Form 485BXT effective date extensions

Post-effective amendments under Rule 485(b)(1)(iii) that only designate a new effective date for a pending fund registration amendment.

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36Kfilings on EDGAR

1996first filed

4,600filed in 2026

2026-10-13latest filing

curl -H "Authorization: Bearer $SECFEED_KEY" \
  "https://secfeedapi.com/v1/filings?query=formType:%22485BXT%22&size=2"

import os, requests

r = requests.get(
    "https://secfeedapi.com/v1/filings",
    params={'query': 'formType:"485BXT"', 'size': '2'},
    headers={"Authorization": f"Bearer {os.environ['SECFEED_KEY']}"},
)
print(r.json())

What is 485BXT?

A 485BXT is a post-effective amendment filed under Securities Act Rule 485(b)(1)(iii) for the sole purpose of designating a new effective date for a previously filed post-effective amendment, usually a 485APOS that is still under SEC review.

Funds file them in batches when a new series or share class needs more time before launch, so a run of 485BXT filings is a useful signal that a fund launch has been pushed back.

Who files

Registered open-end funds and other registrants that use Rule 485 for post-effective amendments.

When it is filed

Before the scheduled effective date of the earlier amendment, each time the date needs to move.

Filings per year

Every 485BXT filing on EDGAR, counted from the SecFeed index. Updated daily.

What is inside

Section	Contents
Cover page	Registrant, file numbers and the new effective date.
Referenced amendment	The earlier post-effective amendment whose effectiveness is delayed.
Series and classes	The series and share classes covered.

Get 485BXT data with SecFeed

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Latest 485BXT filings

Company	Form	Filed
Columbia ETF Trust I	`485BXT`	2026-10-13	EDGAR ↗
Tidal Trust V	`485BXT`	2026-10-13	EDGAR ↗
GUINNESS ATKINSON FUNDS	`485BXT`	2026-10-09	EDGAR ↗
GUINNESS ATKINSON FUNDS	`485BXT`	2026-10-09	EDGAR ↗
SUNAMERICA SERIES TRUST	`485BXT`	2026-10-09	EDGAR ↗
GUGGENHEIM FUNDS TRUST	`485BXT`	2026-10-09	EDGAR ↗
GUGGENHEIM FUNDS TRUST	`485BXT`	2026-10-09	EDGAR ↗
VANGUARD MALVERN FUNDS	`485BXT`	2026-10-09	EDGAR ↗

Use cases

Track delayed fund and ETF launches
Follow a fund registration from 485APOS to effectiveness

Related forms

485APOSFund amendment pending review

485APOS post-effective amendments to fund registration statements under Rule 485(a): new series and material changes reviewed before effectiveness.

485BPOSFund amendment effective on filing

485BPOS post-effective amendments under Rule 485(b): annual fund prospectus updates and non-material changes, effective on filing.

497Fund prospectus update

Rule 497 definitive prospectuses, SAIs and supplements of mutual funds, ETFs and closed-end funds, the documents actually sent to investors.

FAQ

What is the difference between 485BXT and 485BPOS?

485BPOS makes amendments effective immediately under Rule 485(b). 485BXT only sets a new effective date for an earlier amendment.

Why do some funds file many 485BXTs?

Each one pushes back the effective date, often every 30 days, while a new fund awaits launch.

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