Every Form 4 that BillionToOne, Inc. (BLLN) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow BLLN and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full BLLN filings page.
BillionToOne, Inc. Chairman and CEO Oguzhan Atay exercised options for 3,183 Class A common shares on October 14, 2026, and 5,150 shares on October 15, at $2.8000 per share. He also reported multiple share sales on both dates, including 3,083 shares sold on October 14 at a weighted average price of $98.3198 per share. His spouse separately sold 2,667 shares at $98.0000 per share that day, with a reported resulting holding of 149,168 shares. Atay’s transactions were made under a Rule 10b5-1 trading plan adopted June 5, 2026; his spouse’s sale was under a separate plan adopted June 7, 2026.
BillionToOne, Inc. (BLLN) Chairman and CEO Oguzhan Atay exercised 16,667 options at $2.80 per share on October 12, 2026, acquiring 16,667 Class A shares. The options were fully vested and exercisable.
The transactions reported sales of 19,334 Class A shares, including five direct sale transactions and 2,667 shares sold by Atay’s spouse. The direct sale rows reported weighted-average prices from $91.5712 to $96.3924 per share; the spouse’s sale had a $97.6100 weighted-average price. Atay’s transactions were under a Rule 10b5-1 plan adopted June 5, 2026; his spouse’s sale was under a separate plan adopted June 7, 2026. The spouse-held position following the sale was reported as 151,835 shares.
BillionToOne, Inc. reported that its General Counsel, Chief Compliance Officer and Secretary, Thomas P. Lynch, exercised 8,000 stock options at an exercise price of $8.65 per share on October 8, 2026, acquiring 8,000 Class A Common Stock shares. After the transactions, he reported options covering 40,974 shares and direct holdings of 8,700 Class A shares.
At BillionToOne, Inc. (BLLN), SVP of Laboratory Operations John Roderick ten Bosch reported two sales of 1,417 Class A common shares each on October 5, 2026, at $105.15 per share. Both transactions were made under a Rule 10b5-1 trading plan adopted on June 2, 2026.
BillionToOne, Inc. (BLLN) Chief Technology Officer David Tsao exercised options to acquire 20,000 shares of Class A common stock at $2.80 per share on October 5, 2026. He sold 20,000 shares that day in 11 transactions. The common-stock acquisitions and sales were reported under a Rule 10b5-1 trading plan adopted June 5, 2026. The options were fully vested and exercisable and expire June 7, 2031.
BillionToOne, Inc. (BLLN) Chairman and CEO Oguzhan Atay exercised 8,333 options at $2.80 per share on September 28, 2026, acquiring 8,333 Class A common shares and selling them at $120.64 per share under a Rule 10b5-1 plan adopted June 5, 2026. His spouse separately sold 2,666 shares at $120.64 per share that day under a plan adopted June 7, 2026; the spouse's reported indirect holdings after the sale were 154,502 shares. Atay's reported option position following the exercise was 493,629 options.
BillionToOne, Inc. (BLLN) Chief Technology Officer and director David Tsao exercised options to acquire 3,333 Class A common shares on September 24, 2026, at an exercise price of $2.80 per share, then sold 3,333 shares at $125 per share. The transactions were made under a Rule 10b5-1 trading plan adopted June 5, 2026. The derivative row reports 556,667 stock options following the exercise; the options were fully vested and exercisable.
BillionToOne, Inc. (BLLN) SVP of Laboratory Operations John Roderick ten Bosch sold 1,416 shares of Class A Common Stock at $120 per share on September 24, 2026. His reported direct holdings after the sale were 22,219 shares. The transaction was made under a Rule 10b5-1 trading plan adopted on June 2, 2026.
BillionToOne, Inc. (BLLN) SVP of Laboratory Operations John Roderick ten Bosch sold 1,416 shares of Class A Common Stock at $106.61 per share on September 21, 2026. He directly held 23,635 shares after the sale. The transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by him on June 2, 2026.
