Ark Invest’s ARKK tops $15.4 billion in assets after a quarter of heavy concentration, with Tesla, AMD and a new SpaceX stake

Cathie Wood’s Ark Invest grew the asset base of its flagship innovation-focused exchange-traded fund during the last quarter, pushing the portfolio to about $15.4 billion, according to a market recap published this week.

The report says Tesla and AMD are still among the fund’s largest holdings. It also describes a new stake in SpaceX, estimating that SpaceX accounts for roughly 18% of Ark’s ARKK assets, a concentration level that would make the fund unusually sensitive to developments tied to a single private company.

The recap frames the buy-and-add strategy as a deliberate bet on “disruptive innovation,” an approach Ark has used for years across its Ark ETFs. In this case, the article’s headline question is whether such concentration can keep paying off as the fund’s largest positions inevitably dominate performance.

For AMD specifically, the inclusion in the largest-holders list indicates that Ark continues to treat the semiconductor designer and its ecosystem of chips, accelerators, and data-center processing as a central pathway to its broader thematic thesis about computing power and AI-related infrastructure. The report does not provide AMD-specific transaction details, so it is unclear from the account whether AMD was increased, reduced, or simply remained a top holding over the quarter.

Tesla’s continued prominence is part of the same thematic framework, tying the fund to electric vehicles, energy, and battery-related supply chains. As with AMD, the market recap does not describe the pace or timing of trading in Tesla during the quarter, but it highlights Tesla as another position that can swing overall results given its size in the portfolio.

Ark’s concentration raises a basic portfolio-management issue that market participants often debate with themed, high-conviction ETFs: when only a handful of names make up a large share of assets, both upside and drawdowns can be amplified. The article’s framing implies that the biggest question is not whether the companies are interesting, but whether the timing and weighting are consistent with the pace of execution in each sector.

Still, the post offers limited operational detail. It does not lay out the exact dates of purchases, the dollar amounts added or trimmed, or the specific methodology used to compute the concentration estimate for SpaceX. It also does not provide any discussion of valuation changes for any of the top positions, which means readers are left to judge the quarter’s outcomes largely through the lens of asset growth and the reported weight of major holdings.

What to watch next is whether Ark provides more transparency in subsequent disclosures around ARKK’s top holdings and whether performance and flows respond to the fund’s largest additions. Investors also will likely look for whether the SpaceX stake grows further, stabilizes, or is rebalanced as new information emerges across technology and aerospace timelines.