RedactedNarrative: Operator stated he and his friends were headed out for a sunset cruise.  There were 7 persons on board (capacity plate was 5) .  A large vessel went by in the opposite direction sending a wake over his bow.  The volume of water from the wake caused the vessel to swamp.  Still under power the gunnel was just above the water he slowly powered towards a moored sailboat in the vicinity.  The volume of the water caused the vessel to swamp.  Movement of persons onboard caused the swamp boat to capsize with all persons going into the water.  Occupants were rescued a homeowner who heard the noise and made 2 trips to take the persons to shore.  No persons were wearing PFD's and the vessel was not equipped with a kill switch.  Overloading cause of the accident.