COPENHAGEN, April 2 (Reuters) - Sweden's largest insurer

Folksam said on Wednesday it has sold its stake in electric car

maker Tesla over concerns about the company's stance on

workers' rights.

Folksam said in a statement it had tried to influence Tesla,

together with other owners, through proposals submitted to the

company's annual general meeting two years in a row.

"Unfortunately, no improvement has been seen and a decision

has therefore been made to divest the holding," its head of

asset management and sustainability Marcus Blomberg said.

It was not immediately clear how many shares Folksam had

sold.

The U.S. electric vehicle maker headed by billionaire Elon

Musk is at the centre of a dispute in Sweden over its refusal to

sign a collective bargaining agreement and thus allow a labour

union to negotiate on behalf of workers.

Tesla did not immediately respond to a request for comment.