A stock loan and a margin loan both let you raise money against shares, but they are built for opposite situations. A stock loan is financing secured by pledging shares you already own — often a concentrated founder or major-shareholder position — to draw cash for a purpose that may have nothing to do with the market. A margin loan is brokerage credit extended within a trading account, primarily to buy more securities against a diversified portfolio. They differ in purpose, in the collateral they accept, in how much single-name concentration they tolerate, in who lends, and in how recourse and margin calls behave. For a founder or controlling shareholder sitting on a single large SET holding, that last point is usually decisive: a stock loan is designed for concentration, while a margin account is designed to penalise it.
Key takeaways
- Different jobs. A stock loan finances a position you already hold; a margin loan funds buying more securities.
- Concentration is the dividing line. A stock loan is built for a single large holding; a margin account typically penalises or refuses one.
- Different lenders. Stock loans are arranged privately and structured to the position; margin is standardised brokerage credit.
- Margin behaviour differs. Margin accounts mark to market daily and issue margin calls; a stock loan is structured around agreed terms set up front.
- Right tool, right shareholder. Founders and major holders usually need a stock loan; active traders use margin.
What each instrument actually is
A stock loan
A stock loan is bilateral financing secured by a pledge of listed shares the borrower already owns. The shareholder pledges SET- or mai-listed shares as collateral, the lender advances a percentage of their value, and the borrower receives cash to use however they choose — an unrelated investment, a property purchase, a business need, a generational transition. The shares remain beneficially the borrower's, staying in the borrower's own account at a designated custodian and held in book-entry form at the Thailand Securities Depository (TSD) — with the lender's security arising from its rights and control over that account — for the life of the loan, and the full position returns on repayment. For the foundational definition, see what a Thailand stock loan is. The defining feature is that the loan is built around a specific holding, including a concentrated one.
A margin loan
A margin loan is credit extended by a broker inside a margin trading account, secured by the marginable securities held in that account. Its classic purpose is leverage: borrowing against an existing portfolio to buy additional securities, amplifying both gains and losses. Margin is standardised — the broker applies set margin rates, daily mark-to-market, and maintenance requirements across the account as a whole. It is an excellent tool for an active investor running a diversified book. It is a poor fit for someone whose wealth sits in one large stake, because the account framework treats a single concentrated name as a risk to be limited rather than a position to be financed.
The differences that matter
Purpose
A stock loan is about extracting liquidity from a position you intend to keep. A margin loan is about adding exposure — putting more capital to work in the market. One looks outward from the holding; the other doubles down inside the account.
Collateral and concentration tolerance
This is the heart of the matter. A margin account is built on diversification: brokers apply concentration limits, haircut single large positions heavily, and may refuse to lend meaningfully against one stock that dominates an account. A stock loan does the reverse. It is structured specifically for a single concentrated name — the founder's stake, the family's controlling block — and the whole arrangement is sized to that one position rather than penalising it. A holding that a margin desk would treat as an unacceptable concentration is, for a stock loan, simply the collateral.
Who lends
Margin is a standardised brokerage product, offered on largely fixed terms to account holders. A stock loan is arranged privately and negotiated to the specific position — the ticker, its liquidity, the size, the borrower's objective, and the relevant disclosure picture all shape the structure. That bespoke nature is what lets a stock loan accommodate situations a standardised product cannot.
Recourse and margin behaviour
A margin account marks to market every day. If the value of the marginable securities falls below the maintenance requirement, the broker issues a margin call, and unmet calls can lead to forced liquidation at the worst possible moment. A stock loan is structured around terms agreed up front, with the parameters — loan-to-value, the buffer, what happens if the price moves — set out at the start rather than reassessed continuously against a standard account formula. Stock loans can also be structured on different recourse profiles, which materially changes what is at risk if the collateral falls in value; we explore that in recourse vs. non-recourse stock loans in Thailand.
Typical user
A margin loan suits an active trader or investor running a diversified portfolio who wants leverage. A stock loan suits a founder, controlling family, or long-term major shareholder who holds one substantial Thai-listed position and needs capital without selling it.
| Stock loan | Margin loan | |
|---|---|---|
| Purpose | Raise cash against a position you keep | Borrow to buy more securities |
| Collateral | A specific pledged shareholding | Marginable securities in the account |
| Concentration tolerance | Built for single-name concentration | Penalises or limits concentration |
| Who lends | Privately arranged, structured to the position | Broker, standardised terms |
| Recourse / margin behaviour | Terms agreed up front; recourse profile structured | Daily mark-to-market; margin calls |
| Typical user | Founder, family, major shareholder | Active, diversified investor |
When each suits a Thai shareholder
The choice is rarely about which is "better" in the abstract — it is about which fits the situation. If you actively trade a diversified portfolio and want leverage to take on more positions, margin is the natural instrument, and your broker already offers it. If your wealth is concentrated in a single SET- or mai-listed company you helped build, and you need liquidity for something else while keeping that holding intact, a margin account is the wrong shape entirely: it will either decline the concentration or impose terms that make the single-name risk your problem to manage daily. A stock loan exists precisely for that case.
The most common reason founders come to us is that they have already discovered this. A margin desk has told them their position is too concentrated to lend against in size, or has offered a haircut so steep it defeats the purpose. The concentration that disqualifies them from margin is exactly what a stock loan is designed to finance. To see how the amount you can draw is then sized, read how much you can borrow against Thai shares.
How Thailand Stock Loans helps
We are a Bangkok platform built specifically for financing secured by Thai-listed equity, and concentrated single-name positions are our core competence rather than an exception. When you bring us a holding, a principal reviews the specific ticker, sizes an indicative loan against it, maps any disclosure considerations, and sets the terms up front so there are no daily surprises. Our process runs from confidential enquiry to funding with a single principal throughout. If a stock loan is the right tool for your position, it will fit it far better than a margin account ever could.
This article is general information about share-backed financing in Thailand and is not legal, tax, or financial advice. The right instrument depends on your specific holding, objectives, and circumstances. Obtain advice from qualified Thai counsel and a financial adviser before acting.