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buyNotable cluster of 6

Thomas S Bremner bought $2.5M of BLLN

director at BillionToOne, Inc.. 41,666 shares at an average of $60.00, traded Nov 7, 2025, filed Nov 10, 2025.

Conviction score
71
Value
$2.5M
41,666 shares
Holdings after
693,143
+27% from before
From 52-week low
0%
low $100.03, close $100.03
From 52-week high
-8%
high $108.94, as of Nov 7, 2025

Score components

  • Role
    Director
    +15
  • Trade size
    $2.5M at market
    +25
  • Relative to holdings
    Holdings up 27%
    +6
  • Price context
    0% above the 52-week low
    +10
  • Cluster
    6 insiders buying within 14 days
    +15
  • Repeat buying
    First buy in 90 days
    0
  • Track record
    Too few past buys to judge (0 with prices)
    0

What happened after comparable buys

Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.

Price around the trade, and since

From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.

BLLNOct 9, 2026 · close 98.09
Since filing Nov 10, 2025: -4.0%SPY +15.5% · excess -19.5%

Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™

Rows in this filing

Every transaction in Form 4 0001193125-25-274945, as filed. Open on EDGAR

DateTransactionSharesPriceValueHoldings afterFiled
Nov 6, 2025AGrant or award
Common Stock
+8,333$0.00$08,333Nov 10, 2025
Nov 7, 2025CConversion
Common Stockindirect: See Footnotes
+152,440--152,440Nov 10, 2025
Nov 7, 2025CConversion
Common Stockindirect: See Footnotes
+155,711--155,711Nov 10, 2025
Nov 7, 2025CConversion
Common Stockindirect: See Footnotes
+176,271--176,271Nov 10, 2025
Nov 7, 2025CConversion
Common Stockindirect: See Footnotes
+269,918--269,918Nov 10, 2025
Nov 7, 2025CConversion
Common Stockindirect: See Footnotes
+240,072--240,072Nov 10, 2025
Nov 7, 2025CConversion
Common Stockindirect: See Footnotes
+675,352--675,352Nov 10, 2025
Nov 7, 2025CConversion
Common Stockindirect: See Footnotes
+277,508--277,508Nov 10, 2025
Nov 7, 2025JOther
Common Stock
-8,333--0Nov 10, 2025
Nov 7, 2025JOther
Common Stockindirect: See Footnotes
-152,440--0Nov 10, 2025
Nov 7, 2025JOther
Common Stockindirect: See Footnotes
-155,711--0Nov 10, 2025
Nov 7, 2025JOther
Common Stockindirect: See Footnotes
-176,271--0Nov 10, 2025
Nov 7, 2025JOther
Common Stockindirect: See Footnotes
-269,918--0Nov 10, 2025
Nov 7, 2025JOther
Common Stockindirect: See Footnotes
-240,072--0Nov 10, 2025
Nov 7, 2025JOther
Common Stockindirect: See Footnotes
-675,352--0Nov 10, 2025
Nov 7, 2025JOther
Common Stockindirect: See Footnotes
-277,508--0Nov 10, 2025
Nov 7, 2025JOther
Class A Common Stock
+8,333--8,333Nov 10, 2025
Nov 7, 2025JOther
Class A Common Stockindirect: See Footnotes
+152,440--152,440Nov 10, 2025
Nov 7, 2025JOther
Class A Common Stockindirect: See Footnotes
+155,711--155,711Nov 10, 2025
Nov 7, 2025JOther
Class A Common Stockindirect: See Footnotes
+176,271--176,271Nov 10, 2025
Nov 7, 2025JOther
Class A Common Stockindirect: See Footnotes
+269,918--269,918Nov 10, 2025
Nov 7, 2025JOther
Class A Common Stockindirect: See Footnotes
+240,072--240,072Nov 10, 2025
Nov 7, 2025JOther
Class A Common Stockindirect: See Footnotes
+675,352--675,352Nov 10, 2025
Nov 7, 2025JOther
Class A Common Stockindirect: See Footnotes
+277,508--277,508Nov 10, 2025
Nov 7, 2025POpen-market purchase
Class A Common Stockindirect: See Footnotes
+4,016$60.00$241k156,456Nov 10, 2025
Nov 7, 2025POpen-market purchase
Class A Common Stockindirect: See Footnotes
+4,084$60.00$245k159,795Nov 10, 2025
Nov 7, 2025POpen-market purchase
Class A Common Stockindirect: See Footnotes
+3,462$60.00$208k179,733Nov 10, 2025
Nov 7, 2025POpen-market purchase
Class A Common Stockindirect: See Footnotes
+5,446$60.00$327k275,364Nov 10, 2025
Nov 7, 2025POpen-market purchase
Class A Common Stockindirect: See Footnotes
+6,867$60.00$412k246,939Nov 10, 2025
Nov 7, 2025POpen-market purchase
Class A Common Stockindirect: See Footnotes
+17,791$60.00$1.1M693,143Nov 10, 2025
Nov 7, 2025CConversion
Series A-1 Convertible Preferred Stockderivativeindirect: See Footnotes
-1,352--0Nov 10, 2025
Nov 7, 2025CConversion
Series C Convertible Preferred Stockderivativeindirect: See Footnotes
-114,117--0Nov 10, 2025
Nov 7, 2025CConversion
Series C-1 Convertible Preferred Stockderivativeindirect: See Footnotes
-16,747--0Nov 10, 2025
Nov 7, 2025CConversion
Series D Convertible Preferred Stockderivativeindirect: See Footnotes
-20,224--0Nov 10, 2025
Nov 7, 2025CConversion
Series C Convertible Preferred Stockderivativeindirect: See Footnotes
-121,688--0Nov 10, 2025
Nov 7, 2025CConversion
Series C-1 Convertible Preferred Stockderivativeindirect: See Footnotes
-17,858--0Nov 10, 2025
Nov 7, 2025CConversion
Series D Convertible Preferred Stockderivativeindirect: See Footnotes
-16,165--0Nov 10, 2025
Nov 7, 2025CConversion
Series A-1 Convertible Preferred Stockderivativeindirect: See Footnotes
-1,562--0Nov 10, 2025
Nov 7, 2025CConversion
Series C Convertible Preferred Stockderivativeindirect: See Footnotes
-131,888--0Nov 10, 2025
Nov 7, 2025CConversion
Series C-1 Convertible Preferred Stockderivativeindirect: See Footnotes
-19,355--0Nov 10, 2025
Nov 7, 2025CConversion
Series D Convertible Preferred Stockderivativeindirect: See Footnotes
-23,466--0Nov 10, 2025
Nov 7, 2025CConversion
Series A-1 Convertible Preferred Stockderivativeindirect: See Footnotes
-1,864--0Nov 10, 2025
Nov 7, 2025CConversion
Series C Convertible Preferred Stockderivativeindirect: See Footnotes
-157,404--0Nov 10, 2025
Nov 7, 2025CConversion
Series C-1 Convertible Preferred Stockderivativeindirect: See Footnotes
-23,100--0Nov 10, 2025
Nov 7, 2025CConversion
Series D Convertible Preferred Stockderivativeindirect: See Footnotes
-87,550--0Nov 10, 2025
Nov 7, 2025CConversion
Series A-1 Convertible Preferred Stockderivativeindirect: See Footnotes
-652--0Nov 10, 2025
Nov 7, 2025CConversion
Series C Convertible Preferred Stockderivativeindirect: See Footnotes
-55,091--0Nov 10, 2025
Nov 7, 2025CConversion
Series C-1 Convertible Preferred Stockderivativeindirect: See Footnotes
-8,084--0Nov 10, 2025
Nov 7, 2025CConversion
Series D Convertible Preferred Stockderivativeindirect: See Footnotes
-176,245--0Nov 10, 2025
Nov 7, 2025CConversion
Series A-1 Convertible Preferred Stockderivativeindirect: See Footnotes
-5,988--0Nov 10, 2025
Nov 7, 2025CConversion
Series C Convertible Preferred Stockderivativeindirect: See Footnotes
-505,570--0Nov 10, 2025
Nov 7, 2025CConversion
Series C-1 Convertible Preferred Stockderivativeindirect: See Footnotes
-74,195--0Nov 10, 2025
Nov 7, 2025CConversion
Series D Convertible Preferred Stockderivativeindirect: See Footnotes
-89,599--0Nov 10, 2025
Nov 7, 2025CConversion
Series A-1 Convertible Preferred Stockderivativeindirect: See Footnotes
-1,078--0Nov 10, 2025
Nov 7, 2025CConversion
Series C Convertible Preferred Stockderivativeindirect: See Footnotes
-91,003--0Nov 10, 2025
Nov 7, 2025CConversion
Series C-1 Convertible Preferred Stockderivativeindirect: See Footnotes
-13,355--0Nov 10, 2025
Nov 7, 2025CConversion
Series D Convertible Preferred Stockderivativeindirect: See Footnotes
-122,072--0Nov 10, 2025

