Latest filingSep 10, 2026Most recent Form 4
KRRO
Korro Bio, Inc.
NasdaqHealthcarePharmaceutical Preparations
Insider activity for last month from 08/10 to 09/10. Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total buying$00 buys
Total selling$50.2M6 sells
Net open-market-$50.2M2 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period6transactions
- S · Open-market sells · dominant6 · 100%
Activity by reported role
A joint filing can contribute to multiple roles6transactions
- Director · dominant4 · 67%
- SVP2 · 33%
Distinct insiders active
Reporting-owner CIKs by month · peak Aug 2026 (1)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeFormela Jean FrancoisCommon Stock · Indirect · See footnote
141,002Aug 26, 2026
Dolan OliverCommon Stock · Direct
16,246Sep 09, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 10 → Sep 10
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Top insiders
By absolute net value across the selected period- FF-$398.6k
- DO-$99.4k
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
KRRO transaction history
Filters apply within this company and selected period by default| Ticker | Insider | Role | Type | Shares | Value | Code | Signals | 90d return | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|---|
| KRRO | Dolan Oliver | SVP | sale10b5-1 | 6 | -$8.16k | S | — | 0.0% | 09/10 | 09/09 |
| KRRO | Dolan Oliver | SVP | sale10b5-1 | 7.34k | -$9.92M | S | — | 0.0% | 09/10 | 09/08 |
| KRRO | FORMELA JEAN FRANCOIS | DIR | sale10b5-1 | 4.88k | -$6.83M | S | −2.0% | 08/21 | 08/19 | |
| KRRO | FORMELA JEAN FRANCOIS | DIR | sale10b5-1 | 23.5k | -$33.0M | S | −2.0% | 08/21 | 08/19 |
Korro Bio, Inc. Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at Korro Bio, Inc.?
Dolan Oliver, FORMELA JEAN FRANCOIS.
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
Dolan Oliver reported a sale on Sep 09, 2026 valued at $8.16k. Read the SEC filing.
What is the recent purchase and sale balance?
Net open-market selling in the selected period was $502,107.51. Sales can occur for many non-investment reasons.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.