The Transnational Boxing Rankings Board's latest rankings- those based on fights held through August 7, 2021- were posted on the TBRB's website August 10, 2021. There were changes in the rankings for the featherweight, bantamweight, and flyweight divisions.

FEATHERWEIGHT:

Champion: OPEN

1 (1) Gary Russell, Jr.
2 (2) Mauricio Lara
3 (4) Kid Galahad
4 (3) Emanuel Navarrete
5 (5) Tugstsogt Nyambayar
6 (6) Jessie Magdaleno
7 (7) Josh Warrington
8 (8) Eduardo Ramirez
9 (10) Leigh Wood
10 (-) Michael Conlan

Out from rankings August 3, 2021:
#9 James Dickens

Editor's Note:
- #1 ranked Gary Russell, Jr. has not fought since he won by UD 12 over Tugstsogt Nyambayar on February 8, 2020.

BANTAMWEIGHT:

Champion: OPEN

1 (1) Naoya Inoue
2 (2) Nonito Donaire
3 (3) John Riel Casimero
4 (4) Emmanuel Rodriguez
5 (5) Guillermo Rigondeaux (is also Champion at 122)
6 (6) Nordine Oubaali
7 (7) Takuma Inoue
8 (9) Lee McGregor
9 (8) Jason Moloney
10 (10) Rau'shee Warren

Out from rankings posted August 3, 2021:
No one

FLYWEIGHT:

Champion: OPEN

1 (1) Julio Cesar Martinez
2 (2) Sunny Edwards
3 (3) Moruti Mthalane
4 (5) Sho Kimura
5 (6) Junto Nakatani
6 (7) Cristofer Rosales
7 (8) Ricardo Sandoval
8 (9) Muhammad Waseem
9 (-) McWilliams Arroyo
10 (-) Giemel Magramo

Out from rankings posted August 3, 2021:
#4 Artem Dalakian (prolonged inactivity)
#10 Luis Concepcion (prolonged inactivity)

Editor's Note:
- #4 ranked Sho Kimura last fought on February 15, 2020 (TKO-2 win over Merlito Sabillo).