Group 1: Aerospace Sector - The aerospace sector's valuation has risen above historical levels, with a current NTM EV/EBITDA trading at approximately 18 times, up from about 16 times at the beginning of the year, outperforming the S&P 500 index by a median premium of about 15% [2][3] - Strong air traffic has been a key driver for this valuation increase, highlighted by record passenger screenings by the TSA [2] - Despite some initial concerns regarding supply chain challenges and tariffs, the sector's valuation quickly rebounded as negative impacts did not materialize [2] Group 2: Defense Sector - The valuation multiples for major U.S. defense contractors have improved, with the current NTM P/E median at about 20 times, up from approximately 17 times at the beginning of 2025 [4] - The expansion in valuation multiples is partly due to alleviated concerns over potential defense spending cuts, as these cuts have not occurred [4] - Key government funding initiatives, including approximately $24 billion for the Iron Dome and $150 billion for overall defense, have provided support for the sector [4] Group 3: Space Sector - The space sector has experienced significant volatility, with the NTM EV/Sales median peaking above 10 times in September before dropping to about 4 times in November, and currently recovering to around 6 times [6] - Major IPOs in the sector, such as Voyager and Firefly, initially saw rapid market capitalization growth but have since declined below their issue prices due to investor caution [6] - Companies like Rocket Lab and Planet Labs are highlighted as strong performers, trading at approximately 35 times and 11 times NTM EV/EBITDA, respectively, supported by operational success and a new business model focus [6][7]