31 CFR §566.306

1. (a)An insured bank (as defined in section 3(h) of the Federal Deposit Insurance Act (12 U.S.C. 1813(h));
2. (b)A commercial bank or trust company;
3. (c)A private banker;
4. (d)An agency or branch of a foreign bank in the United States;
5. (e)Any credit union;
6. (f)A thrift institution;
7. (g)A broker or dealer registered with the Securities and Exchange Commission under the Securities Exchange Act of 1934 (15 U.S.C. 78a et seq.);
8. (h)A broker or dealer in securities or commodities;
9. (i)An investment banker or investment company;
10. (j)A currency exchange;
11. (k)An issuer, redeemer, or cashier of travelers' checks, checks, money orders, or similar instruments;
12. (l)An insurance company;
13. (m)A dealer in precious metals, stones, or jewels;
14. (n)A loan or finance company;
15. (o)A licensed sender of money or any other person who engages as a business in the transmission of funds including any person who engages as a business in an informal money transfer system or any network of people who engage as a business in facilitating the transfer of money domestically or internationally outside of the conventional financial institutions system;
16. (p)A business engaged in vehicle sales, including automobile, airplane, and boat sales;
17. (q)Any business or agency which engages in any activity which the Secretary of the Treasury determines, by regulation, to be an activity which is similar to, related to, or a substitute for any activity in which any business described in this paragraph is authorized to engage; or
18. (r)Any other business designated by the Secretary whose cash transactions have a high degree of usefulness in criminal, tax, or regulatory matters.