NEW YORK, May 8 (Reuters) - Citigroup said on Tuesday it is buying a minority stake in Cicada Technologies, a Connecticut-based trading platform focused on Mexican government fixed-income securities.

The bank did not disclose details of the investment, which is being made by Citi's Markets Strategic Investments unit. Other investors in Cicada are Kaszek Ventures, BCP Securities and Dila Capital. Citigroup will also join the platform and act as a liquidity provider.

Cicada owns a broker-dealer regulated by FINRA and its trading system is registered with the Securities and Exchange Commission.

The system trades 28 Mexican government bonds, including nominal fixed-rate notes, known as Mbonos, and inflation-linked securities, known as Udibonos.

The company plans to expand electronic trading to other kinds of government bonds and Mexican corporate securities.

The Mexican fixed income market trades $5 billion to $7 billion daily.

"Around 85% of trades in this market are done in traditional over-the-counter ways and if more of it becomes electronic, it may increase efficiency," said Aldo Alvarez, LatAm Lead at Citi’s Markets Strategic Investments unit. (Reporting by Tatiana Bautzer; editing by Jonathan Oatis)