History:Founded: 1934 (It is a section of the sports club Polisportiva Mens Sana, founded in 1871)
League positions:
On July 9, 2014 Montepaschi Siena was officially declared bankrupt2019 - team was kicked out of the league in March
League achievements:
Italian Cup Finalist -2002, 14Italian Supercup Finalist -2004, 13 Italian Serie A Semifinals -2003 Italian Serie A Champion -2004, 07, 08, 09, 10, 11, 12, 13 Italian Serie A Regular Season Champion -2004, 07, 08, 09, 10, 11, 12 Italian Cup Semifinals -2006, 07 Italian Cup Winner -2009, 10, 11, 12 Italian Supercup Winner -2007, 08, 09, 10, 12, 14 Italian Serie A Regular Season Runner-Up -2014 Italian Serie A Finalist -2014 Italian B Interregionale Group Centro Finalist -2026 Italian B Interregionale Group C Regular Season Runner-Up -2026 Italian Serie B Group A Regular Season Champion -2015 Italian Serie B Group A Champion -2015 Italian Serie B Champion -2015 Italian Serie C Toscana Finalist -2024 Italian Serie C Tosccana Silver Semifinals -2022 Italian Serie C Toscana B Regular Season Champion -2024 Italian Serie C Silver Group Toscana A Regular Season Runner-Up -2021 Italian Serie C Tosccana Silver Regular Season Runner-Up -2022
European cups:
1993-1994: European Cup2000-2001: FIBA Suproleague: (took 9th place (6-12) in Group A) 2001-2002: Saporta Cup: took 1st place (7-3) in Group B, won the Cup (!!!) beating in the final Pamesa Valencia 81-71 2002-2003: Euroleague Final Four: lost to Benetton 62-65 in semifinals, beat CSKA 79-78 in 3rd place game 2003-2004:  Euroleague: took 5th place (7-7) in Group B, then took 1st place (4-2) in Group F of Top16: Semifinals !!! Lost 3rd place game to CSKA Moscow 94-972004-2005: Euroleague: took 6th place (7-7) in Group B, then took 3rd place (2-4) in Group D of Top162005-2006:  Euroleague: took 6th place (4-10) in Group C2006-2007:  ULEB Cup: took 1st place (8-2) in Group C, lost to UNICS Kazan  in the Quarterfinals2007-2008: Euroleague: took 2nd place (10-4) in Group A, then took 1st place (4-2) in Group D of Top 16, lost to Maccabi T-A 85-92 in the Semifinals, beat Tau 97-93,OT in the 3rd place game (!!!) 2008-2009: took 2nd place (8-2) in Group B of Regular Season, took 2nd place (2-4) in Group H of Top16, lost to Panathinaikos 1-3 in the Quarterfinals 2009-2010: Euroleague: took 2nd place (8-2) in Group A of Regular Season, took 3rd place (3-3) in Group F of Top162010-2011:  Euroleague: took 1st place (8-2) in Group C of Regular Season, took 2nd place (4-2) in Group G of Top16, lost to Panathinaikos 69-77 in the Semifinals, beat Real Madrid 80-63 in the Third Place Game (!!!)2011-2012: Euroleague: took 2nd place (8-2) in Group D of Regular Season, took 1st place (4-2) in Group F of Top16, lost to Olympiacos 1-3 in the Quarterfinals (!!!)2012-2013: Euroleague: took 3rd place (5-5) in Group B of the Regular Season, took 6th place (7-7) in Group F of the Top162013-2014: Euroleague: took 5th place (3-7) in Group C of Regular Season;  Eurocup: took 3rd place (2-4) in Group K of the Second Stage
European cups achievements:
Saporta Cup Winner -2002Euroleague Final Four -2003, 04, 08, 11 ULEB Cup Quarterfinals -2007 Euroleague Quarter |
| Since 2023 |
 Until 2023 |
League positions:
| Season | Tier | Division | W-L | Position + PlayOff | European competitions |
|---|---|---|---|---|---|
| 1959-60 | 2 | Serie A | 4th | ||
| 1960-61 | 2 | Serie A | 6th | ||
| 1961-62 | 2 | Serie A | 11th | ||
| 1962-63 | 2 | Serie A | 3rd | ||
| 1963-64 | 2 | Serie A | |||
| 1964-65 | 2 | Serie A | |||
| 1965-66 | 2 | Serie B | |||
| 1966-67? | 2 | Serie B | 3rd | ||
| 1967-68 | 2 | Serie B | 7th | ||
| 1968-69 | 2 | Serie B | 8th | ||
| 1969-70 | 2 | Serie B | 6th | ||
| 1970-71? | 2 | Serie B | 3rd | ||
