There is a number in the Saudi telecommunications market that deserves more analytical attention than it typically receives. It is not a revenue figure or a dividend yield. It is the distance between two companies measured in percentage points of mobile market share, and what that distance implies about the structural economics of competing in one of the Gulf's most consequential infrastructure markets.

As of Q1 2025, STC holds approximately 44 percent of the Saudi mobile market and over 70 percent of fixed-line broadband, underscoring its incumbent status in the Kingdom's telecom landscape.

Set against that,

Mobily commands roughly 28 percent of mobile market share, with a strategic focus on 5G quality and customer loyalty.

The Mobily STC market share gap, in other words, sits at somewhere between 16 and 20 percentage points depending on the metric and the methodology, and it has proved remarkably durable. Understanding why it has proved durable, and what both companies are doing about it, is the more interesting question.