The DOL has released its Class Exemption for Principal Transactions.
Document Excerpt
SUMMARY: This document contains an exemption from certain prohibited Transactions provisions of the Employee Retirement Income Security Act of 1974 (ERISA) and the Internal Revenue Code (the Code). The provisions at issue generally prohibit fiduciaries with respect to employee benefit plans and individual retirement accounts (IRAs) from purchasing and selling investments when the fiduciaries are acting on behalf of their own accounts (principal transactions). The exemption permits principal transactions and riskless principal transactions in certain investments between a plan, plan participant or beneficiary account, or an IRA, and a fiduciary that provides investment advice to the plan or IRA, under conditions to safeguard the interests of these investors. The exemption affects participants and beneficiaries of plans, IRA owners, and fiduciaries with respect to such plans and IRAs.
Link
https://s3.amazonaws.com/public-inspection.federalregister.gov/2016-07926.pdf