What does the first-level organization mean in bank recruitment?

Taking Bank of China as an example, "tier-one institutions" refer to six directly affiliated institutions of the Head Office, such as the Head Office Department and Bank Card Center, 365,438+0 audited branches such as Beijing Branch, 36 domestic tier-one branches and other directly affiliated branches such as Beijing Branch and Hebei Xiong 'an Branch, four Hong Kong, Macao and Taiwan institutions such as BOC Hong Kong, and 65,438+065,438+0 comprehensive operating companies and minority language training programs such as BOC Fund.