Siuchoon Koay

Research Analyst

Siuchoon Koay is a research analyst on the global equity team at William Blair Investment Management. He covers large-cap global semiconductors. Before joining the firm in 2025, Siuchoon was a senior analyst covering semiconductors at Newton Investment Management in London. Previously, he was senior analyst covering global technology at Atherton Asset Management in Hong Kong. Before that, Siuchoon was a senior research associate covering Asian hardware at Sanford C. Bernstein in Hong Kong. He received a B.S. in electrical engineering and computer science and economics from MIT.

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