The Transnational Boxing Rankings Board's latest rankings- those based on fights held through October 16, 2021- were posted on the TBRB's website October 18, 2021. There were changes to the rankings of the cruiserweight, middleweight, junior welterweight, featherweight, and junior flyweight divisions.

CRUISERWEIGHT:

Champion: Mairis Briedis

1 (1) Lawrence Okolie
2 (2) Yuniel Dorticos
3 (3) Ilunga Makabu
4 (4) Thabiso Mchunu
5 (6) Aleksei Papin
6 (7) Michal Cieslak
7 (8) Mateusz Masternak
8 (9) Brandon Glanton
9 (10) Efetobor Apochi
10 (-) Richard Riakporhe

Out from rankings posted October 11, 2021:
#5 Kevin Lerena- extended in-division inactivity

Editor's Note: Lerena, who last fought as a cruiserweight on 2/8/20 (TKO-6 win over Firat Arslan), stopped Patrick Ferguson in the fifth round of a "bridgerweight" bout on 12/19/20. He (Lerena) recently vacated the IBO World cruiserweight title and has announced he will be fighting as a heavyweight in the near future.

MIDDLEWEIGHT:

Champion: VACANT

1 (1) Gennady Golovkin
2 (2) Jermall Charlo
3 (3) Demetrius Andrade
4 (4) Jaime Munguia
5 (5) Sergiy Derevyanchenko
6 (6) Zhanibek Alimkhanuly
7 (9) Chris Eubank, Jr.
8 (7) Maciej Sulecki
9 (8) Liam Williams
10 (10) Felix Cash

Out from rankings posted October 11, 2021:
No one

JUNIOR WELTERWEIGHT:

Champion: Josh Taylor

1 (1) Regis Prograis
2 (2) Jose Carlos Ramirez
3 (3) Jose Zepeda
4 (4) Viktor Postol
5 (5) Arnold Barboza, Jr.
6 (6) Gervonta Davis (is also ranked #1 at 130 and #7 at 135)
7 (-) Sandor Martin
8 (7) Montana Love
9 (8) Robert Easter, Jr.
10 (9) Jack Catterall

Out from rankings posted October 11, 2021:
#10 Subriel Matias

FEATHERWEIGHT:

Champion: OPEN

1 (1) Mauricio Lara
2 (3) Emanuel Navarrete
3 (2) Kid Galahad
4 (4) Tugstsogt Nyambayar
5 (5) Josh Warrington
6 (6) Eduardo Ramirez
7 (7) Leigh Wood
8 (8) Mark Magsayo
9 (9) Michael Conlan
10 (10) Joet Gonzalez

Out from rankings October 11, 2021:
No one

Editor's Note:
- #4 ranked Tugstsogt Nyambayar fought and lost as a junior lightweight on July 3, 2021 (UD 12 to Chris Colbert). He last fought as a featherweight on September 19, 2020 (SD 12 win over Cobia Breedy).

JUNIOR FLYWEIGHT:

Champion: OPEN

1 (1) Masamichi Yabuki
2 (2) Hiroto Kyoguchi
3 (3) Felix Alvarado
4 (-) Jonathan Gonzalez
5 (5) Kenshiro Teraji
6 (4) Elwin Soto
7 (6) Mark Vicelles
8 (7) Sivenathi Nontshinga
9 (8) Esteban Bermudez
10 (9) Jesse Rodriguez

Out from rankings posted October 11, 2021:
#10 Daniel Matellon