They do not usually determine the company’s enterprise value by themselves. Instead, the valuation process generally has two stages:

1. Estimate the company’s enterprise value or total equity value.

2. Allocate that value among the different equity classes based on their rights, preferences and expected outcomes.

The correct allocation method depends on the company’s:

• Funding stage

• Capital structure

• Recent financing activity

• Expected liquidity events

• Ability to forecast future outcomes

• Preferred stock rights

• Time to a possible exit

• Availability of reliable market evidence

The three main methods are:

• Option Pricing Method: Treats equity securities as options on the company’s total equity value.

• Probability-Weighted Expected Return Method: Values common stock across multiple future scenarios and probability-weights the results.

• Current Value Method: Allocates the company’s current equity value according to liquidation rights as if an immediate liquidity event occurred.

A hybrid method may combine OPM and PWERM when the company has identifiable exit scenarios but substantial uncertainty remains.

The IRS does not require one specific allocation method for every 409A valuation. Its regulations require the reasonable application of a reasonable valuation method based on the facts and circumstances as of the valuation date. Relevant factors include assets, anticipated cash flows, comparable-company values, recent arm’s-length transactions and discounts for lack of marketability.

OPM vs PWERM vs CVM at a Glance

409A Valuation Method Decision Tree

Use the following decision framework as an initial guide.

Question 1: Is an immediate sale, liquidation or other liquidity event expected?

Yes

Consider the Current Value Method when allocating value according to the current liquidation preferences reasonably represents the expected outcome.

If several near-term outcomes remain possible, consider PWERM instead.

No

Continue to Question 2.

Question 2: Can the company identify specific future outcomes and estimate their probabilities?

Examples include:

• IPO

• Strategic sale

• Financial-buyer sale

• Continued private operation

• Downside liquidation

Yes

Consider PWERM.

If some outcomes can be modelled specifically but the continued-private scenario remains uncertain, consider a hybrid method.

No

Continue to Question 3.

Question 3: Is there a recent arm’s-length preferred financing?

Yes

Consider an OPM backsolve to infer the company’s total equity value from the recent preferred stock price.

The transaction must still be reviewed for:

• Investor rights

• Strategic terms

• Transaction date

• Market changes

• Secondary components

• Unusual protections

• Whether the price reflects fair market value

No

Consider using OPM after estimating total equity value through an income, market or asset approach.

Question 4: Is the company approaching a reasonably foreseeable IPO or sale?

Yes

Consider PWERM or a hybrid method, because specific liquidity outcomes may now be easier to model.

No

OPM may remain appropriate where the timing and form of an exit are highly uncertain.

The method should never be selected solely from this decision tree. The company’s actual capital structure, transaction evidence and market-participant assumptions must also be considered.

The Two-Step 409A Valuation Process

OPM, PWERM and CVM are principally equity-allocation methods.

Before applying them, the valuation professional normally determines the company’s total equity value.

Step 1: Estimate Enterprise Value

Enterprise value may be estimated using:

• Discounted Cash Flow analysis

• Guideline public-company method

• Precedent transaction method

• Recent financing or calibration

• Asset approach

• A combination of valuation approaches

Step 2: Convert Enterprise Value to Equity Value

A simplified bridge is:

Equity Value = Enterprise Value + Cash and Non-operating Assets − Debt and Senior Claims

Other adjustments may include:

• Preferred claims not included in the allocation model

• Non-controlling interests

• Unfunded obligations

• Contingent liabilities

• Non-operating investments

Step 3: Allocate Equity Value

The total equity value is then allocated among:

• Preferred stock classes

• Common stock

• Options

• Warrants

• Convertible instruments

• Other equity-linked securities

The allocation must reflect the rights contained in the company’s governing legal documents.

Method 1: Current Value Method

The Current Value Method allocates the company’s equity value as if an immediate liquidity event occurred on the valuation date.

The available value is distributed through the contractual liquidation waterfall.

How CVM Works

Assume the company has:

• Total equity value of $20 million

• Series A preferred stock with a $10 million liquidation preference

• Common shareholders entitled to the remaining value

Under a simple non-participating structure:

1. Series A receives its $10 million liquidation preference.

2. Common receives the remaining $10 million.

The actual allocation may differ if preferred holders have:

• Participation rights

• Conversion rights

• Multiple liquidation preferences

• Dividends

• Senior or pari passu preferences

• Caps on participation

When CVM May Be Appropriate

CVM may be considered when:

• A sale or liquidation is imminent.

