CORN SPECIALIST · Grain / Global Supply Balance
Z2891 – [C] Corn World Ending Stocks YoY
Shrinking world corn ending stocks force buyers to compete for scarce physical inventory; expanding stocks let supply outrun demand and soften futures.
At a glance
IN-SEASON · ACTIVE
Current reading
+0.320
On the plus-or-minus one scale.
SEASONAL STATE
IN-SEASON · ACTIVE
Signal live year-round on monthly PSD cadence.
Signal state
Moderate POS
Current state across the Tight Stocks / Normal / Loose Stocks regime.
Phase duration
56 sessions
Consecutive trading days in the current phase.
Sample
19 years
Monthly USDA FAS PSD world corn ending stocks, 2007 onward.
As of Nov 03, 2026. Updated nightly.
SIGNAL OVERVIEW
World corn ending stocks are the single cleanest fundamental read on global supply-demand balance. When ending stocks contract year-over-year, buyers compete for scarce physical inventory and futures firm. When they expand, supply outruns demand, inventories build, and futures soften.
This signal reads the USDA FAS PSD aggregate across all producer countries, computes the 12-month YoY percent change, z-scores on a 1260-day rolling window, and sign-inverts so tightening reads POSITIVE (bullish). The historical structure is asymmetric: the loose-stocks regime is a sharper bearish signal than tight-stocks is bullish. Monthly release cadence with roughly a 10-day publication lag.
LIVE CHART
Nineteen years of the sign-inverted world corn ending-stocks YoY composite against CBOT corn forward returns.
What the chart is showing. The dark line in the top panel is the sign-inverted world corn ending-stocks YoY composite on a tanh-bounded plus-or-minus one scale — positive means tightening stocks (bullish), negative means loosening stocks (bearish). The bronze line in the middle panel is the CBOT corn front-month in cents per bushel. The bottom panel tracks the 252-day rolling information coefficient between the composite and corn 60-day forward returns. Dashed horizontal lines mark the plus-or-minus 0.2 moderate and plus-or-minus 0.5 extreme thresholds.
COMPOSITE
+0.320 / tanh
STATE
Moderate POS
PHASE
+0.33
SAMPLE N
4,700+ days
TODAY’S PLAYBOOK READING
STATE
Moderate Pos
STATE AND HISTORY
Composite +0.320, state Moderate POS, 56 trading days running in the current phase. Per-state baselines in the regime table below.
THE GLOBAL BALANCE MECHANISM
When world corn ending stocks contract year-over-year, global balance tightens — supply runs short of demand, buyers compete for scarce physical inventory, and futures firm. When they expand, supply outruns demand, inventories build, and futures soften. The signal sign-inverts raw YoY so tight reads positive (bullish).
HOW TO POSITION
Primary fundamental supply-balance read. Pair with the Corn Weather Drought Composite (US weather supply shock), Corn ENSO/PDO Amplifier (SA climate lead), and Corn Return Skewness Mean-Reversion (price statistics). The four together cover weather / climate / fundamentals / technical.
WHAT THE CHART SHOWS
The composite sits at +0.320. Signal state is Moderate POS, 56 trading days running. See the regime table below for per-state baselines.
TOP INPUTS FIRING
- Primary composite +0.320 State Moderate POS, 56 trading days running in the current phase.
- World corn ending stocks tightening YoY Latest USDA FAS PSD release shows world corn ending stocks contracting year-over-year.
- Daily IC +0.099 p<1e-11 - Grade B+ marginal non-overlap Non-overlap rho +0.200 at p=0.077 across 79 samples — same sign but above strict 0.05 bar. Grade B+.
THE TAKEAWAY
What this means for you today
THE STOCKS CALL
Composite +0.320, state Moderate POS, 56 trading days running. Current direction and per-state baselines are in the regime table below.
THE EMPIRICAL CONTEXT
Per-state forward returns show a monotone pattern in the regime table, with ASYMMETRIC structure — the loose-stocks regime is a sharper bearish signal than tight-stocks is bullish.
THE HONEST CAVEAT
Monthly release cadence means slow signal updates with roughly a 10-day publication lag; a mid-month PSD can move the composite abruptly. Use as a fundamental overlay, not a day-trade.
