The disclosure was made after BlackRock’s holding - acquired on and off the market - rose above the 5 percent threshold at which such disclosures are mandatory.
On behalf of clients and funds under management, BlackRock now has a 5.002 percent stake in SocGen and 4.48 percent of voting rights in the group, according to the AMF filing.
A BlackRock spokesman in London said the asset manager did not comment on individual company holdings.
Reporting by Christian Plumb and Benjamin Mallet. Editing by Jane Merriman