• The timing and value of the liquidity event are reasonably clear.

• Future optionality is limited.

• The company has not created meaningful value above liquidation preferences.

• Immediate allocation reasonably reflects market-participant expectations.

Advantages of CVM

• Easy to understand

• Directly reflects liquidation rights

• Requires fewer assumptions than OPM or PWERM

• Does not require volatility or option-pricing inputs

• Useful when immediate liquidity is the relevant economic assumption

Limitations of CVM

• Assumes the company is valued as of an immediate event.

• May assign little or no value to common stock when preferred liquidation preferences exceed total equity value.

• Does not fully capture the possibility that common stock could benefit from future growth.

• May be inappropriate for a going-concern company with multiple possible future outcomes.

• Can understate common stock value when significant future optionality exists.

Public company filings describing private-company valuations explain that CVM allocates current value according to liquidation preferences, with residual value assigned to common stock.

Method 2: Option Pricing Method

The Option Pricing Method treats preferred and common stock as call options on the company’s total equity value.

Each security class participates differently as total equity value moves through a series of breakpoints.

These breakpoints are determined by:

• Liquidation preferences

• Conversion rights

• Participation rights

• Seniority

• Exercise prices

• Other contractual terms

The OPM usually applies an option-pricing model, such as Black-Scholes, to estimate the present value of each equity-value tranche.

SEC filings describing AICPA-based private-company valuations explain that OPM creates a series of call options with exercise prices based on the liquidation preferences and conversion terms of each equity class.

Common OPM Inputs

An OPM analysis commonly requires:

• Total equity value

• Equity breakpoints

• Expected time to liquidity

• Equity volatility

• Risk-free interest rate

• Expected dividend yield

• Rights of each security class

• Fully diluted share count

• Discount for lack of marketability

How OPM Breakpoints Work

Assume:

• Series A invested $10 million.

• Series A owns 40% on an as-converted basis.

• Common stock owns 60%.

• Series A has a 1x non-participating liquidation preference.

Series A will choose between:

• Receiving its $10 million preference, or

• Converting and receiving 40% of total equity value.

Conversion becomes more valuable when:

40% × Total Equity Value > $10 million

Therefore:

Conversion Threshold = $10 million ÷ 40%

Conversion Threshold = $25 million

The main breakpoints are therefore:

• $0 to $10 million

• $10 million to $25 million

• Above $25 million

Illustrative OPM Allocation Example

Assume:

• Total equity value: $30 million

• Series A shares: 4 million

• Common and common-equivalent shares: 6 million

• Series A liquidation preference: $10 million

• Series A as-converted ownership: 40%

• Expected time to liquidity: Three years

• Volatility: 60%

• Risk-free rate: 4.5%

• Dividend yield: 0%

The OPM separates total equity into the following tranches:

Using an illustrative option-pricing calculation, the present values of the tranches are:

The tranche values are allocated as follows:

Series A Allocation

• First tranche: $7.85 million

• 40% of the third tranche: $5.92 million

Series A Value = $13.77 million

Per Series A share:

$13.77 million ÷ 4 million shares = $3.44 per share

Common Allocation

• Second tranche: $7.36 million

• 60% of the third tranche: $8.87 million

Common Value = $16.23 million

Per common share before marketability adjustment:

$16.23 million ÷ 6 million shares = $2.71 per share

Assume a supportable 20% Discount for Lack of Marketability:

Common FMV = $2.71 × (1 − 20%)

Common FMV = $2.17 per share

This example is simplified. A real OPM may contain several preferred classes, participation caps, warrants, options and additional breakpoints.

Advantages of OPM

• Captures the economic differences among security classes.

• Reflects the possibility of multiple future equity values.

• Does not require management to assign probabilities to specific exit events.

• Works well when the timing and form of the exit are uncertain.

• Can incorporate complex liquidation and conversion rights.

• Can be calibrated to a recent financing through backsolve.

Limitations of OPM

• Requires significant modelling expertise.

• Results are sensitive to volatility and time to liquidity.

• Assumes a continuous distribution of possible future values.

• May not adequately reflect a clearly defined IPO or sale scenario.

• Can be difficult for boards and employees to understand.

• Small changes in capital structure may create additional breakpoints.

• DLOM assumptions can materially affect common stock value.

What Is the OPM Backsolve Method?

Backsolve is an application of OPM used to infer the company’s total equity value from a recent preferred stock financing.

