Adds Grab response in paragraph 12 and GoTo share price in paragraph 13

By Yantoultra Ngui

SINGAPORE, March 19 (Reuters) - The Competition and Consumer Commission of Singapore said on Wednesday it had not received notification from ride and delivery companies Grab GRAB.O or GoTo GOTO.JK on a proposed merger.

The commission said that it is aware of media reports regarding a possible merger between the two companies, and that the parties should seek legal advice on whether any proposed merger complies with competition laws in Singapore.

"CCCS is open to engaging with the parties via our merger notification and pre-notification discussion processes," it said in an emailed statement to Reuters.

Singapore-headquartered Grab, which is backed by Uber UBER.N, and its smaller Indonesian rival GoTo, have reportedly engaged in several rounds of talks over a potential merger.

GoTo reiterated on Wednesday that there was no agreement with any party about a potential transaction after Bloomberg News reported this week that Grab had begun due diligence to take over GoTo.

If combined, Grab and GoTo would hold a market share of almost 90 percent in Singapore and more than 91 percent in Indonesia in the ride-hailing sector, according to Euromonitor International.

CCCS in 2018 fined Grab and Uber a combined S$13 million ($9.76 million) after Grab failed to notify it of its merger with Uber, which substantially reduced competition in Singapore.

Last year, Grab called off its proposed acquisition of Singapore's third-largest taxi operator, Trans-cab.

The commission said it can impose penalties of up to 10% of the turnover of a company's business in Singapore for each year of infringement, up to a maximum of three years, if a company is found to have breached competition laws.

"Directions can be made under the law to remedy, mitigate or eliminate the adverse effects arising from the merger, including unwinding the merger," it said.

Where necessary, the CCCS could impose interim measures to preserve market competition, it added.

Grab said it would not comment on rumours or speculation. GoTo said it has no comment beyond its latest disclosure to the stock exchange on Wednesday.

Shares of GoTo dropped 2.4% in Indonesia, underperforming the broader domestic benchmark stock index .JKSE which rose 1.5%.

($1 = 1.3318 Singapore dollars)

(Reporting by Yantoultra Ngui; Editing by Tom Hogue and Rachna Uppal)

((Yantoultra.Ngui@thomsonreuters.com;))