Buying stock in your own company is legal, and for most employees it is routine. You can purchase shares on the open market through any brokerage account if your employer is publicly traded, or acquire them through company-sponsored plans like an ESPP, stock options, or RSUs. The complications sit around the purchase, not in it: insider trading law, company trading windows, tax rules that differ by plan type, and reporting duties for senior insiders. Getting those wrong is where employees run into trouble.
Public Company vs. Private Company
If your employer’s shares trade on an exchange, you buy them the same way any outside investor would. Open a brokerage account, place an order during market hours, and you own the stock. No special permission is required beyond the insider trading and disclosure rules discussed below.
Private companies work differently. Shares don’t trade on an exchange, so there is no open market to tap. Purchases happen through internal programs, tender offers, or equity compensation plans that the company controls. Most private companies impose transfer restrictions, repurchase rights if you leave, and board approval requirements before you can buy or sell. Liquidity is limited by design. If you work for a private company, the shareholder agreement and plan documents govern what you can do far more than federal securities law does.1Cornell Law School. Securities Act of 1933
The Real Risk Is What You Know When You Buy
The biggest legal exposure is not the purchase itself but the information you hold at the time. Under SEC Rule 10b-5, buying or selling securities while in possession of material, non-public information is illegal.2LII / Legal Information Institute. Rule 10b-5 Information is “material” if a reasonable investor would consider it important to a trading decision. It is “non-public” until it has been released through official channels like an earnings report or press release.
This applies to everyone in the company, from the CEO to a warehouse associate. If your job gives you early access to revenue figures, a pending acquisition, or a product recall, you cannot trade until the information is public. The SEC looks at what you knew, not what your title was.3Cornell Law School. Securities Exchange Act of 1934
Penalties are heavy. Civil fines can reach three times the profit gained or loss avoided.4Office of the Law Revision Counsel. 15 USC 78u-1 – Civil Penalties for Insider Trading Criminal convictions carry up to 20 years in prison, with individual fines up to $5 million and corporate fines up to $25 million.5Office of the Law Revision Counsel. 15 USC 78ff – Penalties The SEC also routinely seeks disgorgement of any profits earned.
Trading Windows, Blackouts, and 10b5-1 Plans
Most public companies don’t leave employees to interpret insider trading law on their own. They define trading windows when employees may buy or sell and blackout periods when trading is prohibited. Blackouts typically begin two to four weeks before quarter-end and run until one or two full trading days after earnings are released. Violating a company blackout is usually a fireable offense on top of any regulatory exposure.
A Rule 10b5-1 plan is the standard tool for insiders who want to trade on a predictable schedule. The plan locks in the dates, quantities, and prices (or formulas) in advance, before the insider has any material non-public information. Trades that execute under a valid plan get an affirmative defense against insider trading charges. SEC rule changes that took effect in 2023 require a cooling-off period before the first trade under a new or modified plan, a good-faith certification from directors and officers, and limits on running overlapping plans or repeated single-trade plans.6SEC.gov. Rule 10b5-1 Insider Trading Arrangements and Related Disclosure A valid plan generally lets trades execute during company blackouts, but some employers restrict even 10b5-1 trades in those windows, so read your company’s insider trading policy before assuming otherwise.
The Different Ways Employees Buy Company Stock
Most equity in employer stock comes through company-sponsored plans rather than open-market purchases. The tax treatment varies significantly.
Employee Stock Purchase Plans
An ESPP lets you set aside a portion of each paycheck on an after-tax basis to buy company stock at a discount, typically 5 to 15 percent below fair market value.7Morgan Stanley. Confused About Your ESPP? Here’s What You Need to Know Federal tax law caps ESPP purchases at $25,000 worth of stock per calendar year, measured by the fair market value on the grant date. Contributions above that limit are refunded.8Fidelity Investments. Employee Stock Purchase Plan Contribution Limits
Incentive Stock Options (ISOs)
ISOs give you the right to buy shares at a fixed strike price. If you hold the shares at least two years from the grant date and one year from the exercise date, the profit is taxed as long-term capital gains instead of ordinary income.9Office of the Law Revision Counsel. 26 USC 422 – Incentive Stock Options
There is a well-known trap. When you exercise an ISO and hold the shares, the spread between your strike price and the stock’s fair market value at exercise is a preference item for the Alternative Minimum Tax.10IRS. IRS Releases Tax Inflation Adjustments for Tax Year 2026 A large ISO exercise can push you into AMT and generate a tax bill in the year you exercise, even though you haven’t sold a share. Selling the shares in the same calendar year you exercise avoids the AMT hit, but it also converts the gain to ordinary income and forfeits the ISO tax advantage.
