Founder Secondary: Selling Shares Before the Exit (2026 Guide)

Short answer. A "founder secondary" is the sale, by the founder, of a fraction of their shares during a fundraising round, outside any full-exit process. It is a partial liquidity event: the founder cashes in, the incoming fund takes over the shares, and the founder keeps running the business. Well calibrated (typically 5%–20% of the position), it secures wealth without breaking alignment. Poorly calibrated, it sends a negative signal and triggers heavy taxation.

A founder secondary typically takes place during a Series B or C round: a new investor enters the cap table and, in parallel, buys part of the founder's shares. It differs from:

• a classic partial sale (the buyer is not a dilutive financial investor);
• an OBO (the founder's holding raises debt to repurchase shares);
• a company share buyback (capital reduction, legally framed).

A founder secondary is a cap-table event: no strategic change, no governance overhaul, but a transfer of existing shares.

Three cumulative conditions:

• The company is on a healthy trajectory (NRR > 110%, runway > 18 months base case, Rule of 40 > 30%).
• Lead investors support the operation.
• The founder commits to staying at least 24 months post-transaction, with a residual lock-up on remaining shares.

If any of these is missing, the secondary sends a negative signal that future rounds cannot quickly erase.

Frequently observed orders of magnitude:

• 5%–10% of the founder's position: neutral, perceived as reasonable diversification.
• 10%–20%: acceptable if the company's situation is solid and the narrative clear.
• > 20%: triggers a warning signal, except in a structured wealth-planning project.

The narrative matters as much as the percentage: a secondary framed as a way for the founder to focus on the company is better received than one perceived as a gradual withdrawal.

4.1. General case: 30% PFU#

A share sale by an individual is in principle subject to the flat tax (PFU) under CGI art. 200 A: 12.8% income tax + 17.2% social levies = 30%. The progressive bracket option is available (CGI art. 150-0 D) with specific holding-period allowances in certain cases.

4.2. BSPCE (CGI art. 163 bis G)#

For BSPCE holders, the specific regime of CGI art. 163 bis G provides a tax treatment depending on the duration of activity. Exact parameters depend on the grant date and length of activity at sale; verify with a chartered accountant at transaction date.

4.3. Retirement allowance#

CGI art. 150-0 D ter provides, under strict conditions, a specific allowance for SME executives selling shares upon retirement. It does not apply to standard secondaries; mentioned because it often belongs to a wider wealth-planning reflection.

If the founder does not need all the cash immediately, they can consider an apport-cession via a holding company (CGI art. 150-0 B ter) before the secondary sale:

• shares are contributed to a founder-controlled holding;
• the contribution capital gain is deferred;
• the holding then sells the shares to the investor;
• reinvestment constraints apply if the holding sells quickly after the contribution.

Exact percentages, deadlines and conditions are set by law and BOFiP doctrine; verify at transaction date.

Apport-cession allows:

• deferring tax on the portion not intended for immediate consumption;
• structuring wealth with a long-term investment logic.

Drawbacks:

• complexity, structuring cost, annual follow-up;
• strict formal constraints;
• risk of recharacterisation if reinvestment is non-compliant.

A well-structured secondary always comes with a residual lock-up on the founder's remaining shares, typically 24 to 48 months, with:

• transfer prohibition except in defined cases (drag-along, majority tag-along);
• specific good-leaver / bad-leaver clauses;
• non-compete and non-solicit obligations.

The shareholders' agreement is updated. Without residual lock-up, secondaries are rarely accepted by incoming investors.

Three principles guide a successful secondary.

• Secure without signalling withdrawal. Percentage and narrative both matter.
• Optimise without rigidifying. Apport-cession is powerful but not for every wealth profile.
• Document without overloading. Independent valuation, updated agreement, retained tax substantiation.

The chartered accountant plays a pivot role: documenting valuation, structuring tax, anticipating post-deal cash, maintaining consistency with company accounting (especially with concurrent BSPCE exercises, free-share grants, primary round).

• The signal to future investors: an oversized, poorly framed secondary weighs on subsequent rounds.
• Tax misanticipation: bracket vs PFU, 150-0 D allowances, BSPCE treatment.
• Cash-timing gap: weeks between closing and effective payment.
• Outdated agreement: failing to align drag-along clauses with the new cap table can block a future exit.
• Holding mistake: creating an ad hoc holding without genuine economic substance is risky.

• What percentage? Consistent with wealth project.
• What structure? Direct sale or via holding (apport-cession).
• What narrative? For investors, board and team.
• What residual lock-up? 24, 36, 48 months.
• What use of cash? Immediate liquidity vs long-term reinvestment.
• What tax follow-up? Declaration, deferral monitoring, multi-year case management.

• CGI art. 150-0 B ter: reinvestment conditions to verify at contribution date.
• BSPCE: regime sensitive to activity duration; no quick extrapolation.
• AMF / disclosure: for pre-IPO companies, a founder secondary should fit a coherent disclosure policy.
• Accounting consistency: every secondary must be traceable in the share-movements register and reflected in the cap table.
• Regulated agreements: if the founder's holding contracts with the company, French Commercial Code art. L.227-10 (SAS) duties apply.

1. Difference between secondary and OBO? In a secondary, a third-party investor buys the founder's shares as part of a round. In an OBO, the founder's holding does the buying using debt.

2. Should we sell all or part of BSPCE? Depends on activity duration (CGI art. 163 bis G), exercise schedule and available cash. Case-by-case arbitrage.

3. Is the secondary taxable in the same year as the round? Yes, the capital gain is in principle taxable in the year of sale, even if the primary round is dilutive.

4. Can secondary be combined with the retirement allowance? Art. 150-0 D ter targets sale upon retirement under strict conditions. It does not automatically apply to a standard secondary.

5. Do we need both lawyer and chartered accountant? Yes. Counsel structures the deeds and agreement. The chartered accountant secures valuation, tax, cap table and consistency with accounting.

A founder secondary is rarely a stand-alone process: it usually rides on a primary round and follows its tempo.

Weeks 1 to 4 — preparation. Discussion with lead investors, sizing, narrative alignment. The chartered accountant updates the cap table, models the post-round dilution and the founder's net cash after tax under each option (direct sale, holding, mixed).

Weeks 5 to 8 — primary term sheet. The secondary clauses are negotiated as a sub-section of the main term sheet: price, sizing, residual lock-up, drag-along carve-outs. Consistency with the liquidation preferences of the primary round is critical.

Weeks 9 to 12 — definitive documentation. Shareholders' agreement, founder lock-up, tax structuring (direct or apport-cession), declaration formalities. The tax lawyer drafts the contribution acts in case of a holding structure.

Weeks 13 to 16 — closing. Signing alongside the primary round, payment, share-movements register update, declaration of capital gain in the year's tax return, organisation of the founder's wealth follow-up over time.

A secondary entirely disconnected from a primary round (pure tender to existing investors) follows a different rhythm: 8 to 12 weeks at most, with an internal valuation reference. In all cases, the founder should anticipate that effective payment can lag closing by several weeks because of escrow or wire-transfer arrangements; the personal cash plan must reflect this lag.

A well-sized founder secondary is a powerful wealth-management tool. It requires a healthy trajectory, prudent sizing, solid residual lock-up, controlled tax structure and clear narrative. Poorly sized, it weighs durably on company perception.

If you are considering a secondary at the occasion of a round, our team supports founders and CEOs on valuation, tax structuring, cap table and coordination with legal counsel.

Updated as of 2 June 2026.