This paper examines how interactions across competition spaces moderate a firm’s voluntary disclosure of research and development (R&D). A growing body of research in the accounting literature suggests that information about innovation can influence competitors in product and technological markets, sometimes in different ways. However, less is understood about the effect of this multidimensionality in competition on R&D disclosure decisions. To capture the interaction between competition in the product market and in technology, I identify the competition space a firm prioritizes in its disclosure decisions by comparing the degree of competition across both spaces. The results show that firms that prioritize technological competition are more likely to voluntarily disclose patent-related information when they face intense competition in either market. In contrast, when they emphasize product market competition, no significant association between competition and disclosure is observed. Overall, this paper contributes to the literature on competition and innovation disclosure by shedding light on how multiple competition spaces in which a firm operates influence its R&D disclosure decision through their interactions.