NEW YORK, July 21 (Reuters) - Activist investor Elliott

Investment Management has a large investment in data center

operator Equinix ( EQIX ) and has increased its stake in the

last weeks, a person familiar with the matter said on Monday,

after the company's stock price tumbled last month.

The hedge fund, which has made a string of profitable

technology investments including bets on Salesforce ( CRM ),

Texas Instruments ( TXN ) and Hewlett Packard Enterprise ( HPE )

, has been holding discussions with Equinix ( EQIX ), said the

person, who was not permitted to discuss the private talks

publicly. Neither Elliott's exact demands for the company nor

the exact size of the stake could be learned.

Equinix's ( EQIX ) stock price climbed 1.5% on Monday to close

trading at $789.19.

Elliott swooped in after Equinix ( EQIX ) investors were caught off

guard at the company's analyst day last month by news of a

higher than expected capital expenditure plan that sparked a

sharp sell-off. The stock price tumbled 18% in the two trading

sessions following the June 25 analysts day, the first for

Equinix's ( EQIX ) new chief executive officer, Adaire Fox-Martin.

Demand for data centers is growing as AI adoption grows and

analysts have said Equinix ( EQIX ) is positioned to capture some of the

demand.

Bloomberg first reported the news of Elliott's investment in

Equinix ( EQIX ).