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Snapshot from Oct 13, 2026. Predictions are paused, so this will not update until research restarts.
Builders FirstSource Inc.
Industrials · Building Products & Equipment
Made on Aug 29, 2026
Price at call $67.72
6-month call Neutral -4.8%
Target by Mar 2027 $64.50
Great value below $50.00
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 -4.8% to $64.50
Predicted High $66.40 in 2 weeks
Predicted Low $61.50 at 4 months
Max Drawdown (predicted) -9.2%

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 29, 2026 1:06 pm
Neutral BLDR trends range-bound to $64.50 (-4.8% from $67.72) by Mar 2027. decay
ThesisBLDR is a rate-sensitive cyclical caught between a bearish housing-cycle sentiment overlay and a mildly supportive risk-on tape, with valuation lenses split (DCF constructive, composite fair value below spot). Expect near-term drift lower as momentum and negative value signal dominate, then partial stabilization near composite fair value as the horizon lengthens.
Invalidated ifA decisive break above $75 on housing/rate-cut catalyst, or a break below $55 signaling capitulation to bear scenario.
Checkpointtime after the call Datewhen it gets graded Predictedthe claim: closing price Current priceactual close — fills in over time Predicted returnpredicted vs $67.72 at call Conv.brain's confidence, 1–10 Driverwhy the brain put the point here
Prediction made Aug 29, 2026 — $67.72 at call — —The anchor — every point below is measured from this price and date.
2 weeks Sep 12, 2026 $60.10–$75.34 typical range · internal point $66.40 — ±11.3% 6/10 Negative momentum and sentiment continue near-term drift
What actually happened: closed $60.37 on Sep 11, 2026 = -10.9% vs the call (predicted -2.0%)  ·  direction MISS (called flat, was down)  ·  off by 8.9 pp  ·  accuracy 4/10  ·  typical range ±11.3%: inside the band  ·  S&P -0.7% over the same window — beat it
1 month Sep 29, 2026 $56.67–$78.77 typical range · internal point $65.10 — ±16.3% 6/10 Value lens pull toward composite fair value below spot
What actually happened: closed $58.01 on Sep 28, 2026 = -14.3% vs the call (predicted -3.9%)  ·  direction MISS (called flat, was down)  ·  off by 10.5 pp  ·  accuracy 4/10  ·  typical range ±16.3%: inside the band  ·  S&P -0.4% over the same window — beat it
2 months Oct 29, 2026 $63.50 — -6.2% 5/10 Housing cycle narrative weighs, high beta amplifies
3 months Nov 29, 2026 $62.00 — -8.4% 5/10 Approaches composite fair value near 60 anchor
4 months Dec 29, 2026 $61.50 — -9.2% 4/10 Stabilization near fair value; year-end tax positioning
5 months Jan 29, 2027 $63.00 — -7.0% 4/10 DCF gravity and risk-on regime provide modest lift
6 months Mar 1, 2027 $64.50 — -4.8% 3/10 Slow mean reversion toward deterministic baseline endpoint

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 $68.99 (+1.9%) — 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
    [critical] AI analysis identifies strong headwinds — multiple forces working against this stock
    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$67.72
Composite fair value$60.13
Signal-adjusted fair value$59.86
DCF fair value$89.33
Anchored-PE fair value$11.47
Buy-below (value lens)$50.00
Value net score-62
Value confidence7 / 10
Quality net score-1
Memo confidence7 / 10
Deserved value (base)—
Quality tilt—
Deserved value (used)—
Coherence (value × quality)—

Price behaviour (trailing — shapes the realism line)

Realized volatility (annualized) 1m 56.0%  3m 56.5%  6m 53.3%  
Daily σ (realism noise)3.6%
Beta vs S&P 500 1m 2.30  3m 1.74  5m 1.88  
Trailing 6-month return-35.1%

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 3, 2026 25d behind BLDR-20260803-170728-7bd8
ext-forensic-memo Aug 29, 2026 freshest ext-BLDR-20260829-014731-c459
ext-lens-quality Aug 29, 2026 freshest ext-BLDR-20260829-014731-c459
ext-lens-sentiment Aug 29, 2026 freshest ext-BLDR-20260829-014731-c459
ext-lens-value Aug 29, 2026 freshest ext-BLDR-20260829-014731-c459
scenario-valuation Aug 29, 2026 freshest BLDR-20260829-013002-34f3
valuation-synthesis Aug 29, 2026 freshest BLDR-20260829-013002-34f3

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

Saved History

4 frozen snapshots — the record we score once predictions mature.
MadeModelCallAt callTargetExp.Eval due
Aug 29, 2026 v0.6.0 Neutral $67.72 $64.50 -4.8% Mar 2027 viewing
Aug 4, 2026 v0.6.0 Bull $72.48 $80.00 +10.4% Feb 2027 view
Jul 14, 2026 v0.3.0 Neutral $75.27 $73.54 -2.3% Jan 2027 view
Jun 12, 2026 v0.3.0 Neutral $78.57 $76.26 -2.9% Dec 2026 view

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.