Instead of starting with total equity value and calculating the preferred stock price, the model works in reverse.

The valuation professional:

1. Enters the capital structure and security rights.

2. Enters OPM assumptions such as volatility and expected liquidity timing.

3. Calculates the theoretical value of the recently issued preferred stock.

4. Adjusts total equity value until the modelled preferred price equals the observed transaction price.

SEC filings describe backsolve as an iterative process in which total equity value is adjusted until the OPM value of the recently sold preferred class equals the price paid in the arm’s-length financing.

Simplified Backsolve Example

Using the previous capital structure, assume investors recently paid $3.50 per Series A share.

At a total equity value of $30 million, the illustrative OPM produced a Series A value of approximately $3.44 per share.

The backsolve model increases total equity value until the calculated Series A value equals $3.50.

Under the same simplified assumptions, the inferred total equity value would be approximately:

$30.6 million

This inferred equity value can then be allocated among preferred and common stock using OPM.

When Backsolve May Be Useful

Backsolve may be appropriate when:

• A recent arm’s-length financing has occurred.

• The security sold is part of the company’s current capital structure.

• The transaction price contains useful market evidence.

• The rights and preferences can be modelled.

• Market conditions have not changed materially.

• The financing was not primarily strategic or distressed.

Backsolve Does Not Mean the Financing Price Is Automatically Fair Value

The transaction should be reviewed for:

• Strategic investor benefits

• Board or information rights

• Commercial agreements

• Anti-dilution protections

• Investor-specific rights

• Secondary share components

• Transaction costs

• Financing urgency

• Market changes after the transaction

• Whether the transaction involved new and existing investors

• Whether the financing was orderly and arm’s length

Backsolve is a calibration technique, not a mechanical rule.

Method 3: Probability-Weighted Expected Return Method

PWERM values common stock by considering multiple discrete future outcomes.

For each scenario, the valuation professional:

1. Estimates the company’s future equity value.

2. Allocates that value among the security classes.

3. Calculates common stock value under the scenario.

4. Discounts the outcome to the valuation date.

5. Applies a marketability adjustment where appropriate.

6. Assigns a probability to the scenario.

7. Probability-weights the scenario values.

Public filings applying AICPA guidance describe PWERM as a scenario-based approach that estimates value using the probability-weighted present value of expected future outcomes.

Common PWERM Scenarios

A PWERM may include:

• IPO

• Strategic acquisition

• Financial-buyer acquisition

• Continued private operation

• Secondary transaction

• Downside sale

• Liquidation

Probability-Weighted Example

Assume the company has three possible future outcomes.

Scenario 1: IPO

• Probability: 40%

• Expected common proceeds at the event: $8.00 per share

• Expected timing: Two years

• Scenario discount rate: 25%

• Marketability adjustment: 10%

Present value before marketability adjustment:

$8.00 ÷ (1.25)² = $5.12

After the 10% marketability adjustment:

$5.12 × 90% = $4.61 per share

Probability-weighted contribution:

$4.61 × 40% = $1.84

Scenario 2: Strategic Sale

• Probability: 35%

• Expected common proceeds: $5.00 per share

• Expected timing: 1.5 years

• Scenario discount rate: 22%

• Marketability adjustment: 5%

Present value before marketability adjustment:

$5.00 ÷ (1.22)¹·⁵ = approximately $3.71

After the 5% marketability adjustment:

$3.71 × 95% = approximately $3.52 per share

Probability-weighted contribution:

$3.52 × 35% = $1.23

Scenario 3: Downside Sale or Liquidation

• Probability: 25%

• Expected common proceeds: $0.50 per share

• Expected timing: One year

• Scenario discount rate: 30%

Present value:

$0.50 ÷ 1.30 = $0.38 per share

Probability-weighted contribution:

$0.38 × 25% = $0.10

PWERM Conclusion

The probability-weighted common stock value is approximately:

$3.17 per share

The assumptions in this example are illustrative. In an actual valuation, the scenario values, timing, discount rates, security allocations, probabilities and marketability treatment require separate support.

Advantages of PWERM

• Directly reflects identifiable future events.

• Can model different capital structures under each outcome.

• Useful when an IPO or sale is reasonably foreseeable.

• Allows different timing and risk assumptions for each scenario.

• Can reflect downside and upside outcomes explicitly.

• Often easier to connect with management’s strategic plans.

Limitations of PWERM

• Requires subjective scenario probabilities.

• Requires estimates of future transaction values.

• Can be sensitive to small changes in probability.

