X0101 EFFECT 33 LIVE 2014-09-25 16:30:00

N-1A

0001562565 Fidelity Merrimack Street Trust 333-186372 S000040431 Fidelity Corporate Bond ETF C000125598 Fidelity Corporate Bond ETF S000042567 Fidelity Total Bond ETF C000131659 Fidelity Total Bond ETF S000042569 Fidelity Limited Term Bond ETF C000131661 Fidelity Limited Term Bond ETF