Cathie Wood's ARK buys Tempus AI stock, sells Tesla and Roblox

On May 28, 2025, ARK ETFs significantly increased their position in Tempus AI Inc (TEM), purchasing 251,080 shares worth $16.5M, while reducing holdings in Tesla (TSLA) by 15,817 shares ($5.7M) and Roblox (RBLX) by 67,261 shares ($5.7M). ARK also increased its exposure to the aerospace and lunar exploration sectors, adding to positions in L3Harris Technologies (LHX), Iridium Communications (IRDM), and Intuitive Machines (LUNR), while making adjustments in biotech, increasing Illumina (ILMN) and Twist Bioscience (TWST) and decreasing Adaptive Biotechnologies (ADPT).

Analysis

ARK ETFs executed several strategic trades on May 28th, 2025, underscoring a dynamic portfolio rebalancing, particularly within the technology and biotech sectors. The most substantial move was a significant investment in Tempus AI Inc (TEM), with ARKK and ARKG collectively acquiring 251,080 shares valued at $16,538,639, reflecting high conviction as indicated by a +0.5 sentiment score for TEM. Conversely, ARK reduced exposure to high-profile technology names, selling 15,817 shares of Tesla Inc (TSLA) for $5,739,831 and 67,261 shares of Roblox Corp (RBLX) for $5,746,107; both stocks carry a -0.5 sentiment in this context. The ARKQ ETF demonstrated increased interest in aerospace and related communications, purchasing 2,902 shares of L3Harris Technologies Inc (LHX) for $719,405 (sentiment +0.4) and 8,538 shares of Iridium Communications Inc (IRDM) for $223,951 (sentiment +0.4). Notably, ARKQ continued its accumulation in lunar exploration, adding 134,023 shares of Intuitive Machines Inc (LUNR) worth $1,694,050, a stock with a strong +0.7 sentiment. In biotechnology, ARKG bolstered positions in Illumina Inc (ILMN) with 1,658 shares ($135,252, sentiment +0.4) and Twist Bioscience Corp (TWST) with 15,711 shares ($462,060, sentiment +0.4), while significantly divesting from Adaptive Biotechnologies Corp (ADPT) by selling 319,981 shares for $2,924,626, reflecting a strong negative sentiment of -0.7 and a continued exit. Smaller divestments included 1,459 shares of UiPath Inc (PATH) and 7,900 shares of 3D Systems Corp (DDD), both with negative sentiment scores (-0.4). These transactions collectively signal ARK's active management, prioritizing specific AI, aerospace, and biotech opportunities while trimming positions in certain large-cap tech and underperforming biotech holdings.

Key Decisions for Investors

• Investors should note ARK's strong bullish signal on Tempus AI (TEM) and Intuitive Machines (LUNR) given the significant capital allocation and positive sentiment, potentially warranting further due diligence on these names.
• The substantial reductions in Tesla (TSLA) and Roblox (RBLX), alongside the continued divestment from Adaptive Biotechnologies (ADPT), suggest a cautious or bearish outlook from ARK on these specific stocks, which may prompt a review of existing positions.
• Consider monitoring ARK's increasing exposure to niche aerospace (LHX, IRDM) and specific biotech plays (ILMN, TWST) as potential indicators of emerging sector-specific conviction, while being mindful of reduced allocations in other areas.