THE REGIME MAP
The three states, forward returns and sample share
Computed from 4,712 trading days. Baseline Corn fwd60d: plus 0.77 percent. Grade B+ with daily IC +0.099 p<1e-11; non-overlap rho +0.200 p=0.077 (marginal, same sign). 4.04 pp directional spread.
| State | Phase | Share | Fwd 60d | HAC t | Edge vs baseline | Last firings |
|---|---|---|---|---|---|---|
| Tight Stocks TODAY | +1 | 43.4% (2073 d) | +1.76% | +0.99pp | Aug 2026, Feb 2026, Nov 2025 | |
| Normal | 0 | 42.9% (2048 d) | +0.76% | -0.00pp | Jul 2026, Jan 2026, May 2024 | |
| Loose Stocks | -1 | 13.7% (653 d) | -2.28% | -3.05pp | Sep 2025, Jul 2025, May 2024 |
The historical pattern
Signature episodes in the 19-year sample
THE TRACK RECORD
State changes
| State | Start | End | Duration | Fwd 60d C |
|---|---|---|---|---|
| Normal | 10/30/2024 | 07/16/2025 | 177d | +3.76% |
| Loose Stocks | 07/17/2025 | 08/14/2025 | 21d | +3.98% |
| Tight Stocks | 08/15/2025 | 09/12/2025 | 20d | +5.91% |
| Loose Stocks | 09/15/2025 | 11/14/2025 | 45d | +3.35% |
| Tight Stocks | 11/17/2025 | 01/14/2026 | 40d | +2.42% |
| Normal | 01/15/2026 | 02/13/2026 | 21d | +0.32% |
| Tight Stocks | 02/17/2026 | 07/14/2026 | 102d | +8.71% |
| Normal | 07/15/2026 | 08/14/2026 | 23d | +2.53% |
| Tight Stocks | 08/17/2026 | 10/30/2026 | 54d |
Scroll inside the table for the full history. Forward 60-day C is measured from each run’s start date; a reader cannot trade off a start-date they only identify in hindsight, so this is a transparency log, not an alpha claim. Asterisked (*) returns are partial. The run is less than 60 trading days old. The full 60-day comparable fills in as more data arrives.
What this measures
Shrinking world corn ending stocks force buyers to compete for scarce physical inventory and lift futures; expanding stocks let supply outrun demand and soften futures. The composite reads USDA FAS PSD monthly world corn ending stocks aggregated across all producer countries, computes the 12-month YoY percent change, z-scores on a 1260-day window, sign-inverts so tight reads positive, and bounds with tanh. State thresholds plus-or-minus 0.2 (moderate) and plus-or-minus 0.5 (extreme).
Why it matters
Why world ending stocks YoY reads global corn balance
USDA FAS publishes the Production, Supply, and Distribution (PSD) tables monthly as the single cleanest aggregated reading of global corn supply and demand. World ending stocks = beginning stocks + production + imports – total use – exports, aggregated across all producer countries. When ending stocks contract YoY, global balance tightens; when they expand YoY, balance loosens. The YoY trend captures the pace of balance change, which is what forward prices actually track. The signal sign-inverts so tight reads as positive (bullish C) and loose reads as negative (bearish C).
Why Grade B+ with marginal non-overlap
Daily Spearman IC plus 0.099 at p-value 1.2e-11 across 4,712 observations — strongly significant daily. Non-overlap rho plus 0.200 at p-value 0.077 across 79 independent samples — SAME SIGN and strong magnitude but just above the strict 0.05 bar. Grade B+ reflects daily strong + non-overlap marginal same-sign. 4.04 pp directional spread with ASYMMETRIC structure: loose-stocks firing (Phase -1, -3.05 pp edge) is a sharper bearish signal than tight-stocks is bullish (Phase +1, +0.99 pp edge).
How to use this signal today
Primary fundamental supply-balance read. Pair with the Corn Weather Drought Composite (US weather supply shock), the Corn ENSO/PDO Amplifier (SA climate lead signal), and the Corn Return Skewness Mean-Reversion (price statistics). The four together cover weather / climate / fundamentals / technical through orthogonal channels.
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Not investment advice · The analysis on this page is informational and educational. Signal readings, historical case figures, and empirical statistics are derived from publicly available data and are provided without warranty. Hypothetical performance results have inherent limitations, including the benefit of hindsight. Readers who intend to trade should consult a licensed investment professional and see the research brief for the full disclaimer.
Last refreshed Nov 04, 2026 12:46 AM ET