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BLLN · Billiontoone, Inc.
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BLLN BillionToOne (BLLN) Insider Trading, Ownership & Congress Trades

Healthcare Services · Services-medical laboratories · CIK 0002070849
Quote by TradingView
Form 144 · 30
Insider buyers, 180 days
0
House members buying, 1 year
0
STOCK Act, US House only, disclosed up to 45 days after the trade
Funds added, last quarter
128
13F, latest reported quarter
Conversions, 180 days
39
Codes C/M, not in net · $1.6M priced

What the filings say about BLLN

Insiders, 180 days
-$48.2M net sold
6 sellers · 37% of sales under a 10b5-1 plan
Planned sales (Form 144), 90 days
$30.8M
30 notices

BillionToOne insider trades (Form 4)

Form 4 buys and sells (codes P and S). Grants, option exercises and conversions excluded.

Over the last 180 days, BillionToOne, Inc. insiders sold a net $48.2M of stock across 179 Form 4 purchases and sales, with no insider buying. Source: SEC Form 4 filings, as of 2026-10-27.

Insider
Filed
Shares
Value
Since filing
Atay Oguzhan
Chairman and CEO
SELL
2026-10-16 SECtraded 2026-10-15
900
$88.6K
+10.3%
Context
  • 79 earlier Form 4 trades (code P or S) here by this insider (79 sales), the last on Oct 14, 2026.
  • The trade is 21.2% of the 4,250 shares held after it.
  • 3 other insiders sold within 30 days.
  • 128 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chairman and CEO Atay Oguzhan sold about $88.6K of BLLN under a 10b5-1 plan on Oct 15, 2026; 3 other insiders sold within 30 days and 128 funds added in the latest 13F quarter.
Atay Oguzhan
Chairman and CEO
SELL
2026-10-16 SECtraded 2026-10-15
1,861
$185.8K
+10.3%
Context
  • 79 earlier Form 4 trades (code P or S) here by this insider (79 sales), the last on Oct 14, 2026.
  • The trade is 77.9% of the 2,389 shares held after it.
  • 3 other insiders sold within 30 days.
  • 128 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chairman and CEO Atay Oguzhan sold about $185.8K of BLLN under a 10b5-1 plan on Oct 15, 2026; 3 other insiders sold within 30 days and 128 funds added in the latest 13F quarter.
Atay Oguzhan
Chairman and CEO
SELL
2026-10-16 SECtraded 2026-10-15
1,276
$128.4K
+10.3%
Context
  • 79 earlier Form 4 trades (code P or S) here by this insider (79 sales), the last on Oct 14, 2026.
  • The trade is 114.6% of the 1,113 shares held after it.
  • 3 other insiders sold within 30 days.
  • 128 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chairman and CEO Atay Oguzhan sold about $128.4K of BLLN under a 10b5-1 plan on Oct 15, 2026; 3 other insiders sold within 30 days and 128 funds added in the latest 13F quarter.
Atay Oguzhan
Chairman and CEO
SELL
2026-10-16 SECtraded 2026-10-15
980
$99.8K
+10.3%
Context
  • 79 earlier Form 4 trades (code P or S) here by this insider (79 sales), the last on Oct 14, 2026.
