Prospectus Supplement Filing Under
Dated: December 6, 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 December 6, 1999, KeySpan Corporation has changed its stock
transfer agent from The Bank of New York to EquiServe Trust Company, N.A. As of
such date, the new Plan Administrator for the KeySpan Corporation Employee
Discount Stock Purchase Plan is now EquiServe Trust Company, N.A.
In terms of the Prospectus, dated May 28, 1998, relating to the Employee
Discount Stock Purchase Plan:
- References to the transfer agent are changed to read EquiServe Trust
Company, N.A.
- References to the "Plan Administrator" should be read to mean
EquiServe Trust Company, N.A. rather than The Bank of New York.
- References to corresponding with the Plan Administrator should read to
direct correspondence to: Stock Transfer Agent, EquiServe Trust
Company, N.A., P.O. Box 2596, Jersey City, NJ 07303-2596.
- References to the Plan Administrator telephone should read as
1-800-633-9394.
- References to the Plan Administrator Internet address should read as:
http://www.equiserve.com.
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.
