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Martin Marietta Materials Inc.
Basic Materials · Building Materials
Made on Aug 27, 2026
Price at call $528.61
6-month call Bear -8.6%
Target by Feb 2027 $483.00
Great value below $400.00
Model v0.6.0

Projection vs Actual (6M history + forecast)

The masterbrain's trajectory (blue, curved through its 7 checkpoints), the deterministic v0.3 control (dashed), and the actual price (green) overlaid from the prediction date forward.
Forecast Change -8.6% to $483.00
Predicted High $530.00 in 2 weeks
Predicted Low $483.00 at 6 months
Max Drawdown (predicted) -8.6%

Forecast

The masterbrain trajectory — 7 dated checkpoints. Short rungs (2w, 1m) show the typical range as the primary claim; point calls run from 2 months out. Every claim still gets graded. Predicted Aug 27, 2026 1:16 pm
Bear MLM trends lower to $483.00 (-8.6% from $528.61) by Feb 2027. decay
ThesisMLM trades well above composite fair value ($324) with a negative value lens and fading momentum, but a risk-on tape, low beta, and no near-term earnings catalyst limit downside velocity. Expect a slow drift lower toward the deterministic baseline as value gravity outweighs a neutral-to-soft sentiment backdrop.
Invalidated ifA break above $560 on strong volume or a materials-sector risk-on breakout would invalidate the drift-lower thesis.
Checkpointtime after the call Datewhen it gets graded Predictedthe claim: closing price Current priceactual close — fills in over time Predicted returnpredicted vs $528.61 at call Conv.brain's confidence, 1–10 Driverwhy the brain put the point here
Prediction made Aug 27, 2026 — $528.61 at call — —The anchor — every point below is measured from this price and date.
2 weeks Sep 10, 2026 $492.81–$564.41 typical range · internal point $530.00 — ±6.8% 6/10 Risk-on tape and recent M&A close support near term
What actually happened: closed $502.99 on Sep 9, 2026 = -4.9% vs the call (predicted +0.3%)  ·  direction HIT (called flat, was flat)  ·  off by 5.1 pp  ·  accuracy 8/10  ·  typical range ±6.8%: inside the band  ·  S&P -1.2% over the same window — lagged it
1 month Sep 27, 2026 $476.73–$580.49 typical range · internal point $524.00 — ±9.8% 5/10 Momentum fade begins, no catalyst to lift
What actually happened: closed $484.30 on Sep 25, 2026 = -8.4% vs the call (predicted -0.9%)  ·  direction MISS (called flat, was down)  ·  off by 7.5 pp  ·  accuracy 4/10  ·  typical range ±9.8%: inside the band  ·  S&P +0.2% over the same window — beat it
2 months Oct 27, 2026 $515.00 — -2.6% 5/10 Value gravity pulls lower without earnings catalyst
3 months Nov 27, 2026 $505.00 — -4.5% 4/10 Priced-for-perfection concerns weigh on multiple
4 months Dec 27, 2026 $495.00 — -6.4% 4/10 Year-end positioning trims extended cyclicals
5 months Jan 27, 2027 $488.00 — -7.7% 4/10 Drift toward deterministic baseline continues
6 months Feb 27, 2027 $483.00 — -8.6% 4/10 Converges near baseline as fair-value gap persists

Why ranges on the short rungs? A 102-prediction trial (2026-07-21) showed 2-week point calls carry no information here — three prompt formulations all lost to simply predicting zero — while the stock's own volatility scale (σ×√t) described those windows well. So the short rungs claim what's actually knowable: the typical travel, with earnings timing flagged where the variance will come from. The internal point calls keep being generated and graded to map where real skill begins. Full evidence: stocks/predictions/V0.5-DESIGN.md §8.

Deterministic control (v0.3 value line) targets $483.51 (-8.5%) — both lines get graded at every checkpoint, so the brain has to beat the formula, not just replace it. Brain: claude-opus-4-7.

