How do institutional buyers and government agencies do their buying?

I assume you mean "How do institutional buyers...do their buying [in the capital markets]". Like in buying securities, as opposed to institutional buyers, buying raw materials or something. Institutions is a pretty broad term. Once it meant mainly banks, insurance companies, and bigger pensions (smaller pensions used banks and insurance companies for investments). And, now mutual funds are one of the largest institutional buyers as well. both institutional buyers and govt agencies buy in both the primary and secondary markets... so they buy securities, directly from issuers and the issuers selling investment banks or primary brokers and they buy on the open markets (exchanges and broker/dealers) directly, through program trades, and dark pools. did you have some specific type of security or market in mind? hope that helps