voice, one for outbound, one for follow-up. Operators ended up with five vendors and more overhead.

Probook is the AI operating system that helps you add points to your EBITDA and run your entire customer experience as one connected system, built around dispatch.

Many of America’s largest home service brands run on Probook today. Summers Plumbing booked 2,542 jobs their first month with us, zero human intervention. Anthony PHCE ran 20% more revenue per job on a 50% leaner team. Del-Air more than doubled productivity from 10 to 22 techs per dispatcher.

To everyone who trusted us early: thank you.

Back to work. We're hiring.

— https://nitter.net/georgeprobook/status/2069411496354840680#m