PSX Shorts Jump 26% in a Week as Earnings Hit the Stock Hard

Phillips 66 just printed earnings on October 28 and the stock fell 7% on the day, dropping to $268.53. Short sellers had already started rebuilding positions before the release.

Short interest climbed 26% over the past week to 6.95 million shares, or 1.72% of the free float. That weekly move is roughly 2.4 standard deviations above the typical weekly change for PSX over the past year. The build was concentrated in the back half of the week: shares short had been running near 5.5 million through mid-October before jumping sharply from October 23 onward. On a 30-day basis, the position is up nearly 18%, reversing a decline that had taken short interest to its lowest levels in the period. The ORTEX short score has ticked up to 31.0, its highest reading in the 10-day window, though still a modest absolute level.

Despite the increase in borrowed shares, the borrow market remains extremely relaxed. Availability is at roughly 9,237%, meaning lenders hold more than 300 million shares available against the roughly 6.9 million currently lent out. Cost to borrow holds at 0.39%, barely moving on the week. There is no squeeze dynamic here: the lending pool is so deep that the short buildup reads as a directional view on the stock, not as a forced or constrained position. Options traders have shifted alongside. The put/call ratio fell to 0.85, actually more call-skewed than its 20-day average of 0.91, sitting about 1.2 standard deviations below that mean. The options market is therefore not confirming the short buildup with defensive hedging.

The analyst picture is mixed and the divergence matters. Multiple firms raised price targets in the two weeks before earnings, with Wells Fargo moving to $345 (Overweight), TD Cowen lifting to $308 (Buy), and Citigroup stepping from $217 to $297 while holding Neutral. Mizuho had been the exception, downgrading to Neutral while raising its target to $300. The formal consensus, held at sell by just two ratings, does not reflect the preponderance of constructive target-setting from the rest of the Street. Valuation multiples shifted on the week: the PE dropped from around 9.4 to 8.7 as the share price fell faster than earnings estimates moved. EV/EBITDA also compressed, landing at 6.8, down roughly 1.3 turns over the past 30 days. EPS momentum factor scores rank in the 90th to 92nd percentile, pointing to strong recent estimate revision trends, though the 12-month forward earnings growth score sits at just the 32nd percentile.

The sell-off on earnings day left PSX with a slightly better relative outcome than most of its peers. MPC fell 7.4% on the day and 8.2% on the week. VLO dropped 9.2% on the day and 10.6% on the week. PBF fell 8.6% on the day. The sector move was broad and steep, suggesting macro or margin-level concerns rather than company-specific disappointment as the primary driver. Elliott Management remains on the register as a significant holder at 4.8% of shares as last reported at June 30, though this disclosure predates the current quarter. A separate Schedule 13D filed by "Link Co" in April 2026 disclosed a 10% stake, though that filing appears to reflect a single event with no subsequent amendments; stakes are as-last-disclosed around the 5% threshold, and a holder can fall below that level without filing again.

The next earnings date is February 1, 2027. Between now and then, the key data points to track are whether short interest continues to build past the one-month highs established this week, whether analyst targets adjust downward following the earnings reaction, and how refining margins evolve into year-end given the sector-wide pressure visible across PSX's closest peers this week.