North America dominates the selexipag market with a 40% share, driven by advanced healthcare infrastructure, high adoption of innovative therapies, and robust R&D investments. The region benefits from a mature ecosystem for rare disease treatments, supported by favorable reimbursement policies and strong pharmaceutical industry partnerships. Meanwhile, Europe holds a 30% share, bolstered by stringent regulatory frameworks ensuring drug quality, growing awareness among HCPs, and public-private collaborations accelerating patient access. Asia Pacific is the fastest-growing region, with a projected CAGR of 12%, fueled by expanding healthcare coverage, rising prevalence of pulmonary hypertension, and increased affordability of biosimilars. Latin America and Middle East & Africa account for smaller shares (5% each) but show potential due to emerging market dynamics and improving healthcare access.