But you can do an "advanced search" by registered company name, and this is what comes up for "Microsoft" -- probably doesn't include all of its subsidiaries that don't have "Microsoft" in the name: ~$1.4 billion in awarded contracts
https://www.usaspending.gov/Pages/AdvancedSearch.aspx?sub=y&...
edit: Oh I know the reason for the discrepancy...the homepage of the beta app says it's only partial data:
> Added more years of contract data to now include 2011 - 2015
1. Agencies often buy from distributors and integrators, not publishers. In this case, original manufacturers may appear in the variable `descriptionofcontractrequirement`.
2. Spelling may differ. Variable `dunsnumber` is be a better indicator for uniqueness.
A search on sam.gov for "lockheed" results in 207 records (all probably the same company).