Frequency/market practice: Very common. Materiality qualifiers are commonly seen but are rarely quantified (other than specific warranties, e.g., contract value).
Frequency/market practice: Knowledge qualifiers are primarily based on constructive knowledge (after due inquiry), although an actual knowledge standard is sometimes used. Knowledge is commonly limited to a list of persons or group of persons (typically, specific officers or directors of the target company) specified in the transaction document.
Frequency/market practice: Rarely. It is uncommon for a seller to make a representation that none of the target's representations or warranties made in the acquisition agreement or disclosure schedules contain any materially misleading or omitted statement.