FINRA Rule 4330 sets the conditions a broker-dealer must meet before it can borrow fully paid or excess margin securities from a retail customer. Before your firm touches a single share in a fully paid lending program, it has to obtain your written authorization, determine that lending is appropriate for your situation, give you specific written disclosures about the risks, and back the loan with collateral that gets marked to market every business day. The rule applies to fully paid securities in a cash account and to the portion of margin holdings that exceeds 140 percent of your debit balance.
Which of Your Securities the Rule Reaches
Two categories fall under Rule 4330. “Fully paid” securities are shares you own outright, with no remaining purchase debt, in a cash or margin account. “Excess margin” securities are the slice of your margin holdings whose value exceeds 140 percent of what you owe on margin. Your brokerage has no automatic right to lend either category, which is what distinguishes them from securities pledged as margin collateral.
The transaction itself is a loan with you as the lender and your brokerage as the borrower. The firm typically re-lends your shares to institutional short sellers or uses them for other trading purposes, pays you a lending fee, and posts collateral. Rule 4330 exists because that arrangement shifts real risks onto individual investors who may not understand what they are giving up.
Written Authorization and the 30-Day FINRA Notice
Your firm cannot borrow your securities until you agree in writing. For securities held on margin, Rule 4330(a) prohibits lending without prior written authorization. For fully paid and excess margin securities, SEC Rule 15c3-3 requires a separate written agreement that spells out the compensation terms, lists which securities are being borrowed, and describes each party’s rights and obligations.
Firms must also notify FINRA at least 30 days before launching or participating in a fully paid lending program for the first time. The notification gives regulators advance visibility and a chance to flag concerns before customers are enrolled. Individual brokerages can add their own eligibility rules on top of the regulatory baseline. Fidelity, for example, requires at least $25,000 in each brokerage account enrolled in its lending program.
The Appropriateness Determination
Enrollment is not open-door. Rule 4330(b)(2)(A) requires the firm to have “reasonable grounds for believing that the customer’s loan of securities is appropriate for the customer” before it borrows any shares. FINRA deliberately uses “appropriate” rather than “suitable,” and it has made clear that firms recommending a lending program to retail customers must also comply with Regulation Best Interest.
To reach that appropriateness conclusion, the firm has to look at your financial situation, tax status, investment objectives, time horizon, liquidity needs, and risk tolerance. Tax status carries unusual weight in this analysis because lending income is often taxed at a higher rate than ordinary dividends. If you sit in a high tax bracket and hold dividend-paying stocks, the math may not work in your favor. Time horizon matters too: someone planning to sell soon faces a different recall picture than a long-term holder.
The firm must document how it reached its conclusion, and the obligation is not a one-time check. If your circumstances change materially, the firm should reassess whether lending still fits.
Disclosures the Firm Must Deliver
Before borrowing your securities for the first time, the firm must give you a written disclosure covering the specific risks of the arrangement. Four points carry the most weight.
- SIPC coverage may not protect you with respect to securities you have lent out. If your broker-dealer fails, the collateral posted to your account could be your only recovery. That is a fundamentally different risk profile from simply holding shares.
- You cannot vote shares while they are on loan. The borrower, or whoever ends up holding the shares, gets that right. If a proxy vote matters to you, you would need to recall your shares first.
- Dividends paid while your shares are on loan reach you as “substitute payments” or “payments in lieu of dividends,” not as actual dividends, and the tax treatment differs.
- The written agreement must include the basis for calculating your lending fee, the rights and obligations of both parties, and a schedule identifying which securities are being borrowed.
Regulation Best Interest adds a conflicts layer on top. Your firm has a built-in incentive to borrow cheaply and re-lend at a higher rate; the spread is how it profits. Disclosure alone does not satisfy Reg BI. The firm must also maintain policies to manage or eliminate conflicts that could push recommendations away from your best interest.
Why Substitute Payments Sting
A qualified dividend is taxed federally at a maximum of 20 percent, plus the 3.8 percent net investment income tax for high earners. A substitute payment is taxed as ordinary income, with the top federal rate at 37 percent for 2026. On a large dividend-paying position, that gap adds up. Some brokerages offer an annual credit to partially offset the difference, but not every firm does, and credits do not always make you whole. This is why Rule 4330 lists tax status among the factors the firm must weigh when deciding whether lending is appropriate for you.
Collateral and Daily Mark-to-Market
SEC Rule 15c3-3(b)(3) sets the collateral protections behind every loan of your securities. The borrowing firm must post collateral that fully secures the loan no later than the close of business on the day it borrows the shares. Acceptable collateral is limited to cash, U.S. Treasury bills and notes, irrevocable bank letters of credit, and certain other government-related securities the SEC has approved by order.
The firm must mark every loan to market at least once per business day. If the market value of your loaned securities rises above 100 percent of the collateral posted, the firm must deliver additional collateral by the close of the next business day. That daily recalculation is your primary protection if the firm becomes insolvent while holding your shares. Because SIPC protections may not apply to the loaned securities, the collateral in your account may be all you recover. The written agreement required under Rule 15c3-3(b)(3) must include a prominent notice stating that the collateral “may constitute the only source of satisfaction of the member’s obligation” if the firm does not return your shares.
How You Get Paid
Your lending fee is generally the product of a loan rate and the market value of the securities on loan. The fee accrues daily and is typically credited to your account monthly. The rate depends almost entirely on how badly someone else wants to borrow that specific security.
Hard-to-borrow stocks with heavy short interest can command much higher lending rates than widely held blue chips. Rates fluctuate with borrowing demand, lendable supply, short-selling activity, and market conditions. Most retail investors earn modest returns from lending mainstream stocks; the meaningful money sits in shares that short sellers are struggling to find. If your broker is borrowing your shares and paying you nothing for them, that is a signal the arrangement is not working as Rule 4330 contemplates.
Selling or Recalling Loaned Shares
You can sell shares that are currently on loan without waiting for them to come back. Under Regulation SHO, when you sell, the firm must initiate a recall promptly enough that the shares are in its possession or control by the settlement date. The mechanics have tightened since the T+1 settlement cycle took effect in May 2024. As a practical matter, most brokerages handle the recall automatically when you place a sell order, and you generally will not experience a delay. Extremely hard-to-borrow securities are the exception where friction can appear, which is one reason Rule 4330’s appropriateness analysis includes liquidity needs.
You also generally keep the right to recall loaned shares at any time, even if you are not selling. Pulling shares back to vote a proxy is a common example. The written agreement should describe the recall process and timeline.
What Enforcement Looks Like in Practice
FINRA brought its first enforcement action under Rule 4330 in February 2025, fining Apex Clearing Corporation $3.2 million for conduct spanning January 2019 through June 2023. The case reads as a working checklist of what the rule actually requires.
FINRA found that Apex borrowed shares from customers who received no lending fee at all, and concluded the firm could not have had reasonable grounds to believe those arrangements were appropriate. From March 2021 through April 2023, the firm failed to give many enrolled customers the required written disclosures. Documents distributed through introducing broker-dealers told more than five million retail investors they would receive compensation for lending their shares; they did not. And the firm never established, maintained, or enforced a supervisory system reasonably designed to ensure Rule 4330 compliance. FINRA also charged violations of rules on communications with the public, supervision, and commercial honor.
The signal for retail investors is straightforward. If you are enrolled in a fully paid lending program, you should be able to point to a written agreement, a set of risk disclosures, and lending fees actually credited to your account. If any of those pieces is missing, the program is not being run the way Rule 4330 requires.