Here's a list of the sub 4s in high school.
Alan Webb, 3:53.43 (2001) (Pre)
Jim Ryun, 3:55.3 (1965) ????
Drew Hunter, 3:58.25 (2016) (open meet)
Matthew Maton, 3:59.38 (2015) (college meet)
Grant Fisher, 3:59.38 (2015) (pro meet)
Tim Danielson, 3:59.4 (1966) ???
Michael Slagowski, 3:59.53 (2016) rabbit first 700
Lukas Verzbicas, 3:59.71 (2011) pretty sure he had a rabbit
Marty Liquori, 3:59.8 (1967) ??
All the recent ones have been in races with rabbits or open competition. The one's I'm not sure about are the ones from the 1960s. Can someone help me out.
I'm pretty sure Ryun's first one was just at a Kansas meet without a rabbit. Not sure about Danileson and Liquori offhand.