A holder for a concrete anchor to be embedded in concrete, comprises base portion; a first sleeve portion vertically disposed above the base portion; post portions including vertical openings, the post portions including respective top edges for providing a shoulder to engage the nail heads when the nails are installed in the vertical openings. A concrete anchor assembly for being embedded in concrete, the assembly including the holder; and an anchor body held by the holder, the anchor body including a rod portion and a head portion.