Sixteen Thirty’s 2024 Schedule B lists 218 substantial contributors by amount but not public identity

Sixteen Thirty Fund’s own 2024 public Form 990 Schedule B provides a direct measure of contributor concentration while leaving contributor identities unavailable in the public record. The Schedule B lists 218 substantial contributors by numbered entry and contribution amount. The six largest entries are $58,932,923, $51,375,000, $29,175,000, $22,000,000, $10,000,000 and $8,408,566, totaling $179,891,489. The public contributor-name/address fields are blank. Current IRS Schedule B instructions explain that organizations other than 501(c)(3)s and section 527 political organizations are no longer required to report substantial contributors’ names and addresses annually on Schedule B; they must still report contribution amounts and retain the identities in their records for IRS request. Sixteen Thirty is a 501(c)(4). Some anonymous-by-form amounts can be independently matched to legal grantmakers through the grantmakers’ own filings—for example New Venture Fund’s primary/IRS-derived FY2024 grant to Sixteen Thirty is $58,932,923, exactly matching contributor entry #1, and Future Forward USA Action’s reported 2024 grants total $29.175M, matching entry #3. Other Schedule-B amounts should remain unidentified unless an independent grantmaker filing or equivalent record matches them. The correct conclusion is therefore that Sixteen Thirty’s public filing discloses the scale and concentration of substantial contributions but not the contributor identities, and independent cross-filing reconstruction can identify some but not necessarily all of them. This reporting structure is lawful under current federal rules and is not evidence by itself of illegality, foreign funding, straw donors, or prohibited election activity.