Weaknesses

0 blocking · 1 degraded · 0 notes — follow the chain top-down (cause → effect).
  • Degraded
    [warning] Valuation is extremely fragile — almost no scenarios support the current price
    upstream:valuation-synthesis

Equation Inputs

Everything feeding the v0.6.0 model — value anchors, the stock's own price behaviour, and the tunable knobs.

Value anchors (from deep analysis)

Price at call$528.61
Composite fair value$324.08
Signal-adjusted fair value$309.08
DCF fair value$211.23
Anchored-PE fair value$728.59
Buy-below (value lens)$400.00
Value net score-72
Value confidence7 / 10
Quality net score+47
Memo confidence8 / 10
Deserved value (base)—
Quality tilt—
Deserved value (used)—
Coherence (value × quality)—

Price behaviour (trailing — shapes the realism line)

Realized volatility (annualized) 1m 33.8%  3m 34.0%  6m 31.3%  
Daily σ (realism noise)2.1%
Beta vs S&P 500 1m 0.78  3m 0.62  5m 0.85  
Trailing 6-month return-21.0%

Knobs (equation params)

ladder["w2","m1","m2","m3","m4","m5","m6"]
llm_modelclaude-opus-4-7
max_tokens3000
control_knobs{"w_dcf":0.5,"k_qual":0.200000000000000011102230246251565404236316680908203125,"reach_6m":0.450000000000000011102230246251565404236316680908203125,"coh_floor":0.5,"conf_gain":0.059999999999999997779553950749686919152736663818359375,"noise_phi":0.84999999999999997779553950749686919152736663818359375,"conf_floor":0.40000000000000002220446049250313080847263336181640625,"w_composite":0.5,"noise_window":"3m","flat_band_pct":5,"horizon_months":6,"noise_sigma_fallback":0.01499999999999999944488848768742172978818416595458984375}
Neutral band (%)5
earnings_briefv1
prompt_versionp1
control_versionv0.3.0

Version & Tech Chain

What produced this prediction — stamped on the record so versions can be compared by success rate later.
Model v0.6.0 #271041f8fcd5

Tech composition (what this version is built from)

#ProcessKindGroup
1 Synthesis valuation-synthesis deterministic final
2 Scenario Analysis scenario-valuation deterministic valuation
3 Valuation / Mispricing ext-lens-value llm extended
4 Company Quality ext-lens-quality llm extended
5 Forensic Memo (combiner) ext-forensic-memo llm extended
6 Classification company-classification llm foundation
7 Live Quote fmp-quote data market-data

Inputs used (the runs that fed this prediction)

Upstream processRanLagRun id
company-classification Aug 27, 2026 freshest MLM-20260827-000001-5177
ext-forensic-memo Aug 27, 2026 freshest ext-MLM-20260827-010042-c118
ext-lens-quality Aug 27, 2026 freshest ext-MLM-20260827-010042-c118
ext-lens-sentiment Aug 27, 2026 freshest ext-MLM-20260827-010042-c118
ext-lens-value Aug 27, 2026 freshest ext-MLM-20260827-010042-c118
scenario-valuation Aug 27, 2026 freshest MLM-20260827-000001-5177
valuation-synthesis Aug 27, 2026 freshest MLM-20260827-000001-5177

Inputs flagged 7d+ behind the freshest one may be stale relative to the rest of the analysis.

Saved History

1 frozen snapshot — the record we score once predictions mature.
MadeModelCallAt callTargetExp.Eval due
Aug 27, 2026 v0.6.0 Bear $528.61 $483.00 -8.6% Feb 2027 viewing

Not Yet Modeled

What this v0.6.0 forecast deliberately ignores — the work ahead, in plain sight.
  • Scenario probabilities — one path, no bull/bear split (base_prob = 1.0).
  • Intraday / sub-2-week behaviour — the first claim is at 14 days by design (EOD product).
  • Position sizing / portfolio context — the path is a price claim only.