In any secondary transaction, the buyer will ask questions. Sell-side due diligence means answering them before they’re asked: gathering the facts about a position, checking them and presenting them clearly. Done well, it builds the credibility that keeps a transaction moving. Done poorly, or skipped, it’s the most common reason a promising sale stalls after the price is agreed.
This guide covers what sell-side due diligence means for private-company shares and fund interests, what to prepare, how long preparation takes, and how buyers run their own diligence on the other side.
What Is Sell‑Side Due Diligence?
Sell-side due diligence is the preparation a seller does before going to market. In a whole-company sale, it covers financials, operations, contracts and legal matters, and it often includes a quality of earnings analysis; our partner firm Founder’s Accounting describes that work on its Quality of Earnings Reports page.
In a secondary sale of private shares, the focus is narrower: the position itself and the rules around it. A buyer of your shares isn’t buying the company. They’re buying your shares, with your share class, your rights and your company’s transfer process attached.
Why Preparation Matters More in Private Markets
Public-market buyers rely on audited filings, analyst coverage and a live price. Private-market buyers have none of these. Every question they can’t answer becomes a risk they price in, or a reason to walk away. Preparation narrows that gap. It also protects you: knowing your documents before you negotiate means you won’t agree to terms the company’s process can’t support.
What to Prepare for a Secondary Sale of Private Shares
Proof of Ownership
Stock certificates or electronic ledger entries, option grant and exercise records, and vesting schedules. If you hold options rather than shares, note that most transfers require exercised shares, and exercising has its own cost and tax consequences to discuss with your advisors.
Share Class and Rights
Common or preferred, the series if preferred, and any special terms such as liquidation preferences, conversion rights or information rights. Share class affects price because different classes carry different rights.
Transfer Provisions
The company’s bylaws, shareholder agreements and stock plan documents often contain the rules that govern a sale: rights of first refusal, approval requirements, permitted-transferee lists, lock-ups and notice periods. These rules set the shape and timing of the whole transaction.
Information You’re Permitted to Share
Employees and investors often have confidentiality obligations to the company. Confirm what you can share with a prospective buyer and under what conditions. Many companies provide a standard information package for approved secondary sales.
Your Goals
How much you want to sell, why, and by when. Writing these down keeps negotiations anchored and helps your advisor test whether interest from buyers actually matches what you need.
Sell‑Side Preparation for Fund Interests
Limited partners selling a fund interest prepare a different set of materials: the fund’s limited partnership agreement, the subscription documents, recent capital account statements, the latest reports on the fund’s holdings and a record of unfunded commitments. The general partner’s consent process sets the timeline. See LP stake sales.
How Preparation Differs for Founders, Employees and Angels
Founders often hold large positions and have close relationships with the board, so the main question is how a sale will be perceived and whether the company will support it. Preparation focuses on the board’s view, any founder-specific restrictions and how much to sell without changing their role.
Employees usually hold common stock or options under a stock plan. Their preparation centers on vesting, exercise records, the plan’s transfer rules and confidentiality obligations. Many have never read their stock plan in full; it’s the most important document in the sale.
Angel investors may hold preferred shares from an early round, sometimes through a special purpose vehicle. Their preparation includes the investment documents, any side letters and, for SPV holdings, the vehicle’s own transfer rules.
Working With the Company’s Legal Team
Most secondary sales involve the company’s counsel at some point, usually to confirm ownership, review the proposed transfer and run the right of first refusal process. A respectful, organized approach helps: provide complete records, follow the notice procedures exactly and allow the time the documents specify. Companies are far more likely to support a sale when the seller has done the preparation.
How Long Does Sell‑Side Preparation Take?
For an individual with organized records, gathering the materials can take days. Locating old option paperwork or waiting for the company to confirm records can take longer. Fund interests depend on the general partner’s responsiveness. The company’s approval process, which follows the negotiation, usually takes longer than preparation itself. Starting early is the simplest way to avoid pressure later.
