History:Founded: 1957
In 1999 Excelsior merged with AERA Castor and renamed itself AERA Excelsior Brussel VZWIn 2007-08 Atomia Brussels did not make it to the start of the season. The club from the capital had attracted several players, but when the city government revised its commitments and the sponsors remained absent, the plug went out.
League positions:
League achievements:
Belgian Cup Winner -1984, 88, 95Belgian League Finalist -1986, 17 Belgian League Semifinals -1984, 90, 16, 19 Belgian League Regular Season Runner-Up -1986, 17 Belgian Supercup Finalist -1988 Belgian Cup Finalist -1989 Belgian Supercup Winner -1995 Belgian D2 Semifinals -2012 Belgian D3 (Group B) Runner-Up -2009
European cups:
2016-2017:  FIBA Europe Cup: took 4th (last) place (1-5) in Group A of Stage One2017-2018: FIBA Europe Cup: took 3rd place (2-4) in Group D of Stage One2019-2020: FIBA Europe Cup: took 4th (last) place (2-4) in Group E of Stage One2021-2022:  BNXT League: took 9th place (2-16) in Group Belgioum of Domestic Stage2022-2023: BNXT League: took 10th (last) place (4-14) in Group Belgium of Domestic Stage, took 6th place (5-5) in Group Elite Silver of Stage Two2023-2024: BNXT League: took 6th place (10-10) in Group Belgium of Domestic Stage, took 5th place (7-5) in Group Elite Silver of Stage Two |
| Since 2023 |
 2022-2023 |
 2020-2022 |
 2008-2020 |
 2007-2008 |
 Until 2007 |
League positions:
| Season | Tier | Division | W-L | Position + PlayOff | Cup | European competitions |
|---|---|---|---|---|---|---|
| 1983-84 | 1 | Division I | 14-10 | 4th  lost in Semis 0-2 to Oostende | Winner | |
| 1984-85 | 1 | Division I | 12-14 | 10th | ||
| 1985-86? | 1 | Division I | 19-7 | 2nd  lost in Finals 1-3 to Oostende | ||
| 1986-87? | 1 | Division I | 19-7 | 5th | ||
| 1987-88? | 1 | Division I | 15-9 | 5th | Winner | |
| 1988-89? | 1 | Division I | 16-10 | 6th | Finalist | |
| 1989-90? | 1 | Division I | 17-9 | 4th lost in Semis 0-2 to Mechelen | ||
| 1990-91? | 1 | Division I | 8-16 | 11th | ||
| 1991-92 | 1 | Division I | 11-15 | 8th | ||
| 1992-93 | 1 | Division I | 10-16 | 10th | ||
| 1993-94 | 1 | Division I | 11-15 | 11th | ||
| 1994-95 | 1 | Division I | 17-9 | 5th | Winner | |
| 1995-96? | 1 | Division I | 11-15 | 11th | ||
| 1996-97? | 1 | Division I | 9-17 | 10th | ||
| 1997-98 | 1 | Division I | 11-15 | 8th | ||
| 1998-99 | 1 | Division I | 8-18 | 12th | ||
| 1999-00 | 1 | Division I | 9-17 | 12th | ||
| 2000-01 | 1 | Division I | 6-20 | 14th  | ||
| 2001-04 | 2 | Division II | 2nd  | |||
| 2004-05? | 2 | Division II | 2nd | |||
| 2005-06 | 1 | Division I | 8-24 | 9th | ||
| 2006-07 | 1 | Division I | 11-25 | 9th | ||
| 2007-08? | 1 | Ethias | 3rd | |||
| 2008-09 | 1 | Division I | 2nd | |||
| 2009-10 | 1 | Division I | 4th | |||
| 2010-11 | 1 | Division I | 5th | |||
| 2011-12 | 1 | Ethias | 5th | |||
| 2012-13? | 1 | Ethias | 10th | |||
| 2013-14 | 1 | Ethias | 8-28 | 8th | ||
| 2014-15 | 1 | Scooore | 8-12 | 9th | ||
| 2015-16 | 1 | Scooore | 10-10 | 7th, lost in Semis 2-3 to Okapi Aalst | ||
| 2016-17 | 1 | Euromillions | 22-14 | 3rd lost in Finals 1-3 to Oostende |  FIBA Europe Cup: 4th (Group A) (1-5) | |
| 2017-18 | 1 | Euromillions | 13-23 | 8th, lost in Q-Finals 0-2 to Oostende | FIBA Europe Cup: 3rd (Group D) (2-4) | |
| 2018-19 | 1 | Euromillions | 20-15 | 4th, lost in Semis 0-2 to Telenet Giants | ||
| 2019-20? | 1 | Euromillions | 6-11 | 9th | FIBA Europe Cup: 4th (Group E) (2-4) | |
| 2020-21 | 1 | Euromillions | 4-22 | 10th | ||
| 2021-22? | 1 | PBL | 4th |  BNXT League: 9th (Group Belgium) (2-16) | ||
| 2022-23? | 1 | PBL | 10th | BNXT League: 10th (Group Belgium) (4-14) | ||
| 2023-25 | 1 | PBL | 6th | BNXT League: 6th (Group B) (10-10) | ||
| 2025-26 | 1 | European North Basketball | lost in Quarterfinals 0-2 to Oostende |  European North Basketball League: 17th (3-5) | ||
| BNXT League: 9th (18-16) |
