The retreat in UNG short interest that defined last week's note has gone into reverse — shorts are rebuilding positions even as the fund posts its strongest weekly gain in months.
The turnaround in positioning is sharp. Seven days ago this column described short interest falling 43% in a single week and availability loosening to above 570%. Both readings have since swung hard in the other direction. Short interest climbed 15% over the past week to 6.88% of free float — adding roughly 339,000 shares in two sessions alone on September 21-22. On a one-day basis, SI jumped 11%. The month-over-month picture still shows a 17% net decline, reflecting the deeper unwind from August highs near 5.3 million shares, but the directional story has clearly reversed.
The borrow market confirms the rebuilding. Availability has tightened from above 570% — the loose reading flagged in last week's note — all the way to 110%, a fall of 81% in a week. That is still in normal territory (above 100%), meaning there is roughly one share available for every one already borrowed, but the speed of the tightening stands out. Cost to borrow has risen 28% over the week to 0.86% annually. That remains low in absolute terms — this is nowhere near a distressed borrow — but the direction is consistent: shorts are coming back in, and the lending pool is absorbing the demand. The 52-week low in availability was 2.4%, hit earlier this year, so the market is far from squeezed. What has changed is the trajectory.
Options traders have not followed the shorts back in. The put/call ratio has actually drifted lower over the week to 0.29, sitting below its 20-day mean of 0.32 and close to the 52-week low of 0.24. That is the opposite of a defensive tilt — calls are dominating flow, not puts. The z-score of -0.84 confirms the reading is modestly below the recent norm rather than at an extreme. Options positioning, in other words, still reads bullish, which makes it the clearest divergence from the short-side rebuild.
The ORTEX short score sits at 57.2 on September 22, up sharply from a mid-week trough of 36.1 on September 17. That intraweek swing — from below 40 to above 57 — reflects how quickly the picture can shift for a commodity-linked ETF. The score is back roughly where it was in early September, when short interest was also running near current levels before a brief flush lower mid-month. The price of UNG itself rose 5.8% on September 22 alone, closing at $10.86, and is up 3% on the week and nearly 9% over the past month. Shorts rebuilding into that kind of price momentum is the core tension here.
Institutional positioning is light, as expected for a commodity ETF. Goldman Sachs is the largest reported holder at just over a million shares, or 2.1% of shares outstanding — a position unchanged as of June 30. Quadrature and UBS added to positions in the same period. None of these are particularly high-conviction reads on near-term direction; they reflect the fund's role as a trading vehicle rather than a long-term holding.
The next read worth watching is whether the borrow market continues tightening toward the sub-50% availability levels last seen in the compressed episode earlier this year, or whether the fresh short interest — added into this week's rally — starts to come back off if natural gas prices hold their gains.
See the live data behind this article on ORTEX.
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