Cook Pasta: Bring a large pot of salted water to a boil. Add pasta and cook until al dente according to package directions. Drain and let it cool slightly.
Prepare Dressing: In a large mixing bowl, whisk together pesto and olive oil until combined.
Assemble Salad: Add the cooled pasta, cherry tomatoes, mozzarella balls, olives, and basil to the bowl. Toss gently to coat everything evenly.
Season: Add salt and pepper to taste. Adjust pesto or olive oil as desired.
Chill and Serve: Drizzle with balsamic glaze, cover, and refrigerate for at least 30 minutes before serving.