Simonetti moved back to his native Argentina in 1985 and built the brand from polo's craft outward into shirts, caps and ready-to-wear, with 65% of materials sourced locally. He also founded the Polo Management Group to run international tournaments alongside the label. From sales of $1.2 million in 2000, the company grew toward $200 million over the decade, opening its first London store in 2015 with further stores across the Americas and Asia.
La Martina is the official supplier to the Argentine polo teams and to the Federation of International Polo, outfitting national teams from the UK to Brazil and university squads from Harvard and Yale to Oxford and Cambridge. Newsweek credited it with changing the sport of kings by giving players more protection and comfort.