The current institutional shareholding score of Tenaris SA is 3.00, ranking 66 out of 100 in the Oil & Gas Related Equipment and Services industry. The latest institutional shareholding proportion is 6.91%, representing a quarter-over-quarter decrease of 3.29%. The largest institutional shareholder is James Simons, holding a total of 0.00 shares, representing 0.63% of shares outstanding, with 0.60% decrease in holdings.