An internal investigation log is primarily intended to track the status of investigations into unusual activity. This is to ensure that the investigations are conducted in a timely, thorough, and consistent manner, and that the results and recommendations are documented and communicated to the relevant parties12. An internal investigation log can also help the organization to identify any trends, patterns, or gaps in its anti-money laundering (AML) compliance program, and to measure its effectiveness and efficiency3.
An internal investigation log is not intended to provide training on investigations to the anti-money laundering officer and Financial Intelligence Unit (FIU), report status of investigations to the Board of Directors, or detect and monitor possible suspicious activity. These are separate functions that may involve the use of the internal investigation log, but are not its primary purpose.
References:
1: How to Conduct Effective AML Investigations - Blog | Unit211 2: BSA/AML Internal Audit: PwC2 3:
Anti-Money Laundering: 5 Steps to Conduct an Audit3

Explanation
The practice of brokerage firms maintaining securities as nominees and the speed of the transactions are two factors specific to the securities industry that increase the exposure to money laundering risk. Nominee accounts can be used to conceal beneficial ownership and obscure transaction trails. The speed of transactions can make it difficult to detect and prevent suspicious activity in real time.

Explanation
To work in parallel with FATF by operating on the basis of (mutual, joint, or common) recognition of their work is an objective of the Financial Action Task Force (FATF)-Style Regional Bodies (FSRBs). FSRBs are regional organizations that have been established by their member jurisdictions to foster implementation of anti-money laundering and counter-terrorist financing standards at a regional level. They are recognized by FATF as associate members and operate on a principle of mutual recognition of their work2