EVENT 306 Open/Male 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Lucas Thorne | 10 | Bo Stockton | |
| 3 | 4 | Sebastian Bodnar | 10 | Darlington | |
| 4 | 3 | Freddie Matthews | 13 | Middlesboro | |
| 5 | 1 | Freddy Bonner | 13 | Bo Stockton | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Alfie Wood | 14 | Middlesboro | |
| 2 | 8 | Oliver Hall | 11 | Hartlepool | |
| 3 | 10 | Joseph Knowles | 11 | Darlington | |
| 4 | 9 | Matthew Blackmore | 12 | Middlesboro | |
| 5 | 7 | Samuel Davies | 10 | Middlesboro | |
| 6 | 5 | Oscar Wardle | 11 | Hetton | |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 12 | Michael Charge | 12 | Bo Stockton | |
| 2 | 15 | Freddie Fawcett | 13 | Billingham | |
| 3 | 17 | Harvey Watson | 12 | Middlesboro | |
| 4 | 16 | Sebastian Dalby | 13 | Middlesboro | |
| 5 | 13 | Ethan Paylor | 12 | Middlesboro | |
| 6 | 11 | Owen Harrington | 15 | Loftus Dol | |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 19 | Jack Poyser | 14 | Bo Stockton | |
| 2 | 21 | William Oliver | 13 | Darlington | |
| 3 | 23 | William Proud | 13 | Middlesboro | |
| 4 | 22 | Orin Connolly | 13 | Middlesboro | |
| 5 | 20 | Toby Risebrow | 13 | Loftus Dol | |
| 6 | 18 | Jake Reddivari | 12 | Middlesboro | |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 25 | Nikhil Shouri | 15 | Bo Stockton | |
| 2 | 27 | Jacob Nixon | 14 | Middlesboro | |
| 3 | 29 | Shay Downey | 14 | Middlesboro | |
| 4 | 28 | Jacob Money | 14 | Guisborough | |
| 5 | 26 | Sebastien Mason | 14 | Middlesboro | |
| 6 | 24 | Adam Shipley | 12 | Middlesboro | |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 31 | Archie Murgatroyd | 13 | Middlesboro | |
| 2 | 33 | Jack Waterson | 13 | Middlesboro | |
| 3 | 35 | Codrin Catana | 16 | Bo Stockton | |
| 4 | 34 | William Chadaway | 15 | Bo Stockton | |
| 5 | 32 | Steven Horner | 52 | Billingham | |
| 6 | 30 | William Lawson | 16 | Billingham | |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 37 | Stanley Dawson | 14 | Middlesboro | |
| 2 | 39 | Edward Redshaw | 17 | Middlesboro | |
| 3 | 41 | William Morris | 19 | Bo Stockton | |
| 4 | 40 | Elliot Arnell | 16 | Bo Stockton | |
| 5 | 38 | Daniel Roberts | 14 | Billingham | |
| 6 | 36 | Lewis Peggs | 15 | Loftus Dol | |