| Event | Rank | Mark | By | Meet |
| B-400 | 1 | 49.64 | Okoro, Simeon (2015) (Weston, CT) (US#77) | Yale HS Track Classic(CT), 2015-01-17(#1) |
| B-400 | 2 | 50.03 | Keating, Johnathan (2015) (Ridgefield, CT) | New Balance Indoor Nationals - Emerging Elites(NY), 2015-03-14(#8) |
| | | National Elites above. State Elites below | | |
| B-400 | 3 | 50.71 | Fraser, Austin (2015) (Seymour, CT) | Yale HS Track Classic(CT), 2015-01-17(#2) |
| B-400 | 4 | 51.32 | Gleen, Tyler (2017) (Trumbull, CT) | New Balance Indoor Nationals - Emerging Elites(NY), 2015-03-14(#26) |
| B-400 | 5 | 51.39 | Cobb, Griffin (2016) (Mark T. Sheehan, CT) | New Balance Indoor Nationals - Emerging Elites(NY), 2015-03-14(#28) |
| B-400 | 5 | 51.39 | Stewartson, Brendon (2016) (Hillhouse, CT) | Yale HS Track Classic(CT), 2015-01-17(#7) |
| B-400 | 7 | 51.42 | Mackay-Morgan, Christian (16) (Northwest Catholic, CT) | Yale HS Track Classic(CT), 2015-01-17(#8) |
| B-400 | 8 | 51.53 | Swain, Tyreise (2017) (Hillhouse, CT) | Yale HS Track Classic(CT), 2015-01-17(#9) |
| B-400 | 9 | 51.84 | Dinsmore, Brandon (2015) (East Lyme, CT) | East Coast Championship Meet(RI), 2015-01-17(#2) |
| B-400 | 10 | 51.87 | Bell, Aaron (Windsor, CT) | Hispanic Games(NY), 2015-01-10(#22) |
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| | | See more performances for B-400 | | |
