<-bsp-bb-link state="{"bbHref":"bbg://securities/XOM%20US%20Equity/SPLC","_id":"0000018f-1a03-d583-afbf-dadfd73e0000","_type":"0000016b-944a-dc2b-ab6b-d57ba1cc0000"}">Exxon Mobil Corp.-bsp-bb-link> expects US antitrust regulators to approve its $60 billion acquisition of Pioneer Natural Resources Co. by the end of June despite increased government <-bsp-bb-link state="{"bbDocId":"SCD5W3T1UM0W","_id":"0000018f-1a03-d583-afbf-dadfd73e0001","_type":"0000016b-944a-dc2b-ab6b-d57ba1cc0000"}">scrutiny-bsp-bb-link>of corporate mergers.