Purpose This study scrutinizes the convergence between commercial advertising and the political vision of social movement in media advertisements. This study deliberates how commercial advertisement could be compatible with movement discourses and social resistance. Such hybridization between commercial narration and movement discourses is different from political advertising sponsored by political and civic organizations. This study uses an advertising campaign in Hong Kong which expressed outcry against police search on an outspoken media as a case study to conceptualize advertising activism with the thematic analysis of the movement discourses shown in printed advertisements. This study aims to engage with scholarly dialogue surrounding social movement studies and discuss how movement discourses could hybridize with commercial advertisement. Design/methodology/approach This study examines the discourses and textual features of an advertising campaign initiated by the public instead of political elites and social movement organizations in Hong Kong, in which various individual citizens, anonymous participants, business enterprises and civic organizations expressed their anger over a police search against an outspoken media (Apple Daily) by Hong Kong police. This bottom-up advertising campaign shows how the narration of commercial advertising could be hybridized with the activism for social resistance, which is conceptualized as advertising activism in this paper. Findings Based on the textual features and discourses embedded in the advertisements, this study investigates the printed advertisements mushroomed in Apple Daily since the police search in August 2020 by the thematic analysis under the concept of advertising activism: frame construction, identities mobilization and decentered solidarity. Advertising activism differs from commercial and political advertising from two ways. Firstly, its advertisements are cosponsored by numerous nonpolitically well-known individuals or organizations. Secondly, advertising activism feature with hybridization between commercial narration and political or movement discourses. Discourses of advertising activism aim to mobilize the commercial identity of consumers for noncommercial means by their consumption behaviors. Originality/value The findings illustrate a hybridization of commercial narration and movement discourses stemming from social movement and identity politics, which is coined by our conceptualization of advertising activism. While commercial and political advertising focus on business promotion and political messages, respectively, advertising activism demonstrates multiple layers of cultural meanings on the consumption behaviors which hybridize with political and movement discourses. The authors hope this study could unleash further intellectual dialogue on the social role of advertising in social movement and how movement discourses “spillover” from social events to the commercial advertisement.