 Early investors included Claus Spreckels, Samuel Parker, and Theophilus Harris Davies.The Hāmākua Mill Company, Honokaa Sugar, Kaiwiki Sugar, Kukaiau Plantation Company, Laupāhoehoe Sugar, Paauhau Sugar Plantation and Pacific Sugar Mill were eventually consolidated into the Hāmākua Sugar Company.The Hāmākua district was an endemic region of bubonic plague in the early part of the 20th century.