To The Moon

The core idea behind index-inclusion arbitrage is to exploit the

mechanical buying created by index funds and ETFs around an

index-rebalance effective date: build the position before passive funds

must trade, then exit when those passive buyers are forced to execute.

For a low-float, high-profile stock such as SPCX that is being

fast-tracked into major indexes, this logic can indeed create short-term

alpha.

But this is not a simple trade where "passive funds must buy at the

close, so buying early is guaranteed to work." SPCX is special because

the potential buy demand is enormous and highly predictable.

Underwriters, hedge funds, high-frequency traders, and passive funds all

know the same thing. What determines the outcome is not only how much

passive capital needs to buy, but whether that buying pressure remains

larger than active arbitrage selling, underwriter supply, and other

liquidity releases at the close on the effective date.

1. TRADE LOGIC: WHY FORCED BUYING EXISTS

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Once SPCX is added to major indexes such as the Nasdaq-100, Russell,

CRSP, and others, passive products tracking those indexes need to hold

SPCX according to its index weight. Because passive funds generally try

to minimize tracking error, much of this buying tends to concentrate in

the closing auction on the trading day before the index adjustment takes

effect, often through MOC (Market-On-Close) orders.

The theoretical arbitrage path is:

1. Buy SPCX before the index adjustment formally becomes effective.

2. Wait for passive funds to generate mechanical buy demand around the

effective date.

3. Sell to passive buyers in or near the closing auction.

This framework is not new. When Tesla was added to the S&P 500 in

December 2020, the market saw a similar setup: TSLA was pushed higher in

the closing auction on the trading day before inclusion as large passive

buy orders came in, but the stock then opened sharply lower the next

trading day.

That case shows that index-inclusion buying can create a real price

impact at the close, but it also shows that the exit window can be

extremely narrow, with significant slippage and overnight risk.

2. PASSIVE-BUYING SCALE: THREE MEASUREMENT BUCKETS

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Based on currently public information and an assumed SPCX price of about

$192.50, passive absorption around the effective date can be divided

into three buckets.

Bucket 1: QQQ + QQQM, the two main ETFs themselves

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Estimated dollar buy demand:

About $2.8B-$4.2B

Implied SPCX shares:

About 14.5M-21.6M shares

Notes:

Estimated using QQQ AUM of about $495.7B, QQQM AUM of about

$98.48B, and an SPCX weight of 0.47%-0.70%.

Bucket 2: Entire Nasdaq-100 tracking ecosystem

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Estimated dollar buy demand:

About $6.6B-$9.8B

Potentially $12B-$18B if the new rule amplifies the weight

Implied SPCX shares:

About 34M-51M shares

High-case: about 65M-94M shares

Notes:

CME says about $1.4T tracks the Nasdaq-100, and low-float names may

use up to three times actual float for index-weight purposes.

Bucket 3: Nasdaq-100 + Russell/CRSP and other near-term passive indexes

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Estimated dollar buy demand:

About $22B-$27B

Implied SPCX shares:

About 114M-140M shares

Notes:

This is closer to the market-wide passive-buying bucket relevant for

trading.

Basic formula

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Implied buy shares =

Passive AUM x SPCX index weight / SPCX price

If the price on the effective date is above $192.50, the same dollar buy

demand translates into fewer shares. If the price is below $192.50, it

translates into more shares. Share estimates therefore need to be

updated dynamically as both price and final index weight change.

The key constraint is public float. SPCX initially issued about 555.6M

shares in the IPO, and the greenshoe later added about 83.3M shares,

increasing publicly tradable shares from roughly 556M to about 639M.

CME's framework puts the initial public float at about 4.3%, while the

Nasdaq-100's new rule may allow an effective float of about 12.9% for

index-weight calculations. In other words, index demand for a low-float

company can be amplified.

From a trading perspective:

Conservative bucket:

QQQ/QQQM itself, about 15M-22M shares.

Broader Nasdaq-100 passive ecosystem:

About 34M-94M shares.

Nasdaq-100 plus Russell/CRSP and other near-term passive indexes:

A reasonable central estimate could reach 120M-150M shares.

That equals roughly 20%-25%+ of current public float, which is a very

large mechanical demand event.

S&P 500 buying should not be included in this near-term trade. Because

S&P has not adopted Nasdaq's fast-inclusion rule, SPCX would likely not

be eligible for S&P 500 inclusion until 2027 or later. Future S&P 500

inclusion could become a separate passive-buying catalyst, but it is not

part of this QQQ effective-date trade.

3. WHY "HUGE BUY DEMAND" DOES NOT MEAN "THE CLOSE MUST RALLY"

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The SPCX index-inclusion trade is difficult precisely because the

expectation is almost completely transparent. Underwriters, active

funds, high-frequency traders, and retail investors can all estimate the

scale of passive demand. The more transparent the buy demand is, the

easier it is to front-run and pre-discount.

3.1 The Expectation May Already Be Priced In

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SpaceX is a massive, highly watched IPO. The IPO price, first-day rally,

and subsequent secondary-market price may already reflect a meaningful

portion of the index-inclusion premium. Sophisticated index-arbitrage

players often build their positions on the IPO day, in the grey market,

or during early liquidity windows instead of waiting until the final

close before the effective date.

That means the pre-effective-date rally may not be driven entirely by

new fundamental revaluation. It may simply be passive-buying

expectations being capitalized in advance. Once the event arrives, the

close can become the window where active funds exit into that expected

demand.

3.2 Passive Buyers Are Not the Only Participants in the Closing Auction

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On the surface, passive funds submitting MOC orders are natural buyers.

