What Securities Are Not Marginable?
Having a margin-enabled account doesn’t mean every security in it can actually be bought on margin or counted as collateral. A meaningful slice of the market falls outside what brokers are willing to lend against.
The short answer
Non-marginable securities are those a broker won’t extend margin credit to purchase, and often won’t count toward the collateral value that supports other margin borrowing either. Common categories include very low-priced stocks, thinly traded or newly listed securities, and certain other instruments a broker considers too volatile or illiquid to lend against safely. The specific list varies by broker and can change without much warning.
Why some securities get excluded
Margin lending works because the broker holds the securities as collateral against the loan, and can sell them relatively quickly if needed to cover the balance. That model breaks down for securities that are hard to sell quickly at a stable price. A stock trading a handful of shares a day, or one whose price can swing dramatically on light volume, doesn’t make reliable collateral, so brokers exclude it rather than risk being unable to liquidate it at a fair price during a shortfall.
Common categories to know
- Low-priced stocks. Securities trading below a certain per-share price threshold are frequently excluded, since low-priced shares tend to be more volatile relative to their price.
- Thinly traded or newly listed securities. Limited trading volume makes it harder for a broker to sell a large position without significantly moving the price.
- Certain over-the-counter securities. Securities not listed on a major exchange are more often restricted, reflecting generally lower liquidity and less price transparency.
- Some newly issued shares. Recently listed securities sometimes carry a waiting period before a broker will treat them as marginable.
It’s a broker decision, not just a market rule
While there are broad regulatory floors on what can be marginable, individual brokers are generally free to be more restrictive than the minimum, and many are. One firm might treat a given security as fully marginable while another excludes it entirely, and a broker can also change a security’s marginability status at any time, including tightening it during a period of unusual volatility. That means the marginability of a specific holding is worth checking directly with the broker rather than assuming based on general rules.
What happens if a holding isn’t marginable
A non-marginable security generally must be paid for in full with available cash, the same as in a cash account, even inside an account that otherwise permits margin trading. It also typically won’t be counted when calculating how much buying power is available for other purchases, since it isn’t contributing collateral value. Holding a portfolio with a mix of marginable and non-marginable securities means the effective borrowing capacity is smaller than the account’s total value might suggest.
Why this matters beyond a single trade
Someone who assumes their entire portfolio counts as collateral, and then discovers a chunk of it doesn’t, can end up with materially less buying power than expected — or find that a margin call deficiency is calculated differently than they assumed, since non-marginable positions don’t help satisfy the requirement. It’s a detail that’s easy to overlook until it directly affects what can be purchased or what’s needed to meet a maintenance requirement.
What to weigh
Before assuming a security adds to margin buying power, it’s worth confirming its marginable status directly, since the classification can differ by broker and can shift with market conditions. Treating marginability as a fixed, universal fact rather than a broker-specific, changeable classification is a common source of surprise for anyone managing a mixed portfolio in a margin account.