Sulphur up 231% YoY in GSFC's Q1 filing; the biggest results-day gain went to the company that sells it

Between July 23 and August 12, four listed chemicals and fertiliser companies filed their Q1 FY27 numbers, and together the filings describe one event from four different seats. Gujarat State Fertilizers & Chemicals put a number on it: sulphur prices rose 231% year-on-year during the quarter, alongside ammonia up 144%, natural gas up 38% and P2O5 up 30%. DMCC Speciality Chemicals' managing director explained the mechanism — approximately 50% of global sulphur trade transits the Strait of Hormuz, and the disruption to supply has been severe, in his words. Three of the four companies buy these inputs to make phosphatic fertiliser. DMCC sells sulphur chemistry.

The sharpest results-day move of the four came from the company on the selling side of the sulphur trade — and its own management says the gains are inventory-led.

The table splits cleanly along the buy/sell line. The two large phosphatic-fertiliser buyers grew revenue strongly — GSFC filed its highest-ever Q1 sales, with fertiliser sales up 82% on DAP volumes supported by the Government's DAP Special Package — but margins absorbed the input shock: Coromandel's standalone EBITDA fell 15% and its management said subsidy rates remained inadequate to fully offset increased input costs, while GSFC's fertiliser segment EBIT margin fell to 4.09% from 8.49% a year earlier. Paradeep, the third buyer, reported the opposite: revenue up 36% and PAT up 24%, which its press release attributes to supply-chain efficiencies and agile sourcing diversification despite the raw-material escalation. And DMCC, which sells sulphur and sulphuric-acid chemistry, roughly doubled revenue and grew profit after tax 163%.

The rest of the DMCC commentary is equally direct. Goculdas states that with approximately 50% of global sulphur trade transiting the Strait of Hormuz, the disruption to supply has been severe; that the company passed on cost increases fully without losing volumes; and that the pricing environment stretched working capital — receivables and inventory balances have grown materially, managed through short-term borrowings. He calls the results optically strong and not a reflection of what is to come. That is an unusually explicit discount from a management team on its own record quarter, and it is the context for the stock's reaction.

The tape since then has been a slow test of the CEO's caveat. From the ₹313.10 results-day close, DMCC drifted in the ₹278–302 band through early September, slipped to ₹265 on September 15, and closed at ₹298.35 on September 23 — still below the results-day close, and below its 52-week adjusted high of ₹332.90 set on May 8. Paradeep has traced a similar shape: a post-results run to ₹165.88 on August 28, then a fade to ₹154.26 by September 23.

What follows from here is inference, but the filings frame it clearly. If DMCC's management is right that a meaningful portion of Q1 profit was inventory gain, Q2 FY27 is the first quarter that has to stand without it — for the seller and, in mirror image, for the buyers, whose Q2 margins will show whether the pass-through and subsidy arithmetic improved. The buyers' structural answer named in their own filings is backward integration: Coromandel stabilised its Kakinada phosphoric and sulphuric acid plants this quarter, and GSFC lists a phosphoric and sulphuric acid project at Sikka in its capex plan. Both are bets that owning the acid step is worth more when the input is scarce.