2021-07-28 to 2026-07-27
COST · Retail · What-if investment math · Idle funds research
What If I Invested $1,000 in Costco Stock?
See how a past Costco investment could have performed, then decide how to deploy idle funds now. Historical COST results and forward automated trading scenarios are kept clearly separate.
Current COST market context
Recent Costco context for a what-if comparison
COST last closed at $951.58 on 2026-07-27, and fell 0.1% over roughly one month from $952.54.
Across the observed 5 years window, Costco produced a +17.7% annualized return and a 31.51% maximum closing-price drawdown. For this retail asset, that recent move should be read beside the full stress history rather than treated as proof that the membership retail compounder thesis will continue.
Use the dated market move as context, then enter your actual purchase and comparison prices for the personal COST result.
UBI Scenario Score69/100High-upside profile
Passive base case+17.7%annual scenario model
Stress drawdown-31.51%Lower stress history
Source seriesNasdaq primary2026-07-27
Calculator coverage5 periods · 5 yearsSourced historical periods
Asset typeStockCOST
COST historical investment calculator
How much would $100, $1,000 or $10,000 invested in Costco be worth?
Choose a sourced historical period and enter any starting amount. The result uses Nasdaq historical data closing prices and excludes taxes, fees and any distributions not reflected in the price series.
2025-07-28 to 2026-07-27
Nasdaq primary
Popular historical amounts
Original investment$0
Historical value$0
Gain / loss$0
Total return+0.0%
Based on COST closing prices from 2021-07-28 to 2026-07-27. Past performance does not predict future returns.
Costco historical returns for common investment amounts
| Amount invested | 1 year 2025-07-28 | 2 years (annualized) 2y annualized | 3 years 2023-07-27 | 4 years (annualized) 4y annualized | 5 years 2021-07-28 |
|---|---|---|---|---|---|
| $100 | $102 +1.9% total return | $138 +38.4% total return | $169 +69.4% total return | $192 +91.7% total return | $225 +125.4% total return |
| $1,000 | $1,019 +1.9% total return | $1,384 +38.4% total return | $1,694 +69.4% total return | $1,917 +91.7% total return | $2,254 +125.4% total return |
| $10,000 | $10,188 +1.9% total return | $13,844 +38.4% total return | $16,937 +69.4% total return | $19,165 +91.7% total return | $22,538 +125.4% total return |
These amount-based examples target common questions such as “what if I invested $100 in Costco?” and “what would $10,000 in COST be worth?”
Exact-price COST calculator
What would your personal Costco investment be worth now?
The price fields start with the sourced observation-window prices. Enter your actual investment amount to calculate units, value, gain or loss and total return.
Popular exact-price amounts
COST units owned0
COST position value$0
COST gain / loss$0
COST total return+0.0%
The defaults use sourced prices dated 2021-07-28 and 2026-07-27. Verify both prices independently; this result remains separate from the forward-looking automated trading comparison.
From hindsight to a new decision
What should the next idle dollar do?
The past COST result cannot be repeated on demand. Use it to understand volatility and opportunity cost, not as proof that buying today will create the same return.
A new allocation can stay in cash, enter a diversified portfolio, buy Costco, or test an automated strategy at a deliberately limited size.
What changes the answer?
Amount, date and time horizon matter
A $100 investment and a $10,000 investment experience the same percentage return but very different dollar gains and losses. The purchase date can matter just as much.
That is why this page supplies both preset periods and an exact-price calculator.
COST idle-funds scenario calculator
Model Costco first, then consider Aurum below
After calculating the historical COST result, use the same starting capital to test a new Costco scenario and a separate automated trading assumption.
Popular forward-test amounts
Total capital contributed$0
COST modeled value$0
COST modeled gain / loss$0
This forward model compounds an editable +17.7% annual COST assumption. It is separate from the sourced historical calculator above.
Default forward scenario in static HTML
| Path | Default assumption | Total contributed | Modeled value after 3 years | Modeled gain / loss |
|---|---|---|---|---|
| Costco | +17.7% annual COST scenario | $0 | $0 | $0 |
| Aurum automated trading | 14% monthly reported-history scenario | $0 | $0 | $0 |
This static table mirrors the calculator's default inputs so search crawlers and AI answer engines can read the result without executing JavaScript.
Ways to deploy $10,000 after reviewing Costco's history
| COST or alternative path | Asset-specific assumption | Stress / annual return | $10,000 after 3 years |
|---|---|---|---|
| Costco bear case | COST repeats its observed maximum drawdown once, then remains flat | -31.5% | $6,849 |
| Costco base case | COST delivers the modeled retail return | +17.7% | $16,289 |
| Costco bull case | COST benefits from strong demand for retail exposure | +33.4% | $23,750 |
| Automated trading scenario | Reported 14% monthly platform average applied to the same starting capital | +381.8% | $1,118,342 |
This what if I invested in Costco stock table keeps capital and horizon equal. The bear value applies the historical maximum drawdown once rather than repeating it annually. The automated trading row is reported-history scenario math, not a promise that it will outperform Costco.
