LIGHT S.A. Corporate Taxpayer's ID (CNPJ/MF): 03.378.521/0001-75 Company Registry (NIRE): 33.300.263.16-1 Publicly-Held Company NOTICE TO THE MARKET

Light S.A. ("Light" or "Company"), pursuant to CVM Rule 480 of December 7, 2009, hereby informs its shareholders and the market in general that the risk rating agency Fitch Ratings ("Fitch"), by means of a report issued on May 31, 2017, affirmed the National Long- Term Rating "A- (bra)" for Light and also for its subsidiaries Light Serviços de Eletricidade SA ("Light SESA") and Light Energia SA (" Light Energy "). The outlook has been revised from Negative to Stable.

The change in the rating's outlook for Light and its subsidiaries reflects Fitch's view that Light SESA's Tariff Review, completed in March 2017, was very positive, strengthening Light Group's EBITDA and allowing the gradual reduction of leverage. In addition, Fitch believes that the improvement in credit metrics makes it more favorable for the Light group to adjust its short-term debt rollover needs and strengthen its liquidity position.

Fitch's full report is available on Light's Investor Relations website: www.light.com.br/ir.

June 08, 2017

Ana Marta Horta Veloso

CEO, IRO and Chief Business Development

Light SA published this content on 08 June 2017 and is solely responsible for the information contained herein.
Distributed by Public, unedited and unaltered, on 09 June 2017 14:13:27 UTC.