This　article　examines　the　influence　of　institutional　ownership　industry　coverage　(IOIC)　on　corporate　trade　credit.　The　results　show　that　IOIC　significantly　promotes　corporate　trade　credit　and　remains　valid　after　multiple　robustness　tests.　The　study　identifies　two　primary　mechanisms　through　which　IOIC　increases　corporate　trade　credit:　the　supervisory　governance　effect　and　the　risk　mitigation　effect.　IOIC＇s　trade　credit　promotion　is　more　pronounced　for　firms　with　lower　disclosure　quality,　poorer　supply　chain　operating　environment,　and　stronger　institutional　cross-industry　expertise.　These　findings　provide　valuable　insights　into　the　effects　of　institutional　multi-industry　holdings　and　offer　a　useful　reference　for　optimizing　supply　chain　credit　allocation.