Prospectus Supplement Filing Under
Dated: August 12, 1999 Rules 424(b)(3) and 424(c)
To Prospectus dated May 28, 1998 Registration File No. 333-53765
KEYSPAN CORPORATION
EMPLOYEE DISCOUNT STOCK PURCHASE PLAN
Effective May 20, 1999, MarketSpan Corporation changed its corporate name
to KeySpan Corporation, and is currently doing business as KeySpan Energy. As of
such date, the MarketSpan Corporation Employee Discount Stock Purchase Plan is
now the "KeySpan Corporation Employee Discount Stock Purchase Plan."
In terms of the Prospectus, dated May 28, 1998, relating to the Employee
Discount Stock Purchase Plan:
- References to MarketSpan Corporation are changed to read KeySpan
Corporation.
- References to the "Company" should be read to mean KeySpan Corporation
or its wholly-owned subsidiaries rather than MarketSpan Corporation or
its wholly-owned subsidiaries.
Any questions regarding the KeySpan Corporation Employee Discount Stock
Purchase Plan should be directed to a KeySpan representative at 718-403-3196.
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This Prospectus Supplement should be affixed to your copy of the
prospectus dated May 28, 1998.
