The logo should contain an elegantly stylized ark, representing stability, security, and a trustworthy vessel for investments. Could possibly surround the ark with gentle waves or incorporate a harbor element to convey a sense of safety and protection. Use a clean and professional font for the company name "Ark Harbor" underneath or beside the ark.
If you use fonts that require a license, confirm with the client they're ok with it. For licensing reasons, it is better to provide your client with information on how to acquire the font rather than providing the actual files.