Tender Offer vs Open Market Sale: Which Nets More

A $2 million liquidity event in California, taxed as a short-term capital gain, can leave the seller with roughly $980,000 after federal tax, the 3.8% NIIT, state tax, and advisory fees. The same $2 million, held one year and a day longer to qualify for long-term treatment, nets closer to $1.22 million. That gap — about $240,000 on identical gross proceeds — is the real subject of the “tender offer versus open market sale” question. The vehicle matters less than what holding period and structure it locks you into.

The framing most coverage uses — tender offer as the private-company option, open market sale as the post-IPO option — obscures the actual decision. Both are disposal mechanisms. What separates them is timing relative to your one-year holding clock, the lockup period that may block the open market route entirely, and whether a tender offer’s structure risks recharacterizing your capital gain as ordinary compensation income. This analysis runs the net proceeds math on both, calculates the Finluxy Liquidity Event Net Yield for each scenario, and isolates where the difference actually comes from.

The five numbers that decide the outcome

Before comparing mechanisms, fix the rate stack. Every net proceeds calculation in this article is built from these figures, each verified against a primary source.

Sources: IRS Topic No. 409 (2025); IRS Topic No. 559 and 26 U.S.C. §1411 (NIIT, $250,000 MFJ threshold, not inflation-indexed); California FTB / Behavioral Health Services Fund surcharge (12.3% base + 1% over $1M). Federal rates made permanent under the One Big Beautiful Bill Act, July 2025.

Two of these deserve a flag. The NIIT threshold sits at $250,000 of modified adjusted gross income for joint filers and has never been indexed for inflation since it took effect in 2013, which is why nearly every seven-figure liquidity event triggers it. And California grants no preferential rate for long-term gains — the state taxes a capital gain at the same rate as wages, so the 13.3% applies whether your holding period is fifteen months or fifteen days. The full mechanics of the state layer are covered in the California tax on liquidity events breakdown.

Tender offer and open market sale are not the same instrument

A tender offer is a company-organized transaction. The company, or a syndicate of incoming investors, offers to buy a defined slice of vested equity — typically 15% to 20% of holdings — from current and sometimes former employees at a set price, in a window that SEC Rule 14e-1 requires to stay open at least 20 business days. It is the primary liquidity route for stock in a company that has not gone public. The seller picks which share lots to tender and at what quantity, within the company’s cap.

An open market sale is what becomes available after an IPO. Once shares are registered and trading, an employee sells through a brokerage at the prevailing market price, subject to two constraints: the contractual lockup period cost that blocks sales for a negotiated stretch after listing, and SEC Rule 144 volume limits for affiliates. The SEC does not set lockup length; 180 days is the industry default, with most agreements landing between 90 and 180 days and some structured as tiered releases. Rule 144 caps an affiliate’s sales in any three-month window at the greater of 1% of outstanding shares or the average weekly trading volume over the preceding four weeks.

So the choice is rarely “which should I use.” More often it is sequential: tender now while private, or wait for the IPO and the open market. The tax consequence of that timing is the whole game. Holders weighing the post-listing route should also model the IPO tax cost for RSU and option holders, since RSU vesting at listing generates ordinary income independent of any later sale.

Running the net proceeds: $2M gross, three scenarios

Take a $2,000,000 gross gain — the spread between cost basis and sale price — in a California company. Model three realistic paths. Legal and advisory costs are set at $40,000 combined, the figure the Cluster Brief uses as its reference for a transaction of this size; actual fees vary with deal complexity and whether the seller engages counsel to review tender documents.

Sources: rate stack per IRS Topic 409 / Topic 559 / California FTB as cited above. * Scenario C: compensatory proceeds are wages, not net investment income, so NIIT does not apply — but the gain becomes subject to FICA/Medicare withholding not modeled here, which narrows or erases the apparent advantage. Figures are illustrative model outputs, not tax projections.

Scenario A is the clean case: stock held more than a year, sold through a properly structured tender offer that everyone treats as a capital transaction. The 20% federal rate plus NIIT plus California’s 13.3% produces a combined 37.1% on the gain. Tax of $742,000, fees of $40,000, net of $1,218,000.

Scenario B shows what happens when the open market sale lands inside the one-year holding window — common when an employee’s RSUs settle at IPO and the lockup expires before the shares have aged a year from the settlement date. The gain is short-term, taxed at the 37% ordinary federal rate. Same NIIT, same California layer. Net drops to $878,000. The mechanism didn’t change the outcome; the holding period did.