  • The trade is 736.8% of the 133 shares held after it.
  • 3 other insiders sold within 30 days.
  • 128 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chairman and CEO Atay Oguzhan sold about $99.8K of BLLN under a 10b5-1 plan on Oct 15, 2026; 3 other insiders sold within 30 days and 128 funds added in the latest 13F quarter.
Atay Oguzhan
Chairman and CEO
SELL
2026-10-16 SECtraded 2026-10-15
133
$13.7K
+10.3%
Context
  • 79 earlier Form 4 trades (code P or S) here by this insider (79 sales), the last on Oct 14, 2026.
  • 3 other insiders sold within 30 days.
  • 128 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chairman and CEO Atay Oguzhan sold about $13.7K of BLLN under a 10b5-1 plan on Oct 15, 2026; 3 other insiders sold within 30 days and 128 funds added in the latest 13F quarter.
179 transactions on record
Since filing: total return from the first close after the filing to the latest close, dividend-adjusted. Not a forecast.
Context lines are counts over the filings above and returns from our own price history, never a price level. Not investment advice.
See all insider buying · insider selling
Showing the latest few. to see 174 more transactions and use the screener and CSV export. We store only your email; there is no password.
Seven facts, ranked against the sector · Rank is not a forecast
Insiders
net -$48.2M over 180 days
-$28.4M over 90 days
below 83% of Healthcare Services
Congress
no House purchase disclosed in the last 12 months
Funds
128 funds bought in last quarter
below 53% of Healthcare Services
Revenue
+100.0% year over year
more than 95% of Healthcare Services
Margin
2.4% net margin
more than 59% of Healthcare Services
Buybacks
no share repurchases reported
Short interest
9.8% of the float short (float per yahoo 2026-10-26) · 3.9 days to cover · settled 2026-09-30
What changed in the last 30 days
Oct 16Chairman and CEO Atay Oguzhan sold $4.2M under a 10b5-1 plan (16 trades, Sep 28 to Oct 15)
Why it matters
A 10b5-1 plan schedules trades months ahead, so this says little about what the insider thinks today.
Oct 13Officer Atay Oguzhan filed to sell $1.6M by Oct 12 (Form 144)
Why it matters
A Form 144 is a notice of intent to sell; the sale may not happen, and it says nothing about the price.
Oct 7Chief Technology Officer Tsao David sold $2.6M under a 10b5-1 plan (12 trades, Sep 24 to Oct 5)
Why it matters
A 10b5-1 plan schedules trades months ahead, so this says little about what the insider thinks today.
Oct 5Officer Tsao David filed to sell $2.2M by Oct 5 (Form 144)
Why it matters
A Form 144 is a notice of intent to sell; the sale may not happen, and it says nothing about the price.
Sep 28Officer Atay Oguzhan filed to sell $1.0M by Sep 28 (Form 144)
Why it matters
A Form 144 is a notice of intent to sell; the sale may not happen, and it says nothing about the price.

