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Definitions

insider

[in-sahy-der] / ˌɪnˈsaɪ dər /
NOUN
accessory
Synonyms
STRONG
abettor accomplice aid aide assistant associate colleague confederate conspirator helper partner plant ringer shill stall subordinate
WEAK
co-conspirator
Antonyms
STRONG
antagonist boss enemy foe leader opponent superior
WEAK
principal
NOUN
accomplice
Synonyms
STRONGEST
aide associate co-conspirator collaborator conspirator
STRONG
abettor accessory aid ally assistant colleague confederate partner plant stall
Antonyms
STRONG
antagonist enemy
WEAK
adversary opponent
NOUN
cognoscente
Synonyms
STRONG
connoisseur critic expert judge specialist
Antonyms
STRONG
ignoramus

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Polymarket, which has an offshore platform unavailable to users in the U.S., changed its rules in March to explicitly prohibit insider trading there.

From The Wall Street Journal • Apr. 30, 2026

“It seems the only insider active during this period of excess volatility was Pentwater Capital,” Avis CEO Brian Choi told investors on Wednesday.

From MarketWatch • Apr. 30, 2026

Pentwater acknowledged in its filings that 94,000 of the shares sold are subject to laws prohibiting short-term insider buying and selling—known as a short-swing profit.

From Barron's • Apr. 29, 2026

In a separate lawsuit brought by the Commodity Futures Trading Commission, an independent US federal agency, he is also accused of insider trading.

From BBC • Apr. 28, 2026

It was information only a highly placed insider could have acquired.

From "Spies: The Secret Showdown Between America and Russia" by Marc Favreau