Which are the largest medical AI data companies?

By the money on record: Mercor, $2B (run rate, Jun 2026); Surge AI, $1.2B (FY2024); micro1, $1B (run rate, Oct 2026). 11 of the 56 on the list have revenue on record; the others are ranked on their valuation or the money they raised.

Is Scale AI the biggest of the medical AI data companies?

By valuation, yes: Scale AI was valued at $29B (Jun 2025). By revenue on record, Mercor is larger: $2B (run rate, Jun 2026), against $870M (FY2024) for Scale AI.

Which medical AI data companies buy data from companies?

13 of them take data from companies that hold it, on a published programme or in their own words: Mercor, micro1, Scale AI, Turing, Appen, AfterQuery, Labelbox, Kled, Defined.ai and Centific, and others in the table. A company holding such data can value it free and be introduced to every one whose rules take it.

How many medical AI data companies are there?

56 companies on our register say on their own pages that they work on medical. 26 of them have revenue, a valuation or funding on record, and are ranked; the rest are listed by name.

Updated 8 Nov 2026

Medical AI training data companies in 2026, ranked by revenue.

Name: Medical AI training data companies, ranked by revenue, valuation and funding
Creator: AIData.Broker

The largest medical AI data companies by revenue on record are Mercor ($2B, run rate, Jun 2026), Surge AI ($1.2B, FY2024), micro1 ($1B, run rate, Oct 2026), Scale AI ($870M, FY2024) and Prolific ($500M, run rate, May 2026). They supply clinical records, medical images and the judgments of doctors and nurses for health AI.

56 companies on our register say on their own pages that they work on medical. 26 have revenue, a valuation or funding on record and are ranked below, every figure linked to the filing or article it comes from. Also called healthcare AI data providers, clinical data vendors for AI.

Hold data these companies buy? AIData.Broker values it free and introduces it to every buyer that takes it, at no cost to you: the buyers pay us. Where it earns more, we run the sale ourselves, for a fee only out of a sale.

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medical AI data companies on the list

with revenue on record

$6.8B

a year between them, on record

take data from companies

The largest medical AI data companies by revenue

The 10 with the most revenue on record, each bar linked to the record it comes from.

1Mercor$2B
2Surge AI$1.2B
3micro1$1B
4Scale AI$870M
5Prolific$500M
6Innodata$350M
7Turing$300M
8TaskUs$250M
9Appen$249M
10AfterQuery$100M

Revenue over twelve months as each company published it or was reported to earn it; the periods differ, and the table below gives each one.

The latest money moves

The newest rounds, valuations and revenue figures among these companies, each linked to its record.

5 Nov 2026Innodata reported $350M revenue (12 months to Sep 2026)
4 Nov 2026TaskUs reported $250M revenue (12 months to Sep 2026, AI Services)
22 Oct 2026BioStack Platforms raised $9.5M
14 Oct 2026Labelbox raised $100M at a $1.3B valuation
12 Oct 2026micro1 was valued at $4B valuation
12 Oct 2026micro1 reported $1B revenue (run rate, Oct 2026)

Best for each kind of work

For each thing they sell, the highest-ranked company on this list that names it on its own pages: the largest by the money on record, and how many here do the same work.

Best for evaluations and benchmarksMercor, $2B (run rate, Jun 2026): the largest of the 24 here that sell evaluations and benchmarks.
Best for datasetsMercor, $2B (run rate, Jun 2026): the largest of the 23 here that sell datasets.
Best for expert and human dataMercor, $2B (run rate, Jun 2026): the largest of the 21 here that sell expert and human data.
Best for RL environmentsMercor, $2B (run rate, Jun 2026): the largest of the 13 here that sell RL environments.
Best for annotationScale AI, $870M (FY2024): the largest of the 17 here that sell annotation.
Best for labeling softwareScale AI, $870M (FY2024): the largest of the 8 here that sell labeling software.

The ranking: 26 medical AI data companies

Each company is ranked on the first of these it has on record: its revenue over twelve months (a run rate or a year as published, or its last four quarters added up; an AI segment where the rest of its business is not AI data), then its newest valuation, then the money it disclosed raising. No company pays for a place.

