Open/Male - Short Course - 400m Freestyle - Aberystwyth and District Swimmin - All Time - Open Age Group
| Rank | Name | Ranked Club | YoB | Meet | Date | Time |
|---|---|---|---|---|---|---|
| 1 | James Raw | Leic Sharks | 07 | Swim England Winter Championships 2023, Sheffield | 17/12/23 | 3:57.56 |
| 2 | Sam Middleton | Aberystwyth | 89 | West Wales Area Champs, Penlan Swansea | 11/02/06 | 4:06.58 |
| 3 | Joshua Nathanie Harries | Aberystwyth | 92 | West Wales Regional Champs, Penlan | 15/02/07 | 4:10.97 |
| 4 | Sion Owen | Aberystwyth | 94 | West Wales Regional Champs, Haverfordwest | 07/02/10 | 4:23.05 |
| 5 | Steffan Herdman | Aberystwyth | 99 | Swim Wales West Regional Championships, Haverfordwest | 04/02/17 | 4:26.51 |
| 6 | James Payne | Aberystwyth | 01 | Swim Wales West Regional Championships, Haverfordwest | 04/02/17 | 4:29.36 |
| 7 | Jacob Massey | Aberystwyth | 03 | Swim Wales West Sub Regional Championships, Haverfordwest | 24/11/19 | 4:42.35 |
| 8 | Isaac Williamson-Evans | Aberystwyth | 97 | West Wales Sub Regional Competition 2012, Haverfordwest | 24/11/12 | 4:53.12 |
| 9 | Jude Coleridge | Aberystwyth | 04 | Shrewsbury ASC Autumn Open Meet, Wolverhampton | 06/10/18 | 5:00.27 |
| 10 | Maxwell Glasser | Aberystwyth | 98 | West Wales Sub Regional Competition 2014, Haverfordwest | 29/11/14 | 5:00.75 |
| 11 | Morgan Evans | Aberystwyth | 01 | Swim Conwy Whitsun Meet, Llandudno | 28/05/16 | 5:01.42 |
| 12 | Tomos Watson | Aberystwyth | 97 | West Wales Championships, Haverfordwest | 10/02/13 | 5:01.63 |
| 13 | Benjamin Jones | Aberystwyth | 96 | Wrexham 5th Spring Meet, Wrexham | 03/05/08 | 5:05.71 |
| 14 | Jamie Owen | Aberystwyth | 95 | West Wales Regional Champs, Haverfordwest | 07/02/10 | 5:11.00 |
| 15 | Teilo Courtier-Lilley | Aberystwyth | 99 | Torfaen Open Meet, Newport | 26/06/11 | 5:40.67 |
| 16 | Morgan Revell | Aberystwyth | 99 | West Wales Sub Regional Competition 2012, Haverfordwest | 24/11/12 | 5:41.22 |
| 17 | Joseph Gorman | Aberystwyth | 04 | Conwy County Aquatics Autumn Meet, Llandudno | 15/10/16 | 6:04.30 |
| 18 | Ruben Meaney | Aberystwyth | 04 | Swim Wales West Region Sub Regional Championships, Haverfordwest | 28/11/15 | 6:11.18 |
| 19 | Charlie Jones Lewis | Aberystwyth | 06 | SW West Region Sub Regional Championships, Haverfordwest | 24/11/18 | 6:24.09 |
| 20 | Ioan Mabbutt | Aberystwyth | 06 | SW West Region Sub Regional Championships, Haverfordwest | 24/11/18 | 6:25.20 |
| 21 | Dylan Skym | Aberystwyth | 01 | West Wales Sub Regional Competition 2014, Haverfordwest | 29/11/14 | 6:25.22 |
| 22 | Ioan Evans | Aberystwyth | 06 | Swim Wales West Sub Regional Championships, Haverfordwest | 24/11/19 | 6:26.44 |
| 23 | Noa Jones | Aberystwyth | 09 | Swim Wales West Sub Regional Championships, Haverfordwest | 23/11/19 | 6:26.82 |
| 24 | James Michael | Aberystwyth | 00 | West Wales Sub Regional Competition, Haverfordwest | 03/12/11 | 6:27.81 |
| 25 | Kieron Owen | Aberystwyth | 98 | West Wales Regional Champs, Haverfordwest | 14/02/10 | 6:29.89 |
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