Taiwan’s 10% Daily Price Limit: Limit-Up Rules and Tick Math

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On October 14, 2026, the TAIEX closed at 48,625.83. In almost any Taipei session, a trader can run into an individual stock pinned at its 10% daily limit, its quote frozen while the rest of the tape moves on. If you have ever watched a Taiwan quote freeze at the limit and wondered what a frozen quote actually means, this guide is the durable answer.

The core takeaway: a Taiwan-listed stock normally cannot trade more than 10% above or below its reference price in one session, and because limit prices are rounded inward to the exchange tick, the real band is usually slightly tighter than 10%. When a stock locks at the limit, trading does not stop — the price stops. Unfilled orders queue at the limit price, matched volume collapses, and the remaining price discovery is pushed into the next session, into TAIFEX futures, or into overseas listings like ADRs.

The rule in one paragraph

Every ordinary share listed on the Taiwan Stock Exchange (TWSE) and the Taipei Exchange (TPEx) normally trades inside a static daily band of plus or minus 10% of a reference price. That reference is usually the previous session’s close, though the exchanges substitute an adjusted reference in special cases — ex-rights and ex-dividend sessions, for example. Newly listed ordinary shares are also exempt from price limits during their initial trading period, so a fresh IPO can move far more than 10% in its first days. Outside those exceptions, the band has been 10% since mid-2015, when Taiwan widened it from the 7% limit that had been in place for decades. There is no intraday reset, no expansion after a pause, and no volatility interruption that reopens the band: once the limit price prints, that is the best price available until the closing bell. Locals call the two states zhangting (漲停, limit-up) and dieting (跌停, limit-down), and you will see both words constantly in Taiwanese market commentary.

Worked example: computing TSMC’s actual band

The published rule says 10%, but the tradable band depends on tick rounding. TWSE tick sizes step up with price: NT$0.01 below NT$10, NT$0.05 from 10–50, NT$0.1 from 50–100, NT$0.5 from 100–500, NT$1 from 500–1,000, and NT$5 at NT$1,000 and above. The limit-up price is the previous close times 1.10 rounded down to the nearest valid tick; the limit-down price is the close times 0.90 rounded up. Here is the arithmetic on a real number:

  1. TSMC (2330) closed at NT$2,490.00 on October 14, 2026.
  2. Raw limit-up: 2,490 × 1.10 = NT$2,739. Above NT$1,000 the tick is NT$5, and 2,739 is not a valid tick, so round down to NT$2,735. That is +9.84%, not +10%.
  3. Raw limit-down: 2,490 × 0.90 = NT$2,241. Round up to the nearest tick: NT$2,245, or −9.84%.

The same math on Hon Hai (2317), which closed at NT$243.00 that day, gives a limit-up of NT$267.00 (the NT$0.5 tick truncates the raw NT$267.30). The practical lesson: if your order-entry system rejects a price you computed as exactly +10%, you probably ignored tick rounding. Terminal vendors display the exchange-computed limits, and those are the only prices that matter.

What actually happens at the limit

A limit is a price cap, not a trading halt. Understanding the difference is what separates reading a frozen quote correctly from misreading it:

  • Orders still match at the limit price. If a stock is limit-up and a holder decides to sell, the trade prints at the limit. During continuous trading, buy orders at the limit are matched in price-time priority, so an early place in the queue is a real edge — but the opening and closing sessions are call auctions that match at a single aggregated price under the exchange’s auction allocation rules, so queue position is not the sole determinant of a fill across the whole day.
  • A locked limit versus a touched limit are different signals. A stock that tags limit-up, trades heavy volume there, and backs off has found sellers — supply exists at that price. A stock that gaps to the limit early and sits with a massive untraded bid queue and almost no prints has found none. The second pattern is the stronger continuation signal, and it is visible in the data: look at matched volume relative to the stock’s normal turnover, and at the displayed size of the queue at the limit.
  • Volume collapse is the tell. A hard-locked limit-up day often shows a fraction of normal turnover, because almost nobody willing to sell remains. Low volume at limit-up is not apathy; it is excess demand that could not transact.
  • Repeated limit moves trigger surveillance. TWSE and TPEx flag abnormal movers as zhuyi (注意, attention) securities and can escalate to chuzhi (處置, disposition) status, under which matching may slow to intervals of several minutes and brokers may require cash up front before accepting orders. If you trade momentum names, check disposition status before assuming normal continuous matching.

