1 EXHIBIT 99.4 AMENDED AND RESTATED REGISTRATION AGREEMENT THIS AMENDED AND RESTATED REGISTRATION AGREEMENT (this "AGREEMENT") is made as of September 13, 1999, by and among Allegiance Telecom, Inc. ("ALLEGIANCE"), and the stockholders listed on the...Registration Agreement • September 22nd, 1999 • Allegiance Telecom Inc • Telephone communications (no radiotelephone) • Delaware
Investors Agreement Final -1- 2Investors Agreement • September 22nd, 1999 • Allegiance Telecom Inc • Telephone communications (no radiotelephone) • Illinois
1 EXHIBIT 99.1 COMMON STOCK PURCHASE AND OPTION AGREEMENTCommon Stock Purchase and Option Agreement • September 22nd, 1999 • Allegiance Telecom Inc • Telephone communications (no radiotelephone) • Illinois
1 EXHIBIT 99.2 COUNTERPART AGREEMENT THIS COUNTERPART AGREEMENT (this "Agreement") is made as of September 13, 1999, by and among the parties listed on the signature pages hereto (collectively, the "Sellers"), Reed E. Hundt ("Hundt") and Gregory E....Counterpart Agreement • September 22nd, 1999 • Allegiance Telecom Inc • Telephone communications (no radiotelephone) • Illinois
