Okay. Neither Twitter nor Square is lighting up Wall Street. So it may seem odd to put Jack Dorsey in a list with CEOs whose stocks have done well in 2015.

Twitter (TWTR) shares have tanked this year, sliding even further after co-founder Dorsey officially took over in October.

And Dorsey's mobile payment firm Square (SQ) gave unicorns a bad name when it went public in November at a steep discount to what it was valued at in its last private round of financing.

Related: Twitter must go mainstream

But he's running two companies. That's not easy to do.

Say what you want about what Dorsey can be doing better at Twitter and Square. I'm just amazed he can find the time to sleep when he's got two public firms to manage.

So let's give him some credit -- for sheer ambition if nothing else.