How limits interact with news shocks

The limit does not change how far a price ultimately moves on real news; it changes when the move happens. A shock worth a 25% repricing becomes a sequence of limit sessions during which the printed price is an administrative ceiling, not a market-clearing level. Be careful with the arithmetic: limit moves compound, so three successive +10% sessions amount to about +33.1%, while three −10% sessions compound to only about −27.1%. The number of locked sessions a given shock produces therefore depends on direction, the starting price, tick rounding, and how much liquidity actually trades along the way. Three consequences follow:

  • Discovery migrates to uncapped venues. TSMC’s US-listed ADR trades without a Taiwan-style daily limit, so after a major shock the ADR often shows you where Taipei will reopen. Use it carefully: the ADR habitually carries a structural premium over the Taipei line — roughly 15–25% in recent years, as of October 2026 — because fungibility between the two is limited. The signal is in day-to-day changes in that gap, never in its level. TAIFEX index futures have their own daily limit, so they help with market-wide shocks but cannot fully reprice a single stock either.
  • The magnet effect is real but conditional. Academic and practitioner evidence broadly suggests prices approaching a limit can accelerate toward it, as traders rush to transact before the queue forms. Treat an approach to the limit in the final hour as its own momentum event.
  • Shorts can get trapped. Taiwan has two short channels: retail margin short selling, rongquan (融券), and institutional securities borrowing and lending (SBL). A short position in a stock locked limit-up cannot be covered at any price until sellers appear — the squeeze mechanics are more violent than in uncapped markets precisely because the exit is rationed. Checking a stock’s SBL and margin-short balances (published daily by TWSE; as of October 14, 2026, UMC carried an SBL short balance of about 112 million shares, for example) tells you how much forced covering a limit-up run could feed on.

How Taiwan compares with Korea, Japan, and the US

Market Per-stock daily limit Key nuance
Taiwan (TWSE/TPEx) ±10%, static Widened from 7% in 2015; no intraday reset; tick rounding tightens the band slightly
Korea (KRX) ±30%, static Widened from 15% in 2015; paired with single-stock volatility interruptions that pause and re-auction
Japan (TSE) Fixed yen amount by price band Works out to roughly 15–30% depending on price level; band can expand after consecutive limit days
United States No daily per-stock limit Limit Up–Limit Down pauses over rolling five-minute windows, plus market-wide 7%/13%/20% circuit breakers on the S&P 500

The design trade-off: Taiwan’s tight static band produces more limit events and slower price discovery than Korea’s wide band, and it removes the possibility of a double-digit single-stock move inside one session — whether that makes the market less prone to dislocations overall than the US intraday regime is a debated empirical question rather than a settled fact. For a foreign investor, the practical difference is that a Taiwan position can be unsellable at any price for a session or more — a liquidity risk that a US-trained risk model will not flag.

Reading the tape: a practical checklist

  1. Compute the band before the open. Previous close ×1.10 and ×0.90, rounded inward to the tick. Know the two numbers for anything you hold.
  2. At a limit print, check matched volume first. Heavy volume at the limit means two-way trade; near-zero volume means a lock.
  3. Check the queue. Displayed bid size at limit-up (or offer size at limit-down) is the backlog that must clear before the price can move freely.
  4. Check the uncapped venues after hours. ADR moves (for the handful of dual-listed names) and TAIFEX futures frame the next open.
  5. Check leverage balances. Daily TWSE margin and SBL files show whether a limit move is squeezing financed positions — for instance, TSMC carried a margin-buying balance of 33,766 lots against a margin-short balance of just 23 lots as of October 14, 2026, a heavily one-sided retail book.
  6. Check disposition status before assuming continuous matching on a stock with multiple recent limit days.

Does the TAIEX index itself have a daily limit?

No. The limit applies per security, not to the index — there is no separate trading limit on the TAIEX itself. In practice, though, the per-stock bands cap the index too: because virtually every ordinary constituent is confined to ±10% and the index is their weighted aggregate, the TAIEX cannot move more than about 10% in a session through ordinary limit moves alone. A larger move would require exceptional uncapped constituents — such as newly listed shares still in their limit-free period — or index and divisor adjustments. Taiwan has no US-style market-wide cash-equity circuit breaker; the per-stock bands are the system.

Can I still buy a stock that is locked limit-up?

Yes — you can place an order at the limit price and join the queue. Whether you are filled depends on sellers appearing and on the matching mechanics in force: in continuous trading, orders at the limit are filled in price-time priority, while the opening and closing call auctions allocate fills at a single matched price under the exchange’s auction rules, so being early helps but does not guarantee first fill in every session phase. What you cannot do is bid above the limit to jump the line.

Do ETFs and other products follow the same 10% rule?

ETFs tracking domestic Taiwan indices generally carry the 10% band. Leveraged and inverse ETFs on domestic indices are not exempt either: under the TWSE Rules Governing Trading of Beneficial Certificates, they carry a scaled daily limit equal to 10% multiplied by the leverage multiple — for example, ±20% for a 2x leveraged ETF and ±10% for a -1x inverse ETF. Only ETFs tracking foreign component securities and offshore ETFs are exempt from daily price fluctuation limits, since their fair value can legitimately move more than a domestic band allows. Always confirm the specific product’s limit treatment in the TWSE or TPEx product documentation.

Why did Taiwan widen the limit from 7% to 10%?

The 2015 reform aimed to speed price discovery and reduce the frequency of multi-day limit sequences, aligning the cash market band with the futures market. The 10% band has remained in place since then; for the current rule text, consult the TWSE and TPEx rulebooks directly.

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Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.

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