• Management optimism can influence the selected outcomes.

• Scenario overlap may cause double counting.

• Discount rates must be supported.

• It can become complex when many scenarios are used.

• Future events may change rapidly between valuation dates.

OPM vs PWERM

OPM and PWERM differ mainly in how they represent uncertainty.

OPM

OPM assumes a continuous range of possible future equity values.

It does not require management to define separate IPO, sale or continued-private scenarios.

PWERM

PWERM assumes that future outcomes can be separated into identifiable scenarios with supportable probabilities.

OPM May Be More Appropriate When

• Exit timing is uncertain.

• Several future paths remain available.

• Specific scenario probabilities cannot be supported.

• The company is early or mid-stage.

• A recent preferred financing provides backsolve evidence.

• The capital structure contains several preferred classes.

PWERM May Be More Appropriate When

• An IPO is under active consideration.

• A sale process has begun.

• Management has credible transaction scenarios.

• Liquidity-event timing can be estimated.

• The outcomes have meaningfully different security allocations.

• The company is late-stage or approaching an exit.

A recent SEC filing describes OPM as more appropriate where specific future liquidity events are difficult to forecast, while PWERM incorporates discrete outcomes such as IPO, sale or continued private operation.

What Is a Hybrid Method?

A hybrid method combines elements of OPM and PWERM.

It may be used when:

• One or more specific liquidity events can be modelled.

• Continued private operation remains possible.

• OPM is more suitable for the uncertain private-company scenario.

• PWERM is more suitable for an identifiable IPO or sale scenario.

Hybrid Method Example

Assume:

• IPO scenario probability: 35%

• Sale scenario probability: 20%

• Continued-private OPM scenario probability: 45%

The valuation professional may:

1. Calculate the common stock value under an IPO scenario.

2. Calculate common stock value under a sale scenario.

3. Apply OPM to the continued-private scenario.

4. Discount each result to the valuation date.

5. Apply appropriate marketability adjustments.

6. Probability-weight the three values.

Public filings show companies using hybrid methods combining OPM with PWERM, including IPO, sale and continued-private scenarios.

Advantages of a Hybrid Method

• Reflects both identifiable events and broader uncertainty.

• Can be more realistic for late-stage private companies.

• Avoids forcing all uncertainty into one method.

• Allows OPM to model the continued-private scenario.

• Provides flexibility during IPO or transaction preparation.

Limitations of a Hybrid Method

• More complex than using one method.

• Requires clear separation of scenarios.

• Probabilities remain subjective.

• OPM assumptions are still required.

• DLOM treatment may differ by scenario.

• Reviewers may require extensive reconciliation.

Method Suitability by Company Stage

Company stage is relevant, but it should not be the only factor used to select a method.

Method Selection Is Not Based on Stage Alone

Two Series B companies may require different methods.

For example:

• Company A has no expected liquidity event and recently completed an arm’s-length financing. OPM backsolve may be appropriate.

• Company B has received acquisition indications and is preparing for a possible IPO. PWERM or a hybrid method may be more appropriate.

The valuation method should reflect the facts known or reasonably knowable as of the valuation date.

Audit and Review Considerations

OPM, PWERM and CVM conclusions may be reviewed by:

• Financial statement auditors

• Tax advisors

• Legal counsel

• Boards

• Investors

• Acquirers

• SEC staff during an IPO review

The AICPA’s private-company equity valuation guide provides professional guidance and illustrations for estimating the value of privately issued securities used as compensation. The guide addresses private transactions, marketability, leverage, fair-value considerations and related valuation issues.

Although ASC 718 and Section 409A serve different accounting and tax purposes, companies frequently apply related private-company equity valuation frameworks when supporting common stock values.

Capital Structure Documentation

The report should include or reference:

• Certificate of incorporation

• Preferred stock terms

• Liquidation preferences

• Conversion ratios

• Participation provisions

• Dividend rights

• Warrants

• Options

• Convertible notes

• SAFEs

• Fully diluted capitalisation table

Enterprise and Equity Value Support

The report should explain:

• Valuation approaches used

• Forecasts

• Comparable companies

• Recent transactions

• Cash and debt adjustments

• Non-operating assets

• Reconciliation among approaches

OPM Documentation

An OPM should document:

• Breakpoint calculation

• Expected time to liquidity

• Volatility

• Risk-free rate

• Dividend assumption

• Fully diluted securities

• Allocation percentages

• DLOM

• Sensitivity analysis

Backsolve Documentation

A backsolve analysis should address:

