Stocks · Healthcare · Biotechnology
Korro Bio, Inc. KRRO
$9.64 -0.72% Close, Oct 2, 2026 · NASDAQ · Market cap $96.0M
Weak trendExpensive vs sectorHigh risk
Next earnings report: Nov 11, 2026
Scroll or pinch to zoom, drag to move. Daily prices adjusted for splits. Markers: E = earnings (green beat, red miss), S = split, D = dividend.
Three things to know
- Operating margin narrowed to -3176.6% from -1569.1% a year earlier.
- The diluted share count rose 87.6% in a year.
- Revenue over the last four quarters was $2.4M, down 62.1% from a year earlier, slowing from -20.3% a quarter earlier.
PromtFinance scores
Each score is a percentile within the Healthcare sector (0–100). Under each score: how the stock ranks in its sector on every component. As of Oct 5, 2026.
How fast revenue, earnings and cash flow are growing.
- Revenue growth (TTM, YoY)Bottom 9%
- Revenue growth accelerationBottom 7%
Returns on capital, margins, earnings quality and balance-sheet strength.
- Return on invested capitalBottom 26%
- Gross marginTop 39%
- Operating marginBottom 9%
- Accruals (lower is better)Top 10%
How cheap the shares are relative to earnings, cash flow and their own history.
- Earnings yieldBottom 6%
- Free-cash-flow yieldBottom 5%
- EBITDA / enterprise valueBottom 9%
- Sales / enterprise valueBottom 13%
Strength and persistence of the price trend, including versus the S&P 500.
- 12-month return excluding last monthBottom 1%
- 6-month returnBottom 16%
- 1-year return vs S&P 500Bottom 1%
- Distance from 52-week highBottom 2%
- Trend checklist (0–4)Bottom 38%
Earnings surprises and analyst sentiment (estimate-revision history is being collected).
- Average EPS surprise, last 4 quartersBottom 17%
- Consecutive EPS beatsBottom 49%
- Share of analysts rating BuyTop 38%
- Upside to consensus price targetBottom 47%
Low volatility, shallow drawdowns, low market sensitivity and modest leverage.
- Volatility, 60 days (lower is better)Bottom 22%
- Maximum drawdown, 3 yearsBottom 7%
- Beta vs S&P 500 (lower is better)Bottom 3%
What changed
Latest four quarters versus the same period a year earlier (growth: versus one quarter earlier).
| Measure | Before | Now | |
|---|---|---|---|
| Revenue growth (YoY) | -20.3% | -62.1% | ↓ |
| Gross margin | 100.0% | 72.8% | ↓ |
| Operating margin | -1569.1% | -3176.6% | ↓ |
| FCF margin | -1175.9% | -2865.9% | ↓ |
Fundamental momentum
| Measure | Now (TTM) | Year / quarter before | Sector rank | |
|---|---|---|---|---|
| Revenue growth (TTM, YoY) | -62.1% | -20.3% | ↓ | Bottom 9% |
| Gross margin | 72.8% | 100.0% | ↓ | Top 39% |
| Operating margin | -3176.6% | -1569.1% | ↓ | Bottom 9% |
| Net margin | -4477.1% | -1454.5% | ↓ | — |
| Free-cash-flow margin | -2865.9% | -1175.9% | ↓ | — |
| Return on invested capital | -49.2% | — | Bottom 26% |
Quality of earnings and balance sheet
- Accruals (net income − OCF) / assetsLower is better; high accruals can signal weaker earnings quality.
- -23.7%
- Stock-based compensation / revenueA cost to shareholders through dilution.
- 315.1%
- Receivables growth vs revenue growthReceivables growing much faster than sales can be a warning.
- -37.9 pp
Shareholder returns
- Dividend yield (dividends paid, TTM)
- 0.00%
- Net buyback yield (TTM)
- -89.42%
- Shareholder yield
- -89.42%
- Share count change, 1 year
- +87.6%
- Share count change, 3-year CAGR
- +46.8%
Shareholder yield = dividends + net buybacks over the last four quarters, divided by market cap.
Based on the four quarters through Jun 30, 2026 (filed Aug 6, 2026).
Earnings and expectations
Earnings momentum
- Consecutive EPS beats
- 1
- Beats in the last 8 reports
- 5 of 8
- Average EPS surprise, last 4
- -33.7%
- Average 2-day reaction, last 8
- -2.4%
- Positive 20 days after report
- 3 of 8
Analysts
- Consensus price target
- $15.00
- Target vs current price
- +55.6%
- Analysts with a rating
- 12
- Share rating Buy or Strong Buy
- 83%
- Consensus rating
- Buy
How the stock reacted to recent reports
| Report date | EPS surprise | 2 days | 5 days | 20 days | 60 days |
|---|---|---|---|---|---|
| Aug 6, 2026 | +20.1% | +5.4% | +16.1% | +4.1% | — |
| May 7, 2026 | -5.6% | -3.4% | -16.0% | -16.2% | -19.5% |
| Mar 12, 2026 | -175.6% | -2.2% | -3.0% | +11.2% | -8.8% |
| Nov 12, 2025 | +26.4% | -4.2% | -81.0% | -76.1% | -61.2% |
| Aug 12, 2025 | -7.9% | +6.2% | +31.0% | +140.0% | +124.9% |
| May 7, 2025 | +4.2% | -5.9% | +5.1% | -19.7% | -6.4% |
| Mar 18, 2025 | +3.0% | -3.6% | -4.1% | -48.8% | -40.7% |
| Nov 12, 2024 | +11.4% | -11.4% | -36.6% | -36.4% | -56.1% |
Returns from the close before each report. Past reactions do not determine future ones.
