A Practice Note for a buyer to use when determining the size-of-transaction under the Hart-Scott-Rodino (HSR) Act in a merger or other acquisition involving a rollover acquisition, meaning where the target's shareholders receive equity in a newly formed entity as full or partial consideration for their target shares. This Practice Note discusses how to identify rollover transactions and how to value those transactions to determine if a separate HSR filing (sometimes called a backside filing) is required.