Latest filingAug 28, 2026Most recent Form 4
BLLN
BillionToOne, Inc.
NasdaqHealthcareServices-Medical Laboratories
Insider activity for last month from 08/03 to 09/03. 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$114M2 sells
Net open-market-$114M3 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 period19transactions
- J · Other · dominant15 · 79%
- M · Option exercise2 · 11%
- S · Open-market sells2 · 11%
Activity by reported role
A joint filing can contribute to multiple roles19transactions
- Director · dominant15 · 79%
- CTO3 · 16%
- SLO1 · 5%
Distinct insiders active
Reporting-owner CIKs by month · peak Aug 2026 (3)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeKolluri Krishna KittuClass A Common Stock · Indirect · See Footnote
169,550Aug 26, 2026
Tsao DavidClass A Common Stock · Direct
1,000Aug 25, 2026
Ten Bosch John RoderickClass A Common Stock · Direct
26,467Aug 25, 2026
Tsao DavidStock Option (right to buy) · Direct
580,000Aug 25, 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 03 → Sep 03
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Top insiders
By absolute net value across the selected period- TD-$1.0M
- TR-$141.7k
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
BLLN 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| BLLN | Tsao David | CTO | sale10b5-1 | 10.0k | -$100M | S | — | 08/28 | 08/25 | |
| BLLN | ten Bosch John Roderick | SLO | sale10b5-1 | 1.41k | -$14.1M | S | — | 08/28 | 08/25 |
BillionToOne, Inc. Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at BillionToOne, Inc.?
KOLLURI KRISHNA KITTU, Tsao David, ten Bosch John Roderick.
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?
Tsao David reported a sale on Aug 25, 2026 valued at $100M. Read the SEC filing.
What is the recent purchase and sale balance?
Net open-market selling in the selected period was $1,141,700.00. 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.