追証

• Reading: おいしょう
• Romaji: oishou
• Kanji breakdown: 追 (tsui/o) — pursue, additional; 証 (shou/akashi) — proof, certificate, margin
• Pronunciation: /o.i.ɕoː/

Meaning

Margin call; a demand from a broker or exchange for an investor to deposit additional funds to cover losses in a leveraged position.

A noun short for 追加証拠金 (tsuika shōkokin — additional margin deposit). When the value of a leveraged trading position falls below the maintenance margin level, the investor receives a 追証 notice and must deposit more funds or face forced liquidation. Common in futures, FX margin trading, and margin stock accounts. Receiving a 追証 is a high-stress event for leveraged traders.

Examples

1. 相場の急落で追証がかかり、やむなくポジションを決済した。 A sudden market plunge triggered a margin call, and I had no choice but to close my position.
2. 信用取引では追証のリスクを常に意識する必要がある。 In margin trading, it is essential to always be aware of the risk of a margin call.
3. 追証を受けた多くの投資家が損切りを余儀なくされた。 Many investors who received margin calls were forced to cut their losses.

Usage Guide

Context: investing, trading, finance

Tone: neutral

Origin & History

Abbreviated from 追加証拠金 (tsuika shōkokin). 追 (oi) means additional or pursuing, and 証 is short for 証拠金 (shōkokin — margin, collateral). Together: additional margin required.

Cultural Context

Era: Modern

Generation: Adults

Social background: Investors