The Short Version
The evidence does not firmly support a 20% market share for the stated early-2025 or early-2026 period. Yuanta appears to have been a leading margin lender, and older or self-published materials point to a historical share near one-fifth, but those sources are not time-specific. The more contemporaneous numbers cited are either venue-specific or likely based on a different metric, so the claim’s exact figure and timeframe are not established.