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© 2026 Rival
  1. Home
  2. Models
  3. xAI: Grok 4
  4. Mini LBO Underwrite

See how xAI: Grok 4 compares on this challenge:

  • xAI: Grok 4 vs Claude Sonnet 4.6
  • xAI: Grok 4 vs Gemini 3.1 Pro Preview
  • xAI: Grok 4 vs Z.ai: GLM 5

4 models have responded to the "Mini LBO Underwrite" challenge. Compare their approaches side-by-side on RIVAL. This response is part of RIVAL's open dataset of 5,600+ AI model responses.

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Back to xAI: Grok 4

Mini LBO Underwrite

Grok 4's response to the 'Mini LBO Underwrite' challenge.

xAI: Grok 4
February 8, 2026
Text

?
Prompt

You are underwriting a 5-year LBO for a private equity investment committee. Company (fictional): HarborTech Services (HTS) – mission-critical HVAC maintenance + monitoring for data centers (mostly recurring service contracts). Use only the information below. Do NOT browse the web. This is a fictional exercise. ENTRY (close at end of FY2025) - FY2025 revenue: $900m - FY2025 EBITDA: $120m (13.3% margin) - Purchase price: 12.0x EBITDA - Transaction fees: 2.0% of enterprise value (paid at close, funded by equity) SOURCES & USES (simplified) - Total leverage at close: 5.5x EBITDA - Term Loan: 4.0x EBITDA, 9.0% cash interest, 1.0% annual amortization - Mezzanine: 1.5x EBITDA, 12.0% cash interest + 2.0% PIK (PIK accrues to principal) - Equity funds the remainder - Assume starting cash is $0. - Assume all free cash flow after required payments is used for optional Term Loan paydown (no dividends). OPERATING ASSUMPTIONS (FY2026–FY2030) Base case: - Revenue growth: 8%, 7%, 6%, 5%, 5% - EBITDA margin: 14.0%, 15.0%, 16.0%, 16.5%, 17.0% - Capex: 3.0% of revenue - Change in NWC: 0.5% of incremental revenue (cash outflow) - Cash tax rate: 25% applied to max(0, EBITDA - cash interest) (simplified) EXIT (end of FY2030) - Exit multiple: 10.5x FY2030 EBITDA - Exit fees: 1.0% of enterprise value - Mezzanine (including PIK) is repaid at exit. TASK 1) Build a simplified year-by-year table (FY2026–FY2030) with: revenue, EBITDA, cash interest (by tranche), cash taxes, capex, ΔNWC, free cash flow after debt service, and ending debt balances (Term Loan + Mezz). 2) Compute equity IRR and MOIC. 3) Provide a sensitivity table of equity IRR vs exit multiple (9.5x / 10.5x / 11.5x) and exit-year EBITDA margin (16% / 17% / 18%). 4) List 5 underwriting risks and 5 concrete downside protection levers. Keep it concise, but show the math clearly.

xAI: Grok 4
Response

grok-4 logo
xAI: Grok 4Mini LBO Underwrite
grok-4 logo
xAI: Grok 4

Below is a concise analysis based solely on the provided information. All calculations are shown clearly with step-by-step math. Figures are in $ millions and rounded to 1 decimal place for readability (internal calcs use more precision). The model assumes:

  • Debt at close (end FY2025 / start FY2026): Term Loan (TL) = $480.0; Mezzanine (Mezz) = $180.0.
  • Entry Enterprise Value (EV) = 12.0x * $120.0 EBITDA = $1,440.0.
  • Transaction fees = 2% * $1,440.0 = $28.8 (funded by equity).
  • Initial equity = $1,440.0 + $28.8 - $660.0 debt = $808.8.
  • TL interest: 9% on beginning balance.
  • TL mandatory amortization: 1% of initial principal = $4.8 per year (paid if cash available).
  • Mezz cash interest: 12% on beginning balance.
  • Mezz PIK: 2% on beginning balance (accrues to principal at year-end).
  • FCF before principal payments = EBITDA - total cash interest - cash taxes - capex - ΔNWC.
  • Free cash flow after debt service = FCF before principal payments - TL mandatory amortization (remainder used for optional TL paydown; assumes positive FCF covers mandatory).
  • Total annual TL paydown = mandatory + optional.
  • No cash build (starting cash = $0; all excess sweeps to TL).
  • 5-year hold (entry t=0 end FY2025; exit t=5 end FY2030).
  • No intermediate equity cash flows (no dividends).

