Gibraltar has pledged to increase moves to share confidential information with overseas tax investigators, after having joined a “white list” of co-operative financial jurisdictions, media reports said.

The offshore centre signed tax information exchange agreements yesterday with Finland, Greenland and the Faroe Islands, bringing its total tally to 13. The number means that Gibraltar is placed on a “white list” of nations deemed to be fully compliant in helping to root out tax evaders, according to standards laid down by the Organisation for Economic Co-operation and Development.

"For Gibraltar this is not a 'numbers game'. We are committed to the underlying principles of the commitments that we gave," the government of Gibraltar said in a statement.

"Therefore, in addition to these 13 signed agreements, we have already negotiated and initialled several more, which will be signed when the other countries complete their internal constitutional procedures for doing so. Our offer to sign a TIEA with whatever country wants to sign one with us remains open."

Dozens of jurisdictions have been signing TIEAs, following the move by large industrialised and emerging market nations this year to crack down on what they regard as uncooperative tax havens.