The Core Difference

Both frameworks ask the same underlying question — how quickly can this portfolio be converted to cash? — but they were built to solve different problems. Public fund rules are calibrated to a hard statutory deadline for retail investors. Private fund rules are calibrated to the actual redemption terms that sophisticated investors negotiate.

Public Funds — Rule 22e-4

The SEC adopted the Liquidity Risk Management Program rule (Rule 22e-4) in 2016, applying to all open-end registered investment companies — mutual funds, ETFs, and money market funds. The rule requires every portfolio holding to be classified into one of four buckets:

Why 7 Days?

The ceiling is not arbitrary. Section 22(e) of the Investment Company Act of 1940 legally requires open-end funds to pay redemption proceeds to investors within 7 calendar days of a redemption request. The SEC built the classification framework backward from that statutory obligation — if the fund cannot liquidate a holding fast enough to meet the 7-day deadline, it is, by definition, illiquid under the rule.

Retail investors in mutual funds can redeem daily. Every dollar invested is, implicitly, a demand deposit with a 7-day settlement backstop. The liquidity ladder exists to ensure the fund can always honour that promise.

The Highly Liquid Investment Minimum (HLIM)

Rule 22e-4 also requires each fund to set a minimum percentage of assets that must remain in the "Highly Liquid" bucket. This acts as a standing buffer — analogous to a reserve requirement — so a surge in redemptions does not force the fund to sell less-liquid assets at distressed prices.

Private Funds — Form PF

Form PF was mandated by Dodd-Frank (2010) and adopted by the SEC in 2011. It applies to SEC-registered investment advisers that manage private funds — hedge funds, private equity funds, liquidity funds, and other vehicles. The liquidity buckets used in Form PF are far more granular and extend well beyond 7 days:

Why Longer Windows?

Three structural differences explain the longer time horizon:

1. No statutory redemption deadline. Private funds are not subject to the Investment Company Act of 1940. Their governing documents — limited partnership agreements, subscription agreements — typically allow 30–90+ day notice periods, quarterly redemption windows, multi-year lock-up periods, and side-pocket mechanisms for illiquid assets. The regulator builds the measurement tool to fit the actual legal structure of the fund.

2. Different asset types. Hedge funds hold distressed debt, CLO tranches, private loans, and commodity positions where meaningful price discovery takes weeks or months. Private equity funds hold direct company stakes that may take years to exit. A 7-day outer boundary would classify almost all of these assets as "illiquid" and produce no useful differentiation for risk monitoring.

3. Systemic risk surveillance, not investor protection. Form PF was designed to give FSOC (Financial Stability Oversight Council) and the SEC aggregate visibility into the private fund sector after the 2008 crisis. The question it answers is: if credit markets seize up, how quickly could forced deleveraging by private funds ripple through the system? Granular longer-dated buckets let regulators model that stress scenario in aggregate — they are not checking whether individual investors can get their money back this week.

Side-by-Side Comparison

The Underlying Logic

Both frameworks ask managers to think carefully about the liquidity profile of their portfolios — but they measure against different clocks, because they serve different masters.