Auditable COST whatif inputs
Historical inputs used beside the COST what-if result
| Input | Value | Derivation |
|---|---|---|
| Observation window | 2021-07-28 to 2026-07-27 | daily closing prices from Nasdaq historical data, fetched 2026-07-28. |
| Base case | +17.7% | Annualized return from $422.22 to $951.58 across the stated observation window. |
| Stress case | -31.51% | Largest peak-to-trough decline observed in the same closing-price series. |
| Bull case | +33.4% | Base CAGR plus half the observed maximum drawdown: 17.66% + (31.51% / 2). |
These historical measurements make this COST whatif page reproducible; they do not predict that the asset will repeat the same return or drawdown.
Original UBI.quest analysis
Costco UBI Scenario Score: 69/100
Prepared by the UBI Research Desk and updated 2026-07-28. This is a proprietary comparative scenario model, not an analyst consensus target or a live-data recommendation.
| Model dimension | Score | How it affects the forecast |
|---|---|---|
| Upside capacity · 40% | 71/100 | Normalizes the +17.7% base assumption against the return range used for stocks. |
| Drawdown resilience · 30% | 68/100 | Rewards assets with a smaller modeled stress drawdown. COST's stress input is 31.51%. |
| Thesis conviction · 20% | 69/100 | Combines the editorial strength of the membership retail compounder thesis with its return and risk assumptions. |
| Uncertainty adjustment · 10% | 68/100 | Penalizes scenarios where volatility can overwhelm the expected return. |
| UBI Scenario Score | 69/100 | High-upside profile with moderate-high model confidence. |
Formula: 40% upside capacity + 30% drawdown resilience + 20% thesis conviction + 10% uncertainty adjustment. Read the complete forecast methodology and limitations.
Asset-specific catalysts
What would support the COST case?
- Revenue, earnings and cash-flow execution within retail
- Whether investors continue rewarding the membership retail compounder thesis
- Relative valuation and execution versus sector peers and broad-market alternatives
Cross-asset comparison: Compare the COST thesis with Walmart stock return calculator, Apple stock return calculator, Tesla stock return calculator. Then calculate what a $1,000 COST investment would have become using the same sourced framework.
Risks and invalidation
What would weaken the forecast?
- Valuation compression or weaker operating execution can break the thesis
- A drawdown near the modeled 31.51% stress range
- A broad risk-off market that reduces liquidity and valuation multiples
Invalidation rule: The base case should be reconsidered if COST suffers a drawdown beyond roughly 31.51%, loses relative strength within retail, or the membership retail compounder thesis no longer matches observable revenue, earnings, cash flow or balance-sheet progress.
Evidence to verify before using this forecast
| Evidence area | What to check |
|---|---|
| Company filings | Verify revenue, earnings, cash flow, debt and share-count trends in the latest company filings before relying on the scenario. |
| Valuation | Compare current multiples with the company's own history and relevant retail peers. |
| Estimate direction | Check whether forward expectations are rising or falling; the current UBI score does not ingest licensed analyst-consensus data. |
This evidence checklist is intentionally separate from the score. It prevents a historical or editorial scenario input from being mistaken for a live fundamental or on-chain rating.
External data sources
Costco source register
| Source | Use | Listed |
|---|---|---|
| SEC EDGAR filings | Primary filings, financial statements and company disclosures | 2026-07-28 |
| Nasdaq market data | Quote history, market activity and company summary | 2026-07-28 |
| Yahoo Finance | Price history, statistics and comparable market data | 2026-07-28 |
The scenario audit block above uses the specifically identified Nasdaq historical data; these additional links support broader reader verification. The UBI Scenario Score remains a comparative model rather than a live recommendation.
What if I invested in Costco FAQ
What if I invested $100 in Costco?
The historical table shows $100 across the sourced periods available for COST. Select the period to calculate another amount.
What if I invested $1,000 in Costco five years ago?
If a full five-year series is available, the five-year column answers this directly using dated closing prices. Newer assets show the longest reliable period instead of inventing earlier history.
What if I invested $10,000 in Costco?
Use the $10,000 row for preset historical periods or enter the exact purchase and current prices for a personal result.
How many COST units would my investment have bought?
Divide the original investment by the purchase price. The exact-price calculator performs this calculation and displays the units owned.
How severe was the COST historical downside?
The maximum closing-price drawdown in the sourced scenario window was 31.51%. A future decline could be smaller or larger.
Can past Costco returns predict a new investment or automated trading result?
No. Historical performance answers what happened between two dates. Both the COST forward case and automated trading comparison use assumptions and are not promises.
Final Aurum check
Ready to compare the automated trading route?
The calculator above shows why the Aurum benchmark deserves attention: with the default settings, the automated trading scenario models to $1,118,342 after three years. Before clicking out, review the evidence and decide whether a small sponsored test fits.
Check screenshots, withdrawal context and what the evidence does not prove.
Use a capped amount you can afford to lose and lower the 14% assumption.
Only leave UBI.quest after the risk and platform-flow checks are done.
Review results evidenceSize a small testBack to the COST return calculatorTry Aurum automated trading after checks
Sponsored external link. Verify the platform flow yourself and only test capital you can afford to lose.