| MD | Players | Club | Nationality | DOB | A(D) |
|---|---|---|---|---|---|
| 05-Sep-2015 |  Scott Cummings | Glasgow Warriors | Scotland | 03-Dec-1996 | 18(276) |
| 31-Oct-2015 |  Blair Kinghorn | Edinburgh Rugby | Scotland | 18-Jan-1997 | 18(286) |
| 13-Sep-2015 | Owen Watkin | Ospreys | Wales | 12-Oct-1996 | 18(336) |
| 13-Sep-2015 | Sam Underhill | Ospreys | England | 22-Jul-1996 | 19(52) |
| 28-Nov-2015 |  Jarrod Evans | Cardiff Blues | Wales | 25-Jul-1996 | 19(125) |
| 30-Jan-2016 | Jamie Ritchie | Edinburgh Rugby | Scotland | 16-Aug-1996 | 19(166) |
| 16-Oct-2015 |  Sam Arnold | Ulster | Ireland | 08-Apr-1996 | 19(190) |
| 05-Sep-2015 |  Daniel Jones | Scarlets | Wales | 07-Jan-1996 | 19(241) |
| 16-Oct-2015 | Zander Fagerson | Glasgow Warriors | Scotland | 19-Jan-1996 | 19(270) |
| 13-Sep-2015 |  Stephen Fitzgerald | Munster | Ireland | 13-Nov-1995 | 19(304) |
| 05-Feb-2016 | Jacob Stockdale | Ulster | Ireland | 03-Apr-1996 | 19(307) |
| 06-Sep-2015 | Maicol Azzolini | Zebre | Italy | 15-Oct-1995 | 19(326) |
| 11-Sep-2015 | Tyler Morgan | Gwent Dragons | Wales | 11-Sep-1995 | 20(0) |
| 25-Mar-2016 | Dillon Lewis | Cardiff Blues | Wales | 04-Jan-1996 | 20(81) |
| 01-Apr-2016 | Adam Beard | Ospreys | Wales | 07-Jan-1996 | 20(85) |
| 17-Oct-2015 | Garyn Smith | Cardiff Blues | Wales | 12-Jul-1995 | 20(97) |
| 30-Jan-2016 | Marco Lazzaroni | Benetton Treviso | Italy | 18-Aug-1995 | 20(165) |
| 13-Sep-2015 | Rory Thornton | Ospreys | Wales | 16-Mar-1995 | 20(181) |
| 16-Oct-2015 |  Ross Byrne | Leinster | Ireland | 08-Apr-1995 | 20(191) |
| 02-Oct-2015 | Dafydd Howells | Ospreys | Wales | 22-Mar-1995 | 20(194) |
| 12-Sep-2015 | Gary Ringrose | Leinster | Ireland | 26-Jan-1995 | 20(229) |
| 08-Nov-2015 | Ollie Griffiths | Gwent Dragons | Wales | 23-Mar-1995 | 20(230) |
| 26-Mar-2016 | Peter Robb | Connacht | Ireland | 19-Jul-1995 | 20(251) |
| 02-Oct-2015 | D'Arcy Rae | Glasgow Warriors | Scotland | 21-Dec-1994 | 20(285) |
| 11-Sep-2015 | Ashton Hewitt | Gwent Dragons | Wales | 20-Nov-1994 | 20(295) |
| 06-Sep-2015 | Aled Summerhill | Cardiff Blues | Wales | 02-Nov-1994 | 20(308) |
| 05-Sep-2015 | Steffan Evans | Scarlets | Wales | 01-Sep-1994 | 21(4) |
| 05-Sep-2015 | John Madigan | Munster | Ireland | 01-Sep-1994 | 21(4) |
| 04-Sep-2015 | Rory Parata | Connacht | Ireland | 14-Aug-1994 | 21(21) |
| 30-Jan-2016 | Ryan Elias | Scarlets | Wales | 07-Jan-1995 | 21(23) |
| 30-Jan-2016 | Will Boyde | Scarlets | Wales | 15-Dec-1994 | 21(46) |
| 28-Feb-2016 | Tomos Williams | Cardiff Blues | Wales | 01-Jan-1995 | 21(58) |
| 30-Jan-2016 | Gideon Koegelenberg | Zebre | South Africa | 25-Nov-1994 | 21(66) |
| 27-Feb-2016 | Sean O'Brien | Connacht | Ireland | 09-Dec-1994 | 21(80) |
| 06-Nov-2015 | Cian Kelleher | Leinster | Ireland | 07-Aug-1994 | 21(91) |
| 04-Sep-2015 | Dan Leavy | Leinster | Ireland | 23-May-1994 | 21(104) |
| 12-Sep-2015 | Ross Moloney | Leinster | Ireland | 11-May-1994 | 21(124) |
| 29-Jan-2016 | Hallam Amos | Gwent Dragons | Wales | 24-Sep-1994 | 21(127) |
| 06-Sep-2015 | Gabriele di Giulio | Zebre | Italy | 30-Apr-1994 | 21(129) |
| 30-Apr-2016 | Jack Dixon | Gwent Dragons | Wales | 13-Dec-1994 | 21(139) |
| 05-Feb-2016 | Angus O'Brien | Gwent Dragons | Wales | 17-Sep-1994 | 21(141) |
| 19-Feb-2016 | James Malcolm | Glasgow Warriors | Scotland | 23-Sep-1994 | 21(149) |
| 13-Sep-2015 | Nicky Smith | Ospreys | Wales | 07-Apr-1994 | 21(159) |
| 06-Sep-2015 | Ethan Lewis | Cardiff Blues | Wales | 28-Mar-1994 | 21(162) |
| 23-Oct-2015 | Luc Jones | Gwent Dragons | Wales | 12-May-1994 | 21(164) |
| 29-Jan-2016 | Peter Dooley | Leinster | Ireland | 04-Aug-1994 | 21(178) |
| 04-Sep-2015 | Chris Dean | Edinburgh Rugby | Scotland | 05-Mar-1994 | 21(183) |
| 05-Sep-2015 | David Johnston | Munster | Ireland | 28-Feb-1994 | 21(189) |
| 06-Dec-2015 | Oliver Cracknell | Ospreys | Wales | 26-May-1994 | 21(194) |
| 17-Oct-2015 | Simone Ferrari | Benetton Treviso | Italy | 28-Mar-1994 | 21(203) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).