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ARM vs RIVN — which is the better buy? — what our data shows

⚡ TradesZ research ·Updated July 21, 2026 ·~2 min read ·Grounded in SEC data

ARM and RIVN are both riding big tech waves — AI chips and electric vehicles — but the data we have on each one tells a pretty different story. One has a lot of serious money behind it, and the other is still finding its footing.

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What our data shows

Arm Holdings plc American Depositary Shares logo ARM Arm Holdings plc American Depositary Shares 🟢Bullish lean
Over 830 big professional investment funds have reported owning ARM — including household names like Berkshire Hathaway — which means the smart money crowd has been paying close attention to this AI chip designer.
🐋 13F · 831AI compute
Rivian Automotive, Inc. Class A Common Stock logo RIVN Rivian Automotive, Inc. Class A Common Stock ⚪Neutral
Our data ties RIVN to exciting themes like batteries and robotics, but we don't see the same wave of major institutional fund backing that ARM has, so the conviction from big investors isn't as visible here.
BatteryRobotics

The takeaway

⚪Neutral

If you care about big institutional investors already showing up, ARM has a much stronger signal there; RIVN is more of a theme play on batteries and robotics without that same crowd of backers in our data yet.

But watch out
Smart-money signals lag the market (13F filings ~45 days) and never guarantee direction — always check the latest price and news yourself.
Sources → Smart-money hub
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Informational research, not personalized investment advice.