Hart-Scott-Rodino Antitrust Improvements Act, page-17

I don't believe there is any cause for concern and it is just a matter of legislative formality. According to the last annual report Of the 2,028 transactions submitted only 45 second requests were issued (basically saying you need to change something before this can occur), so only 2.2% are "rejected".

Of those issued second requests, 34 of 45 were for transactions of 500m+. So statistically speaking the odds of this not going through are 0.54%.

Further, as the equity of $25m at 15% premium of today's price would equal only 1% of market cap I can't see any concerns arising.

https://www.winston.com/en/competition-corner/hsr-annual-report-shows-more-mergers-and-fewer-second-requests-but-continued-and-aggressive-challenges.html