AfterQuery (YC W25) — Applied research lab curating data solutions for foundation model…
AfterQuery is an applied research lab curating data solutions for frontier foundation model development. Serving every frontier AI lab.
AfterQuery is a Y Combinator company in the Winter 2025 batch. Its directory entry describes it as: Applied research lab curating data solutions for foundation model…. The founders listed are Spencer Mateega (Founder/CEO), Carlos Georgescu (Founder/CTO) (Y Combinator directory entry, January 30, 2025).
Get an email when AfterQuery changes status, grows its team or files a funding notice. One email first to confirm; nothing else until you click it. At most one a day, one click to stop. Free for up to 3 companies.
Example from a real report (our sample on Target): “In March 2026, Target announced a planned incremental $1 billion operating investment” Source: Target Corporation (press release)
AfterQuery captures how experts reason and turns real-world professional work into high-quality training data for frontier foundation models.
The title and description the site itself served, answering 200. Not a cached copy and not the company's directory entry — what was live when we asked.
Spencer Mateega
Founder/CEO
Building AfterQuery. Previously interned in technology private equity at Silver Lake, technology investment banking at Morgan Stanley, and software engineering at Meta and Google.
B.S. in Finance and Statistics at Wharton and a M.S. Computer Science at Penn.
Carlos Georgescu
Founder/CTO
Building AfterQuery. Previously interned at Citadel Securities (2x), Meta & Google as a software engineer. Past acquired ed-tech founder.
Studied for a B.S. in Computer Science from the University of British Columbia.
Founders, titles and bios as the company published them. Photographs are our own copies of the ones on that record, so they do not break when the original link expires.
One of 338 companies held here in B2B › Infrastructure.
No investor is drawn from a Form D — the form states how many invested and never who. The one investor on this graph is named because a batch has exactly one.
Want the whole picture on AfterQuery?
Example from a real report (our sample on Target): “In March 2026, Target announced a planned incremental $1 billion operating investment” Source: Target Corporation (press release)
A Full Report on AfterQuery: verified, sourced, every claim cited, ready in a few minutes. See pricing.
What the Full Report on AfterQuery covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
9 cited sources found
Plus the sections for what you are deciding, which you pick after ordering.
You get an alert in MentionFox the next time this company shows up.
Is this you?
If you're behind AfterQuery: acceptance into a YC batch is one of the few weeks a young company gets looked up by people who matter — investors, other founders, press. FoxPlug turns the commits, deploys, and releases you're already making into that story automatically, so anyone who looks finds something current. GetFoxChat puts a guide on your own site so the people YC's own page just sent you don't read one line and leave.
AfterQuery (YC W25) — Applied research lab curating data solutions for foundation model…. MentionFox, 2026-10-20. https://mentionfox.com/funding/yc-afterquery
