The Jersey Flegg Cup competition was first run in 1961 and ended in 2007 when the National Youth Competition was introduced. The competition was re-introduced in 2018. These records (apart from Jersey Flegg Titles) are from that season onward.

Jersey Flegg Titles: 9 – 1962, 1964, 1966, 1967, 1968, 1969, 1972, 1978, 2019

Most Games for the Club
32 Tallis Angianga 2019-2021m
28 Luke Puru 2019-2021
26 Josh Fepuleai 2019-2021
26 Lachlan Ilias 2019-2021
26 Peter Mamouzelos 2019-2021
24 Matthew French 2019
24 James Tautaiolefua 2019
23 Nicholas Mougios 2019
21 Luke Bain 2019-2020
21 Augustine Stowers 2019-2021

Most Tries in a Match
3
Jaxson Paulo v Canterbury, ANZ Stadium – Rd 22, 2019. South Sydney lost 12-18.
3 Tallis Angianga v Victoria, Central Coast Stadium – Rd 21, 2019. South Sydney won 64-6.
3
Kane Allan v Wests Tigers, Leichhardt Oval – Rd 9, 2019. South Sydney won 58-18.

Most Tries in a Season
15
Kane Allan in 19 games, 2019
11 Josh Cook in 17 games, 2019
10 James Tautaiolefua in 24 games, 2019
9 Lachlan Ilias in 18 games, 2019
9 Nicholas Mougios in 23 games, 2019

Most Tries for the Club
15
Kane Allan in 19 games
12 Lachlan Ilias in 26 games
11 Tallis Angianga in 32 games
11 Josh Cook in 17 games
10 James Tautaiolefua in 24 games

Most Points in a Season
152
Blake Taaffe in 17 games, 2019 (7T, 62G)
102 Lachlan Ilias in 18 games, 2019 (9T, 32G, 2FG)
60 Kane Allan in 19 games, 2019 (15T)
56 Lathan Hutchinson-Walters in 9 games, 2021 (5T, 18G)
44 Josh Cook in 17 games, 2019 (11T)

Most Points in a Match
20
Lachlan Ilias (10G) v Victoria, Central Coast Stadium – Rd 21, 2019. South Sydney won 64-6.
18 Lathan Hutchinson-Walters (1T, 7G) v Penrith, Ironmark HPC – Rd 11, 2021. South Sydney won 42-14.
18 Blake Taaffe (1T, 7G) v Wests Tigers, Leichhardt Oval – Rd 9, 2019. South Sydney won 58-18.
16 Lachlan Ilias (2T, 4G) v Cronulla, Metricon HPC – Rd 1, 2020. South Sydney won 32-30.
16 Blake Taaffe (1T, 6G) v Cronulla, Leichhardt Oval – Finals Week 2, 2019. South Sydney won 36-31.
16 Lachlan Ilias (2T, 4G) v St George Illawarra, Campbelltown Stadium – Finals Week 1, 2019. South Sydney won 32-24.
16 Blake Taaffe (1T, 6G) v Parramatta, Metricon HPC – Rd 18, 2019. South Sydney won 36-32.

Most Goals in a Match
10
Lachlan Ilias v Victoria, Central Coast Stadium – Rd 21, 2019. South Sydney won 64-6.
7 Lathan Hutchinson-Walters v Penrith, Ironmark HPC – Rd 11, 2021. South Sydney won 42-14.
7
Blake Taaffe v Wests Tigers, Leichhardt Oval – Rd 9, 2019. South Sydney won 58-18.
7 Blake Taaffe v Manly, HE Laybutt Sporting Complex – Rd 4, 2019. South Sydney won 50-10.
6 Blake Taaffe v Cronulla, Leichhardt Oval – Finals Week 2, 2019. South Sydney won 36-31.
6 Blake Taaffe v Parramatta, Metricon HPC – Rd 18, 2019. South Sydney won 36-32.

Most Points for the Club
152 Blake Taaffe in 17 games (7T, 62G)
141 Lachlan Ilias in 26 games (12T, 45G, 3FG)
60 Kane Allan in 19 games (15T)
56 Lathan Hutchinson-Walters in 9 games (5T, 18G)
44 Tallis Angianga in 32 games (11T)
44 Josh Cook in 17 games (11T)

Biggest Winning Margins
58
64-6 v Victoria, Central Coast Stadium – Rd 21, 2019.
50
58-8 v Wests Tigers, Leichhardt Oval – Rd 9, 2019.
40 50-10 v Manly, HE Laybutt Sporting Complex – Rd 4, 2019.
28 42-14 v Penrith, Ironmark HPC – Rd 11, 2021.

Biggest Losing Margins
42
0-42 v Penrith, St Marys Leagues Stadium – Rd 7, 2019.
36 12-48 v Parramatta, Ringrose Park – Rd 7, 2021.
26 12-38 v Canterbury, Belmore Sports Ground – Rd 18, 2022.
24 16-40 v Cronulla, PointsBet Stadium – Rd 20, 2022.
24 18-42 v Sydney, Ironmark High Performance Centre – Rd 3, 2022.

Longest Winning Streaks
6
(Round 24, 2019 – Round 1, 2020)
3 (Round 9, 2021 – Round 11, 2021)
(Round 4, 2019 – Round 6, 2019)

Longest Losing Streaks
3
(Round 6, 2021 – Round 8, 2021)
2
(Round 22, 2019 – Round 23, 2019)
(Round 12, 2019 – Round 13, 2019)

NSW U20 Origin
2
Ky Rodwell (2019), Blake Taaffe (2019)

NSW U19 Origin
1
Terrell Kalo Kalo (2022)

Australian Schoolboys
Lachlan Gale (2019)

Club Player of the Year
2019
Blake Taaffe
2020 Not awarded
2021 
Ben Lovett

NRL Graduates
7
Dean Hawkins (2019), Lachlan Ilias (2019-2021), Peter Mamouzelos (2019-2021), Davvy Moale (2021), Jaxson Paulo (2019), Ky Rodwell (2019), Blake Taaffe (2019)