Singapore, 4 November 2026 – Sharp share-price moves following analyst downgrades do not establish that retail investors can reliably profit by copying the recommendations, according to finance academic Roger Loh. In commentary published on 4 November, the Nanyang Technological University associate professor cited a 2011 study of more than 150,000 US recommendation changes in which only about one in eight coincided with a large price move in the same direction.
The distinction matters for Asian investors who often encounter a rating change after prices have already adjusted. Loh’s argument is not that analyst research lacks value, but that understanding a company differs from reacting to a headline trading signal. The historical US evidence provides context for that assessment; it does not prove that the same proportions apply to today’s Singapore market.
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