US Aerospace Defense Stocks Surge by 1.4 Trillion Won in a Day

York Space Systems Inc. (YSS), a small-satellite manufacturer, saw its share price surge 18.77% on May 26 to close at $34.48, reclaiming its $34 IPO price. Its market capitalization swelled to approximately $4.47 billion (about ₩6.2 trillion), with a one-day increase of roughly $1.03 billion (₩1.4 trillion).

In its first-quarter 2026 earnings report, the company posted revenue of $116.34 million (about ₩160 billion), up 9.5% year-over-year, but continued to incur a net loss of $175.76 million (around ₩240 billion). At the same time, York Space Systems announced a deal to acquire satellite terminal provider AllSpace for about $355 million (₩490 billion), following its earlier purchase of electric-propulsion specialist Orbion Space Technology—moves that accelerate its vertical integration from satellite platforms to end-user terminals.

Headquartered in Denver, Colorado, York Space Systems is regarded as a key partner supplying low-Earth-orbit satellites for the U.S. Department of Defense’s Space Development Agency “Proliferated Warfighter Space Architecture” and the Pentagon’s “Golden Dome” missile-defense project. In its January IPO on the New York Stock Exchange, the company raised $629 million (approximately ₩870 billion) via an offering of about 1.805 billion shares. Leveraging standardized, low-cost satellite buses to serve both government and commercial customers, York Space Systems has emerged as a standout “space defense” stock.