Earnings history
| Report date | EPS | Estimate | Surprise | Revenue |
|---|---|---|---|---|
| Aug 6, 2026 | -$1.07 | -$1.34 | +20.1% | $1.5M |
| May 7, 2026 | -$1.69 | -$1.60 | -5.6% | — |
| Mar 12, 2026 | -$5.32 | -$1.93 | -175.6% | $1.3M |
| Nov 12, 2025 | -$1.92 | -$2.61 | +26.4% | $1.1M |
| Aug 12, 2025 | -$2.74 | -$2.54 | -7.9% | $1.5M |
| May 7, 2025 | -$2.49 | -$2.60 | +4.2% | $2.5M |
| Mar 18, 2025 | -$2.26 | -$2.33 | +3.0% | $2.3M |
| Nov 12, 2024 | -$2.26 | -$2.55 | +11.4% | — |
Valuation in context
| Multiple | Now | 5-year median | 5-year percentile | Sector rank (cheapness) |
|---|---|---|---|---|
| EV / Sales | 47.55× | — | — | Bottom 13% |
| Free-cash-flow yield | -71.15% | — | — | Bottom 5% |
| Earnings yield | -103.84% | — | — | Bottom 6% |
Technical state
Trend checklist
- ✗ Price above 20-day average
- ✗ Price above 50-day average
- ✗ Price above 200-day average
- ✓ 50-day average above 200-day
- ✗ MACD histogram positive
Trend quality
- Days above the 50-day average
- 0
- Days above the 200-day average
- 0
- 50-day average slope (20 days)
- -5.6%
- 200-day average slope (20 days)
- +4.3%
- Distance from 50-day average
- -19.2%
- Distance from 200-day average
- -17.5%
- RSI (14)
- 34.6
- Relative volume
- 0.74×
Risk and drawdowns
- Volatility, 60 days (annualized)
- 75.0%
- Volatility vs own 5-year history
- 16th percentile · Low for this stock
- Beta vs S&P 500 (2 years, weekly)
- 2.88
- Correlation with S&P 500
- 0.30
- Current drawdown from 1-year high
- -81.2%
- Maximum drawdown, 3 years
- -94.1%
Largest declines in the past six years
| From peak | To low | Decline | Length | Recovery |
|---|---|---|---|---|
| Feb 19, 2021 | Dec 2, 2025 | -99.8% | 1202 days | Not yet recovered |
| Dec 16, 2020 | Dec 21, 2020 | -20.8% | 3 days | 25 days (Jan 28, 2021) |
Declines of 10% or more from a closing high, measured on daily closes.
Financial statements
- Market cap
- $96.0M
- EPS, diluted (TTM)
- -$10.01
- Revenue (TTM)
- $2.4M
- 52-week range
- $5.20 – $55.89
| FY 2021 | FY 2022 | FY 2023 | FY 2024 | FY 2025 | |
|---|---|---|---|---|---|
| Revenue | $0 | $0 | $0 | $2.3M | $6.4M |
| Gross profit | $0 | $0 | $0 | $2.3M | $2.1M |
| Operating income | -$35.5M | -$59.0M | -$84.5M | -$91.9M | -$87.3M |
| Net income | -$22.0M | -$58.0M | -$81.2M | -$83.6M | -$117.3M |
| EPS (diluted) | -$4.94 | -$227.42 | -$53.08 | -$9.37 | -$12.48 |
| Q3 2024 | Q4 2024 | Q1 2025 | Q2 2025 | Q3 2025 | Q4 2025 | Q1 2026 | Q2 2026 | |
|---|---|---|---|---|---|---|---|---|
| Revenue | $0 | $2.3M | $2.5M | $1.5M | $1.1M | $1.3M | $0 | $0 |
| Net income | -$21.0M | -$21.2M | -$23.4M | -$25.8M | -$18.1M | -$50.0M | -$19.6M | -$18.9M |
| EPS (diluted) | -$2.26 | -$2.26 | -$2.49 | -$2.74 | -$1.92 | -$5.33 | -$1.69 | -$1.07 |
| FY 2021 | FY 2022 | FY 2023 | FY 2024 | FY 2025 | |
|---|---|---|---|---|---|
| Operating cash flow | -$32.1M | -$53.6M | -$67.3M | -$60.1M | -$78.6M |
| Capital expenditure | -$4.4M | -$5.2M | -$7.8M | -$17.9M | -$518,000 |
| Free cash flow | -$36.5M | -$58.9M | -$75.1M | -$78.0M | -$79.1M |
| Dividends paid | $0 | $0 | $0 | $0 | $0 |
| Net share buybacks | $28,000 | $62,000 | $117.3M | $67.4M | $685,000 |
Cash outflows are shown as negative numbers.
- Cash and short-term investments
- $115.0M
- Total assets
- $163.4M
- Total liabilities
- $60.2M
- Total debt
- $42.2M
- Net debt
- $17.3M
- Shareholders’ equity
- $103.2M
As of Jun 30, 2026 (filed Aug 6, 2026).
Short interest
- Shares sold short
- 1,551,984
- Days to cover
- 11.91
- Change vs previous report
- +4.6%
FINRA short interest, settlement date Sep 15, 2026.
Stock splits
- Nov 6, 2023
- 1-for-50