Merger filing thresholds updated; optional detailed form for higher market positions, timelines, fees and disclosure obligations adjusted. Notices shall ordinarily be filed in Form I; parties may optionally file Form II in transactions involving overlapping or vertically related activities where combined market positions exceed specified thresholds, and statutory timelines for scrutiny begin from receipt of Form II. Asset transfers in related step transactions require attribution of the transferor's assets and turnover to the transferee for reportability. Specified acquisitions by financial investors may be filed without fee in a separate form and late filings may be admitted. The fee schedule is increased and a non confidential summary of the combination must be supplied with the notice.