| 1971-72 | 2 | Serie B | 2nd | ||
| 1972-73 | 2 | Serie B | 1st  | ||
| 1973-74 | 1 | Serie A | 11-15 | 7th | |
| 1974-75 | 1 | Serie A1 | 5th | ||
| 1975-76 | 1 | Serie A1 | 8th | ||
| 1976-77 | 1 | Serie A1 | 8-14 | 9th  | |
| 1977-78? | 2 | Serie A2 | 4th | ||
| 1978-79 | 1 | Serie A1 | 14-12 | 7th, lost in Quarterfinals 1-2 to Sinudyne BO | |
| 1979-80 | 1 | Serie A1 | 11-15 | 9th | |
| 1980-81? | 1 | Serie A1 | 7-25 | 14th | |
| 1981-82 | 2 | Serie A2 | 9th | ||
| 1982-83? | 2 | Serie A2 | 6th | ||
| 1983-84 | 2 | Serie A2 | 7th | ||
| 1984-85 | 2 | Serie A2 | 9th | ||
| 1985-86? | 2 | Serie A2 | | ||
| 1986-87? | 3 | Serie B | 3rd | ||
| 1987-88 | 3 | Serie B | |||
| 1988-89? | 3 | Serie B | |||
| 1989-90 | 3 | Serie B | 1st | ||
| 1990-91 | 2 | Serie A2 | 2nd | ||
| 1991-92 | 1 | Serie A1 | 10-20 | 15th | |
| 1992-93? | 2 | Serie A2 | |||
| 1993-94? | 2 | Serie A2 | | European Cup | |
| 1994-95? | 1 | Serie A1 | 15-17 | 9th, lost in 1/8 Finals 0-2 to Teorematour RO | |
| 1995-96? | 1 | Serie A1 | 12-20 | 12th | |
| 1996-97 | 1 | Serie A1 | 12-14 | 9th, lost in 1/8 Finals 0-2 to Polti Cantu | |
| 1997-98? | 1 | Serie A1 | 13-13 | 7th, lost in Quarterfinals 0-3 to Teamsystem BO | |
| 1998-99 | 1 | Serie A1 | 9-17 | 11th, lost in 1/8 Finals 1-2 to Calze Pompea | |
| 1999-00? | 1 | Serie A1 | 15-15 | 8th, lost in Quarterfinals 0-3 to Paf Bologna | |
| 2000-01 | 1 | Serie A1 | 19-15 | 6th, lost in Quarterfinals 0-3 to Paf Bologna |  SPRL: 9th (Group A) (6-12) |
| 2001-02 | 1 | Serie A | 25-11 | 5th, lost in Quarterfinals 0-3 to Oregon Scientific Cantu |  Eurocup: 1st (Group B) (7-3)  beat Pamesa Valencia 81-71 in the Final |
| 2002-03 | 1 | Serie A | 22-12 | 4th, lost in Semifinals 1-3 to Benetton |  Euroleague: 6th (Group B) (6-8), lost in semis 62-65 to Benetton |
| 2003-04 | 1 | Serie A | 26-8 | 1st beat Skipper BO 3-0 in the Finals | Euroleague: 4th (Group B) (7-7) |
| 2004-05 | 1 | Serie A | 25-9 | 3rd, lost in Quarterfinals 1-3 to Lottomatica RO | Euroleague: 5th (Group B) (7-7) |
| 2005-06 | 1 | Serie A | 23-11 | 3rd, lost in Quarterfinals 1-3 to Lottomatica RO |  Euroleague: 6th (Group C) (4-10)  |
| 2006-07 | 1 | Serie A | 30-4 | 1st beat VidiVici Bologna 3-0 in the Finals |  Eurocup: 1st (Group C) (8-2), lost in Quarterfinals 0-2 to UNICS Kazan |
| 2007-08 | 1 | Serie A | 31-3 | 1st beat Lottomatica RO 4-1 in the Finals | Euroleague: 2nd (Group A) (10-4), lost in Semis 85-92 to Macc. Tel-Aviv |
| 2008-09 | 1 | Serie A | 29-1 | 1st beat Armani Jeans MI 4-0 in the Finals | Euroleague: 2nd (Group B) (8-2), lost in Quarterfinals 1-3 to Panathinaikos |
| 2009-10 | 1 | Serie A | 26-2 | 1st beat Armani Jeans MI 4-0 in the Finals | Euroleague: 2nd (Group A) (8-2) |
| 2010-11 | 1 | Serie A | 26-4 | 1st beat Bennet Cantu 4-1 in the Finals |  Euroleague: 1st (Group C) (8-2) |
| 2011-12 | 1 | Serie A | 24-8 | 1st beat Emporio Armani 4-1 in the Finals | Euroleague: 2nd (Group D) (8-2), lost in Quarterfinals 1-3 to Olympiacos |
| 2012-13 | 1 | Serie A | 18-12 | 5th beat Acea Virtus RO 4-1 in the Finals | Euroleague: 3rd (Group B) (5-5) |
| 2013-14? | 1 | Serie A | 20-10 | 2nd  lost in Finals 3-4 to Emporio Armani | Euroleague: 5th (Group C) (3-7) |
| 2014-15 | 3 | Serie B | 1st | ||
| 2015-16 | 2 | Serie A2 | 16-14 | 7th (Group East) | |
| 2016-17? | 2 | Serie A2 | 11th | ||
| 2017-20 | 2 | Serie A2 | 12th | ||
| 2020-21? | 4 | Serie C | 6-4 | 2nd (Toscana - Silver A) | |
| 2021-22 | 4 | Serie C | 2nd | ||
| 2022-23 | 4 | Serie C | 12-18 | 11th (Toscana - Gold) | |
| 2023-24? | 5 | Serie C | 17-3 | 1st (Toscana B) | |
| 2024-25 | 4 | Serie B Interregionale | 11-11 | 7th (Group B) | |
| 2025-26 | 4 | Serie B Interregionale | 23-5 | 2nd (Group C) |