Watch BLLN

A free account keeps a watchlist and can send one email a day when insiders, funds or Congress file on the names in it. No password and no card.

The year, with the filings on it
Total return over 12 months. Each marker is a filing; hover or tap one for the detail.
+2.3%12M
-41%-15%+11%+38%2025-112026-012026-032026-052026-062026-082026-10 2026-08-05 · Atay Oguzhan sold $2.3M2026-09-17 · Lynch Thomas P. sold $2.1M2026-08-03 · Atay Oguzhan sold $1.4M2025-11-07 · Bremner Thomas S bought $1.1M2026-09-28 · Atay Oguzhan sold $1.0M2026-08-25 · Tsao David sold $1.0M2026-09-09 · Tsao David sold $1.0M2026-09-09 · Tsao David sold $975.4K2026-07-09 · Atay Oguzhan sold $939.3K2026-08-10 · Tsao David sold $928.6K2026-08-03 · Atay Oguzhan sold $866.8K2026-08-03 · Atay Oguzhan sold $858.6K2026-09-08 · Lynch Thomas P. sold $829.5K2026-09-17 · Lynch Thomas P. sold $768.6K2026-07-06 · Atay Oguzhan sold $765.9K2026-09-14 · Atay Oguzhan sold $731.8K2026-07-16 · Johnson Nancy JoAnn sold $722.3K2026-07-16 · Johnson Nancy JoAnn sold $710.9K2026-07-06 · Atay Oguzhan sold $650.4K2026-09-17 · Lynch Thomas P. sold $644.1K2026-10-12 · Atay Oguzhan sold $633.3K2026-06-08 · Atay Oguzhan sold $625.0K2026-06-08 · Atay Oguzhan sold $602.8K2026-07-31 · Sakakibara Shan Riku sold $560.8K2026-10-05 · Tsao David sold $533.6K2026-06-08 · Atay Oguzhan sold $518.0K2026-07-09 · Sakakibara Shan Riku sold $500.0K2026-07-13 · Tsao David sold $482.3K2026-10-05 · Tsao David sold $464.4K2026-06-09 · Johnson Nancy JoAnn sold $463.2K2026-09-14 · Atay Oguzhan sold $440.4K2026-06-24 · Sakakibara Shan Riku sold $440.0K2026-07-06 · Atay Oguzhan sold $434.4K2026-08-03 · Atay Oguzhan sold $428.9K2026-08-03 · Atay Oguzhan sold $428.8K2026-06-08 · Atay Oguzhan sold $423.6K2026-09-24 · Tsao David sold $416.6K2025-11-07 · Johnson Nancy JoAnn bought $414.0K2025-11-07 · Bremner Thomas S bought $412.0K2026-07-13 · Tsao David sold $400.8K2026-06-08 · Sakakibara Shan Riku sold $400.0K2026-06-08 · Atay Oguzhan sold $399.0K2026-01-20 · Hummingbird Ventures Management NV filed a 5%+ stake (19.6%)2026-01-20 · Hummingbird Opportunity Fund II CommV filed a 5%+ stake (6.55%)2026-01-20 · Hummingbird Ventures III CommV filed a 5%+ stake (6.43%)2026-01-20 · Hummingbird Dragons CommV filed a 5%+ stake (5.02%)2026-01-20 · Hummingbird Collective CommV filed a 5%+ stake (0.05%)2026-01-20 · HB&Q NV filed a 5%+ stake (1.6%)2026-01-20 · Firat Ileri filed a 5%+ stake (19.6%)2026-01-20 · Barend Van den Brande filed a 5%+ stake (19.6%)2026-01-20 · Lukas Decoster filed a 5%+ stake (19.6%)2026-10-15 · Atay Oguzhan filed to sell $516.2K2026-10-14 · Atay Oguzhan filed to sell $261.4K2026-10-14 · Atay Oguzhan filed to sell $313.0K2026-10-13 · Atay Oguzhan filed to sell $1.6M2026-10-13 · Atay Oguzhan filed to sell $260.3K2026-10-05 · Tsao David filed to sell $184.0K2026-10-05 · ten Bosch John Roderick filed to sell $298.0K2026-10-05 · Tsao David filed to sell $2.2M2026-09-28 · Atay Oguzhan filed to sell $1.0M2026-09-28 · Atay Oguzhan filed to sell $321.6K2026-09-24 · ten Bosch John Roderick filed to sell $169.9K2026-09-24 · Tsao David filed to sell $416.6K2026-09-21 · ten Bosch John Roderick filed to sell $151.0K2026-09-17 · Lynch Thomas P. filed to sell $3.9M2026-09-14 · Atay Oguzhan filed to sell $522.5K2026-09-14 · Atay Oguzhan filed to sell $2.5M2026-09-09 · ten Bosch John Roderick filed to sell $138.1K2026-09-09 · Tsao David filed to sell $2.0M2026-09-09 · Tsao David filed to sell $170.7K2026-09-08 · Lynch Thomas P. filed to sell $2.0M
Insider buyInsider sell13D/G stakeForm 144 (planned sale)
Indexed to 100, dividend-adjusted, not a price chart. When a name files heavily, the largest trades are drawn first.

Who owns BLLN: institutional holders (13F)

13F holdings, latest reported quarter
ADAMS STREET PARTNERS LLC
1,711,430 sh
$205.3M
BAILLIE GIFFORD & CO
901,420 sh
$108.2M
VANGUARD PORTFOLIO MANAGEMENT LLC
840,970 sh
$100.9M
Invesco Ltd.
835,614 sh
$100.3M
VANGUARD CAPITAL MANAGEMENT LLC
799,468 sh
$95.9M

Congress trades in BLLN

No Congress trades reported
No House member has disclosed a trade in this stock. See what Congress is buying.

