The PBD Invesco Global Clean Energy ETF heads into mid-May with a striking contradiction: short sellers are closing positions at pace, yet the cost to borrow has tripled in a week — a split signal that makes the lending market worth watching.
The borrow story is the lead here. Cost to borrow has surged from 2.41% on May 5 to 7.57% on May 12 — a 214% jump in a single week and the highest level in the 30-day dataset. That is not the behaviour of a market with abundant lending supply. Availability has tightened materially alongside: the borrow pool is now meaningfully less accessible than it was a fortnight ago, when costs were still hovering around the 3% range. A CTB of 7.57% is not extreme in absolute terms, but the velocity of the move — tripling in one week — tells you demand for borrows rose sharply even as short interest itself was falling.
That paradox is the positioning story. Short interest dropped 67% over the week to just 1.27% of the free float, with the sharpest move coming between May 8 (301k shares) and May 12 (114k shares). The ORTEX short score, which peaked at 61 in early May, retreated to 47 by May 12 — consistent with the unwind in positions. Yet the spike in CTB suggests the remaining shorts, or new entrants attempting to build positions, are finding borrow harder to come by even as net short interest shrinks. The 52-week peak for lending availability was 93.35%, reached earlier in the year; the current reading has pulled well back from that. This kind of cost spike in a low-SI environment often reflects a temporary imbalance — perhaps a large holder pulling shares from the lending pool — rather than a structural squeeze.
Options positioning adds a mild note of caution. The put/call ratio is running at 0.046, above its 20-day mean of 0.029 and roughly 1.4 standard deviations elevated. In absolute terms, options activity on PBD is thin — the 52-week range runs from 0 to 17 on the PCR, which signals how rarely this ETF draws serious derivatives interest — but the recent drift higher in the ratio reflects slightly more demand for downside protection than has been typical this month. It is not a dramatic signal, but it rhymes with the broader caution in the lending market.
The price action adds context. PBD rose 14% over the past month to $21.45, a strong run driven in part by the broader recovery in risk assets. That 1-day pullback of 3% on May 12 may partly explain why short sellers cut exposure so aggressively last week — the fund had moved considerably against them. Global clean energy ETFs have no earnings calendar to anchor around, so macro and policy flows dominate: broader ETF fund flow data shows utilities-sector funds saw net outflows this week, while energy broadly was only marginally positive. Global-mandate products like PBD sit in a contested space between those two categories.
What to watch: whether the cost-to-borrow elevation persists or snaps back now that short interest has been largely cleared, and whether Tuesday's 3% dip marks the start of a re-test of the recent range or a brief pause in the recovery trend.
See the live data behind this article on ORTEX.
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