Sanmina Corporation enters the back half of September with an awkward combination: a sharp weekly pullback, rising short interest, and the next earnings catalyst still seven weeks away.
The stock dropped 7.6% on the week to close at $199.56 — a meaningful reversal after a month that was broadly flat. The move wasn't isolated. The entire electronics manufacturing services cohort pulled back hard: FLEX fell 6.3% on the week, JBL shed 5.8%, and TTMI gave up 6.7%. Sanmina's decline was in line with the peer group, which suggests macro or sector-level pressure rather than any company-specific break.
The more interesting development is what's happening beneath the surface in short positioning. Short interest has climbed steadily since early September — up 12.4% on the week and 22.5% over the past month — reaching 3.3% of the free float. That's not a crowded short by any measure, but the direction of travel is clear and the pace has accelerated. The rebuild began around September 9, when shares jumped from roughly 1.6 million to 1.8 million in a single session and have held there since. Despite the rise in borrow demand, the lending market remains wide open: availability is effectively unconstrained, and cost to borrow is running at just 0.43% — barely above the general collateral rate. Shorts face no squeeze pressure at current levels. Options traders are slightly less bearish than usual; the put/call ratio of 0.53 is running about 1.6 standard deviations below its 20-day average of 0.57, suggesting call positioning is relatively elevated even as the stock pulls back.
The Street's read on Sanmina is mixed, and the most recent analyst data is now about eight weeks old — worth flagging given how much the stock has moved since then. JP Morgan lowered its target from $275 to $260 in late July after the quarter, maintaining a Neutral rating. At $199.56, that $260 target implies roughly 30% upside, though the stock traded above $265 as recently as May — so the target represents less of a stretch call and more of a placeholder. Factor scores tell a nuanced story: EV/EBIT ranks in the 70th percentile and days-to-cover ranks 79th, suggesting the stock screens reasonably on value and short-duration metrics. However, forward earnings momentum is softer near-term — the 30-day EPS momentum rank is just 36 — even as the 12-month forward year-on-year EPS growth rank sits at an impressive 85th percentile. The stock is cheap on a trailing earnings basis at 14.6x PE and 8.0x EV/EBITDA, but the near-term earnings revision trend is working against it.
The last earnings print is worth keeping in mind. Sanmina reported Q3 results on July 27, and the stock fell 17.3% the following day before recovering partially — ending the five-day window down 7.3%. That kind of reaction leaves a mark on positioning: it's the most likely explanation for the short rebuild that began shortly afterwards, and for the $27 million of insider selling that CEO Jure Sola executed in early May at prices between $219 and $229. The insider register is entirely one-directional over the past 90 days — all sales, no purchases — though the bulk of the activity was conducted under 10b5-1 plans and therefore pre-scheduled rather than discretionary. FMR (Fidelity) remains the largest holder at just under 15% of shares, and actually added to its position through August, which provides some institutional anchor.
The next print is scheduled for November 5. Between now and then, the question is whether the short rebuild continues as the stock approaches or retests its post-earnings lows, or whether the wider sector recovery pulls Sanmina back toward the analyst consensus before the bears can press their case further.
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