Korro Bio, Inc.
KRRO Healthcare Biotechnology
Korro Bio, Inc.’s revenue for fiscal 2025 (year ended December 2025) was $6.4 million, up 181.5% from fiscal 2024. In the quarter to June 2026, revenue fell 86.3%, EPS grew 61.0% and free cash flow grew 12.1%, each against the same quarter a year earlier. Insiders bought in the last twelve months.
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Korro Bio, Inc. (KRRO) Piotroski F-score
Korro Bio, Inc.'s Piotroski F-score for fiscal 2025 cannot be worked out: needs three fiscal years.
Piotroski F-score, annual
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Annual newest first
| Period | Piotroski F-score | Change (points) |
|---|---|---|
| FY2021 | 2 | — |
How fiscal 2025’s score is made up
| Test | This year | Year before | Result | Points |
|---|---|---|---|---|
| Positive return on assets | (69.03%) | — | Fail | 0 |
| Positive operating cash flow | (78.56m) | (60.07m) | Fail | 0 |
| Rising return on assets | (69.03%) | — | n/a | — |
| Cash flow above net income | 38.70m | 23.51m | Pass | 1 |
| Falling long-term leverage | 0.00 | — | n/a | — |
| Rising current ratio | 6.90 | 8.79 | Fail | 0 |
| No new shares issued | 9,395,000 | 8,921,000 | Fail | 0 |
| Rising gross margin | 100.00% | 100.00% | Fail | 0 |
| Rising asset turnover | 0.04 | — | n/a | — |
| Piotroski F-score | n/a — needs three fiscal years | — | ||
How the Piotroski F-score works
One point for each of nine tests, this fiscal year against the one before: positive return on assets, positive operating cash flow, rising return on assets, cash flow above net income, falling long-term leverage, a rising current ratio, no new shares issued, a rising gross margin and rising asset turnover. The ratios are the ones on this site, so each can be checked.
Joseph Piotroski (2000) called 8–9 high and 0–1 low; reading it in three bands is the common convention:
| 7–9 | Strong — most fundamentals improved |
|---|---|
| 4–6 | Mixed |
| 0–3 | Weak — most fundamentals deteriorated |
Where this differs from the paper: return on assets is on average rather than beginning-of-year assets, and weighted basic shares stand in for shares issued. The score is shown only when all nine tests can be worked out, which takes three fiscal years; banks and insurers, which report no current assets or gross profit, have none.
Piotroski F-score against peers
| Company | Piotroski F-score |
|---|---|
| CUE Cue Biopharma, Inc. compare | 5 |
| MOLN Molecular Partners AG Sponsored ADR compare | 2 |
| NKTX Nkarta, Inc. compare | — |
| ALXO ALX Oncology Holdings Inc. compare | — |
| AVXL Anavex Life Sciences Corp. compare | — |
| TLSA Tiziana Life Sciences Ltd compare | — |
| ANTX AN2 Therapeutics, Inc. compare | — |
| TARA Protara Therapeutics, Inc. compare | — |
| KRRO Korro Bio, Inc. | — |
What Piotroski F-score is
The Piotroski F-Score tells an investor how many signs of improving profitability, funding and efficiency a company shows against a year earlier.
One point for each of nine tests against a year earlier: positive return on assets, positive operating cash flow, rising return on assets, cash flow above net income, falling long-term leverage, rising current ratio, no new shares issued, rising gross margin, and rising asset turnover