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AT&T Inc.(formerly SBC Communications, Inc.) is the parent company for BellSouth Corporation, Southwestern Bell Telephone Company, Pacific Telesis Group, Ameritech , and Southern New England Telephone.

BellSouth Corporation (BSTR)

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1990 - 1991

Prior to 12/31/1991, BellSouth Corporation consisted of two separate operating companies: South Central Bell Telephone Company (SCTC) consisting of five study area jurisdictions: Alabama (SCAL), Kentucky (SCKY), Louisiana (SCLA),Mississippi (SCMS) and Tennessee (SCTN), and Southern Bell Telephone and Telegraph Company (SBTC) consisting of four study area jurisdictions: Florida(SBFL), Georgia (SBGA), North Carolina (SBNC), and South Carolina (SBSC).

Note: For years 1990 and 1991, the ARMIS data for the two operating companies have been combined under one COSA (BSTR) within the ARMIS system to allow comparison with later years. Thus, no individual data for COSAs SBTC and SCTC exists within the ARMIS system.

 

1992 - 1994

On 1/1/1992, South Central Bell and Southern Bell were merged, forming BellSouth Telecommunications, Inc. (BSTR), a corporation that is wholly-owned by BellSouth Corporation.

COSA

Effect

SCTC

Discontinued

SBTC

Discontinued

BSTR

New COSA for entity that files as both an operating company and a holding company

 

1995

BellSouth Telecommunications, Inc. had no changes during this period, except that on 1/1/1995, the names South Central Bell and Southern Bell were dropped and only BellSouth Telecommunications, Inc. was used.

 

1996 - 2005

BellSouth Telecommunications, Inc. had no changes during this period.

 

2006

BellSouth Telecommunications, Inc. merged with AT&T on December 29, 2006.

COSA

Effect

BSTR

Brought under the control of AT&T Inc.

2007 - 2009

BellSouth Telecommunications, Inc. had no changes during this period.


Southwestern Bell Telephone Company (SWTR)

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1990 - 1995

Prior to 1990, Southwestern Bell Telephone Company was both a holding company and operating company that consisted of five study area jurisdictions: Arkansas(SWAR), Kansas (SWKS), Missouri (SWMO), Oklahoma (SWOK), and Texas (SWTX).

1995

In 1995, a parent holding company named SBC Communications, Inc. was established, and Southwestern Bell Telephone Company's structural status as a holding company ceased. However, Southwestern Bell Telephone Company still existed as an operating company for its five study area jurisdictions.

COSA

Effect

SWTR

Changed to an operating company only

 

1996 - 2009

Southwestern Bell Telephone Company had no changes during this period.


 

Pacific Telesis Group (PTTR)

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1990 - 1996

Prior to 1990, Pacific Telesis Group was a holding company for two operating companies with one study area jurisdiction each: Pacific Bell, California(PTCA) and Nevada Bell, Nevada (PTNV).

 

1997

SBC Communications, Inc. acquired Pacific Telesis Group on 4/1/1997. SBC Communications, Inc., however, kept Pacific Telesis Group and its operating companies as separate reporting entities.

COSA

Effect

PTTR

Brought under the control of SBC Communications, Inc.

 

 

1998 - 2009

Pacific Telesis Group had no changes during this period.


Ameritech Corporation (AMTR)

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1990 - 1998

Ameritech had no changes during this period. Prior to 1990, Ameritech was holding company for five operating companies with one study area jurisdiction for each: Illinois Bell (LBIL), Indiana Bell (NBIN), Michigan Bell (MBMI), Ohio Bell (OBOH) and Wisconsin Bell (WTWI).

 

1999

Ameritech was acquired by SBC Communications, Inc. on 10/8/1999. SBC Communications, however, kept Ameritech and its operating companies as separate reporting entity.

COSA

Effect

AMTR

Brought under the control of SBC Communications

2000 - 2009

Ameritech had no changes during this period.


 

Southern New England Telecommunications Corporation (SNCT)

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1990 - 1997

Southern New England Telecommunications Corporation had no changes during this period. Southern New England Telecommunications Corporation is a holding and operating company with one study area jurisdiction. The Southern New England Telephone Company is the operating company with one study area jurisdiction: Connecticut.

 

1998 - 1999

SBC Communications, Inc. acquired Southern New England Telecommunications Corporation on 10/26/1998. SBC Communications, Inc., however, kept Southern New England Telecommunications Corporation as a separate reporting entity.

COSA

Effect

SNCT

Brought under the control of SBC Communications, Inc.

 

2000 - 2009

Southern New England Telecommunications Corporation had no changes during this period.

Bureau/Office: 

Updated: 
Thursday, May 14, 2015