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Ceiling and floor price

Ceiling and floor are the highest and lowest prices a stock can reach during the day; on Borsa Istanbul they are usually ±10% of the reference price. Borsa Istanbul sets a reference (base) price for every stock at the start of the day and applies the price margin as a percentage of it.
Contents
  1. 1.Key points
  2. 2.Formula / calculation
  3. 3.Interpretation
  4. 4.Pitfalls
  5. 5.Frequently asked questions

Key points

  • The price cannot trade outside these limits; buyers queue at the ceiling and sellers at the floor.
  • A ceiling with a large buyer queue signals strong demand, a floor with a seller queue strong supply.
  • placing a buy order at the ceiling does not guarantee a fill; queue position matters.

Formula / calculation

Ceiling = Reference price × 1.10; Floor = Reference price × 0.90 (the margin varies by stock group and precaution status, and is narrowed for some stocks). Prices are rounded to the tick size. Yatırımcı.AI stock pages show the day’s ceiling and floor.

Interpretation

A ceiling with a large buyer queue signals strong demand, a floor with a seller queue strong supply. Consecutive ceilings can be news-driven or manipulative; consecutive floors point to bad news or a liquidity crunch.

Pitfalls

placing a buy order at the ceiling does not guarantee a fill; queue position matters. A ceiling streak often ends with a sharp drop. Do not confuse it with a circuit breaker; ceiling/floor limits trading, it does not halt it.

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Related terms

Frequently asked questions

Ceiling and floor are the highest and lowest prices a stock can reach during the day; on Borsa Istanbul they are usually ±10% of the reference price.

Ceiling = Reference price × 1.10; Floor = Reference price × 0.90 (the margin varies by stock group and precaution status, and is narrowed for some stocks). Prices are rounded to the tick size. Yatırımcı.AI stock pages show the day’s ceiling and floor.

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