1) Year-by-Year Table (FY2026–FY2030)

MetricFY2026FY2027FY2028FY2029FY2030
Revenue972.01,040.01,102.51,157.61,215.5
(Calc)900*1.08972*1.071,040.0*1.061,102.5*1.051,157.6*1.05
EBITDA136.1156.0176.4191.0206.6
(Calc)972*0.141,040.0*0.151,102.5*0.161,157.6*0.1651,215.5*0.17
TL Cash Interest43.241.038.335.131.4
(Calc; Beg TL)0.09*480.00.09*455.50.09*425.90.09*390.30.09*348.4
Mezz Cash Interest21.622.022.523.023.5
(Calc; Beg Mezz)0.12*180.00.12*183.60.12*187.30.12*191.00.12*194.9
Cash Taxes17.823.328.933.237.9
(Taxable Inc)max(0,136.1-64.8)=71.3max(0,156.0-63.1)=92.9max(0,176.4-60.8)=115.6max(0,191.0-58.1)=132.9max(0,206.6-54.9)=151.7
(Calc)0.25*71.30.25*92.90.25*115.60.25*132.90.25*151.7
Capex29.231.233.134.736.5
(Calc)0.03*972.00.03*1,040.00.03*1,102.50.03*1,157.60.03*1,215.5
ΔNWC (outflow)0.40.30.30.30.3
(Inc Rev)72.068.062.555.157.9
(Calc)0.005*72.00.005*68.00.005*62.50.005*55.10.005*57.9
FCF Before Principal Payments23.938.153.365.777.5
(Calc)136.1-64.8-17.8-29.2-0.4156.0-63.1-23.3-31.2-0.3176.4-60.8-28.9-33.1-0.3191.0-58.1-33.2-34.7-0.3206.6-54.9-37.9-36.5-0.3
Free Cash Flow After Debt Service19.133.348.560.972.7
(Calc)23.9-4.838.1-4.853.3-4.865.7-4.877.5-4.8
Ending TL Balance455.5425.9390.3348.4300.5
(Beg - Total Paydown)480.0-(4.8+19.1)455.5-(4.8+33.3)425.9-(4.8+48.5)390.3-(4.8+60.9)348.4-(4.8+72.7)
Ending Mezz Balance183.6187.3191.0194.9198.8
(Beg + PIK)180.0+ (0.02*180.0)183.6+ (0.02*183.6)187.3+ (0.02*187.3)191.0+ (0.02*191.0)194.9+ (0.02*194.9)

2) Equity IRR and MOIC (Base Case)

  • FY2030 EBITDA = $206.6.
  • Exit EV = 10.5x * $206.6 = $2,169.3.
  • Exit fees = 1% * $2,169.3 = $21.7.
  • Net debt at exit = Ending TL ($300.5) + Ending Mezz ($198.8) - cash ($0) = $499.3.
  • Exit equity proceeds = $2,169.3 - $499.3 - $21.7 = $1,648.3.
  • MOIC = $1,648.3 / $808.8 = 2.04x.
  • IRR: Solve $808.8 = $1,648.3 / (1 + r)^5 → r ≈ 15.3% (calculated via formula: r = ($1,648.3 / $808.8)^(1/5) - 1).

3) Sensitivity Table: Equity IRR

Varies exit multiple and FY2030 EBITDA margin (all other assumptions fixed; FY2030 revenue fixed at $1,215.5; recomputes EBITDA, EV, fees, and equity proceeds accordingly).

Exit Multiple \ FY2030 Margin16% (EBITDA $194.5)17% (EBITDA $206.6)18% (EBITDA $218.8)
9.5x10.8%12.2%13.6%
(Exit EV / Equity)$1,847.8 / $1,326.8$1,963.7 / $1,442.7$2,079.6 / $1,558.6
10.5x13.7%15.3%16.8%
(Exit EV / Equity)$2,042.3 / $1,521.3$2,169.3 / $1,648.3$2,296.3 / $1,775.3
11.5x16.5%18.1%19.8%
(Exit EV / Equity)$2,236.8 / $1,715.8$2,374.9 / $1,853.9$2,512.9 / $1,991.9

(Equity = EV - net debt $499.3 - fees 1% of EV; IRR via same 5-year formula as above.)

4) Underwriting Risks and Downside Protection Levers

5 Underwriting Risks:

  1. Customer concentration: Reliance on a few large data center clients could lead to revenue loss if contracts are terminated or renegotiated.
  2. Economic downturn: Reduced data center expansion (e.g., due to recession) could slow revenue growth below 5-8% assumptions.
  3. Margin compression: Rising labor/material costs for HVAC services could erode EBITDA margins below 14-17% targets.
  4. Regulatory changes: New environmental regs on HVAC efficiency could increase capex needs beyond 3% of revenue.
  5. Interest rate risk: Floating rates (not specified but implied) could raise effective interest above 9-14% if rates rise.

5 Concrete Downside Protection Levers:

  1. Recurring contracts: mostly service-based revenue provides sticky, predictable cash flows to service debt.
  2. Cash flow sweep: Mandatory sweep of excess FCF to TL paydown accelerates deleveraging (e.g., from 5.5x to ~2.4x by exit).
  3. Mezz structure: PIK component defers cash outflows, preserving liquidity for senior debt service.
  4. Conservative leverage: Starting at 5.5x with amortization ensures net debt/EBITDA declines to <3x by FY2028.
  5. Exit flexibility: Ability to exit at lower multiples (e.g., 9.5x) still yields positive IRR (>10%) in sensitivities.
Mini LBO Underwrite

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About xAI: Grok 4

Capabilities

ConversationReasoningCode GenerationAnalysis

Categories

TextCodeMultimodal

Specifications

Provider
Xai
Released
2025-07-09
Size
LARGE
Parameters
Not disclosed
Context
256,000 tokens

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Claude Sonnet 4.6's version

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