# How MarketAxess uses H2O.ai

**24,000** Corporate bonds scored in real time

As published on [h2o.ai](https://h2o.ai/case-studies/marketaxess-h2o). Captured by usedby on 2026-10-29.

- Company: [MarketAxess](https://www.usedby.ai/companies/marketaxess.md)
- Tool: [H2O.ai](https://www.usedby.ai/tools/h2o-ai.md)
- Industry: [Investment & VC](https://www.usedby.ai/companies/industry/investment-vc.md)

## The use case: how MarketAxess deploys H2O.ai

MarketAxess built Composite+, a proprietary algorithmic bond pricing engine powered by H2O Driverless AI and H2O-3, which uses machine learning to score corporate bonds continuously and refresh prices on a regular cadence. The pricing feeds into its electronic trading platforms and tools used by traders.

Summary written by usedby from the source page, in English. The figures are those of H2O.ai and MarketAxess, not ours.

> Composite+ scores 24,000 corporate bonds in real time across global markets and reprices them every 15 seconds. Machine learning reduced model scoring errors by an average of $0.66 per bond, sharpening the accuracy traders rely on.

- **15 seconds**: “Composite+ scores 24,000 corporate bonds in real time across global markets and reprices them every 15 seconds.”

> H2O is an integral part of the Composite+ pricing engine and provides fundamental machine learning that makes our algorithms run better, with more accurate and timely pricing for our clients.
>
> David Krein, Global Head of Research at MarketAxess

Source: [h2o.ai](https://h2o.ai/case-studies/marketaxess-h2o), captured 2026-10-29.

## Other companies using H2O.ai

- [ADP](https://www.usedby.ai/companies/adp.md) — Confirmed
- [AES](https://www.usedby.ai/companies/aes.md) — Confirmed
- [AT&T](https://www.usedby.ai/companies/att.md) — Confirmed
- [Acordo Certo](https://www.usedby.ai/companies/acordo-certo.md) — Confirmed
- [Airvantage](https://www.usedby.ai/companies/airvantage.md) — Confirmed
- [ArmadaHealth](https://www.usedby.ai/companies/armadahealth.md) — Confirmed

## What usedby checked

We compared the story with its live page on 2026-10-29.

- Checked: the figure 24,000 is on the page; its label is our wording.
- Checked: the passage quoted above is copied word for word from the page, near the name of MarketAxess.
- Checked: each number in our summary is printed on the page.
- Checked: MarketAxess uses H2O.ai. Confirmed line. Latest check across sources: 2026-11-04.
- Not checked: the result itself. We quote it; we did not measure it.

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Source: https://www.usedby.ai/case-studies/marketaxess-h2o-ai · How we check: https://www.usedby.ai/methodology