Yes but in November 2015, it had no competition and won almost all three regions with ease. Its grip has slipped mightily since then. If you aligned sales between Switch and PS4 since Switch launched and looked at marketshare it's a vast slide for Sony compared to Wii U and PS4. So it's "peak" as far as year-to-year marketshare is far, far over.
So its grip slipped mightily despite probably having its best November?