Activist and 5% holders (13D/13G)

13D: intends to influence · 13G: passive
Hummingbird Ventures Management NV
Activist 13D · 2026-01-20
19.6%
Hummingbird Opportunity Fund II CommV
Activist 13D · 2026-01-20
6.55%
Hummingbird Ventures III CommV
Activist 13D · 2026-01-20
6.43%
Hummingbird Dragons CommV
Activist 13D · 2026-01-20
5.02%
Hummingbird Collective CommV
Activist 13D · 2026-01-20
0.05%

BLLN planned insider sales (Form 144)

Notice of intent to sell, filed before any sale
Atay Oguzhan
Filed 2026-10-15
$516.2K
Atay Oguzhan
Filed 2026-10-14
$261.4K
Atay Oguzhan
Filed 2026-10-14
$313.0K
Atay Oguzhan
Filed 2026-10-13
$1.6M
Atay Oguzhan
Filed 2026-10-13
$260.3K

BLLN mutual fund holders (N-PORT)

Funds ranked by the share of their own portfolio in this stock (N-PORT).
Baron Health Care Fund
$3.2M position · as of 2026-06-30
2.8%
F/m Emerald Life Sciences Innovation ETF
$2.9M position · as of 2026-05-31
2.7%
ALGER SMALL CAP FOCUS FUND
$20.0M position · as of 2026-07-31
2.3%
Wasatch Ultra Growth Fund
$10.6M position · as of 2026-06-30
2.3%
Wasatch Small Cap Growth Fund
$24.5M position · as of 2026-06-30
2.1%
BARON DISCOVERY FUND
$34.4M position · as of 2026-06-30
1.9%
SEC N-PORT, monthly, about 60 days late · funds ≥ $10M · % is the share of the fund's own portfolio
Live price
Daily candles from TradingView, under their licence. No filings marked.
Why this name is on the desk
Insiders have filed to sell, before selling.
The record shows a net $48.2M sold by insiders over 180 days, 128 funds added last quarter, $30.8M in planned Form 144 sales. Each figure is a federal filing, dated the day it went public.
Backtest this pattern Open the screener
Same sector, ranked by filing activity
Sector by SEC SIC code
NTRACSTLPGNYHIMSWGSPRVATDOCAVAHGHADUSSERABDSX

BLLN financials

Revenue growth
+100.0%
XBRL, annual
Net margin
2.4%
Ratios from the company's XBRL filings, latest filings
Revenue, TTM
$397.4M
four quarters, 2025-07-01 to 2026-06-30
Net margin, TTM
+9.5%
net income over revenue, 2025-07-01 to 2026-06-30
Free cash flow, TTM
$33.2M
operating cash flow minus capex, 2025-07-01 to 2026-06-30
Debt to equity
0.17x
LongTermDebt as filed 2026-06-30 (includes the current portion); equity 2026-06-30
Cash flow to debt
0.50x
TTM operating cash flow over LongTermDebt as filed 2026-06-30 (includes the current portion)
Return on equity
+26.3%
TTM net income over average of 2025-06-30 and 2026-06-30
Return on assets
+5.2%
TTM net income over ending balance 2026-06-30
Return on invested capital
n/a
invested capital is zero or negative
Return on capital employed
+6.4%
operating income (EBIT proxy) over ending balance 2026-06-30 minus current liabilities
P/E, trailing
159.24x
close 2026-10-26 over four quarters of diluted EPS, 2025-07-01 to 2026-06-30
Enterprise value
n/a
no share count filed
FCF yield
n/a
no share count filed
PEG, trailing
n/a
prior-year trailing EPS was a loss, growth undefined
Price as of 2026-10-26. Hover or tap a tile for its yearly and quarterly history.
Method
TTM is four consecutive fiscal quarters; Q4 is the year minus nine months when not filed. Returns use the average of opening and closing balances. EBIT is approximated by operating income. PEG uses trailing EPS growth.
Fundamentals
Annual figures from XBRL filings. Pick a past date to see them as known then.
2025-122024-122023-12
Revenue$305.1M$152.6M$71.7M
Gross profit$208.5M$80.9M$17.3M
Operating income$16.0M-$47.1M-$69.5M
Net income$7.5M-$41.6M-$82.7M
EPS (diluted)0.14-4.12-8.45
Operating cash flow$24.6M-$41.4M-$53.7M
Cash$496.0M$191.5Mn/a
Long-term debt$57.2M$51.5Mn/a
Buybacks$0$546.0K$0
SEC XBRL, fiscal years, as known on 2026-10-27

