Filing charges are published in the USCIS fee schedule, Form G-1055, and an L petition carries more than one of them, with premium processing available separately. The larger expense for a small group is professional time assembling corporate evidence and answering a request for evidence if one issues.
Budget for the evidence, not only the filing
Because amounts are revised periodically, Form G-1055 should be consulted on the day of filing rather than quoted from memory, and a company should expect more than a single line item on an L petition. Premium processing buys a faster decision and is worth considering where a closing date and a start date are close together. What tends to dominate the real cost is preparation.
Corporate records for two jurisdictions must be gathered, translated where necessary, and organized so the ownership chain reads clearly. A support letter describing function management has to be drafted against the evidence rather than around it. If a request for evidence arrives, responding well means producing material that should have been in the original filing, at a point when the acquisition is already consuming management attention.
Larger organizations meeting published criteria can use a blanket L arrangement, but a company of this size will file individually.