MAM allocation methods: why account results differ

Multi-account management, or MAM, can let a manager execute trades for several accounts from a management interface. That description alone does not explain how much exposure each account receives, what happens when an account lacks margin, or how an investor can stop participation. These details depend on the software, hosting provider and management agreement. The MAM label is not a substitute for checking them.

Trade allocation is not profit sharing

Trade allocation determines the position size opened in each account. Profit sharing or the calculation of a manager's performance fee is a separate process governed by the agreement. Two accounts following the same manager may have different returns because their balances, risk settings, costs and connection dates differ.

Which allocation methods might be available?

• Allocation by balance or equity: each account's weight is calculated from a financial base. Establish whether the system uses balance or equity and when that base is updated.
• Predetermined weights: the manager assigns a ratio or size to each account. A fixed ratio may not remain aligned with the account owner's current loss tolerance.
• Separate subaccount settings: some implementations allow account-specific sizes or limits. Confirm the capability with the provider hosting that particular account; it is not universal.

A simple example with explicit assumptions

Suppose there are only two accounts with allocation bases of 1,000 and 2,000 units of the same currency. If the system divides a 0.30-lot order proportionally at that moment, without other constraints, their calculated shares are 0.10 and 0.20 lots. This example does not recommend a position size or guarantee matching returns. Execution prices, commissions and changes in account equity can affect the outcome.

For a smaller account, minimum lot sizes or volume increments may prevent the calculated share from being executed exactly. The rules for rounding, rejecting an order or handling a discrepancy should be clear in advance. Increasing the size to meet a minimum can unintentionally raise the smaller account's relative risk.

Questions to put in writing before connecting

1. What is the allocation base, and when does it change after a deposit or withdrawal?
2. If only one account lacks margin, how are the other orders handled?
3. Where are account-specific size limits, loss limits and stopping permissions configured?
4. How are connection failures and execution-price differences reported and reviewed?
5. What happens to open positions when management ends, and who is responsible for closing them?

What should the records allow you to reconcile?

Keep timestamps, symbols, direction, requested and executed sizes, execution prices, costs and balance movements. Compare the manager's report with the statement for your own account, rather than relying only on a sample account's chart. Do not send login credentials, passwords or trading- or withdrawal-enabled keys for a public evaluation.

To begin your review, examine the trading-account information available on the platform and establish whether the actual management method is MAM or something else. A listing alone does not establish suitability for you. In the scenario and cost calculators, enter assumptions separately; a calculation is not a profit forecast.

Conclusion

A MAM assessment should not rest solely on the number of connected accounts or the manager's returns. Allocation rules, exceptional-case handling, risk controls and reconcilable records matter. This article explains a mechanism rather than providing personal investment advice. Leveraged trading can result in substantial losses.