Non-Qualified Stock Options (NSOs)
NSOs work the same way mechanically, but the tax treatment is less generous. On exercise, the spread between strike price and market value is taxed immediately as ordinary income, and your employer withholds income tax and FICA.11eCFR. 26 CFR 1.83-7 – Taxation of Nonqualified Stock Options The income shows up on your W-2. Any additional gain or loss after exercise is a capital gain or loss based on your holding period from the exercise date.
Restricted Stock Units (RSUs)
RSUs are a promise to deliver shares on a future vesting date. You pay nothing to receive them. When they vest, the fair market value of the shares is taxed as ordinary income, with income tax and FICA withheld. Any gain or loss after vesting is capital in nature.
Open-Market Purchases
If you simply want to buy shares of your public employer through your brokerage account, you can. For tax purposes you’re treated the same as any outside investor, with capital gains rates driven by your holding period. Your only additional obligations are following the trading window and insider trading policy, plus Section 16 reporting if you’re an officer, director, or 10 percent owner.
Extra Duties If You’re a Senior Insider
Section 16 of the Securities Exchange Act imposes stricter obligations on directors, officers, and shareholders who own more than 10 percent of a company’s stock.12Office of the Law Revision Counsel. 15 USC 78p – Directors, Officers, and Principal Stockholders Any purchase or sale must be reported on SEC Form 4, filed electronically through EDGAR before the end of the second business day after the trade.13SEC.gov. Form 4 Late filings can bring fines, public reprimands, and enforcement scrutiny. Because Form 4s are public, investors and journalists watch them closely.
Section 16(b) adds the short-swing profit rule. If a director, officer, or 10 percent shareholder buys and sells (or sells and buys) the same company stock within any six-month period, any profit from that round trip belongs to the company. Intent does not matter, and inside information is not required. The company can demand the profit back, and if it doesn’t, any shareholder can sue on the company’s behalf to recover it. Insiders who exercise options and then sell, or sell and then receive new grants, can trip this without realizing it. If you’re subject to Section 16, talk to your company’s legal team before any transaction.
The Wash Sale Trap
Employees who sell company stock at a loss need to watch for the wash sale rule. Under IRC Section 1091, if you sell stock at a loss and acquire substantially identical stock within 30 days before or after the sale, the IRS disallows the loss deduction.14Office of the Law Revision Counsel. 26 USC 1091 – Loss From Wash Sales of Stock or Securities The disallowed loss is added to the cost basis of the replacement shares, so the loss is deferred rather than lost outright.
Employees get caught here more than ordinary investors because so many events count as a purchase: exercising a stock option, an RSU vesting, an ESPP purchase, even a dividend reinvestment. Any of those inside the 61-day window around a loss sale triggers the rule. Vesting and ESPP purchase dates are set in advance and can collide with a loss sale you didn’t plan around them. Check your company’s equity calendar before selling shares at a loss.
Concentration Risk
Between ESPPs, RSUs, options, and 401(k) company matches, employer stock can quietly become the largest position in your portfolio. Financial planners commonly flag anything above 10 to 15 percent of your investable assets in a single stock as a concentration risk. The problem is that the same company paying your salary also holds a large share of your savings. If it hits serious trouble, you can lose income and portfolio value at the same time. Employees at companies that collapsed have seen retirement accounts wiped out for exactly this reason.
Diversifying doesn’t mean selling every share the day it vests. Building a deliberate plan to trim employer stock over time, especially as it appreciates, keeps you from being overexposed to an outcome you can’t control. A 10b5-1 plan or a scheduled post-vesting sale program can manage this without conflicting with trading windows.