This was the longest stage, with a course over 194km from Ambert to Le Teil, and set up for strong sprinters.
It proved the case in a very tight finish, with the German Arndt managing to sneak over the line by centimetres.
Chris Froome of Team Sky had won the first two stages and retains the yellow jersey, with Alberto Contador in second.
Third stage - results
1. Nikias Arndt (Giant-Shimano) 2. Kris Boeckmans (Lotto-Belisol) 3. Reinhardt Janse van Rensburg (Giant-Shimano) 4. Yannick Martinez (Europcar) 5. Davide Cimolai (Lampre-Merida)
- Sports & Recreation
- Chris Froome
- Nikias Arndt
- Alberto Contador
- Kris Boeckmans