Table of Contents Reference Number per Item 601 of Regulation S- K Description of Exhibits Exhibit Number in this Form 10-K Amendment No. 4 to the IBM Excess 401(k) Plus Plan, a compensatory plan, dated as of February 25, 2014, which was filed as Exhibit 10.1 to Form 10-Q for the quarter ended March 31, 2014, and is hereby incorporated by reference.* Amendment No. 5 to the IBM Excess 401(k) Plus Plan, a compensatory plan, dated as of December 9, 2014, which was filed as Exhibit 10.2 to Form 10-K for the year ended December 31, 2014, and is hereby incorporated by reference.* Amendment No. 6 to the IBM Excess 401(k) Plus Plan, a compensatory plan, dated as of December 18, 2015, which was filed as Exhibit 10.1 to Form 10-K for the year ended December 31, 2015, and is hereby incorporated by reference.* Amendment No. 7 to the IBM Excess 401(k) Plus Plan, a compensatory plan, dated as of June 30, 2016, which was filed as Exhibit 10.2 to Form 10-Q for the quarter ended June 30, 2016, and is hereby incorporated by reference.* Amendment No. 8 to the IBM Excess 401(k) Plus Plan, a compensatory plan, dated as of December 31, 2017, which was filed as Exhibit 10.2 to Form 10-K for the year ended December 31, 2017, is hereby incorporated by reference.* Amendment No. 9 to the IBM Excess 401(k) Plus Plan, a compensatory plan, dated as of December 18, 2018, which was filed as Exhibit 10.1 to Form 10-K for the year ended December 31, 2018, is hereby incorporated by reference.* The IBM 2003 Employees Stock Purchase Plan, contained in Registration Statement 333-104806 on Form S-8, as amended through April 1, 2005, which was filed as Exhibit 10.3 to Form 10-Q for the quarter ended March 31, 2005, is hereby incorporated by reference.* Form of Noncompetition Agreement, filed as Exhibit 10.2 to Form 10-Q for the quarter ended March 31, 2009, is hereby incorporated by reference.* Form of Noncompetition Agreement, filed as Exhibit 10.1 to Form 10-Q for the quarter ended March 31, 2012, is hereby incorporated by reference.* Form of Noncompetition Agreement, filed as Exhibit 10.2 to Form 10-K for the year ended December 31, 2015, is hereby incorporated by reference.* Form of Noncompetition Agreement, filed as Exhibit 10.3 to Form 10-Q for the quarter ended June 30, 2016, is hereby incorporated by reference.* Form of Noncompetition Agreement, filed as Exhibit 10.1 to Form 10-K for the year ended December 31, 2016, is hereby incorporated by reference.* Form of Noncompetition Agreement, filed as Exhibit 10.3 to Form 10-K for the year ended December 31, 2017, is hereby incorporated by reference.* Form of Noncompetition Agreement, filed as Exhibit 10.2 to Form 10-Q for the quarter ended September 30, 2018, is hereby incorporated by reference.* Form of Noncompetition Agreement* 10.2 Letter Agreement, signed by Erich Clementi and IBM, effective as of April 30, 2019, filed as Exhibit 10.1 to Form 10-Q for the quarter ended March 31, 2019, is hereby incorporated by reference. 27