Exhibit 99.1 (inmillions,exceptpershareamounts)ForImmediateReleaseAspenAerogels,Inc.ReportsSecondQuarter2024FinancialResultsandRecentBusinessHighlightsRecordquarterlyrevenuesof117.8 million, up 25% QoQ and 145% YoY Delivered 16.8millionofquarterlynetincomeand28.9 million of quarterly Adjusted EBITDA Increased 2024 revenue and profitability outlook for the second consecutive quarter NORTHBOROUGH, Mass., August 7, 2024 — Aspen Aerogels, Inc. (NYSE: ASPN) ("Aspen" or the " ...