  The Heavy Photon Search experiment (HPS) at the Thomas Jefferson National
Accelerator Facility searches for electro-produced dark photons. We report
results from the 2016 Engineering Run consisting of 10608/nb of data for both
the prompt and displaced vertex searches. A search for a prompt resonance in
the $e^+e^-$ invariant mass distribution between 39 and 179 MeV showed no
evidence of dark photons above the large QED background, limiting the coupling
of {\epsilon}^2 {\geq} 10^-5, in agreement with previous searches. The search
for displaced vertices showed no evidence of excess signal over background in
the masses between 60 and 150 MeV, but had insufficient luminosity to limit
canonical heavy photon production. This is the first displaced vertex search
result published by HPS. HPS has taken high-luminosity data runs in 2019 and
2021 that will explore new dark photon phase space.
