KEY POINTS
- SMH and SOXX absorbed approximately $5.5 billion in April, eclipsing the prior monthly record set in December 2025, with retail buying running at more than double last year's pace.
- The trade has structurally broadened beyond Nvidia, with SOXX outperforming SMH by roughly 300 basis points over the past 30 sessions on heavier exposure to AMD and Broadcom.
- Computex next week and new leveraged semiconductor ETF launches from Defiance and GraniteShares are the next two catalysts that will shape Q3 flows.
Semiconductor ETFs absorbed about $5.5 billion in inflows in April, a record monthly haul split between the VanEck Semiconductor ETF (SMH) and the iShares Semiconductor ETF (SOXX), and the trade has only accelerated as the AI chip rally broadens beyond Nvidia. Retail investors have driven $3.2 billion of net buying into chip funds since January 2025, with the pace more than doubling in 2026. The flows confirm what the price action has been signaling: this is the consensus institutional and retail trade of 2026, and it is no longer a single-name bet.
The Record Month And The Broadening Trade
April's $5.5 billion print eclipsed the prior record set in December 2025, and the buying continued into May. The investment thesis is no longer "buy Nvidia and own everything else as ballast." It is a recognition that AI capex is reshaping every layer of the semiconductor stack at once. Logic, foundry, memory, networking, advanced packaging, and capital equipment are all running at full utilization. Global semiconductor sales hit $791.7 billion in 2025, and the Semiconductor Industry Association projects a $1 trillion year in 2026.
SMH and SOXX deliver that exposure differently. SMH holds roughly 17% in Nvidia. SOXX has about 7% in Nvidia, with larger weights to AMD and Broadcom. The differential is meaningful. After Nvidia's Wednesday earnings, SMH would have absorbed roughly 1.3% of any Nvidia price move on a one-day basis, while SOXX would have absorbed about 0.5%. The post-earnings reality played out cleanly: SMH was roughly flat while SOXX was modestly up Thursday as the rotation favored AMD, Broadcom, and the memory names. VanEck's supply-chain ETF coverage page details how the index construction maps to the AI capex cycle.
The Memory And Custom-ASIC Layer
The most underappreciated leg of the semi ETF trade is memory. SK Hynix, Samsung, and Micron are the three suppliers of high-bandwidth memory, and HBM4 is the gating constraint on every Blackwell 300 and Rubin shipment Nvidia plans to ship through 2027. Samsung is in active negotiations to enter Nvidia's HBM4 supply chain. SK Hynix has finished mass-production preparations and shipped qualifying samples earlier this spring. Micron has surprised to the upside on margin expansion as supply remains tight. The memory names sit inside SOXX and SMH but also feature prominently in the Vanguard Information Technology ETF (VGT) and the iShares Technology Independence ETF, both of which have seen meaningful inflows in May.
The custom-ASIC story is the second layer. Broadcom, Marvell, and Alchip are designing AI accelerators for Google's TPU v7, Meta's MTIA v3, and Amazon's Trainium 3. That work doesn't show up in Nvidia's data-center print. It shows up in Broadcom's AI revenue line, which is tracking toward $20 billion annualized exiting 2026. SOXX's heavier weight to Broadcom is the structural reason it has outperformed SMH by roughly 300 basis points over the past 30 sessions. The ETF.com piece on the broadening semi trade lays out the index composition differences in detail.
Where The Trade Goes From Here
Computex next week will be the next major catalyst. AMD's Lisa Su arrived in Taipei on May 20 ahead of Jensen Huang. Expect MI400 commentary, custom-ASIC partnership announcements, and Rubin specifications to drive the next leg of fund flows. New leveraged products are also coming. Defiance and GraniteShares have filed for 2x-daily leveraged ETFs targeting semiconductors and AI software, which will add fuel to flow data as they list.
For traders, the actionable view is to use SMH or SOXX as the core position and to layer single-name exposure for share-shift bets. AMD captures the share-shift narrative against Nvidia. Broadcom captures the custom-ASIC and networking layer. Micron and the memory names capture the HBM4 supply constraint. The three legs together cover the trade. The risk is concentration: if Nvidia's Rubin ramps faster than expected, single-name leadership could reassert itself and pull SMH back toward NVDA's beta.
Watch the SMH/SOXX ratio. It has trended toward SOXX outperformance as the trade broadens. A sustained reversal back toward SMH leadership would signal Nvidia is reasserting share. Continued SOXX outperformance confirms the rotation is structural. The flows in May suggest the latter, but Computex will deliver the next reset. The semiconductor sector is now a $1 trillion industry priced for another doubling. The flows are validating that thesis. The catalysts to disconfirm it are limited and named. Watch them into June.
