How to Sell IPO Shares: Lock-Up, Rule 144, and Taxes

To sell IPO shares, you generally wait for the 180-day lock-up to end, satisfy any SEC Rule 144 holding period that applies to your shares, move the shares into a brokerage account, place a market or limit sell order with your preferred tax lot selected, and then report the gain on Form 8949 and Schedule D the following spring. The steps sound simple. The complications sit in the timing rules, the type of equity you hold, and the tax treatment that follows — and getting any of those wrong is where people lose real money.

Wait Out the Lock-Up

A lock-up agreement is a contract between company insiders and the IPO underwriters that blocks sales for a set period after the offering. Most last 180 days, though terms vary by deal.¹ The point is to keep founders, employees, and early investors from flooding the market with supply on day one.

Lock-ups are contractual, not regulatory. The SEC does not require them, and the underwriter has discretion to grant early releases in unusual cases such as a departing executive or estate planning. When an officer or director gets an early release, the underwriter typically must give the company advance notice and the company must publicly announce the release before it takes effect. Any transferee receiving shares under an early release usually has to agree to the same lock-up terms for the remaining duration.

Clear SEC Rule 144 If It Applies to You

Separate from the contractual lock-up, SEC Rule 144 imposes its own conditions on sales of restricted securities and on any sales by company affiliates — officers, directors, and anyone controlling more than 10 percent of a class of shares. If the company files regular reports with the SEC, you must hold restricted shares for at least six months before selling. If it does not file reports, the minimum is one year.²

Affiliates also face a volume cap regardless of how long they have held the shares. In any three-month period, you cannot sell more than the greater of 1 percent of the outstanding shares of the same class or the average weekly trading volume over the four weeks before you file your Form 144 notice of sale.² For stocks that trade over the counter rather than on a major exchange, only the 1 percent measurement applies. Large holders often have to spread sales across multiple quarters rather than liquidating in one go.

Extra Rules for Officers, Directors, and 10 Percent Holders

If you are an insider, three more restrictions layer on top of the lock-up and Rule 144.

Section 16(a) of the Securities Exchange Act requires officers, directors, and holders of more than 10 percent of any registered class of equity to publicly report changes in ownership on Form 4, typically within two business days. Section 16(b) then requires you to hand back any profit from a purchase and sale, or sale and purchase, of company stock that happens within less than six months. The disgorgement is mechanical. Intent and inside information do not matter. Courts match the lowest purchase price with the highest sale price across all transactions within the window, so you can owe money even on a net-loss basis. The company cannot waive the claim, and any shareholder can bring it on the company’s behalf.

Because insiders routinely possess material nonpublic information, placing a sell order the day the lock-up ends is not always safe. Rule 10b5-1 provides an affirmative defense against insider trading claims for trades executed under a plan adopted in good faith at a time when you did not possess material nonpublic information. The plan sets the share count, price, and date in advance so you have no discretion over the actual trade. Recent amendments added mandatory cooling-off periods between adoption or modification and the first trade, plus limits on how many plans an insider can maintain at once.

Most public companies also close quarterly trading windows around earnings. Violating a blackout can get you fired and expose you to liability under the company’s insider trading policy even if you did not actually possess inside information.

Get Your Shares Into a Brokerage Account

You cannot place a sell order until the shares are sitting in an account that can trade them. Where they are now determines what you have to do.

If your shares are held in street name at an existing brokerage, they are already in the system and ready to trade the moment restrictions lift. Many companies deposit equity compensation shares directly into an account at a designated broker, so vested RSUs or exercised options may already be there.

If your shares are registered directly in your name through the company’s transfer agent under the Direct Registration System, contact the transfer agent and your broker to initiate a transfer. If you hold physical stock certificates, the transfer agent will require a medallion signature guarantee before processing any transfer or sale.³ You can get one from a bank, credit union, or broker-dealer that participates in a recognized medallion program, but non-customers are usually turned away, so plan ahead.

Your brokerage account needs your Social Security number or EIN on file along with your name, address, and date of birth.⁴ Confirm the share classification in the system — whether the shares came from exercised ISOs, vested RSUs, or open-market purchases. That coding drives cost basis and holding period, and errors there create real headaches at tax time.

