13F shows the holdings of an asset manager as of a specific date
fmpc_13f_data(cik = "0001067983", date = "2019-12-31")
one or more valid ciks from fmpc_13f_cik_list
one or more quarter end dates (yyyy-03-31, yyyy-06-30, yyyy-09-30, yyyy-12-31)
13F holdings
if (FALSE) {
# Berkshire can be run using the demo
fmpc_set_token()
fmpc_13f_data('0001067983', '2020-03-31')
# Must set a valid API token
fmpc_set_token('FMPAPIKEY')
goldmanCik = fmpc_13f_cik_search('golman')
fmpc_13f_data(cik = goldmanCik$cik, date = c('2020-03-31','2020-06-30'))
}