PDBC — the Invesco Optimum Yield Diversified Commodity Strategy No K-1 ETF — has seen a sharp and sudden shift in its lending market this week, with borrow availability collapsing just as short interest hits its highest level in months.
The lending story is the standout here. Availability dropped to roughly 45% by August 4 — meaning fewer than one share remains available for every two already borrowed. That is down from nearly 256% just the day before, and a world away from the essentially unlimited availability (readings above 9,000%) seen in early July. The move is striking in its speed. Short interest more than doubled in a single session on August 4, reaching around 8.6 million shares, and has risen more than 1,300% over the past month. Borrowing costs have followed the borrow demand higher, climbing to 0.82% — up 51% on the week and more than 250% over the past month. The absolute cost remains low by most standards, but the direction is unambiguous. The ORTEX short score has jumped from around 30 at the end of July to just under 50 now, reflecting the rapid build in borrow demand.
Options positioning tells a calmer story. The put/call ratio is running at 1.47, slightly below its 20-day average of 1.53 and about one standard deviation lower than that mean. For context, the PCR touched above 2.0 in late June and has been drifting down since. Options traders are not adding to the cautious tilt — if anything, hedging demand has eased modestly over the past few weeks, even as the borrow market tightened sharply this week. The two signals are pointing in different directions, which makes the borrow surge harder to interpret as simple macro hedging.
The price backdrop adds another layer of complexity. PDBC fell 2% on August 4, pulling back from a month that had otherwise been strong — up 6.5% over 30 days. The ETF's broad commodity basket, spanning energy and agricultural futures, had been a beneficiary of the recent rally in crude and grains. A short interest spike of this magnitude in a commodity ETF often reflects institutional hedging of correlated long positions rather than a directional short thesis, and with availability still above the 52-week low of 28%, there is room for the borrow market to tighten further before it becomes genuinely stressed.
Analyst and valuation data are not available for this ETF structure, and the dividend history is stale. The next session to watch is whether the availability reading holds near 45% or drops further toward the 28% floor seen at the tightest point of the past year — that level, combined with the pace of the short interest build, will indicate whether the borrow squeeze is broadening or stabilising.
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