ALINTA: Tricom Holdings increased their substantial shareholding to 6.60% on April 26.

AUSTIN EXPLORATION: Kenneth Goughnour, who resigned as a director on April 10, retains a direct interest in 3,750,000 ordinary shares.

BARAKA PETROLEUM: Shane Doherty, who resigned as a director on April 24, retains an indirect interest in 26,000,000 ordinary shares, 2,000,000 unlisted 20 cent options and 2,000,000 unlisted 25 cent options.

BHP BILLITON: BHP Billiton Limited announced that on May 2, 2007 it purchased 1,000,000 ordinary shares of BHP Billiton Plc at an average price of 1143.4965 pence per ordinary share.

Following the above transaction, BHP Billiton Plc holds 25,160,000 of its ordinary shares as treasury shares and BHP Billiton Limited holds 14,800,000 of the ordinary shares in BHP Billiton Plc, for a total of 39,960,000 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 2,326,502,002.

ENVESTRA: Macquarie Bank Ltd and its related bodies corporate became a substantial shareholder on April 27, with a voting power of 5.04%.

GAWLER RESOURCES: Elixir Petroleum Ltd became a substantial shareholder on March 28, with a voting power of 6.98%,

GREAT ARTESIAN OIL & GAS: Andrew Carroll acquired 100,000 ordinary shares on 22 cents per share in on market trade on April 30, taking his total holding, held indirectly, to 150,000 ordinary shares.

INCREMENTAL PETROLEUM: UBS Nominees and its related bodies corporate ceased to be a substantial shareholder on April 26.

MEO AUSTRALIA: Walter Dewe acquired 296,835 shares for $74,209 on May 3 via exercise of options. Following this transaction, he now holds a total of 1,883,331 Shares and 1,000,000 options expiring November 30, 2009 Options

NEPTUNE MARINE SERVICES: The company notes that Clive Langley, an executive director, has sold 7 million shares in Neptune Marine Services between April 24 and 27. 2007.

Neptune’s recent capital raising, which was announced on April 24, 2007, was heavily oversubscribed and there was still significant demand from a number of institutions. Langley, who remains a significant shareholder with 1.9 million shares, indicated that he was prepared to satisfy some of this demand by sale of his shares on the market.

NEXUS ENERGY: Commonwealth Bank of Australia and its subsidiaries decreased its substantial shareholding to 10.19% on April 20.

OILEX: India Hydrocarbons Ltd became a substantial shareholder on April 30, with a voting power of 6/93%.

OIL SEARCH: JPMorgan Chase & Co. and its affiliates ceased to be a substantial shareholder on April 23.

QUEENSLAND GAS COMPANY: In off market trade on April 26, Dale Elphinstone disposed of 5,400,000 ordinary shares for a total consideration of $8,964,000 representing an average price of $1.66 per ordinary share. Following this transaction, he now holds indirectly, a total of 56,963,939 shares, 471,708 shares and 69,650 shares.

ROC OIL: Merrill Lynch & Co increased their substantial shareholding to 6.35% on March 3.