GraniteShares is filing for a YieldBOOST ETF tied to SpaceX, a move that would give retail investors a rare income-generating vehicle linked to the world’s most valuable private company.

The filing is notable for two reasons. First, SpaceX isn’t publicly traded, which means any ETF product would need to use creative structuring to gain exposure. Second, GraniteShares’ YieldBOOST strategy isn’t about capital appreciation. It’s about squeezing weekly income out of volatility, which makes the choice of an illiquid private-company underlier particularly interesting.

What YieldBOOST actually does

Think of it like renting out your parking spot every week. You collect a small payment, but you accept some risk that someone might ding your car. That’s roughly how put-spread selling works.

GraniteShares’ YieldBOOST ETFs generate income by selling put spreads, typically on leveraged ETFs linked to volatile underlying assets. The strategy collects option premiums on a weekly basis, which get distributed to shareholders as income. The trade-off is that investors absorb downside risk if the underlying asset drops sharply.

The suite already covers a range of high-profile names. Tesla, Nvidia, Coinbase, Micron, and Taiwan Semiconductor all have YieldBOOST products. Index-level products tied to the Nasdaq-100 exist as well. GraniteShares CEO Will Rhind has indicated potential annualized yields of roughly 50% for broad index versions and up to 180% for the Coinbase-linked ETFs.

Those numbers sound absurd until you understand the mechanics. High yields in options-income strategies reflect high implied volatility in the underlying, not some magical money machine. The more volatile the asset, the more premium you can collect, but the more likely you are to eat a loss when things go south.

The entire YieldBOOST suite currently manages over $428.2M in assets, a figure that suggests meaningful retail adoption for what is essentially a sophisticated derivatives strategy packaged in an ETF wrapper.

The SpaceX problem

Here’s the thing about SpaceX: you can’t just buy shares on an exchange. The company is privately held, valued in the hundreds of billions, and its equity trades only on secondary markets with limited liquidity and high minimum investments.

That creates a structural puzzle for any ETF issuer. A YieldBOOST SpaceX product would presumably need to find a way to reference SpaceX’s value, whether through pre-IPO share access, secondary market positions, or some kind of synthetic exposure. The mechanics of selling put spreads on an asset that doesn’t have a liquid public options chain are, to put it mildly, non-trivial.

Recent months have seen a broader push to democratize access to SpaceX equity. Several fund managers have explored vehicles that hold pre-IPO SpaceX shares, and the secondary market for SpaceX stock has become increasingly active. A YieldBOOST product would take this a step further by not just offering exposure but attempting to generate outsized income from it.

GraniteShares has followed a pattern with its YieldBOOST launches: identify a volatile, high-profile underlying asset with strong retail name recognition, then build an income product around it. SpaceX checks every one of those boxes. The company sits at the intersection of space exploration, defense contracting, and Elon Musk fandom, three topics that generate enormous retail investor interest.

What this means for investors

The filing signals that ETF issuers are getting more aggressive about bridging the gap between private markets and retail portfolios. For years, the hottest companies in tech have stayed private longer, locking out everyday investors from early-stage gains. Products like this represent an attempt to chip away at that barrier, even if the route is unconventional.

Investors considering a YieldBOOST SpaceX product should understand what they’re actually buying. These are not growth vehicles. They’re income vehicles that happen to reference a growth company. The weekly distributions come from options premiums, not from SpaceX launching more Starlink satellites or winning NASA contracts. If SpaceX’s referenced value drops significantly, the put spreads can result in meaningful losses that dwarf the income collected.

The competitive landscape here is worth watching. GraniteShares isn’t the only issuer experimenting with options-income ETFs. Defiance, Roundhill, and YieldMax have all built products in this space, and the race to offer yield on increasingly exotic underliers has been accelerating throughout 2024 and 2025. A SpaceX-linked product would represent one of the most ambitious entries yet, given the challenges of building derivatives exposure to a private company.

The broader question is whether regulators will be comfortable with the structure. The SEC has historically been cautious about products that offer retail access to private company equity, and layering an options-income strategy on top of that adds another dimension of complexity. How GraniteShares proposes to handle liquidity, pricing, and risk disclosure in the filing will likely determine whether this product makes it to market or gets sent back for revisions.