The financial industry is (for obvious reasons) the most at risk from crime (be it fraud, money laundering or other risks). The insurance industry is a very close second.
You wouldn't doubt me for a minute if I told you that the insurance industry shares data. Which they do.
So you are being incredibly naïve if you think the financial industry does not share data.
Organised criminals don't work in silos. The only way to effectively combat organised crime is to work in an organised manner to fight it, and that absolutely does involve data-sharing.
I'm sure if you look at the small-print for any retail broker, you'll find data-sharing provisions. The wording may not be explicit, but the wording of their small print will be such that it allows them to.
For example.... a quote from ctfc.gov website:
The final rule permits financial institutions required by the BSA to establish AML Programs and associations of such financial institutions to share information regarding individuals and other persons involved in possible terrorist activity or money laundering. FCMs and IBs are required to establish AML Programs, and thus are permitted to share information with other financial institutions that are required to establish AML Programs, such as other FCMs, IBs, broker-dealers, and banks.
Or from the SEC website .....
Voluntary Information Sharing Among Financial Institutions: Section 314(b): A separate safe harbor provision encourages and facilitates voluntary information sharing among participating financial institutions. The safe harbor provision, added to the BSA by Section 314(b) of the USA PATRIOT Act, protects financial institutions, including broker-dealers, from certain liabilities in connection with sharing certain AML related information with other financial institutions for the purposes of identifying and reporting activities that may involve terrorist acts or money laundering activities. Treasury's implementing regulations require that a financial institution or association of financial institutions that intends to share information pursuant to the regulations must file an annual notice with FinCEN, maintain procedures to protect the security and confidentiality of the information, and take reasonable steps to verify that the financial institution or association of financial institutions with which it intends to share the information has filed the required notice with FinCEN. This may be done by checking a list that FinCEN makes available. A notification form and instructions for submitting a notification form (initial or renewal) are available on FinCEN's website.
As I said... in any "western" country, you'll definitely find information sharing.