Place the Sell Order

Once shares are in the account and restrictions have cleared, selling works the same as selling any listed stock. Find the ticker, open a sell ticket, and choose two things carefully.

The first is order type. A market order fills immediately at the best available price. In the volatile weeks after an IPO, a quote of $45 can execute at $43.50. A limit order sets a floor price and only fills if the stock reaches it. The tradeoff is the risk of no fill at all. For large blocks of IPO shares, a limit order usually makes more sense because dumping size into a thin market moves the price against you.

The second is lot selection. If you acquired shares at different times or prices — say you exercised options at $5 and also bought shares later at $30 — your broker will ask which lot you want to sell. That choice sets your cost basis and determines whether the gain is short-term or long-term. Selling the higher-cost lot first cuts your taxable gain. Selling the lot with the longest holding period may qualify for long-term capital gains rates. The default at most brokerages is first in, first out, and that is not always the tax-smart choice.

Review the confirmation screen before submitting: share count, order type, lot selection, estimated proceeds. Once submitted, you can watch the status on your platform as open, partially filled, or executed.

Settlement and Proceeds

After execution, the trade settles on a T+1 basis, meaning cash and share transfer finalize one business day after the trade date.⁵ The SEC shortened the settlement cycle from T+2 to T+1 in May 2024. During that day, your proceeds are pending. After settlement, you can transfer the cash to a linked bank account or reinvest.

You will get a trade confirmation showing the execution price, share count, net proceeds, and any fees. Most major brokers charge zero commissions on standard online equity trades, but sales of restricted stock may carry additional processing fees disclosed at the time of the transaction. Every sell order also incurs a small SEC regulatory fee.

Cost Basis and Holding Period Depend on How You Got the Shares

The type of equity you received drives your tax starting point.

Restricted stock units are the simpler case. When RSUs vest, their fair market value on the vesting date counts as ordinary income and appears on your W-2. That fair market value becomes your cost basis for capital gains when you sell. Your long-term holding period starts on the vesting date, not the grant date. Selling right after an IPO usually produces a small gain above vesting-day basis, but it is still reportable.

Incentive stock options are more complicated. Exercising an ISO is not a taxable event for regular federal income tax, but the spread between your exercise price and the fair market value at exercise can trigger alternative minimum tax. To qualify for the most favorable tax treatment on the eventual sale, you must hold the shares at least two years from the grant date and at least one year from the exercise date. Selling before meeting both is a disqualifying disposition that converts the gain to ordinary income. This is a common expensive mistake at IPOs: the lock-up expires, the shares get sold immediately, and the entire spread gets taxed at ordinary rates.

Capital Gains Rates for 2026

Shares held one year or less produce short-term capital gains, taxed at ordinary income rates. Shares held more than one year produce long-term capital gains at preferential rates.⁶

For 2026, the long-term brackets for single filers are:⁷

0 percent on taxable income up to $49,450 ($98,900 for married filing jointly)
15 percent on taxable income from $49,451 to $545,500 ($98,901 to $613,700 for married filing jointly)
20 percent on taxable income above $545,500 ($613,700 for married filing jointly)

A large IPO sale can push you into the 20 percent bracket for the year even if your salary alone would not. High earners also owe an additional 3.8 percent net investment income tax on the lesser of net investment income or the amount by which modified adjusted gross income exceeds $200,000 for single filers or $250,000 for married couples filing jointly.⁸ That brings the effective maximum federal rate on long-term gains to 23.8 percent. Most states tax capital gains as ordinary income on top of that, from zero in states without an income tax to over 13 percent in the highest.

Watch for AMT If You Exercised ISOs

If you exercised ISOs and held through the IPO, the spread between your exercise price and fair market value at exercise counts as a preference item for the alternative minimum tax. The AMT is a parallel calculation that starts with your income, strips out most deductions, adds preference items back in, and applies its own rate. If the resulting tentative minimum tax exceeds your regular tax, you pay the difference as AMT.⁹

For 2026, the AMT exemption is $90,100 for single filers and $140,200 for married couples filing jointly, with phase-outs beginning at $500,000 and $1,000,000 respectively.⁷ Exercising a large ISO grant at a newly public company, where fair market value might be 10 or 50 times your strike price, can generate a six- or seven-figure AMT hit in a single year.

