Top 5 Promising AI Training / Human-in-the-Loop Companies (Global)
These are firms either directly in the human-data / annotation / AI training space, or enabling related infrastructure, that are particularly notable in 2025:
| Company | What They Do / Strength | Recent Highlights / Risks |
|---|---|---|
| Scale AI | One of the leading data-labeling / human-in-the-loop platforms. | Meta bought ~49% stake; handles huge volume of labeling work. (From the Business Insider list) |
| Surge AI | Connects expert humans to AI training tasks (annotation, rewriting, evaluation) | Claims ~$1.2B revenue, supports high hourly rates for specialized workers. |
| Mercor | Matches human trainers to AI tasks with screening & matching systems | Pays ~$95/hr average; aiming for high valuation. |
| Labelbox | Platform + marketplace for data labeling & training data management | Supports many annotation modalities (text, image, audio). |
| Snorkel AI | Focus on “data programming,” generating training data + human validation | Recently underwent layoffs (~13%) as it pivots business model. Business Insider |