SCHEDULE 13G/A 0001199501 XXXXXXXX LIVE 2 Common Stock, $0.01 Par Value 03/31/2025 0000849869 Silgan Holdings Inc. 827048109 4 Landmark Square Suite 400 Stamford CT 06901 Rule 13d-1(d) D. Greg Horrigan X1 61447.00 6981856.00 61447.00 6981856.00 7043303.00 N 6.6 IN Silgan Holdings Inc. 4 Landmark Square, Suite 400, Stamford, CT, 06901 D. Greg Horrigan The business address of D. Greg Horrigan is c/o Silgan Holdings Inc., 4 Landmark Square, Suite 400, Stamford, Connecticut 06901. United States Y As of March 31, 2025, Mr. Horrigan may be deemed to be the beneficial owner of 7,043,303 shares of Common Stock. This amount consists of: (i) 26,813 shares of Common Stock owned directly by Mr. Horrigan over which he has sole voting and dispositive power; (ii) 34,634 shares of Common Stock owned by a family trust of which Mr. Horrigan is the trustee with sole voting and dispositive power; (iii) 5,738,272 shares of Common Stock owned by a community property trust of which Mr. Horrigan and his spouse are co-trustees and may be deemed to have shared voting and dispositive power; (iv) 1,233,584 shares of Common Stock owned by the Horrigan Family Limited Partnership of which Mr. Horrigan's spouse is the sole general partner with sole voting and dispositive power and over which Mr. Horrigan may be deemed to have shared voting and dispositive power; and (v) 10,000 shares of Common Stock owned by a family foundation of which Mr. Horrigan and his spouse are co-trustees and may be deemed to have shared voting and dispositive power but with no pecuniary interest therein. According to the Issuer's most recent Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 8, 2025, the number of shares outstanding of the Issuer's Common Stock as of April 30, 2025 was 106,993,180. As a percentage of such total number of shares of Common Stock outstanding, the shares of Common Stock which Mr. Horrigan may be deemed to beneficially own as of March 31, 2025 constitute approximately 6.6% 61,447 6,981,856 61,447 6,981,856 Y N N Not Applicable N Not Applicable N Not Applicable N Not Applicable Y D. Greg Horrigan /s/ D. Greg Horrigan 05/09/2025