Investment and Arbitrage Draw on the Same Balance in Different Ways

Anthony Rei, Investment Manager at Hirschmann Private, spends much of his week on the account side with clients who want to add a position and are not sure how much room the account has left. The question sounds simple, and the platform shows a figure that seems to answer it. In practice the answer depends on which number the client reads, what is already set aside for open trades, and what the next order will ask of the balance once it is filled.

A simple purchase uses the account in a fairly direct way. Cash leaves the balance, or margin is allocated against it, and the position appears as one exposure with one value attached. A trade with two legs, such as a hedge, behaves differently. It may need available margin on both sides at the same time, and the requirement can be larger while the apparent risk is smaller. Two positions that each look modest in isolation can, together, ask the account for more than either would alone, and that gap is where plans tend to break.

Three Figures That Can All Be Called Available

Buying power is the resource every new order competes for, and it does not care what kind of trade is asking. A purchase commitment and a margin requirement both reduce what is available to open the next trade. When clients tell me they still have room in the account, I ask room measured how: settled cash, available margin, or the number that actually limits the next order. Those three figures can differ, and the difference is where surprises accumulate.

Anthony Rei mentioned that "A client can hold six sensible investments and one hedged pair and still be constrained by the pair, because both legs need to be covered at the same time. The position that feels smallest is not always the position that uses the most capacity. "

Money Spent and Money Set Aside

Money committed to a position is money that has been spent on an asset. Money set aside as margin for an open trade is money still sitting on the account that is no longer free to use. The distinction matters at the moment a client wants to add something, because the headline balance may include funds that are already committed. Set aside amounts can also shift while a trade is open. If the price moves against a margined position, the loss comes out of equity and the free figure shrinks, even though the client has done nothing.

"Clients often check the balance, see a healthy number, and place the order. The figure they needed was the free margin, and that one was already half used. "Anthony Rei told us in the interview.

When a New Opportunity Arrives in a Tight Week

Competition for capacity shows up in ordinary ways. An investment opportunity appears in the same week a hedged trade is running with collateral tied up on two venues. A margin setting moves and a previously comfortable book becomes tight. A short leg is closed early and capacity returns in an amount the client did not anticipate. None of this is a fault in any single position. It is what happens when one balance supports several positions with different shapes.

The practical response is to decide how much of the account should stay free at all times, so that a new idea is judged against the room that is genuinely spare and not the room that only looks spare.

A Short Capacity Check Before Any New Order

The check I recommend is short. Before adding a position, look at available margin, note what is already set aside for open trades, and estimate what the new order will require once it is filled. Then confirm the capacity it needs will still be there for as long as the trade is expected to run, which is often the harder question for positions with more than one leg, where each leg settles on its own schedule. Leaving a cushion for adverse moves in existing positions belongs in the same check.

An account rarely runs out of room all at once. It narrows one order at a time, and the client who reads the right figure before each order sees the narrowing while there is still a choice about what to add.

Mr. Rei also said "Capacity is the part of the decision clients check last. A trade that is sound in every other respect can still be the wrong one to add on a day when the balance is already spoken for."

Anthony Rei is Investment Manager at Hirschmann Private.

Disclaimer: The content of this article is provided for general informational purposes only and should not be interpreted as personalized financial or trading advice. The author makes no representations or warranties regarding the accuracy, completeness, or timeliness of the information presented. Market dynamics are subject to frequent change, and past insights may not reflect current conditions. Readers should independently verify all facts and consult with a qualified financial advisor before making any investment decisions. The author and publisher accept no responsibility for any financial losses, decisions, or consequences resulting from reliance on this content. All actions taken based on this information are at your own risk.

COMTEX_494141313/2891/2026-10-12T12:32:15

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