Sell CoStar Group (CSGP) stock to fund a goal
Calculator · free · no signup · CSGPNeed cash for a goal? Plan the minimum-tax schedule to sell your vested CoStar Group (CSGP) shares and net a target amount by a target date, across tax years.
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Inputs
Your equity
One stack per ticker (current-employer RSUs, prior-employer holdings, index fund, etc.). Each stack has its own current price, growth assumption, and cost-basis lots.
Drives chance-of-shortfall · default 30%
Lots
Plan
Estimates only. Not financial advice.
Lock-in-now is deterministic (0%). Plans that wait depend on future prices; risk is near-zero when inventory comfortably exceeds the goal. Volatility: each stack's option-implied vol if a ticker is set, otherwise 30%. Lognormal model; real markets have fatter tails.
| Tax | $109,654 | $111,723 | $111,788 | $118,699 |
| Wealth @ target | $718,258 | $716,076 | $713,344 | $710,913 |
| Chance of shortfall | <0.1% | 0% | 1.7% | 3.3% |
Feasible
$400,027 net by 08/01/27
Total tax: $109,654 (federal $58,856, state $36,063, NIIT $14,736)
Schedule · Recommended
| Sale date | Shares | Tax | Net | Cumulative |
|---|---|---|---|---|
| 08/26/26 | 4,088 | $351,349 | $360,067 | |
| 03/31/27 | 4 | $359 | $360,430 | |
| 04/30/27 | 32 | $2,891 | $363,340 | |
| 05/31/27 | 100 | $9,088 | $372,468 | |
| 06/30/27 | 100 | $9,141 | $381,631 | |
| 07/31/27 | 100 | $9,196 | $390,828 | |
| 08/01/27 | 100 | $9,199 | $400,027 |
Risk vs wealth
Each dot is a possible plan. Right is riskier, up is more wealth left over.
Trajectory of cash netted
Solid line = expected. Shaded band = 10th–90th percentile under price uncertainty.
After the plan
You keep 3,476 shares worth $410,758 at the projected target-date price, invested for the next decision.
You solved for a cash target. The beta optimizes your full portfolio across multiple goals and market scenarios, not just one funding need.
Request beta access →Related calculators: RSU Lot Order Calculator · Stock Concentration Calculator · RSU Sell-vs-Hold Calculator
About CoStar Group
CoStar Group (CSGP) is a public Data company, incorporated in Delaware and headquartered in Arlington, VA.
Last close: $27.38 per share (as of 2026-10-03).
Equity grants at CoStar Group typically include restricted stock units (RSUs).
CoStar Group, Inc. is an American provider of information, analytics, and marketing services to the commercial property industry in North America and Europe. Founded in 1987 by Andrew C. Florance and based in Arlington, Virginia, the company operates the CoStar online database and news website and several online marketplaces, including Apartments.com and Homes.com.
Source: Wikipedia (CC BY-SA 4.0)
Andrew Florance founded the company in 1987 to build a commercial real estate database, and its research staff physically verifies property and lease data that is otherwise scattered and private. That proprietary collection is the moat: subscriptions to CoStar Suite are close to mandatory for brokers and appraisers. Apartments.com and, more recently, Homes.com extended the model into residential listings, funded by very large marketing campaigns. Residential expansion is the expensive bet on an established data business. Headquarters are in Arlington, Virginia.
Sources: sec.gov · en.wikipedia.org
Equity comp at CoStar Group
- In January 2026, CoStar Group adopted a new Executive Severance Plan covering officers at Vice President level and above. An involuntary termination alone provides base severance, but full equity (RSU) vesting acceleration applies only if the termination occurs during a defined change-in-control protection period, meaning acceleration requires both a change in control and a qualifying termination (double trigger), not a change in control alone. In February 2026, amid a proxy fight with activist investors, CoStar removed a clause that treated a majority change in the board's composition as a change in control, while leaving the double-trigger vesting mechanics unchanged.
- Early exercise is not allowed: you have to wait for shares to vest before you can buy them.
- RSUs use double-trigger vesting. Two things must both happen before the shares are yours: (1) the normal time-based vesting completes, and (2) the company has a liquidity event (an IPO or an acquisition). Until both happen, you do not yet own the shares and you do not owe tax on them.
Sources: sec.gov · sec.gov · stocktitan.net
Researched 2026-08-21.
OptionsAhoy is an independent tool and is not affiliated with, endorsed by, or sponsored by CoStar Group.
If you hold vested CoStar Group (CSGP) shares and need a set amount of cash by a date (a house down payment, tuition, a sabbatical, a business buy-in), the question is which lots to sell and in which tax years to keep the most after tax. This calculator builds the minimum-tax sell schedule across your lots, accounting for federal long-term capital gains, the net investment income tax, and your state.
Example: a 5,000-share CSGP position at $27.38 is worth $136,900. Say you need $150,000 of it for a house down payment by next spring. Selling enough shares all in one tax year can push the gain into the higher long-term capital-gains bracket and trigger the 3.8% net investment income tax; spreading the sale across two tax years often nets more. The calculator above finds the minimum-tax sell schedule across your specific lots, basis, goal, and date.
All CoStar Group tools → · Use the generic Stock Sale Funding Calculator for any company.
CoStar Group equity questions
- How much CSGP stock do I sell to fund a goal without overpaying tax?
- It depends on your cost basis, your target amount and date, and how the sale spreads across tax years. Selling vested CSGP shares triggers long-term capital-gains tax, plus the 3.8% net investment income tax and state tax above certain income, and bunching a large sale into one year can push the gain into a higher bracket. The calculator above builds the minimum-tax sell schedule across your lots to net your target amount by your date.
- Does CoStar Group grant ISOs, NSOs, or RSUs?
- Equity compensation at CoStar Group typically takes the form of restricted stock units (RSUs). Restricted stock units are taxed as ordinary income when they vest.
- Does CoStar Group allow early exercise of stock options?
- No. CoStar Group requires options to vest before you can exercise them, so the holding-period clock for long-term capital-gains treatment starts as each tranche vests and you exercise it.
- Do CoStar Group RSUs use double-trigger vesting?
- Yes. CoStar Group restricted stock units (RSUs) vest only when two things both happen: the time-based schedule completes, and the company has a liquidity event such as an initial public offering (IPO) or an acquisition. Until both occur you do not own the shares and owe no tax on them.
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