10b5-1 Plan Setup and Cost for Pre-IPO Sellers

The mandatory cooling-off period for an officer or director adopting a Rule 10b5-1 plan is the later of 90 days after adoption or two business days after the next quarterly earnings disclosure — capped at 120 days. That number, locked into federal rule on February 27, 2023, is the single most expensive line item in setting up a 10b5-1 plan, and it never appears on an invoice. The literal setup fees are trivial by comparison: broker commissions of roughly $0.03 to $0.04 per share, plus legal drafting that lands in the low five figures. The real cost is the three-month gap between deciding to sell and being allowed to.

For a pre-IPO seller sitting on a concentrated position, that gap is where the money is made or lost. A founder who adopts a plan the day a lockup expires cannot transact for another quarter. During that window the stock can fall 30% — and the plan, by design, removes the discretion to react. Setup cost analysis that stops at commission rates misses the entire point.

The numbers that actually matter

Sources: SEC final amendments to Rule 10b5-1 (eff. Feb. 27, 2023); SEC Rule 144; broker commission range from KB Financial Advisors practitioner data; net yield per Finluxy methodology below.

What you actually pay to set one up

Strip the plan down to its cash costs and there are three. The broker charges a per-share execution commission, generally $0.03 to $0.04 per share according to KB Financial Advisors’ published practitioner figures — a secondary source, since brokers do not publish standardized 10b5-1 rate cards. On 250,000 shares that is $7,500 to $10,000. Against a position worth $5 million at a $20 share price, the commission is about 0.2% of value, less than a typical single day’s price movement.

Legal drafting is the second cost. A custom 10b5-1 plan reviewed by securities counsel and reconciled against the company’s insider trading policy typically runs in the low five figures; firm-specific quotes are not published by any primary source, so treat any point figure with skepticism and budget a range of roughly $5,000 to $15,000 depending on complexity and whether the issuer prescribes a standard form. Many issuers mandate a designated broker and a pre-approved plan template, which compresses this cost — and your choice of counsel. The secondary sale of private stock route carries its own separate legal and transfer-agent fees that do not overlap with public-market plan costs.

Third is the spread between your limit prices and where the stock actually trades. Set a floor 10% above market and the stock can climb to a penny below it, decline, and sell nothing. That is not a fee, but it is a cost, and it is the one most setup guides ignore entirely.

The cooling-off period is the expensive part

Consider a CFO whose company’s 180-day IPO lockup — the industry-standard duration confirmed in SEC investor guidance and visible in S-1 lock-up exhibits on EDGAR — expires on a Monday. She cannot simply sell that day. To preserve the affirmative defense against insider trading, she adopts a 10b5-1 plan, and the SEC’s amended rule requires her, as a Section 16 officer, to wait the later of 90 days or two business days after the next earnings release before the first trade executes.

Stack the blackout calendar on top and the delay compounds. If she adopts the plan near a fiscal quarter’s end, the “two business days after earnings disclosure” prong can push the first trade well past the 90-day mark, toward the 120-day ceiling. A non-officer senior employee faces only a 30-day cooling-off period — a structural reason the seniority of the seller, not the size of the position, drives timing risk. The mechanics of that delay get a fuller treatment in the lockup period cost analysis, but the headline is simple: the higher your title, the longer your money sits exposed.

Rule 144 caps how fast you can exit

Affiliates — officers, directors, and large holders — face a second constraint the 10b5-1 plan must be built around. Under SEC Rule 144, an affiliate may sell in any three-month period no more than the greater of 1% of the company’s outstanding shares or the trailing four-week average weekly trading volume. For a newly public company with thin early float, that volume figure can be punishingly low, forcing a multi-quarter unwind even when the lockup has fully lifted.

Form 144 must be filed with the SEC when sales exceed 5,000 shares or $50,000 within a three-month window. A well-structured plan schedules trades to stay inside the 144 ceiling automatically, but the practical effect is that a large affiliate position cannot be liquidated in one transaction regardless of how the plan is written. This is where the diversification timeline collides with tax planning — selling slower spreads gains across tax years, which can either help or hurt depending on the rate environment, a tension covered in the tax-efficient path to diversifying after a windfall.