Scenario C is the trap inside the tender route. If a tender offer is structured so the IRS deems it compensatory — for instance, a large shareholder with a board seat buying from a current employee above the 409A value — the spread can be recharacterized as ordinary compensation income rather than capital gain. The federal rate jumps to 37%, and FICA enters. The headline net of $954,000 looks better than Scenario B only because NIIT drops out; once employer and employee payroll taxes on the compensatory portion are added, the real figure compresses further. The structure of the deal, not the seller’s intent, drives this.

Finluxy Liquidity Event Net Yield by scenario

The Finluxy Liquidity Event Net Yield expresses net after-tax, after-fee proceeds as a percentage of gross pre-tax proceeds. It is the single number that makes disposal mechanisms comparable, because it strips out deal size and reports only how much of each gross dollar survives.

Net Yield = net proceeds ÷ $2,000,000 gross × 100. Scenario C excludes FICA/Medicare on the compensatory portion; including it pushes the yield below Scenario A and toward the low-40s. Model outputs for illustration.

For context against a no-income-tax state: strip out California’s 13.3% from Scenario A and the same long-term tender nets about $1,484,000 — a Net Yield near 74%. That 13-point swing is entirely the state layer, and it is why sellers who can establish residency before a liquidity event sometimes find the move pays for itself. The catch, specific to California and New York, is source-based taxation: both states tax gains attributable to in-state companies even after the employee moves, so relocation does not always escape the state bill. The state-by-state spread is mapped in the $2M liquidity event net yield by state analysis.

What the data shows that most coverage misses

Most “tender offer versus open market” comparisons frame the tender as the inferior, illiquid option you tolerate before an IPO unlocks the “real” market. The net yield math inverts that. A tender offer’s defining feature — that you choose which lots to sell and when — is precisely the lever that keeps gains long-term. The open market sale’s defining feature — that it’s gated behind a lockup — is what most often forces a sale inside the one-year window, converting a 20% federal rate into a 37% one.

Put plainly: the tender offer is frequently the higher-yield instrument, not despite being the pre-IPO route but because of it. An employee who tenders qualified shares in year three of holding banks a 60.9% net yield. The same employee who waits for the IPO, then sells at lockup expiry on RSUs that settled at listing, can land in the low-40s. The mechanism reputed to give you “freedom to sell” is the one that most often taxes you hardest, because the freedom arrives before your holding clock does. Coverage that treats liquidity as the goal misses that taxed liquidity at 56 cents on the dollar is worse than waiting for liquidity at 79 cents. The mechanics of a secondary sale of private stock reward patience in a way the IPO narrative obscures.

Methodology

What this means for a $150k+ household

A household already at the top marginal bracket faces a sharper version of this decision than the rate tables suggest, because the seven-figure gain itself pushes every dollar of the event into the ceiling rates. The practical threshold to manage is the one-year holding clock, not the choice of venue. If qualified shares can be tendered while the company is private and the holding period is already satisfied, that path frequently beats waiting for an IPO whose lockup will expire before freshly settled shares mature — a 60.9% net yield against something closer to 44% on identical gross proceeds in California.

Three trade-offs deserve weighing before any disposal. First, concentration risk against tax efficiency: holding for long-term treatment means carrying single-stock exposure longer, and a company that stumbles before your clock runs out can erase more value than the tax saving would have preserved — the tax-efficient path to diversifying after a windfall is the counterweight to pure rate optimization. Second, the compensatory-structure risk in tenders is not something the seller controls; it lives in how the company designs the offer, which makes reading the offer-to-purchase document before tendering a non-optional step. Third, for those weighing an M&A exit instead, a rollover equity tax deferral can postpone the entire tax event rather than optimizing its rate, and an all-cash acquisition carries its own employee net-after-tax profile worth modeling separately.

The defensible move for a household at this income level is to run the net yield on each available path against its own holding-period and residency facts before committing, ideally with a CPA who can confirm whether a given tender offer’s structure preserves capital treatment and whether source-based state taxation follows a planned relocation. The difference between getting that analysis right and wrong, on a $2 million event, is measured in six figures — which is enough to justify the cost of the analysis several times over. A broader walkthrough of these mechanics sits in the liquidity event tax guide for founders and employees.