• Financing date

• Transaction price

• Rights received by investors

• Transaction participants

• Strategic or commercial arrangements

• Primary and secondary components

• Changes since the financing

• Calibration results

PWERM Documentation

A PWERM should document:

• Each scenario

• Scenario probability

• Timing

• Future enterprise or equity value

• Security allocation

• Discount rate

• DLOM

• Management support

• Sensitivity to probabilities

CVM Documentation

A CVM should document:

• Why immediate liquidity is a reasonable assumption

• Current equity value

• Liquidation waterfall

• Conversion decisions

• Participation rights

• Common stock residual value

Questions an Auditor May Ask

• Why was OPM, PWERM or CVM selected?

• What changed since the prior valuation?

• Why is a previous method no longer appropriate?

• How was total equity value determined?

• Was recent financing calibrated?

• Are investor-specific rights reflected?

• How were OPM breakpoints calculated?

• Why was the selected volatility used?

• How was expected time to liquidity estimated?

• How were PWERM probabilities supported?

• Do board materials support the scenarios?

• Was a marketability discount applied consistently?

• Were subsequent events considered?

• Does the 409A value reconcile with ASC 718 conclusions?

• Why does common stock value differ from the preferred financing price?

Common 409A Methodology Errors

Mistake 1: Using the Preferred Share Price as Common Stock FMV

Preferred stock may have rights that common stock does not possess.

Correct action: Allocate equity value using an appropriate OPM, PWERM, CVM or hybrid analysis.

Mistake 2: Applying CVM Automatically to an Early-Stage Company

An early-stage company may still have significant future optionality.

Correct action: Determine whether an immediate liquidity assumption actually reflects market-participant expectations.

Mistake 3: Using OPM When a Near-Term Exit Is Clearly Identifiable

OPM may not adequately reflect a specific IPO or sale outcome.

Correct action: Evaluate PWERM or a hybrid method.

Mistake 4: Assigning PWERM Probabilities Without Evidence

Probabilities should not be selected merely to reach a target value.

Correct action: Support them with board materials, transaction activity, financing plans, advisor input and company-specific evidence.

Mistake 5: Treating Backsolve as Automatic Proof of Total Equity Value

A financing price may contain strategic, commercial or investor-specific terms.

Correct action: Analyse the transaction before calibration.

Mistake 6: Ignoring Capital Structure Changes

New options, SAFEs, warrants or preferred classes can change allocation results.

Correct action: Use a fully reconciled capitalisation table as of the valuation date.

Mistake 7: Applying One DLOM Across All Scenarios Without Review

Marketability can differ between an IPO scenario, sale scenario and continued-private scenario.

Correct action: Evaluate marketability consistently with scenario timing and liquidity.

Mistake 8: Using Stale Volatility or Liquidity Timing

OPM value is sensitive to both inputs.

Correct action: Update them as of each valuation date.

Mistake 9: Double Counting Risk

Risk may already be reflected in:

• Scenario probabilities

• Discount rates

• Enterprise value

• DLOM

Correct action: Review the full model for overlapping adjustments.

Mistake 10: Failing to Reconcile With Prior Valuations

A material change in common stock value should be explainable.

Possible drivers include:

• New financing

• Improved performance

• Shorter liquidity timing

• Increased IPO probability

• Changed volatility

• Capital structure changes

• Market conditions

409A Valuation Method Support From AcumenSphere

Selecting between OPM, PWERM, CVM and a hybrid method requires a detailed understanding of:

• Company value

• Preferred stock rights

• Capital structure

• Recent financing

• Expected exit scenarios

• Marketability

• Audit requirements

AcumenSphere supports private companies with:

• 409A valuation

• OPM allocation

• OPM backsolve

• PWERM analysis

• Current Value Method analysis

• Hybrid valuation models

• Preferred-to-common allocation

• DLOM analysis

• ASC 718 support

• Audit-ready valuation reporting

• Post-delivery auditor and stakeholder support

Request a 409A Valuation Consultation

Need help selecting the appropriate equity-allocation method for your company?

Speak with AcumenSphere about your funding stage, capital structure, recent transactions, option-grant plans and expected liquidity events.

Email: info@acumensphere.com
Phone: +1 510 203 9584

This article is provided for general informational purposes and does not constitute legal, tax, accounting, investment or financial advice. The appropriate valuation method depends on company-specific facts, security rights and circumstances as of the valuation date.