Exhibit 4.28 THIRD AMENDED AND RESTATED JANUARY 1999 STOCKHOLDERS' AGREEMENT This Third Amended and Restated January 1999 Stockholders' Agreement (this "Agreement") is entered into as of March 10, 2000, by and among McLeodUSA Incorporated, a Delaware...Stockholders' Agreement • May 15th, 2000 • McLeodusa Inc • Radiotelephone communications • Delaware
Exhibit 4.38 THIRD SUPPLEMENTAL WARRANT AGREEMENT This Third Supplemental Warrant Agreement (the "Agreement") is made as of March 30, 2000 by and among Splitrock Services, Inc., a Delaware corporation (the "Company"), Splitrock Holdings, Inc., a...Warrant Agreement • May 15th, 2000 • McLeodusa Inc • Radiotelephone communications • New York
Exhibit 4.37 SECOND SUPPLEMENTAL WARRANT AGREEMENT This Second Supplemental Warrant Agreement (the "Agreement") is made as of March 30, 2000 by and among Splitrock Services, Inc., a Delaware corporation (the "Company"), Splitrock Holdings, Inc., a...Warrant Agreement • May 15th, 2000 • McLeodusa Inc • Radiotelephone communications • New York
