Geopolitical tensions and higher defense spending have fueled strong gains for the world’s largest defense and aerospace firms in 2025. The world’s five biggest players have increased their market cap since the end of 2024, led by GE Aerospace, which jumped 75.9% to $315 billion as of October 3, 2025. Here’s a look at the YTD performance of 5 largest defense and aerospace firms by market cap.
