This article reflects on #OneDOST4U, a unifying communication handle adopted by the Republic of the Philippines’ Department of Science and Technology (DOST) across multiple media vehicles. The campaign sought to strengthen a single institutional identity while inviting participation and feedback from diverse audiences, such as researchers, educators, local governments, industry partners, and communities. Through focus group discussions with stakeholders from 11 agency projects, we explored how publics interpreted and engaged with the campaign. Using qualitative thematic analysis, we identified recurring themes of value-in-use, dialogic engagement, and communal identity. Findings illustrate how institutional branding tools operate as boundary objects: recognisable symbols that different groups interpret in context while contributing to a shared sense of meaning. For science communication practice, #OneDOST4Udemonstrates that unifying institutional campaigns are most effective when treated as participatory boundary objects—tools that allow diverse stakeholders to negotiate meaning, build trust, and co-create the public value of science.