Typically financial disclosures, such as the ones covered by OGE Form 450 (Confidential Financial Disclosure Report), are not public information and are exempted from FOIA requests
The form in question isn't the 450, which is confidential (hence its name). It's form 278, "Public Financial Disclosure", which is public (hence its name.
Public Financial Disclosure
The Ethics in Government Act of 1978, as amended, requires senior officials in the executive, legislative and judicial branches to file public reports of their finances as well as other interests outside the Government. The statute and the U.S. Office of Government Ethics's (OGE) regulations specify which officials in the executive branch file an OGE Form 278. Unlike confidential financial statements filed by some mid-level employees, the OGE 278 is available to the public. Reviewing officials within each agency certify and maintain these reports. Agencies do, however, forward reports of Presidential appointees confirmed by the Senate and certain other reports to OGE for additional review and certification.