AUSTRALIAN WORLDWIDE EXPLORATION: Bruce Phillips acquired 1 million ordinary shares at $2.99 per share in on market trade. He also exercised 1 million options exercisable at 76c, expiring June 20, 2007 pursuant to the share option plan.

Following these transactions, which occurred between May 14 and May 21, he now holds, directly and indirectly, a total of 3.74 million ordinary shares; 1 million employee options exercisable at 76c/share, expiring June 20, 2007; 1 million employee options exercisable at $1.91/share, expiring November 22, 2009; 300,000 employee options exercisable at $2.10 expiring November 24, 2010; 300,000 employee options exercisable at $2.21 expiring November 24, 2010; and 300,000 employee options exercisable at $2.31 expiring November 24, 2010.

AMP Limited and its related bodies corporate increased their substantial shareholding to 7.41% on May 17.

BHP BILLITON: BHP Billiton Limited announced that on May 18, 2007 it purchased 649,214 ordinary shares of BHP Billiton Plc at an average price of £11.95 per ordinary share.

BHP Billiton Plc now holds 25.16 million of its ordinary shares as treasury shares and BHP Billiton Limited holds 22.21 million of the ordinary shares in BHP Billiton Plc, for a total of 47.37 million shares. The total number of BHP Billiton Plc ordinary shares in issue (excluding shares held as treasury shares and shares held by BHP Billiton Limited) is 2.32 billion.

CENTRAL PETROLEUM: In on-market trades on May 17 and 18, John Heugh acquired 165,000 listed options, exercisable at 20c by June 30, 2007 for a total consideration of $1610.

Following these transactions, he now holds, directly, 5.10 million ordinary fully paid shares (subject to escrow until March 6, 2008); 2.5 million options over ordinary fully paid shares exercisable by payment of 20c each at any time up to May 31, 2010 (subject to escrow until March 6, 2008); and 165,000 listed options over ordinary fully paid shares exercisable by payment of 20c each at any time up to June 30, 2007.

INCREMENTAL PETROLEUM: Merrill Lynch & Co became a substantial shareholder on May 11, with a voting power of 5.41%.

MEO AUSTRALIA: On May 23, John Newton acquired a relevant interest in 77.11 million shares held by Cambrian Oil and Gas.

Cambrian is a major shareholder in MEO Australia and is a wholly owned subsidiary of Xtract Energy. Newton is Xtract Energy chief executive.

Following this acquisition, Newton holds, indirectly, 620,508 shares, 1 million November 30, 2009 options and 77.11 million shares held by Cambrian.

MERMAID MARINE: Merrill Lynch & Co became a substantial shareholder on May 8, with a voting power of 6.37%.

MOSAIC OIL: Peter Reid acquired 250,000 shares at 15.5c/share in on-market trade on May 21. Following this transaction, he now holds, indirectly, 250,000 shares.

NEXUS ENERGY: Neil Ferguson acquired 100,000 ordinary shares at 117c/share in on-market trade on May 22, taking his total holding, held indirectly, to 100,000 ordinary shares. Mathews Capital Partners became a substantial shareholder on May 23, with a voting power of 5.09%.

OIL SEARCH: JPMorgan Chase & Co and its affiliates ceased to be a substantial shareholder on May 17.

ROC OIL COMPANY: John Doran acquired 300,000 unquoted executive share options on May 10, at prices determined in accordance with the company executive share option scheme.

Following this issue, he now holds, directly and indirectly, 4.47 million shares, 364,032 shares, 15,250 shares and 300,000 executive share options.

TEXON PETROLEUM: David Mason, Peter Dighton and John Armstrong, who were appointed as directors on May 17, have the following holdings:

Mason holds a direct interest in 15 million fully paid ordinary shares, 1.5 million unlisted tranche 1(a) options, 2 million unlisted tranche 1(b) options and 3.5 million unlisted tranche 2 options.

Dighton holds a direct interest in 200,000 fully paid ordinary shares, 200,000 unlisted tranche 1 options and, 200,000 unlisted tranche 2 options.

Armstrong holds a direct interest in 2 million fully paid ordinary shares, 1 million unlisted tranche 1(a) options, 1 million unlisted tranche 1(b) options and 2 million unlisted tranche 2 options. He also holds an indirect interest in 400,000 fully paid ordinary shares.

Bernard Rowley, who was appointed as a director on January 31, holds a direct interest in 200,000 unlisted A class options.