Component of the NF-Y/HAP transcription factor complex. Heterotrimeric transcription factor composed of three components, NF-YA, NF-YB and NF-YC. NF-YB and NF-YC must interact and dimerize for NF-YA association and DNA binding (By similarity). Interacts with NFYC2, NFYC4 and NFYC6 (PubMed:26542958). Belongs to the NFYB/HAP3 subunit family.