From a press release issued by Aprilia Racing:

100 victories for Aprilia in 250 world championship racing

APRILIA celebrated another milestone today in Brno, the famous Italian manufacturer claiming a 100th victory in the world 250 championship. Argentina’s Sebastian Porto had the honour of notching up the century of victories for Aprilia in the Czech Republic GP, the first of which was won by Loris Reggiani back in 1987 at the Misano circuit. A distinguished list of riders have won 250 races for Aprilia, including Valentino Rossi, Max Biaggi, Marco Melandri and Manuel Poggiali, all who went onto win the world championship riding for the Noale manufacturer.

Aprilia’s 100 victories have been shared between 17 riders :

23 Max Biaggi
14 Valentino Rossi
11 Tetsuya Harada
10 Marco Melandri
6 Toni Elias
5 Fonsi Nieto, Manuel Poggiali, Loris Reggiani
4 P.F. Chili, Randy De Puniet
3 J.P. Ruggia, Sebastian Porto
2 Loris Capirossi, , Ralf Waldmann
1 Marcellino Lucchi, Jeremy McWilliams, Anthony West

History of Aprilia’s 100 250 wins:

1987: 1 – Reggiani (Misano)

1991: 2 – Chili (Assen), Reggiani (Le Castellet)

1992: 6 – Reggiani (Jerez), Chili (Hockenheim, Assen), Reggiani (Magny Cours), Chili (Donington), Biaggi (Kyalami).

1993: 3 – Ruggia (Donington), Reggiani (Brno), Ruggia (Misano).

1994: 6 – Biaggi (Eastern Creek, Shah Alam), Ruggia (Jerez), Biaggi (Assen, Brno, Barcellona).

1995: 8 – Biaggi (Shah Alam, Nürburgring, Mugello, Assen, Donington, Brno, Buenos Aires, Barcellona).

1996: 9 – Biaggi (Shah Alam, Suzuka, Jerez, Mugello, Le Castellet, Donington, Brno, Barcellona, Eastern Creek).

1997: 3 – Harada (Le Castellet, Assen, Nürburgring).

1998: 13- Harada (Johor), Capirossi (Jerez), Lucchi (Mugello), Harada (Le Castellet, Jarama), Rossi (Assen), Capirossi (Donington), Harada (Sachsenring, Brno), Rossi (Imola, Barcellona, Phillip Island, Buenos Aires).

1999: 9 – Rossi (Jerez, Mugello, Barcellona, Donington, Sachsenring, Brno, Phillip Island, Welkom, Rio de Janeiro).

2000: 2 – Waldmann (Jerez, Donington).

2001: 2 – Harada (Mugello) , 1 – McWilliams (Assen) , 1 – Melandri (Sachsenring).

2002: 9 – Melandri (Welkom, Mugello, Montmelò, Assen, Donington, Sachsenring, Brno, Phillip Island, Valencia) 4 – F.Nieto (Jerez, Le Mans, Estoril, Sepang) , 1 – Elias (Motegi).

2003: 4 – Poggiali (Suzuka, Welkom, Mugello, Rio) , 5 – Elias (Jerez, Le Mans, Estoril, Motegi, Sepang) , 1 – Puniet (Montmelò), 1 – West (Assen) , 1 – Nieto (Donington), 2 – De Puniet (Brno, Valencia).

2004: 3 – Porto (Mugello, Assen, Brno), 1 – De Puniet (Montmelò), 1 – Poggiali (Rio)