Tema Memory ETF (DISK)

On our desk, we are closely tracking the massive expansion in short interest for the Tema Memory ETF (DISK). With short interest surging by over 1,564% in July to hit 59.8% of total shares, market participants are aggressively positioning against the fund. Even though DISK targets the core AI memory bottleneck—spanning HBM, DRAM, and NAND—the convergence of stretched valuations, price pushback, and CXMT's massive Shanghai debut has triggered intense bearish speculation.

From a quantitative angle, DISK's trading range between a 52-week low of $28.35 and a high of $50.46 reflects intense volatility in the semiconductor sector. Trading around $33.85 with an average volume near 420K-520K shares, the active management structure without an underlying index allows flexibility, but also introduces tracking and execution variables that quants must factor into their short-term risk models.

As a hedge fund PM, evaluating DISK requires separating commodity DRAM pressures from high-bandwidth memory fundamentals. While Wall Street dumped memory names following China's ChangXin Memory Technologies IPO, CIO Yuri Khodjamirian notes that technological edges for leaders like Micron, SK Hynix, and Samsung remain intact. However, with AUM hovering around $24M to $43M and a 0.75% expense ratio, liquidity dynamics and the 2.4-day-to-cover ratio warrant strict risk management.

As a risk manager, I am alarmed by the sheer velocity of short selling in DISK during July 2026. Going from roughly 74K shares short to over 1.23M shares in a matter of weeks signals that short sellers are heavily targeting memory exposure amid fears of oversupply and rising Chinese competition. Investors must weigh the multi-year structural tailwinds of memory shortages against explosive near-term downside pressures.

Watching the macro backdrop, the narrative around DISK is heavily influenced by how investors interpret the AI Supercycle. While GPUs get the lion's share of attention, memory is the true bottleneck constraining execution speed. Yet, broader market jitters—including Brent crude holding above $90 and shifting interest rate expectations—are causing capital to rotate rapidly, impacting thematic tech ETFs like DISK.