From gross proceeds to net proceeds

The setup fees are noise. The tax wedge is the signal. Walk a $2,000,000 sale through the full stack, assuming shares held long enough to qualify for long-term capital gains (LTCG) treatment and a California resident at top marginal rates.

Sources: IRS — LTCG top rate 20%, NIIT 3.8% on MAGI above $250,000 MFJ (IRC §1411, 2025); California Franchise Tax Board top marginal rate 13.3%. Fees illustrative. Gain assumed equal to gross proceeds for simplicity.

Combined tax of $742,000 plus $40,000 in fees leaves $1,218,000. That assumes the most favorable holding-period outcome. Now change one variable: shares sold before clearing the one-year mark trigger short-term capital gains (STCG), taxed as ordinary income up to the federal top rate of 37%. The arithmetic gets ugly fast, and it is the single most consequential decision a pre-IPO seller makes — covered in depth for both RSU and option holders after lockup.

Finluxy Liquidity Event Net Yield

The metric that collapses all of this into one number is the Finluxy Liquidity Event Net Yield — net after-tax, after-fee proceeds divided by gross pre-tax proceeds, expressed as a percentage. It answers the only question that matters: of every dollar that hits the sale, how many cents do you keep?

Sources: IRS federal LTCG (20%), STCG ordinary top rate (37%), NIIT (3.8%); California FTB (13.3%). No-tax-state row assumes 0% state, 20% LTCG, 3.8% NIIT, $40,000 fees. STCG-CA row: 37% federal + 3.8% NIIT + 13.3% CA on full proceeds, plus $40,000 fees. Figures illustrative.

The spread between the best and worst case is roughly 27 percentage points on the same gross sale. The 10b5-1 setup fee moves this number by about one-fifth of one percent. Holding period and state of residence move it by 13 to 27 points. Anyone optimizing the commission rate while ignoring the holding-period clock is counting pennies next to a bonfire. California specifically taxes gains from California-source companies even after an employee relocates, a wrinkle that defeats the obvious “move to Texas first” play and is worth its own read on California tax on liquidity events.

What most coverage overlooks

Standard 10b5-1 guidance frames the cooling-off period as a compliance hurdle. The data reframes it as a forced holding-period subsidy. Here is the overlooked mechanic: a pre-IPO seller whose shares are close to the one-year LTCG threshold can use the mandatory 90-day delay to their advantage. If the holding clock crosses 12 months during the cooling-off window, the seller converts what would have been a 37%-plus STCG event into a 20% LTCG event — without changing a single thing about the plan.

That is a tax saving of up to 17 federal percentage points, plus the NIIT and state interaction, delivered by a rule everyone treats as pure friction. On the $2M position, the swing between the STCG-California and LTCG-California rows above is roughly $260,000. The cooling-off period that costs a seller three months of market exposure can, in the right timing scenario, pay for itself many times over. No setup-cost guide frames it this way because they stop at the commission line.

Context for the $150k+ household

At $150k+ in ordinary income, a pre-IPO seller is already above the $250,000 MFJ NIIT threshold the moment a meaningful gain lands — that 3.8% surtax is not optional planning, it is automatic. The threshold has been frozen since 2013 and is not indexed for inflation, which means more of each liquidity event falls inside it every year. The practical decisions cluster around three levers, in descending order of impact: holding period, state sourcing, and only then the mechanical setup costs.

For a household in this bracket, the sequencing matters more than the negotiation. Adopt the plan during an open window with no material nonpublic information, structure the first tranche to clear the LTCG line if the position is close, and size each three-month slice to stay inside the Rule 144 cap so the plan never stalls on a filing. The $0.03-per-share commission is worth getting right, but it is a rounding error against a six-figure tax swing. Where the analysis genuinely benefits from a fee-only advisor is not the plan paperwork — it is modeling whether to accelerate or defer tranches across tax years, and that decision is large enough, in this income range, to justify the advisory cost embedded in the net-yield calculation above.