What Is Private Stock Finance and How It Helps Employees at High-Growth Companies

A practical look at how non-dilutive liquidity solutions work for shareholders of late-stage private companies — including key terms like PIK rate, ATV, stock fees, and the difference between NSOs and ISOs — and the types of businesses Serengeti typically supports.

Founders, early employees, and long-term shareholders at high-growth private companies often face a familiar challenge: a large portion of their net worth is tied up in illiquid equity. They may be "paper wealthy," but real-life needs — buying a home, diversifying risk, covering taxes, funding education, or starting a new venture — continue. Traditional options like secondary sales are frequently restricted by company policies, heavily discounted, or simply unavailable until a future liquidity event.

Private stock finance offers an alternative. It allows eligible shareholders to access capital using their private company shares as collateral, without selling the shares or giving up future upside.

What Is Private Stock Finance?

Private stock finance is a structured financing solution in which a shareholder can use privately held equity (typically late-stage preferred or common shares, or vested options) as collateral for a cash advance or similar financing. The capital can be used for personal or professional purposes, while the shareholder retains ownership of the underlying shares.

Key characteristics typically include:

• Non-dilutive to the company — the financing is between the shareholder and the capital provider; it does not dilute other shareholders or require the company to issue new shares.
• Retention of upside — the shareholder keeps the shares and continues to benefit if the company's value increases.
• Structured terms — repayment is generally tied to a future liquidity event (IPO, acquisition, or other exit) or can be refinanced/prepaid earlier, depending on the structure.
• Collateralized by equity — the shares serve as the primary collateral, which allows the financing to be sized relative to the value of the holdings.

Serengeti has provided these solutions for more than seven years, underwriting structures that give shareholders access to liquidity while creating structured exposure.

Key Terms to Understand

Several concepts appear frequently in private stock finance structures. Here is a plain-language overview of the most common ones:

PIK Rate (Payment-in-Kind Rate)

A PIK rate is interest that accrues and is added to the outstanding principal balance rather than being paid in cash during the life of the financing. This means the total amount owed grows over time. It is common in private stock solutions because the underlying shares do not generate cash flow that could be used for periodic interest payments. At a liquidity event or repayment, the shareholder settles the original advance plus the accrued PIK.

ATV (Advance-to-Value)

ATV is the percentage of the current estimated value of the pledged shares that the financing provider is willing to advance. For example, an ATV of 30–40% means a shareholder with $1 million of equity value might receive $300,000–$400,000 in capital. The ATV reflects the provider's underwriting of the company, the type of shares, expected time to liquidity, and other risk factors. Higher ATVs are generally available on more mature companies or preferred shares.

Stock Fee

A stock fee (sometimes called an equity fee or participation fee) is a portion of the collateral that the financing provider receives as part of the terms of the financing. This aligns the provider's return with the performance of the underlying company while still leaving the majority of the upside with the shareholder. It is distinct from the PIK interest, which is a fixed or floating rate on the capital advanced.

NSOs vs. ISOs

Many private stock finance transactions involve employee stock options. The tax treatment differs significantly between the two main types:

• Incentive Stock Options (ISOs) — Designed for employees and generally more favorable from a tax perspective if certain holding-period rules are met. However, the exercise of ISOs can trigger Alternative Minimum Tax (AMT) even if the shares are not sold. Financing structures around ISOs must account for this potential tax liability.
• Non-Qualified Stock Options (NSOs) — Available to employees, contractors, and others. Exercise is taxed as ordinary income on the spread between the exercise price and the fair market value at exercise. NSOs are often simpler from a structuring standpoint but can create a larger immediate tax bill upon exercise.

In both cases, private stock finance can sometimes be used to help cover the cost of exercising options (including any associated taxes) without requiring the shareholder to sell shares or use personal cash. The specific structure depends on the option type, the company's equity plan, and the individual's tax situation. Participants should consult their own tax advisors, as outcomes vary.

How It Helps Employees and Shareholders

For many participants, private stock finance addresses practical gaps that secondary sales or waiting for an exit cannot:

• Access capital without selling — employees can cover major expenses or opportunities while keeping their equity position intact.
• Manage concentration risk — rather than selling a large portion of shares (often at a discount and with restrictions), shareholders can unlock a portion of the value while retaining the rest.
• Bridge timing gaps — life events and financial needs rarely align with IPO or acquisition timelines. Structured financing can bridge that period.
• Preserve long-term upside — participants continue to participate in the company's growth instead of exiting early.
• Help with option exercises — in some cases, the financing can support the cost of exercising NSOs or ISOs (and related taxes) so the shareholder can convert options into shares without an immediate cash outlay or forced sale.

The structure is most commonly used by employees and early shareholders at companies that have achieved meaningful scale and valuation but remain private. It is not a substitute for company-sponsored tender offers or secondary programs when those are available; it is an additional option when shareholders need flexibility outside those windows or for those who prefer to not sell their shares in a tender and retain their equity exposure while still receiving cash.

Who Serengeti Typically Works With

Serengeti focuses on high-growth companies where equity is valuable but illiquid, and where the firm can underwrite the opportunity with a clear view of the business and potential exit paths. In practice, this has centered on two broad categories:

• High-growth technology companies — late-stage software, fintech, consumer internet, enterprise SaaS, autonomous vehicles, neo-clouds, hardware, chip design and related businesses that have raised significant capital and built substantial employee and founder ownership.
• Defense and national-security-related technology companies — businesses developing dual-use or defense-oriented technologies. Through its affiliation with Rochefort Asset Management (a joint venture with Hayman Capital Management focused on national security direct lending), Serengeti has visibility into companies advancing priorities relevant to U.S. national and economic security.

Across both areas, Serengeti looks for situations where the underlying company has strong fundamentals, a credible path to liquidity or continued value creation, and shareholders who can benefit from structured, non-dilutive capital.

Looking Ahead

As more companies remain private longer, the demand for flexible liquidity solutions for employees and shareholders is likely to persist. Private stock finance is one tool — alongside company tender offers, secondary sales, and other structures — that can help align personal financial needs with long-term ownership. Understanding the key mechanics (PIK accrual, advance-to-value, stock fees, and the tax differences between NSOs and ISOs) helps shareholders evaluate whether a given structure fits their situation. Serengeti continues to underwrite these opportunities through its established partner channels, focusing on high-growth technology and defense-related companies where the combination of business quality and shareholder need creates an attractive opportunity.