Fox Run Management Boosts Tenaris Stake by 48% in Q4 Fox Run Management L.L.C. significantly increased its investment in Tenaris S.A. during the fourth quarter, acquiring an additional 7,210 shares, representing a 48.2% rise in holdings. This brings their total to 22,155 shares valued at $837,000. The move reflects growing confidence among institutional investors in the industrial products company.12