How Preparation Builds Credibility
Trust is the currency of every transaction. A seller who can show ownership, rights and transfer rules clearly removes questions that would otherwise slow negotiations or reduce interest. It also signals seriousness: buyers prioritize sellers who are ready to close.
From Facts to a Story
Due diligence supplies the facts; the story puts them in context. Why does this position exist, what has the company achieved, and what should a buyer understand about the opportunity? A clear, accurate story, built on verified facts and within what you’re permitted to disclose, is what a buyer remembers. Read The Storytelling Advantage for more.
Due Diligence From the Buyer’s Side
Buyers run their own diligence, and knowing what they check helps sellers prepare:
- Ownership and title: that the seller owns the shares free of liens or competing claims.
- Share class and rights: what the shares entitle the holder to.
- Transfer feasibility: the company’s approval process and any right of first refusal.
- Company information: what the company provides to approved buyers.
- Risk: private-company shares can be illiquid and speculative, and buyers can lose all or part of their investment.
When both sides prepare, transactions move faster. See Acquiring a position for the buyer’s process.
What Happens After the Price Is Agreed
Agreeing a price starts the second half of the transaction. The company receives notice of the proposed transfer and decides whether to exercise its right of first refusal, or to let its investors do so. If the right isn’t exercised, the company reviews and approves the transfer, the parties sign transfer documents, and settlement moves cash to the seller and shares to the buyer through the broker-dealer. Each step has its own timing, and preparation done at the start is what keeps this half on schedule.
Writing Down Your Goals
A one-page note of your goals is the simplest piece of preparation and one of the most useful. It should cover the number of shares you’re willing to sell and the most you’d consider; the reason for the sale, whether diversification, a purchase, a new venture or reducing risk; the timing you need, and whether it’s firm or flexible; your priorities among price, speed and confidentiality; and anything that would make you walk away. Revisit the note before every negotiation. It keeps decisions anchored to what you set out to do rather than to whatever the latest offer suggests.
Common Due Diligence Gaps That Delay a Sale
- Missing exercise records for options exercised years ago.
- Unclear share class after a recapitalization.
- A right of first refusal notice period nobody planned for.
- Information shared before confirming it was permitted.
- No written record of the seller’s goals, so terms drift during negotiation.
How Confidentiality and Diligence Work Together
Diligence requires sharing information; confidentiality requires limiting it. The two are reconciled by sequence. Early conversations use only what’s needed to judge interest: the company’s sector, the share class and the approximate size of the position. Detailed information follows once a buyer is verified, interested and bound by appropriate confidentiality terms, and only to the extent the company permits. Keeping a record of what was shared, with whom and when protects the seller and the company alike.
For funds, the same discipline protects portfolio-company relationships. A fund that shares too much, too early, risks its standing with the company and with other investors. A staged approach keeps the process discreet while giving serious buyers what they need.
A Sell‑Side Due Diligence Checklist
- Gather ownership, grant, exercise and vesting records.
- Confirm share class and rights.
- Read the transfer provisions and note every approval step and deadline.
- Confirm what information you are allowed to share.
- Write down your goals and timing.
- Talk with qualified tax and financial professionals.
- Choose who will represent you and which broker-dealer will execute the transaction.
Download the Sell-Side Advisory Checklist (PDF) for a printable version.
Frequently Asked Questions
Is sell-side due diligence the same as an audit?
No. An audit tests a company’s financial statements. Sell-side due diligence for a secondary sale prepares the facts about a specific position and the rules governing its transfer.
Do I need to exercise my options before selling?
Most secondary transfers involve shares, not options, so exercising is often required. Exercise has cost and tax consequences; talk with your own advisors first.
What is a right of first refusal?
A right held by the company or its investors to buy your shares on the same terms as an outside buyer before the sale can proceed.
Can my company refuse to approve a sale?
Companies often have approval rights under their documents. Reviewing those rules first shows what’s possible.