TLDR:
“Under the radar” refers to a company or strategy that operates quietly and without public attention, building its product, market position, or fundraising without disclosing plans to competitors or the press.
Under the Radar as Strategy
Operating under the radar is a deliberate competitive strategy in certain market contexts. Startups in industries where incumbents are known to aggressively respond to competitive threats — through legal challenges, pricing warfare, or talent acquisition — sometimes benefit from avoiding public attention that would alert incumbents to act. This is particularly relevant in regulated industries where a startup’s novel approach to compliance might be challenged if prominently publicized before sufficient customer base and legal precedent are established.