Signal read: three linked events inside 72 hours — precision strikes on Iranian nuclear sites (02-28), an Iranian missile barrage at the US Al Udeid base in Qatar (03-01), and QatarEnergy declaring force majeure at the QAFCO ammonia/urea complex (03-02). QAFCO is one of the world's largest single-site urea export complexes and Qatar's gas-to-urea chain feeds India, Brazil and the US Gulf import market. Every ton that does not leave Mesaieed has to be replaced by a producer with its own gas — which is the US nitrogen complex. Six US-listed fertilizer names screened; two are direct substitutes for Qatari urea and ammonia, two are diluted or levered versions of the same trade, and two (CVR Energy, Mosaic) are in the table only to show why they are not the way to play it.

Read on each name:

• CF Industries (CF) — US nitrogen leader · direct QAFCO urea/ammonia substitute. The largest nitrogen producer in North America, running six US 1 and two Canadian 2 manufacturing complexes on North American natural gas. FY2025 nitrogen sales were $7.08B 3 at an average selling price of $372 per ton, up from $313 in 2024 4 — pricing was already inflecting before the shock. The 10-K is explicit that profitability is set by the spread between its gas cost and the marginal producer's; a Gulf outage widens that spread directly. Q4 2025 revenue +22.8% YoY , FY2025 net margin 20.5% . Lowest-leverage name in the group — room to keep buying back stock as urea holds.

• CVR Partners (UAN) — Urea/UAN pure-play LP · small-cap nitrogen substitute. Two plants — Coffeyville, Kansas (pet-coke gasification, the only such nitrogen plant in North America) and East Dubuque, Illinois (natural gas) — producing ammonia and upgrading most of it to UAN, sold wholesale into the US corn belt. FY2025 revenue $606.0M , net income $98.7M . Q4 2025 realized prices were already up sharply — UAN $355/ton (+55% YoY) and ammonia $626/ton (+32%) — per the February results release. Small float and an MLP payout model: the highest torque to a UAN spike, and the least cushion if it reverses (Q4 2025 revenue was −6.1% YoY on lower volumes ).

The other four:

• Nutrien (NTR) — the diversified way in: FY2025 revenue $26.9B at an 8.4% net margin, but potash, phosphate and retail dilute the nitrogen exposure to a fraction of the group. Q4 revenue +5.1% .
• LSB Industries (LXU) — the levered small-cap version: ammonia, UAN and ammonium nitrate on US gas, FY2025 revenue $615.2M at a 4.0% net margin. Q4 revenue +22.3% shows the pricing tailwind arriving, but the balance sheet is the weakest of the six — highest torque, least room for error.
• CVR Energy (CVI) — owns roughly 37% of CVR Partners, but the group is a refiner first: FY2025 revenue $7.16B at a 0.4% net margin . Fertilizer upside is swamped by crack spreads.
• Mosaic (MOS) — phosphate and potash, and a buyer of ammonia for DAP production; a Qatar outage is a cost headwind, not a tailwind. Q4 revenue −7.5% . Screened out.

Neither NTR nor LXU is a like-for-like substitute for Qatari urea; CF and UAN are. The live signals to watch are the TTF–Henry Hub spread, Indian urea tender prices, and whether Hormuz shipping insurance normalises; the first two moving against US producers is the tell that the arbitrage is closing.

What would change the thesis: a fast restoration at QAFCO or a de-escalation that reopens Gulf gas flows collapses the European and Asian gas premium, narrows the feedstock advantage US producers currently enjoy, and pressures urea — hitting UAN's distribution coverage first, CF's buyback pace second.

Sources: CF Industries Holdings Form 10-K, FY2025 (filed 2026-02-25); CVR Partners Form 10-K, FY2025 (filed 2026-02-18) and Q4 2025 results release (Form 8-K, 2026-02-18); news_search (theme: middle_east_conflict) for the 2026-02-28 → 03-02 event chain; price_volume_history for the 2026-03-02 closes; FY2025 results for Nutrien, LSB Industries, CVR Energy and Mosaic.