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12/31/1983
12/15/1994
4/1/1997
12/29/2006
11/18/2005
10/08/1999
Associated Communications Corp
Pacific Telesis Group
Southern New England Telecommunications Corporation
5/22/1987 -  3 for 1 Stock Split
Record Date:  5/4/1987
5/25/1993  2 for 1 Stock Split
Record Date: 5/7/1993
10/3/1994  Changed name from Southwestern Bell Corp to SBC Communications Inc.
AT&T Corp.
Type:     Divestiture of AT&T
Shares:  1 share Southwestern
Bell
         for each 10 shares of pre-
divestiture AT&T held
Basis Allocation: .09488 of
original AT&T Basis.
3/19/1998 - 2 for 1 Stock Split
Record date: 2/20/1998
SBC AT&T Merger
Ameritech
Bell South
Pacific Telesis Group.Shareholders
of which received 0.73145 shares of
SBC for each share of their
company.Cash paid for fractional
shares.Basis Allocation: 100% of
previous basis to SBC.
Acquired Southern New England
Telecommunications Corp. - 
Shareholders of which received
1.7568 shares of SBC for each share
of their company. Cash paid for
fractional shares.
Basis Allocation: 100% of previous
basis to SBC.
Acquired Ameritech Corp.
Shareholders of which received
0.73145 shares of SBC for each share
of their company. Cash paid for
fractional shares.
Basis Allocation: 100% of previous
basis to SBC.
12/1/2005 NYSE ticker changed from SBC to T
Type:     Merger
Shares:  0.36 shares of SBC for each
1 share of Associated
Communications Corp
Basis Allocation:100% of previous
basis allocated to new merged
company. Cash paid for fractions.
10/26/1998
Merger. Each share of the old AT&T
Corp Stock was exchanged for
0.77942 shares of the new AT&T Inc.
SBC is now named AT&T Inc. Cash
paid for fractional shares.
Basis Allocation: 100% of previous
basis to the new AT&T Inc

Here is a flowchart to help you determine AT&T Inc. cost basis.

This chart will give you a good visual overview of AT&T Inc stock splits,name changes,mergers and spin-offs. Included is the original divestiture of Southwestern Bell from the Old AT&T Corp, the name change in 1994 to SBC. The mergers with Associated Communications Corp, Pacific Telesis, Southern New England Telecommunications Corporation, Ameritech, the old AT&T Corp, and Bell South. See AT&T Inc. (new) Stock, Dividend and Company History
Southwestern Bell
Acquired  Bell Sourth Corp. Shareholders of which received 1.325 shares of AT&T for each share of their company. Cash paid for fractional shares.
Basis Allocation: 100% of previous basis to SBC.

AT&T Inc.

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