Ameritech Stock History

att_ameritech_huron_rd_building Many people have AT&T Stock which they previously obtained because they were shareholders of Ameritech Corp. They need to find their cost basis and find historical stock price to calculate their cost or basis in it.  You can find very little data available on the internet concerning Ameritech stock history.  We put together theses charts to help you.  We researched the prices carefully, however, use these at your own risk.  

General Info

On this current page we show a summary of important corporate changes such as mergers, stock-splits and  share exchange factors. You can get a good summary overview of information affecting your cost basis in this stock by reviewing this chart.


We present Month by Month Stock Prices from January 1984 through October 1999.  In addition we provide Prices at end of month for year referenced . We derived Stock Prices from archived issues of the NY Times, Standard and Poor’s Stock Price Record, Yahoo Finance historical quotes, and  from various Shareholder Services pages available on the internet from surviving companies. We provide additional external sources at the bottom of this page as Helpful Links.

Cost Basis Ref-Sheet

The ref-sheet shows you the Date and amount of Dividends paid and the price of Ameritech stock when the dividend was paid.  The ref-sheet also shows you information on mergers stock split and spin-offs.  We built the Ref-Sheet as a handy sheet to assist you when you are trying to find the effect of dividends on your cost basis calculations.

Ameritech Corp Selected Important Corporate Changes

01/01/1984Owners of AT&T on 12/31/1983 received 1/10 share of American Information Technologies (AIT)
for every share of AT&T held. Their cost basis in those shares was deemed to be 10.342% of
their previous cost basis in AT&T.
02/02/19873 for 2 Stock Split
01/26/19892 for 1 Stock Split
04/26/1991Name changed from American Information Technologies Corp. to Ameritech Corp
2 for 1 Stock Split
01/26/19982 for 1 Stock Split
Merged into SBC Communications Inc.
Shareholders of Ameritech received 1.316 shares of SBC for each share of Ameritech.

*For a visual chart of AT&T Inc. which includes Ameritech corporate changes, visit AT&T Inc Chart.

AT&T Inc Helpful Links

AT&T Inc Investor Relations Historical QuotesAT&T Inc Investor relations website. Careful most everything is split adjusted. Also has data for Ameritech, AT&T Corp (old), BellSouth, Pacific Telesis, and SNET