In general, Republicans were much more likely to hold stocks than their Democrat counterparts, according to the report.
Among the top 80 companies in which lawmakers invested as of September, Republicans outnumbered Democrats in 78. Facebook and Honeywell were solely held by Democrats, respectively 10 and 12.
Republicans and Democrats did agree on life insurance provider Metlife and Vodafone, the British telecom giant. An equal number invested in these companies, 11 and 12, respectively.
Republicans and Democrats almost found common ground in Microsoft (29-28), Disney (19-18) and Intel (21-20).
MapLight's report is based the analysis of annual financial disclosures by the 435 members of the House and the 100 members of the Senate.
"Citizens need information on which stocks each member of Congress owns to help them decide if members of Congress are acting in the public interest, or their own self interest," said Daniel Newman, co-founder of MapLight.