If your portfolio is in trouble, maybe you can hire the A-Team. The elite IBD 50 list has a surprising number of companies that start with the letter A. The five best — Aruba Networks (ARUN), Acme Packet (APKT), Amerigroup (AGP), Altera (ALTR) and ARM Holdings (ARMH) — all are in the top 20. 1. Aruba Networks The company’s products help workers securely link to networks via wireless connections. Cisco (CSCO) is its top rival, but Aruba is the largest pure play in its niche.