Home › CFR › Title 12 › Part 25112 CFR Part 251 — Concentration Limit (Regulation XX)§ 251.1— Authority, purpose, and other authorities.§ 251.2— Definitions.§ 251.3— Concentration limit.§ 251.4— Exceptions to the concentration limit.§ 251.5— No evasion.§ 251.6— Reporting requirements.