Related signals

Other insiders at BillionToOne, Inc. and this insider’s other filings.

ScoreCompanyInsiderValueHoldingsFiled
29Weak
BLLNsell 310b5-1
BillionToOne, Inc.
John Roderick ten Bosch
SVP of Laboratory Operations
$298k
2,834 shares
-13%
40Moderate
BLLNsell 310b5-1
BillionToOne, Inc.
David Tsao
Chief Technology Officer
$2.2M
20,000 shares
-95%
50Moderate
BLLNsell 410b5-1
BillionToOne, Inc.
Oguzhan Atay
Chairman and CEO
$1.3M
10,999 shares
-132%
21Weak
BLLNsell 410b5-1
BillionToOne, Inc.
John Roderick ten Bosch
SVP of Laboratory Operations
$170k
1,416 shares
-6%
31Weak
BLLNsell 410b5-1
BillionToOne, Inc.
David Tsao
Chief Technology Officer
$417k
3,333 shares
-77%
21Weak
BLLNsell 410b5-1
BillionToOne, Inc.
John Roderick ten Bosch
SVP of Laboratory Operations
$151k
1,416 shares
-6%
40Moderate
BLLNsell 410b5-1
BillionToOne, Inc.
Thomas P. Lynch
See Remarks
$3.9M
35,112 shares
-98%
50Moderate
BLLNsell 410b5-1
BillionToOne, Inc.
Oguzhan Atay
Chairman and CEO
$3.0M
30,331 shares
-121%
21Weak
BLLNsell 410b5-1
BillionToOne, Inc.
John Roderick ten Bosch
SVP of Laboratory Operations
$138k
1,416 shares
-5%
40Moderate
BLLNsell 410b5-1
BillionToOne, Inc.
David Tsao
Chief Technology Officer
$2.0M
20,000 shares
-95%

Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.

Thomas S Bremner bought $2.5M of BLLN | InsiderTell