Form 485BXT Filings

What Is SEC Form 485BXT?

SEC Form 485BXT is a post-effective amendment filing used by registered investment companies on SEC Form N-1A to designate a new effective date for a previously filed post-effective amendment under Securities Act Rule 485(a), pursuant to Rule 485(b)(1)(iii). It is typically submitted when a fund needs to delay or reset the automatic effectiveness of an earlier amendment while incorporating the underlying prospectus and SAI by reference. The filing becomes effective on the date specified in the amendment.

Key elements typically found in SEC Form 485BXT include:

• Name of the registrant and file number
• Series and class information covered by the amendment
• Statement that the filing is made pursuant to Rule 485(b)(1)(iii)
• Identification of the prior post-effective amendment being delayed or re-dated
• The newly designated effective date
• Signatures and authorization details

SEC Form 485BXT Filing Deadlines

SEC Form 485BXT is an event-driven filing and has no fixed statutory deadline. Timing is generally determined by when the registrant needs to designate a new effective date for a previously filed post-effective amendment.

Key Things to Know About Form 485BXT Filing Rules

• Rule 485(b)(1)(iii) Purpose:
  Form 485BXT is used specifically to designate a new effective date for a previously filed post-effective amendment, rather than to introduce new prospectus content as a primary objective.
• Event-Driven Timing:
  The filing is made when a registrant needs to delay or re-date the effectiveness of an earlier amendment, so the timing is based on the registrant’s effective date planning.
• Incorporation by Reference:
  Form 485BXT filings commonly incorporate Parts A, B, and C of the previously filed amendment by reference, rather than restating the full disclosure.
• Applies to Form N-1A Registrants:
  This form type is generally associated with open-end funds and ETFs that register and update offerings through Form N-1A.
• EDGAR Form Type Tracking:
  Market participants often monitor these filings to confirm when a fund’s underlying post-effective amendment will become effective and to track any changes to the effective date.

To track investment company post‑effective amendments and effective date designations, our platform helps you monitor filings such as Form 485BXT, Form 485BPOS, and  Form 485APOS, keeping you informed about fund registration updates and disclosure compliance. This form can be retrieved through the SEC’s EDGAR system. For a step-by-step walkthrough, see the process of accessing SEC filings via EDGAR