ANAPTYSBIO, INC 8-K

What Happened AnaptysBio, Inc. announced on May 29, 2026 that it filed IRS Form 8937 and will post the Form 8937 information on the “Investors” section of its website (www.anaptysbio.com). The Form 8937 provides details about the dividend paid to AnaptysBio stockholders consisting of First Tracks Biotherapeutics, Inc. common stock following the separation and spin-off of First Tracks. The filing explains how the distribution is treated for tax purposes and describes how stockholders’ tax basis in their holdings is adjusted.

Key Details

• The Company filed Form 8937 with the IRS and will publish the same information on its investor website.
• The distribution to stockholders was a dividend of First Tracks common stock resulting from the separation/spin-off.
• Form 8937 explains how the dividend is treated and how the change in tax basis is determined.
• AnaptysBio states the information is for informational purposes only and is not legal or tax advice; stockholders are urged to consult their own tax advisors (including state, local and non-U.S. tax issues).

Why It Matters This filing gives shareholders formal IRS-related documentation and guidance about the tax treatment of the First Tracks spin-off distribution and changes to tax basis. For investors, the Form 8937 is a primary source to help determine potential tax reporting obligations resulting from the spin-off; shareholders should review the posted form and consult a tax advisor to understand their specific tax consequences.