X0508 4 2024-08-21 0 0000701288 ATRION CORP ATRI 0001085535 STUPP JOHN P JR STUPP JOHN P JR #18 ST. ANDREWS DR. ST LOUIS MO 63124 1 0 0 0 0 common stock 2024-08-21 4 D 0 6394 460 D 0 D common stock 2024-08-21 4 D 0 8932 460 D 0 I By Family Trust common stock 2024-08-21 4 D 0 135000 460 D 0 I By Stupp Bros, Inc. Deferred Stock Unit 0 2024-08-21 4 D 0 879.12 460 D common stock 879.12 0 D Disposed of as a result of the merger pursuant to the previously announced Agreement and Plan of Merger, dated as of May 28, 2024, by and among Nordson Corporation, Alpha Medical Merger Sub, Inc., a wholly owned subsidiary of Nordson, and Atrion Corporation. At the effective time of the Merger, (i) each issued and outstanding share of common stock and (ii) each restricted stock unit, performance-based stock unit and deferred stock unit, were thereupon canceled and converted into the right to receive $460.00 in cash. The Reporting Person no longer has a reportable beneficial interest in 13,398 shares of Atrion common stock owned by his children and included in the Reporting Person's prior ownership reports. /s/Cindy Ferguson, Attorney-in-fact 2024-08-21