But in the same Closing Cross, the sell side may also be very strong.

- Profit-taking by front-runners:

Many arbitrage funds that bought SPCX early will want to sell

precisely when passive funds must buy in the closing auction.

- Liquidity release by underwriters:

The greenshoe mechanism and over-allotment option mean underwriters

may have tools to stabilize abnormal volatility during the early

post-IPO period. If index inclusion creates an excessive price

spike, underwriters may have an incentive to release additional

supply.

- Opposite-side trading by multi-strategy funds:

Some funds may not simply buy and wait. They may trade around

closing imbalances, options, baskets, and related index-constituent

adjustments.

If active selling, underwriter supply, and other liquidity releases

exceed forced passive buying, the close may fail to rally and could

instead become a "sell-the-news" liquidation event.

3.3 The Execution Window Is Extremely Narrow

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Even if the directional thesis is right, the trade can fail on

execution. The closing auction price is determined by a single Closing

Cross, not by ordinary continuous trading. If NOII (Net Order Imbalance

Indicator) data changes rapidly that day, retail brokers or

lower-priority execution routes may face delays, slippage, or fills that

differ materially from expectations.

The TSLA S&P 500 inclusion case shows that passive buying can push a

stock higher at the close, but the optimal exit point may last only

briefly. Missing the auction, suffering large slippage, or being forced

to carry the position overnight can turn an index-inclusion gain into a

drawdown.

4. PRE-TRADE CHECKLIST

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If this strategy is still going to be executed, it should be treated as

an event-driven trade rather than a simple directional bet. The core

checklist is:

1. Confirm the effective dates and final weights

Use official announcements from Nasdaq, Russell, CRSP, MSCI, and

other relevant index providers. Do not rely only on media reports

or third-party estimates. Weight changes directly alter the number

of passive shares that must be bought.

2. Update passive-buying estimates dynamically

Use the latest AUM, final index weights, and real-time SPCX price

to update implied buy shares. Separate QQQ/QQQM, the broader

Nasdaq-100 ecosystem, and Russell/CRSP or other index buckets. Do

not include future S&P 500 buying in the near-term trade.

3. Monitor NOII data after 15:50 ET

Nasdaq usually begins publishing closing imbalance data after

15:50 ET. If the buy imbalance is large and continues to expand,

the strategy's probability improves. If sell interest has already

absorbed passive demand, the position should be reduced or

abandoned.

4. Evaluate execution route and order type

MOC, LOC (Limit-On-Close), and ordinary late-day sell orders carry

different execution risks. Confirm whether the broker supports the

target order type, submission cutoff time, modification limits, and

auction priority.

5. Define exit and failure conditions in advance

"Sell to passive funds at the close" cannot be the only plan. If

NOII reverses, price overshoots too early, liquidity becomes

abnormal, or execution quality deteriorates, there should be a

clear rule for stepping back.

5. VERIFIABLE INFORMATION AND UNVERIFIABLE ASSUMPTIONS

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Some variables in this strategy can be verified. Others can only be

assumed.

Verifiable variables:

- Official index-inclusion decisions, effective dates, and final

weights.

- AUM for QQQ, QQQM, and other relevant ETFs.

- NOII closing-imbalance data after 15:50 ET.

- Same-day volume, closing-auction volume, order-book depth, and

actual auction price.

Variables that cannot be fully verified:

- Whether underwriters will actively release supply into the close.

- The size and cost basis of arbitrage positions already built in

advance.

- True selling pressure from dark pools, basket trades, and

derivatives hedging.

- The timing of unwind activity by multi-strategy funds before and

after the effective date.

The key question is therefore not whether passive funds must buy. They

do. The real question is whether, at the closing auction on the

effective date, passive buy demand is still the marginal force

dominating active selling.

CONCLUSION

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The SPCX index-inclusion trade is a real opportunity. Combined near-term

passive demand from major indexes could reach 120M-150M shares, or

roughly 20%-25%+ of current public float. From a mechanical-demand

perspective, this is a very large event.

But precisely because the buy demand is large and highly predictable,

the trade can easily become pre-priced, crowded, and vulnerable to

reversal at the close. The most dangerous mistake is to equate "passive

funds must buy" with "the stock must rise in the closing auction." What

must be verified is whether the actual NOII buy imbalance on the

effective-date close still overwhelms active selling, greenshoe supply,

and front-runner exits.

A more robust conclusion is that SPCX inclusion is not a risk-free

arbitrage. It is a crowded, execution-sensitive, event-driven trade that

requires real-time order-flow confirmation. Without final weights, NOII

data, and a reliable execution route, the passive-buying headline alone

is not enough reason to enter.

SOURCES

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[1] Reuters

SpaceX IPO haul rises to $85.7 billion after underwriters exercise

greenshoe

https://www.reuters.com/business/media-telecom/spacex-ipo-raises-857-billion-underwriters-exercise-greenshoe-option-2026-06-15/?utm_source=chatgpt.com

[2] CME Group

The SpaceX Mega-IPO: Why Index Choice Matters

https://www.cmegroup.com/articles/2026/the-spacex-mega-ipo-why-index-choice-matters.html

[3] etf.com

SpaceX IPO: Every ETF That Will Hold SPCX - and When

https://www.etf.com/sections/news/spacex-ipo-every-etf-will-hold-spcx-and-when

[4] SpotGamma

SpaceX IPO Index Inclusion: How Rule Changes for SPY, QQQ, and IWM

Force Index Funds to Sell Stocks and Buy SpaceX

https://spotgamma.com/spacex-ipo-index-changes-spotgamma/