How it is made

Medical AI training data companies, ranked by revenue, valuation and funding on record
#	Company	Ranked on	Measure	Valuation	Sells	Pays companies for data
1	Mercor	$2B	Revenue, run rate, Jun 2026	$10B	RL environments, Datasets, Expert and human data, Evaluations and benchmarks	Through our introductions
2	Surge AI	$1.2B	Revenue, FY2024		RL environments, Datasets, Expert and human data, Evaluations and benchmarks
3	micro1	$1B	Revenue, run rate, Oct 2026	$4B	RL environments, Evaluations and benchmarks, Expert and human data, Datasets	Through our introductions
4	Scale AI	$870M	Revenue, FY2024	$29B	Labeling software, RL environments, Datasets, Expert and human data, Evaluations and benchmarks, Annotation, Simulation	Through our introductions
5	Prolific	$500M	Revenue, run rate, May 2026		Evaluations and benchmarks, Expert and human data, Datasets, Annotation
6	Innodata	$350M	Revenue, 12 months to Sep 2026		Labeling software, RL environments, Datasets, Expert and human data, Evaluations and benchmarks, Annotation
7	Turing	$300M	Revenue, run rate, Mar 2025	$2.2B	RL environments, Datasets, Expert and human data, Evaluations and benchmarks	Through our introductions
8	TaskUs	$250M	Revenue, 12 months to Sep 2026 (AI Services)		Annotation, Expert and human data, Datasets
9	Appen	$249M	Revenue, 12 months to Jun 2026		Labeling software, Datasets, Expert and human data, RL environments, Evaluations and benchmarks, Annotation	Its own programme
10	AfterQuery	$100M	Revenue, run rate, Apr 2026	$3.2B	RL environments, Datasets, Expert and human data, Evaluations and benchmarks	Through our introductions
11	Toloka	$26.4M	Revenue, FY2024		RL environments, Datasets, Expert and human data, Evaluations and benchmarks, Annotation
12	Labelbox	$1.3B	Valuation, 2026		RL environments, Expert and human data, Evaluations and benchmarks	Its own programme
13	Vals AI	$400M	Valuation, 2026		Evaluations and benchmarks, Datasets
14	Kled	$100M	Valuation, 2025		Datasets, Expert and human data, Evaluations and benchmarks, Annotation	Its own programme
15	Encord	$90M	Money raised, disclosed		Labeling software, Annotation, Expert and human data, Datasets, Evaluations and benchmarks
16	CloudFactory	$65M	Money raised, disclosed		Datasets, Annotation, Expert and human data, Evaluations and benchmarks
17	Defined.ai	$62.3M	Money raised, disclosed		Datasets, Expert and human data, Annotation, Evaluations and benchmarks	Its own programme
18	Centific	$60M	Money raised, disclosed		RL environments, Datasets, Expert and human data, Evaluations and benchmarks, Annotation	Its own programme
19	SuperAnnotate	$49.5M	Money raised, disclosed		Labeling software, Expert and human data, RL environments, Evaluations and benchmarks, Annotation, Datasets	Its own programme
20	Kili Technology	$32M	Money raised, disclosed		Labeling software, Annotation, Expert and human data, Evaluations and benchmarks
21	HumanSignal	$25M	Money raised, disclosed		Labeling software, Annotation, Evaluations and benchmarks
22	iMerit	$23.5M	Money raised, disclosed		Labeling software, Expert and human data, Evaluations and benchmarks, Annotation, Datasets
23	BioStack Platforms	$9.5M	Money raised, disclosed		RL environments, Datasets, Evaluations and benchmarks, Simulation
24	Perle AI	$9M	Money raised, disclosed		Datasets, Expert and human data, Evaluations and benchmarks, Annotation
25	Latch	$5M	Money raised, disclosed		Evaluations and benchmarks, Datasets, Annotation
26	Gradient Health	$2.8M	Money raised, disclosed		Datasets	Says it buys data

On the list with no money on record (30)

Twelve months.: A run rate or ARR is the company's own annualised figure, often its best month times twelve; a year is the year it published. Where a company reports quarters or halves, the last four quarters or two halves are added up. Gross revenue of a human data company includes what it pays its experts.
Who is on it.: A company is on this list when its own pages say it does this work, read word for word. It is not on it because we chose it, and none pays to be here.
Your place, on your site.: Every ranked company has a badge of its place, kept current with this page: the address is /badges/medical-ai-data-companies/ followed by the company's id in its page's address, as in Mercor's. Link it to this page.
Pays companies for data.: "Through our introductions": it takes companies' data through AIData.Broker's introductions and pays us a referral fee when one goes ahead. That never moves its place: the order is the money on record. "Its own programme": a published programme for buying data. "Says it buys data": its own words, linked.

Head to head

The comparisons people search between companies on this list, side by side on the same figures.

Every comparison

Other rankings

The same rule, other parts of the market, and every company on one page: the market map.

Every ranking

Best AI data labs and human data companiesLargest: Mercor
RL environment companiesLargest: Mercor
Best data labeling companiesLargest: Handshake AI
Best data labeling platformsLargest: Scale AI
AI evaluation companiesLargest: Mercor
Best AI training data providersLargest: Mercor
Coding data companies for AILargest: Mercor
Robotics training data companiesLargest: Scale AI
Speech and audio training data companiesLargest: Surge AI
Video and image training data companiesLargest: Surge AI
Finance AI training data companiesLargest: Mercor
Legal AI training data companiesLargest: Mercor
AI red teaming and security data companiesLargest: Proximal
Multilingual training data providersLargest: Surge AI
Synthetic training data companiesLargest: Mercor
Best AI data collection companiesLargest: Innodata
Computer-use agent data companiesLargest: Scale AI

Cite this

AIData.Broker, “Medical AI training data companies in 2026, ranked by revenue”, reviewed 8 Nov 2026. https://aidata.broker/best/medical-ai-data-companies

Free to reuse under CC BY 4.0 if you credit AIData.Broker and link to this page. Each row names the publication that stated it, and words quoted from a source keep that source's own terms.

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