X0101 EFFECT 33 LIVE 2018-11-20 16:00:00

S-4

0001723089 Apergy Corp 333-228389 0001757712 Accelerated Process Systems, Inc. 333-228389-20 0001757802 Windrock, Inc. 333-228389-19 0001757784 Norriseal-Wellmark, Inc. 333-228389-18 0001757803 Wellmark Holdings, Inc. 333-228389-17 0001757974 US Synthetic Corp 333-228389-16 0001757716 UPCO, Inc. 333-228389-15 0001757793 Theta Oilfield Services, Inc. 333-228389-14 0001757701 Spirit Global Energy Solutions, Inc. 333-228389-13 0001757700 Quartzdyne, Inc. 333-228389-12 0001757756 PCS Ferguson, Inc. 333-228389-11 0001757787 Norris Rods, Inc. 333-228389-10 0001757798 Honetreat Co 333-228389-09 0001757801 Harbison-Fischer, Inc. 333-228389-08 0001757746 Apergy USA, Inc. 333-228389-07 0001757748 Apergy Funding Corp 333-228389-06 0001757749 Apergy ESP Systems, LLC 333-228389-05 0001757659 Apergy Energy Automation, LLC 333-228389-04 0001757751 Apergy BMCS Acquisition Corp 333-228389-03 0001757736 Apergy Artificial Lift, LLC 333-228389-02 0001757750 Apergy (Delaware) Formation, Inc. 333-228389-01