In Korea, the most-watched gauge of retail buying capacity is not a survey or a positioning index — it is a cash balance. Tujaja yetakgeum (investor deposits: customer cash sitting idle in brokerage accounts) stood at roughly KRW 109.9 trillion as of mid-July 2026, about 3.2 times the KRW 34.4 trillion of outstanding margin loans. Read together, those two numbers tell you how much retail fuel is in the tank — and how much of what is already invested is running on borrowed money.
What investor deposits actually measure
Tujaja yetakgeum is the aggregate cash that customers hold at Korean securities firms: money wired in but not yet invested, proceeds from stock sales that have settled, and cash waiting for subscription events. Under Korean segregation rules, brokerages must deposit most of this client cash with the Korea Securities Finance Corporation, which is why a clean, market-wide daily figure exists at all.
Three things it is not:
- It is not the value of stocks held in brokerage accounts. It is only the uninvested cash portion.
- It is not a flow. It is a stock — a balance measured at a point in time, usually end of day.
- It is not a sentiment survey. Nobody is asked anything; the number is an accounting fact.
That last point is why practitioners trust it. The balance rises when investors sell shares and leave the proceeds parked, or when they wire fresh money in. It falls when they deploy cash into stocks or withdraw it to bank accounts. The interpretation takes work, but the measurement itself is hard to distort.
Why it became Korea’s favorite dry-powder indicator
Korea is a retail-heavy market. Individual investors historically account for a large majority of trading value on the KOSDAQ (the growth-stock exchange) and a substantial share on the KOSPI (the main board). When the marginal buyer is a household rather than a pension fund, a gauge of household cash-on-the-sidelines carries real information.
The series also earned its reputation through one memorable episode: during the 2020–2021 retail investing boom, deposits roughly doubled to a then-record peak near KRW 78 trillion in May 2021, moving ahead of the market’s melt-up. The symbolic KRW 100 trillion mark itself was not crossed until January 2026. Since then, strategists treat sustained builds in deposits as accumulating dry powder and sustained drains as either deployment (bullish if the market is rising) or capitulation and withdrawal (bearish if it is falling).
Where the number comes from: KOFIA
The publisher is KOFIA — the Korea Financial Investment Association, the self-regulatory body for securities firms. Its statistics portal (freesis.kofia.or.kr) carries the daily series with a lag of roughly one to two business days. Portals such as Naver Finance republish the same figures. Two units matter:
- Jo won = KRW 1 trillion. Investor deposits are quoted in this unit.
- Eok won = KRW 100 million. Daily flow data, such as foreign net buying, is quoted in this unit. 10,000 eok won equals 1 jo won.
On the same portal you will find the natural companion series: sinyong yungja (margin loans — money brokerages have lent customers to buy stocks, reported as an outstanding balance). Deposits measure the cash not yet committed; margin loans measure commitment made with leverage. The two together frame the retail balance sheet.
A worked example: reading the July 2026 figures
Here is an actual set of published numbers and how a practitioner walks through them, step by step.
- Pull the deposit level. Investor deposits: 109.866972 jo won as of 2026-07-15 — read this as roughly KRW 109.9 trillion. On its own this says only that the balance sits above the symbolic 100 trillion line, historically associated with a well-funded retail base.
- Pull the margin balance. Margin loans: 34.370184 jo won as of the same date — roughly KRW 34.4 trillion. Divide: deposits cover margin about 3.2 times over. A high coverage ratio means the retail cohort still has far more cash in reserve than it has borrowed, which softens forced-selling risk in a drawdown.
- Add the flow context. Over the ten sessions ending 2026-07-16, foreign investors net sold roughly KRW 6.0 trillion of Korean equities (summing the daily figures, which ranged from -29,172 eok won on 2026-07-07 to +23,031 eok won on 2026-07-15). Yet the KOSPI closed that window at 6,820.60 and the KOSDAQ at 791.84. Someone absorbed the foreign supply — and a KRW 109.9 trillion deposit base is exactly the kind of pool that can do it.
