The current institutional shareholding score of Merck & Co Inc is 7.00, ranking 50 out of 155 in the Pharmaceuticals industry. The latest institutional shareholding proportion is 81.41%, representing a quarter-over-quarter increase of 1.44%. The largest institutional shareholder is ETHSX, holding a total of 19.05M shares, representing 0.77% of shares outstanding, with 1213.99% increase in holdings.