The minimum tax credit softens the blow. If you pay AMT because of ISO exercises, you can carry that credit forward and use it against regular tax liability in future years when your tentative minimum tax drops below your regular tax. You claim it on Form 8801.⁹ The credit carries forward indefinitely, so you eventually recoup the overpayment, but recovery can take years. Staging ISO exercises around the IPO instead of doing them all at once is one of the highest-value planning moves available.

Don’t Trigger a Wash Sale

If you sell IPO shares at a loss and buy substantially identical stock within 30 days before or after the sale, the IRS disallows the loss under the wash sale rule.¹⁰ The disallowed loss gets added to the cost basis of the replacement shares, so the deduction is deferred rather than lost.

This catches more IPO sellers than expected. Stock drops after the lock-up expires, you sell at a loss, you buy back a few weeks later hoping for a rebound, and the repurchase within the 61-day window kills the deduction. To harvest the loss and stay invested, wait the full 30 days after selling before repurchasing, or hold a different company’s stock during the gap.

Check Whether Your Shares Qualify as QSBS

If you got your shares when the company was a small C corporation with aggregate gross assets of $50 million or less, they may qualify as qualified small business stock under Section 1202. The payoff is significant: a full exclusion of gain from federal income tax up to the greater of $10 million or 10 times your adjusted basis in the stock.¹¹

The holding period depends on when you acquired the stock. For shares acquired after the applicable date under the One Big Beautiful Bill Act (July 4, 2025), the exclusion phases in on a graduated schedule: 50 percent of gain excluded after three years of holding, 75 percent after four years, and 100 percent after five years. The lifetime cap for post-OBBB shares increased to $15 million.¹¹ Shares acquired before that date follow the prior rules requiring more than five years of holding for the exclusion.

If your shares might qualify, do not sell before you have held them long enough to claim the exclusion. The difference between selling at four years and eleven months versus five years and a day can be hundreds of thousands of dollars.

Report the Sale on Your Tax Return

Your brokerage will send Form 1099-B by mid-February of the year after you sell, reporting gross proceeds and, in most cases, cost basis for each transaction.¹² Check the reported basis carefully. Brokerages frequently get ISO and RSU basis wrong, especially when shares were transferred between platforms or exercises happened at multiple prices.

You report each sale on Form 8949, which captures the shares sold, dates acquired and sold, proceeds, cost basis, and any adjustments.¹³ Totals from Form 8949 flow to Schedule D, where short-term and long-term gains are netted and the tax is calculated.⁶ If the 1099-B shows basis was reported to the IRS and you have no adjustments, you can enter totals directly on Schedule D without itemizing on Form 8949, though IPO shares with complicated basis histories rarely qualify for that shortcut.

Failing to report a sale that shows up on a 1099-B is one of the fastest ways to trigger IRS correspondence. Even if you owe no tax because basis equals or exceeds proceeds, the IRS matches 1099-B data against your return and sends a notice when the numbers do not reconcile. Report every transaction, claim every legitimate basis adjustment, and keep the original option grants, exercise confirmations, and vesting statements in case the IRS asks.

1
U.S. Securities & Exchange Commission. Initial Public Offerings, Lockup Agreements
2
U.S. Securities & Exchange Commission. Rule 144: Selling Restricted and Control Securities
3
Investor.gov. Medallion Signature Guarantees: Preventing the Unauthorized Transfer of Securities
4
Investor.gov. Broker-Dealers: Why They Ask for Personal Information
5
U.S. Securities & Exchange Commission. Shortening the Securities Transaction Settlement Cycle
6
Internal Revenue Service. Topic No. 409, Capital Gains and Losses
7
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
8
Internal Revenue Service. Topic No. 559, Net Investment Income Tax
9
Internal Revenue Service. Topic No. 556, Alternative Minimum Tax
10
Office of the Law Revision Counsel. 26 U.S. Code 1091 – Loss From Wash Sales of Stock or Securities
11
Office of the Law Revision Counsel. 26 USC 1202 – Partial Exclusion for Gain From Certain Small Business Stock
12
Internal Revenue Service. About Form 1099-B, Proceeds From Broker and Barter Exchange Transactions
13
Internal Revenue Service. Form 8949, Sales and Other Dispositions of Capital Assets