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1/1/1984
2/28/1992
9/19/1994
9/30/1996
7/23/1998
6/15/2000
12/31/1996
8/10/2001
11/18/2005
11/18/2002
7/9/2001
4/14/1994  Changed name from American Telephone and Telegraph Co. To AT&T Corp.
4/15/1999 - 3 for 2 Stock Split
Record Date - 3-31-1999
11/18/2002-  1 for 5 Reverse Stock Split
AT&T Corp.
Type:     Divestiture of AT&T
Shares:  Owners of AT&T keep 1 share of AT&T for every 10 whole shares of AT&T held. (if they had less than 10 shares they got cash instead.)
Basis Allocation: Their basis in post-divestiture AT&T shares was deemed to be 28.4961% of what it was for the pre-divestiture shares. The remainding basis was allocated to the 7 Baby Bells created at divestiture.
Teradata Corp
Type:     Merger
Shares: 0.5802 of AT&T for each 1 share of Teradata Corp.
Basis Allocation:100% of previous basis allocated to new merged company. Cash paid for fractions.
AT&T Corp.
Pre-Divestiture AT&T
McCaw Cellular
Type:  Merger
Shares: Shareholders of McCaw received 1 share of AT&T for each share of McCaw.
Basis Allocation: 100% of previous basis allocated to new merged company. Cash paid for fractions.
Lucent
Type:  Spin-Off
Shares: AT&T Shareholders received 0.32408 shares of Lucent for each share of AT&T held.
Basis Allocation: AT&T - 72.01%, Lucent - 27.99%
NCR
Type:  Spin-Off
Shares: AT&T Shareholders received 0.625 shares of NCR  for each share of AT&T held.
Basis Allocation: AT&T - 95.23%, NCR -4.77%
Teleport Communications Group
Type:  Merger
Shares: Shareholders of Teleport received 0.943 shares of AT&T for each share of their company.
Basis Allocation: 100% of previous basis allocated to new merged company. Cash paid for fractions.
MediaOne Group
Type:     Merger into At&t Corp.
Shares: Shareholders choose from 3 elections per share of
MediaOneGroup:
    Stock Election: 1.4912 shares AT&T Corp. Plus $8.50
cash
   Cash Election: approx 0.8955 shares of AT&T Corp. Plus
approx 39.06 cash.
    Standard Election: 0.95 shares of AT&T Corp, $30.85
cash and addtional $5.42 cash payment.
(if no election is made, Standard Election will be used.)
Cash will be paid for fractions.
Basis Allocation: Basis in AT&T equals basis of shares
surrendered, reduced by amount of cash received and
increased by amount of gain recognized.
AT&T Wireless
Type:  Spin-Off
Shares: AT&T Shareholders received 0.3218 shares of
AT&T Wireless  for each share of AT&T held.
Basis Allocation: AT&T - 77.66%, AT&T Wireless -
22.34%
Liberty Media Group
Type: Split-Off
Shares: Shareholders who subscribed to the split-off
offer received 1 share of Liberty Media Group for
each share of AT&T Liberty Media Group (tracking
stock)  tendered. Liberty Media Group is no longer
owned by AT&T.
AT&T Broadband / Comcast
Type: Spin-Off
Shares: AT&T Shareholders received 0.325 shares of AT&T
Broadband for each share of AT&T held.
Basis Allocation: AT&T - 37.4%,  AT&T Broadband- 62.6%.
All shares of AT&T Broadband were converted into shares of
Comcast shortly after the distribution as result of the merger
of a wholly owned subsidiary of Comcast Corporation with
and into AT&T Broadband. Fractional shares received cash
payments.
SBC AT&T Merger
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. Less adjustments for fractional sales.
This chart will give you a good visual overview of AT&T Corp stock splits,name changes,mergers and spin-offs. Included is the original divestiture basis allocation, merger with Teradata Corp, McCaw Cellular, Spin-offs of Lucent and NCR, merger with Teleport Communications Group, merger with MediaOne Group, spin-off of AT&T Wireless, split-off of Liberty Media Group, spin-off of AT&T Broadband / Comcast, and the SBC AT&T merger. See  AT&T Corp. (old) Stock, Dividend and Corporate Actions

AT&T Corp. (Old)

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