According to FINRA, Arni Jay Diamond was assessed a deferred fine of $5,000 and suspended from association with any FINRA member in all capacities for four months for making unsuitable recommendations in speculative alternative investments to two customers in their sixties that were inconsistent with the customers' investment profiles. Diamond recommended that the customers purchase limited partnership interests, and these recommendations were unsuitable based on multiple factors.

For the first customer, the recommendations were unsuitable based on age, income, net worth, and risk tolerance. Additionally, this customer was not an accredited investor, which was required to invest in the limited partnership interests. Accredited investor requirements exist to limit certain high-risk investments to individuals with sufficient financial sophistication and resources to bear potential losses. By recommending that a non-accredited investor purchase these investments, Diamond exposed the customer to risks that regulations specifically aim to prevent.

For the second customer, Diamond's recommendations resulted in an over-concentration of that customer's net worth in alternative investments. Concentration risk is a fundamental investment principle—having too much of one's portfolio in any single asset class, particularly speculative alternatives, can expose investors to catastrophic losses if those investments perform poorly. Alternative investments such as limited partnerships often involve higher risks, lower liquidity, and less transparency than traditional investments, making over-concentration particularly dangerous.

Both customers ultimately settled arbitration claims filed against Diamond's member firm, suggesting they suffered losses from these unsuitable investments. Suitability obligations require brokers to have a reasonable basis to believe that recommended transactions are suitable for customers based on their financial situations, investment objectives, and risk tolerance. This includes considering whether recommendations result in inappropriate concentration. For investors, this case highlights the importance of understanding alternative investments before committing capital. Limited partnerships and other alternatives can be appropriate for some investors but involve significant risks including illiquidity, complexity, lack of transparency, and potential for total loss. Investors should carefully evaluate whether they meet accredited investor standards when required, should ensure alternative investments represent only an appropriate portion of their portfolio, and should not feel pressured to invest in products they don't fully understand. If recommendations seem inconsistent with stated investment goals or risk tolerance, investors should question them and consider seeking second opinions.