CSM, the ProShares Large Cap Core Plus ETF, is sending mixed signals this week — short interest has lurched higher on a monthly basis even as borrowing costs fall sharply and the lending pool remains comfortably deep.
The most striking data point is the monthly short interest move. SI hit roughly 0.03% of the free float on September 22 — trivially small in absolute terms, but the raw share count has risen more than 500% over the past month from a near-zero base. Day-to-day, the picture is volatile: short shares collapsed 67% in a single session on September 22, after spiking on September 21 and again on September 16. These are tiny absolute positions — around 1,800 shares short as of the latest reading — so the percentage swings are best read as noise around a structurally uncrowded name rather than any directional conviction from short sellers.
The borrow market tells a calmer story. Cost to borrow has eased considerably, dropping to 1.20% from above 2.5% in mid-September and well off the 4.96% peak touched on September 1. Availability is wide open: roughly 4,900 shares remain available to lend against fewer than 1,800 borrowed, putting availability at around 444% — loose by any standard, though sharply tighter than the effectively unlimited readings (listed as 9,999%) seen through much of August and early September. The 52-week minimum availability touched 2.76%, so even the current reading leaves enormous headroom relative to how tight this name has been before.
The ORTEX short score has nudged higher this week, reaching 32.8 on September 22 versus readings in the 26-27 range that persisted for most of the preceding fortnight. That uptick reflects the recent short interest increase, but the absolute score remains well below levels typically associated with meaningful short pressure. For a systematic long-short ETF like CSM — which holds long positions in analyst-upgraded large caps and shorts downgraded names within its own portfolio — short interest on the wrapper itself is rarely a primary signal. The fund's embedded short overlay is structural, not driven by external short sellers targeting the product.
Dividends are the clearest recurring event for CSM. The fund paid $0.228 per share in June 2026, up from $0.213 in March, reflecting a modest step-up in distributions. Options data for this ticker is stale, with the last meaningful activity dating back to January 2026, and no analyst coverage or valuation multiples apply to an ETF wrapper. The stock gained 1.65% on the week to close at $88.55, essentially flat on the month.
The next distribution announcement — likely around December — is the most concrete event on the calendar, while any sustained pickup in short interest on the wrapper itself would be worth watching given how quickly it has reversed in recent weeks.
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