- Check the currency. USD/KRW closed at 1,478.01 in the same period. A weak won is often part of the story when foreigners sell; it also means domestic cash is the more natural marginal buyer, reinforcing the relevance of the deposit gauge.
- State the read plainly. Elevated deposits, moderate leverage relative to those deposits, and evidence that domestic money is absorbing foreign selling. That is a "dry powder present, not yet exhausted" configuration — a description of capacity, not a forecast.
The four-quadrant read: deposits versus margin loans
The single most useful habit is to never read deposits alone. Cross them with the direction of margin loans:
| Deposits | Margin loans | Typical interpretation |
|---|---|---|
| Rising | Falling | De-risking: investors are selling, repaying leverage, and parking cash. Dry powder builds, but so does caution. |
| Rising | Rising | Fresh money is entering faster than it is deployed, and confidence is high enough to borrow. Late-cycle if extreme. |
| Falling | Rising | Aggressive deployment: cash is being spent and leverage added. Fuel is being burned; watch the coverage ratio. |
| Falling | Falling | Retreat: money is leaving the market entirely — deployment is not the explanation. The bearish quadrant. |
Add the market’s own direction as a third axis. Falling deposits during a rising market usually mean cash is being put to work (constructive). Falling deposits during a falling market suggest withdrawal to bank accounts (capitulation). The identical deposit print carries opposite meanings depending on price action.
Common mistakes and failure modes
- Comparing raw levels across eras. KRW 100 trillion of deposits against a much larger total market capitalization is less relative firepower than the same figure was years earlier. Scale mentally by the size of the market, or at least by round-number eras, before calling a level "historically high."
- Ignoring subscription distortions. Deposits spike mechanically around large IPO subscriptions, when investors wire in cash to bid for allocations, and drop when refunds go back out. A one-week surge around a blockbuster listing is plumbing, not sentiment.
- Confusing the balance with net buying. Deposits can rise on a heavy retail selling day — sale proceeds land in the account as cash. If you want to know what retail actually bought or sold, use the investor-type net-purchase data from KRX, not the deposit series.
- Trading single-day wiggles. Settlement timing, dividend payments, and tax dates all push the daily print around. Practitioners read five-day and monthly changes; the daily figure is noise more often than signal.
- Forgetting the lag. The published number is one to two business days old. It describes positioning going into recent sessions, not the reaction to them.
FAQ
How often is the figure published, and how timely is it?
KOFIA updates the series each business day on its statistics portal, typically with a lag of one to two business days. For most uses — tracking weekly and monthly trends — that lag is irrelevant. It only becomes a problem if you try to use deposits as a same-day trading signal, which they were never designed to be.
Does a high deposit balance mean the market will go up?
No. Deposits measure capacity, not intent. Cash can sit idle for months, migrate to money-market funds, or leave for real estate and bank deposits. High deposits make sustained rallies easier to fund and drawdowns easier to absorb; they do not cause either. Treat the series as a constraint indicator — it tells you what retail could do, not what it will do.
How do margin loans change the picture?
Margin loans (sinyong yungja) are the leverage counterweight. A deposit base of roughly KRW 109.9 trillion against roughly KRW 34.4 trillion of margin loans — the mid-July 2026 configuration — implies coverage of about 3.2 times. When that ratio compresses sharply, the retail cohort is increasingly running on borrowed money, and margin-call cascades in a selloff become a live risk. When it expands, the base is getting more conservative.
Where can a non-Korean-speaking investor find the data?
The primary source is KOFIA’s statistics portal (freesis.kofia.or.kr); browser translation handles the tables adequately since the content is numeric. Naver Finance republishes investor deposits, margin balances, and daily investor-type flows in simple table form. KRX’s data portal covers trading-by-investor-type, and Bank of Korea’s ECOS system holds the broader monetary aggregates useful for context.
Sources
- KOFIA statistics portal — freesis.kofia.or.kr
- KRX data portal — data.krx.co.kr
- Naver Finance — finance.naver.com
- Bank of Korea ECOS — ecos.bok.or.kr
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.