Holding capital back looks like indecision and is frequently the most consequential decision in the portfolio. It is also not free, and the honest version of the argument prices both sides.
13 min read · Level 2
Reserves are usually defended as prudence, and the defence is weaker than it sounds, because prudence describes the feeling rather than the mechanism. The real case is narrower and better: a reserve buys the ability to act in exactly the two situations where acting is most valuable and least likely - when a holding you own is working and getting more expensive, and when everything you might want to own is falling. Both are situations in which the fully invested investor is a spectator. What the argument does not license is holding cash indefinitely against an unnamed future, because that has a running cost you can calculate and a benefit you cannot. The test is simple and rarely applied: if you cannot state what would make you spend it, you are not holding a reserve, you are avoiding a decision.
A reserve is capital committed to a strategy but deliberately not deployed yet. In private investing it usually means money set aside to invest again in companies you already own - a follow-on. In public investing it usually means cash held so that a decline becomes an opportunity rather than a spectator sport. The informal name for both is dry powder.
The two are less similar than the shared name suggests. A follow-on reserve is earmarked for a decision you can already see coming, because a company that is working will raise again and your holding will shrink unless you participate. General dry powder is earmarked for a decision you cannot see coming, and therefore has no date at all.
That difference matters, because one of them has a cost you can estimate and the other has a cost that runs indefinitely.
Because in private markets, not reserving means your ownership of the successes is systematically smaller than you think. Every subsequent financing round reduces your percentage unless you buy more, and the rounds happen precisely in the companies that are doing well - so dilution falls hardest on the holdings that were going to produce your return.
And because in public markets, the only way a decline is useful to you is if you have something to buy it with. An investor fully deployed at all times experiences a crash purely as damage; an investor with a reserve experiences it as damage plus an opportunity. Neither is obviously right, but only one of them has a choice.
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First, what dilution actually does. A $5,000 cheque at a $5 million post-money valuation buys 0.1% of the company. If three later rounds each issue 20% new equity, the stake becomes 0.1% times 0.8 cubed - that is 0.1% times 0.512, or 0.0512%. Roughly half the ownership is gone, and nothing went wrong; this is what success looks like from the inside.
Now the cost of holding it. Maintaining 0.1% through a round that sells 20% of the company means buying 0.02% of the post-money company. At a $25 million post-money that is $5,000. At a $60 million post-money the same 0.02% costs $12,000. At $150 million it costs $30,000.
So holding a 0.1% stake through three rounds requires $5,000 plus $12,000 plus $30,000 - $47,000 of follow-on capital against a $5,000 first cheque, which is 9.4 times the original. Total invested $52,000 for the same 0.1% that the first $5,000 nominally bought.
That figure is the honest reason most small investors cannot maintain their ownership, and it is why reserves in practice go to a few holdings rather than all of them.
Now the other side. Suppose 20% of a portfolio sits in cash yielding 2% while the invested 80% earns 7%. The blended return is 0.2 times 2% plus 0.8 times 7%, which is 0.4% plus 5.6%, or 6.0% - a full percentage point below the fully invested version. Over ten years on $100,000 that is 1.07 to the tenth, or $196,715, against 1.06 to the tenth, or $179,085. The gap is $17,630, which is 9.0% less ending wealth.
Dry powder is not a free option. It is an option with a visible annual premium, and the question is whether what it buys is worth that.
The first mistake is treating a follow-on as automatic. Participating in a round at five times the price you first paid is a new investment at a new valuation, and it deserves the same analysis as a first cheque. 'I already own some' is not a thesis.
The second is the opposite: never following on, and being surprised when a genuinely successful holding turns out to be a small fraction of the portfolio by the time it matters. The arithmetic above is not subtle, and it is entirely predictable in advance.
The third is calling a reserve what is really an inability to decide. Cash held because nothing looks good enough is a position; cash held because you have not done the work is a delay wearing a strategy's clothes, and it tends to be deployed all at once at the least considered moment.
The fourth is holding dry powder for a decline that is defined only as 'when things get cheaper'. Without a written trigger, the reserve is normally still there after the decline has passed, because the moment it arrives is also the moment the case for waiting is most persuasive.
Write what share of the total allocation is for first positions and what share is held back. In private investing a ratio of at least one to one is common precisely because of the dilution arithmetic; whatever you choose, choose it before the first cheque, because afterwards every attractive candidate argues for spending the reserve.
Following on in everything is impossible at small scale and unwise at any scale. Write the rule - reserve capital goes to positions meeting specified evidence of progress - so the allocation is not decided by which founder asked most persuasively.
Ask whether you would buy this stake, at this valuation, if you owned none of it. If the answer is no, following on is paying to protect a percentage rather than to acquire value, and the percentage is not the thing that pays you.
Multiply the cash weight by the difference between what it earns and what the rest of the portfolio earns, then express it as a figure per year. A reserve you can name the annual cost of is a decision; one you cannot is a habit.
State the observable condition under which the reserve gets spent - a valuation level, a decline of a stated size, a specific kind of opportunity - and the amount that gets spent at each step. Deciding in the moment is how reserves survive the exact events they were held for.
When starting any private-market strategy, when a holding you own announces a new round, and whenever a cash balance has been sitting for long enough that nobody remembers whether it is a reserve or a residue.
Avoid holding a large reserve for an undated opportunity while a dated commitment elsewhere is under-funded. Money with a job has a prior claim, and reserves are for the undated part of the portfolio.
A shape reported repeatedly after major market declines is that investors who had deliberately held cash for exactly such a moment did not deploy it. The reasons given afterwards are specific and were genuinely persuasive at the time - the decline looked likely to continue, the news was unresolved, waiting for more clarity seemed obviously wiser. The reserve was then invested later, at higher prices, once conditions had visibly improved. The behaviour is not irrational so much as predictable: the conditions that make assets cheap are the same conditions that make buying them feel reckless.
A reserve without a written, observable deployment trigger tends to be spent after the opportunity it was held for, not during it.
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