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Littelfuse Expertise Applied Answers Delivered NEWS RELEASE LITTELFUSE REPORTS FIRST QUARTER RESULTS FOR 2021 Record sales driven by strong worldwide execution NEWS Littelfuse Inc 8755 West Higgins Road , Suite 500 Chicago , Illinois 60 60631 p : ( 773 ) 628-1000 f : ( 773 ) 628-0802 www.littelfuse.com Exhibit 99.1 CHICAGO , April 28 , 2021 - Littelfuse , Inc. ( NASDAQ : LFUS ) , an industrial technology manufacturing company empowering a sustainable , connected , and safer world , today reported financial results for the first quarter ended March 27 , 2021 : Net sales of $ 463.8 million were up 34 % versus the prior year period , and up 26 % organically , due to strong demand across number of electronics , automotive and industrial end markets Growth by segment versus the prior year period : • • о Electronics sales grew 34 % ( up 32 % organically ) ° Automotive sales grew 23 % ( up 17 % organically ) Industrial sales grew 80 % ( up 10 % organically ) GAAP diluted EPS was $ 2.32 ; adjusted diluted EPS was $ 2.67 , a growth of 107 % and includes $ 0.54 of benefits related to a non - operating mark - to - market gain and lower effective tax rate compared to the prior year period GAAP effective tax rate was 20.6 % and the adjusted effective tax rate was 19.2 % Cash flow from operations was $ 50.2 million and free cash flow was $ 35.4 million " We are off to a strong start this year , delivering double - digit revenue and EPS growth well ahead of expectations , " said Dave Heinzmann , Littelfuse President and Chief Executive Officer . " Our agile teams around the world continue to navigate through this dynamic market environment while meeting commitments to our customers . Looking ahead , we are seeing healthy demand across a number of our end markets aligned to the strategic , structural growth themes of a sustainable , connected , and safer world . We remain confident we are well - positioned for long - term profitable growth . " Second Quarter of 2021 * For the second quarter , the company expects net sales in the range of $ 463 to $ 477 million , adjusted diluted EPS in the range of $ 2.12 to $ 2.28 and an adjusted effective tax rate of approximately 17 % . -more-