Cathie Wood Piles Into SpaceX While Trimming Tech Stocks

ARK Invest's daily trade disclosures for the week of August 17 to 21, 2026, showed SpaceX (NASDAQ:SPCX) as the single largest purchase while seven tech and biotech names were simultaneously cut.

Cathie Wood bought SpaceX across four ETFs during a period when the stock traded near $134, roughly 41% below its 52-week high of $226. Moves of this size by a fund manager known for concentrated bets are often among the clearest signs of financial success or risk in an actively managed strategy, and the specifics are worth examining.

205,031 SpaceX shares purchased across four funds on August 21

ARK bought 205,031 SpaceX shares on August 21 alone, split across ARKK with 121,294 shares, ARKQ with 35,941, ARKW with 33,381, and ARKX with 14,415, Crypto Times reported. SpaceX traded near $134 on August 21, 2026, giving the company a market capitalization of approximately $1.77 trillion.

The purchase came a day after a share unlock on August 20 that pressured the stock lower, a pattern consistent with ARK's approach of adding on dips in names Wood considers core innovation holdings. SpaceX listed on the Nasdaq on June 12, 2026, and has traded between $105 and $226 since its debut.

SpaceX is now ARKK's second-largest holding

As of August 21, SpaceX ranked as ARKK's second-largest holding at approximately 5.98% of the fund, behind Tesla Inc. (NASDAQ:TSLA) at 9.16%. Tempus AI Inc. (NYSE:TEM) ranked third at approximately 5.21%.

Together, those three holdings represented roughly 20% of ARKK's portfolio, illustrating the fund's concentrated approach.

Seven names trimmed during the same week

ARK reduced positions in seven stocks during the August 17 to 21 trading week, Investing.com confirmed.

• Roblox Corp. (NYSE:RBLX), with ARKK selling 26,616 shares on August 21.
• Palantir Technologies Inc. (NASDAQ:PLTR), with roughly 156,000 shares sold across four funds on August 21.
• Advanced Micro Devices Inc. (NASDAQ:AMD), trimmed across multiple sessions.
• Shopify Inc. (NYSE:SHOP), 10x Genomics, Twist Bioscience, and Illumina also reduced.

The Palantir sale stood out as the single largest daily trade by share count on August 21, with ARKK alone selling 92,366 shares. ARK has been reducing Palantir consistently since early August.

Cerebras, Nvidia, Broadcom, and BWX Technologies rounded out the buys

ARK purchased 106,941 Cerebras Systems (NASDAQ:CBRS) shares on August 13, worth $28.02 million, buying into a post-earnings selloff after the company beat estimates but reported margin compression, Yahoo Finance reported. Nvidia and Broadcom were also added throughout the week.

Nuclear-components maker BWX Technologies Inc. (NYSE:BWXT) received 69,979 shares across three funds on August 21, and Cloudflare Inc. (NYSE:NET) was added as well. The breadth of the buy side spans AI chips, nuclear infrastructure, and cybersecurity, suggesting ARK sees opportunities across multiple sectors beyond aerospace.

The rotation from software margins toward capital-intensive buildout names

Roblox, Palantir, Shopify, and AMD are all software or chip-design businesses with high gross margins and relatively low capital requirements. SpaceX, Cerebras, and BWX Technologies are capital-intensive operations that require heavy upfront infrastructure investment before generating consistent returns.

ARK's portfolio now allocates roughly 31.4% to information technology and 31.9% to industrials and aerospace, a nearly even split that reflects Wood's conviction that the infrastructure buildout phase of AI and space offers better risk-reward than the software layer built on top of it.

ARKK gained 3.21% in the first half of 2026 versus 9.34% for the S&P 500

ARKK returned 3.21% during the first six months of 2026, significantly trailing the S&P 500's 9.34% gain over the same period, Blockonomi noted. Among ARK's fund family, only ARKX at 13.66% and ARKQ at 11.63% managed to outperform the broader index during that stretch.

ARKK lost more than 75% of its value from its February 2021 peak to its December 2022 low before recovering a portion of those losses. The fund's history of sharp drawdowns followed by strong recoveries makes the timing of your entry and exit particularly important relative to a buy-and-hold index approach.

Risks of holding a fund where three names make up 20% of total assets

A roughly 20% concentration in Tesla, SpaceX, and Tempus AI means roughly one-fifth of your ARKK exposure depends on three companies performing well simultaneously. SpaceX in particular is only months into its life as a public company and carries execution risks around Starlink, AI infrastructure spending, and launch operations.

You may also want to consider that ARK's actively managed approach means positions change frequently. Stocks bought during one week may be trimmed the next, and the fund's daily trade disclosures sometimes show conflicting signals within the same month.

Bottom line

Wood made SpaceX the centerpiece of ARK's August 17 to 21 trading week, buying over 205,000 shares in a single session while cutting exposure to Palantir, Roblox, AMD, and four other names. The rotation reinforces ARK's shift from high-margin software toward capital-intensive infrastructure plays in AI, space, and nuclear.

Evaluating whether concentrated, high-volatility funds like ARKK belong in a retirement portfolio is a question to answer before you start investing additional capital alongside a manager whose results have historically swung between extremes. ARKK's 3.21% first-half return versus the S&P 500's 9.34% gain provides context, and the next earnings cycle may determine whether the SpaceX-heavy approach narrows or widens that gap.

This article is for informational purposes only and should not be considered investment advice.

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