# insider

/ˌɪnˈsaɪdɝ/ (US) · /ɪnsˈaɪdɐ/ (UK)

Source: https://englishreference.com/word/insider
Updated: 2026-06-20

## Senses

### 2. finance/trading

noun · CEFR C1 · Technical

someone who works for a company and uses private information to buy or sell its stocks.

For teachers: a person, such as a director or executive, who has access to non-public, price-sensitive information about a corporation.

- The government is investigating him for illegal insider trading.
- Regulatory bodies monitor unusual market activity to detect whether an insider is profiting from non-public information regarding upcoming quarterly results.

## Examples

- An insider leaked the secret plans to the press.
- According to a company insider, the CEO plans to resign before the end of the fiscal year.
- The investigation focused on whether the suspect acted as an insider, utilizing confidential data to execute trades before the merger was officially announced to the public.

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