His stint in charge has been beaten among current bosses only by Christian Horner, who started at Red Bull a year earlier, and while the Italian outfit hasn't matched the sister team in terms of results, that was never the intention.
Its focus has always been to train young drivers, and as such it helped to create two world champions for Red Bull in the form of Sebastian Vettel and Max Verstappen. Other graduates have either established themselves in F1 or moved on and found consistent success in Formula E or WEC.
The Italian GP wins achieved by Vettel in 2008 and Pierre Gasly 12 years later are the obvious standouts in statistical terms.
However, Tost himself prefers to consider the bigger picture rather than individual results, having succeeded in creating a strong organisation on the bare foundations of the former Minardi team.
"When Dietrich Mateschitz called me and said you go now to Italy," he says when asked about the highlights. "And when I came there and saw how it looked like, because I couldn't believe that this is the infrastructure for an F1 team! And then to build the team up.
"You know, it was not one highlight. It was a fantastic time to build together with the team, Scuderia AlphaTauri, and in the beginning, Toro Rosso. And I must say in Italy, especially Emilia Romagna and Faenza, it is a fantastic area.
"You have really good people there, you have enthusiastic people there. They have passion for F1, they like to work. And it was a real pleasure to build everything up together with these people.
"And it's not one highlight, of course You will see now someone can say the two wins in Monza were good. No, it's generally everything. And then also to see that the team worked successfully.
Source: Autosport