BLLN Stock Sonar score 6/7 axes

Find similar shapesCompare

BLLN ranks highest on growth (95th percentile) and profitability (72nd), and lowest on insider conviction (10th), among Healthcare Services peers.

ProfitHealthGrowthInsidersInstitutionsRisk
Profitability
72
Inputs
  • Return on equity+26.3% · 88 pct, sector of 70
  • Return on assets+5.2% · 71 pct, sector of 88
  • Return on invested capitalinvested capital is zero or negative
  • Return on capital employed+6.4% · 57 pct, sector of 68
Financial health
70
Inputs
  • Debt to equity0.17x · 63 pct, sector of 61
  • Cash flow to debt0.50x · 77 pct, sector of 66
Growth
95
Inputs
  • Revenue growth, YoY+100.0% · 95 pct, sector of 87
  • Backlog growth, YoYno backlog line filed, or no year-earlier backlog
Insider conviction
10
Inputs
  • Net Form 4 buying (codes P and S), 180d-$29.0M · 19 pct, sector of 64
  • Insider buyers, 180d0 · 0 pct, sector of 64
Institutional and government
47
Inputs
  • Funds adding, latest quarter128 · 47 pct, sector of 73
  • Congress net buyers, 365dno Congress trades in 365 days
  • Federal contracts, 180dno federal contracts in 180 days
  • Lobbying spend, 4 quartersno lobbying filings in the last four quarters
Risk and compliance
26
Inputs
  • Short interest, % of float+9.8% · 26 pct, sector of 95
  • Recalls per $1B revenue, 3ynot measured for this sector, almost no peer has an event
  • EPA cases per $1B revenue, 5ynot measured for this sector, almost no peer has an event
  • New text in Risk Factors, latest 10-Kneeds two 10-Ks with a Risk Factors section (not 20-F filers or stubs)
1 not measured: US patents
  • US patents needs 1 of 2 inputs, 0 present: patent data not loaded yet

6 of 7 axes scored. Each is a percentile against sector peers (all companies when the sector is thin); higher is better. An unscored axis is unmeasured, not low. How it is scored

BLLN filings, in plain words

Are BillionToOne insiders buying or selling BLLN?

In the 180 days to 2026-10-27, BillionToOne insiders were net sellers, a net $48.2M across purchases and sales reported on Form 4, by 6 sellers.

Are there planned insider sales of BLLN?

Yes. 30 Form 144 notices of planned insider sales were filed in the 90 days to 2026-10-27, covering $30.8M of stock; the latest, by Atay Oguzhan, was filed 2026-10-15.

Read the full summary

In the 180 days to 2026-10-27, BillionToOne insiders were net sellers of BLLN, a net $48.2M across purchases and sales reported on Form 4 by 6 sellers. 37% of the 168 insider sales were made under a Rule 10b5-1 plan; the rest were not flagged as planned. Insiders filed 30 Form 144 notices of intent to sell in the 90 days to 2026-10-27, covering $30.8M of stock. The latest 5% ownership filing is a 13D by Hummingbird Ventures Management NV, filed 2026-01-20, for 19.6% of the class. Each figure is counted from SEC and House filings as of 2026-10-27, dated the day the filing was made public.

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