WMS Short Sellers Cautious, Not Crowded, Before November Print

Advanced Drainage Systems enters its November 5 results with short interest at a relatively modest 4.1% of the free float, sitting near the middle of its peer group rather than at an extreme, yet the position has grown by 25% over the past month in share terms, making the directional shift worth watching.

Among its closest correlated peers, the borrow market picture is similarly relaxed across the group. BLDR surged 14.2% on the week while MAS added 6.1%, both outpacing WMS's 3.9% weekly gain. SSD rose 4.9% and TREX 1.5%, leaving WMS roughly in line with the sector median of around 4.2%. The company's short interest is not the most crowded in this cohort, but it is one of the few where bearish positioning has been building steadily through October.

The lending market itself carries no alarm signals. Availability is exceptionally wide at roughly 2,500%, meaning there are around 25 shares available to borrow for every one already on loan. Borrowing costs run at 0.56% annualised, negligibly above a month ago. That combination makes short entry cheap and easy, which is consistent with the gradual build in positions rather than a forced squeeze dynamic.

Options traders are not leaning especially hard toward protection. The put/call ratio of 1.68 is modestly below its 20-day average of 1.78, and well clear of the 52-week high of 2.62 reached earlier in October. Analysts are broadly constructive but have been trimming targets: RBC Capital lowered its objective to $170 in mid-October while keeping its Outperform rating, and Oppenheimer similarly cut to $185. With the stock at $135.43, both targets still imply material upside, though the gap between the current price and the $182 consensus target is notable. Bulls point to the company's stormwater franchise, recent EBITDA margin expansion to 35.8%, and the StormTrap acquisition adding roughly 4% to annual EBITDA. Bears flag exposure to cyclical construction demand and the risk that non-residential volumes, nearly half of revenues, disappoint if the building cycle softens further.

Retail attention has picked up ahead of the print. Wikipedia traffic for WMS has been running more than 2.7 standard deviations above its own 90-day average, per ORTEX Alt Data, though this dataset has not been measured to lead the company's financial results and is better read as a gauge of general interest than a signal on the quarter's figures.

The level to watch is whether the month-long accumulation in short positions reflects informed caution about demand trends or simply sector rotation, and the November 5 print will begin to answer that question.