A&O Shearman are most popular: within Insolvency/Bankruptcy/Re-Structuring, Consumer Protection and Law Department Performance topic(s) Any dealmakers who have tried to track the revisions to the Hart-Scott-Rodino (HSR) Premerger Notification and Report Form (the “HSR form”) over the past several years are likely suffering from some form of whiplash. Changes have been numerous, significant, and difficult to track, even for antitrust practitioners who regularly file HSR notifications.