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6/22/1979-  2 for 1 Stock Split
Record Date:  5/21/1979
Mobil Corp
Marcor Inc.
Merger into Mobil Corp.
Per share of Marcor common 0.16 shares of
Mobil Corp and $30 Mobil Corp debenture 8 1/2s
due 6-15-2001
Per share of Marcor convertible preffered 0.32
shares Mobil Corp and $60 Mobil Corp debenture
8 1/2s due6/16/2001

Taxability: Taxable, resulting in gain or loss,
computed by comparing market value of
debenture and common stock plus amount of
cash received in lieu of fractions with basis of
common or preferred surrendered.
10/31/1968 - Marcor Inc. Was formed from Montgomery Ward & Co and Container Corp of America.
6/29/1981 - 2 for 1 Stock Split
Record Date:  5/22/1981
6/24/1997 - 2 for 1 Stock Split
Record Date:  5/20/1997
Superior Oil Co.
Merger into Mobil Corp.
Shareholders of each share
of Superior Oil received
$20 cash and $25 Mobil
Corp debentures in this
taxable transaction.
ExxonMobil Corp.
Merged into Exxon Corp. Upon merger Exxon changed its name to Exxon Mobil Corp.
For each share of Mobil Corp shareholders received 1.32015 shares of Exxon Mobil Corp. Cash paid for fractional shares.
XTO Energy
7/18/2001 - 2 for 1 Stock Split
Record Date:  6/20/2001
Merger XTO Energy who's shareholders received 0.7098 shares of Exxon Mobil for each share of XTO Energy. Cash paid for fractional shares. New basis in Exxon Mobil is the same as old basis in XTO after adjusting for fractional shares sold.
This chart will give you a good visual overview of ExxonMobil stock splits,name changes,mergers and spin-offs. Included is the original merger of Mobil Corp and Marcor Inc. As well as the merger with Superior Oil Co and merger with Exxon Corp into ExxonMobil and the merger with XTO Energy. See MobilExxon, Stock, Dividend and Corporate History.


Here is a flowchart to help you determine ExxonMobil cost basis.