BillionToOne, Inc. (BLLN) insider Thomas P. Lynch, the company’s General Counsel, Chief Compliance Officer and Secretary, reported option exercises and related share sales in Class A Common Stock on September 17, 2026. He exercised stock options covering 35,112 shares at exercise prices from $8.65 to $30.78 per share, receiving the same number of Class A shares. He then sold 35,112 shares of Class A Common Stock in multiple open-market or private transactions at weighted average prices around $110 per share, with sale-price ranges detailed in the footnotes. All transactions were effected pursuant to a Rule 10b5-1 trading plan adopted on June 8, 2026, and the options exercised were fully vested and exercisable.
BillionToOne, Inc. (BLLN) reports that Chairman and CEO Atay Oguzhan exercised stock options covering 24,999 shares of Class A Common Stock at an exercise price of $2.80 per share on September 14, 2026, and that he sold 30,331 shares of Class A Common Stock in multiple transactions that day.
The company states that these sales, including sales of shares held by his spouse, occurred at weighted average prices generally between $98.060 and $101.820 per share, were effected in open-market transactions pursuant to Rule 10b5-1 trading plans adopted on June 5, 2026 and June 7, 2026, and involved fully vested stock options expiring on June 7, 2031.
BillionToOne, Inc. (BLLN) reported that Chief Product Officer Shan Riku Sakakibara made a bona fide gift transfer of 3,500 shares of Class A Common Stock on September 10, 2026. No price was paid for the gift, and Sakakibara now holds 196,500 shares directly. No Rule 10b5-1 trading plan is reported.
BillionToOne, Inc. (BLLN) reported that John Roderick ten Bosch, its SVP of Laboratory Operations, sold 1,416 shares$97.54 per share25,051 shares
The filing states that this transaction was effected pursuant to a Rule 10b5-1 trading plan adopted on June 2, 2026
BillionToOne, Inc. (BLLN) reported that Chief Technology Officer David Tsao exercised options to acquire 20,000 shares of Class A Common Stock at an exercise price of $2.80 per share on September 9, 2026, and sold 20,000 shares the same day in two transactions at $97.54 and $100.00 per share. These transactions were carried out under a Rule 10b5-1 trading plan adopted on June 5, 2026, and the options exercised were fully vested and exercisable.
BillionToOne, Inc. insider Thomas P. Lynch, the General Counsel, Chief Compliance Officer and Secretary, reported option exercises and related share sales on September 8, 2026. He exercised options covering 20,000 shares of Class A Common Stock at exercise prices of $8.65, $11.55, $17.12 and $30.78 per share, all from previously disclosed, fully vested grants.
On the same date, he sold a total of 20,000 shares of Class A Common Stock in a series of open-market transactions at prices generally around $96–$101 per share, with several reported as weighted-average prices over stated intraday ranges. All transactions were made under a Rule 10b5-1 trading plan adopted on June 8, 2026.
BillionToOne, Inc. (BLLN) reports equity movements by Chairman and CEO Atay Oguzhan involving 20,000 shares. On September 8, 2026, 20,000 shares of Class B common stock were converted into 20,000 shares of Class A common stock at a 1:1 ratio, leaving 2,197,542 Class B shares held directly. On September 9, 2026, Oguzhan made a bona fide gift transfer of 20,000 Class A shares. Class B shares are convertible into Class A shares at the holder’s option and will automatically convert one-for-one upon specified future events.
BillionToOne, Inc. (BLLN) director and Chief Technology Officer David Tsao reported a series of internal equity moves. On September 3, 2026, he converted 20,000 shares of Class B common stock into 20,000 shares of Class A common stock at a 1:1 ratio, leaving 2,305,108 Class B shares held directly. On September 8, 2026, he made a bona fide gift of 20,000 Class A shares at a reported price of $0.00 per share. Class B shares are convertible into Class A on a one-for-one basis at the holder’s option and will automatically convert on specified future events. No Rule 10b5-1 trading plan is reported for these transactions.
BillionToOne, Inc. (BLLN) director Krishna Kittu Kolluri reported a series of code J “other acquisition or disposition” transactions on August 26, 2026 involving a total of 562,686 shares of Class A Common Stock held indirectly through investment funds, SPVs and trusts. The transactions reflect pro-rata, in-kind distributions among Neotribe-managed entities and various Kolluri-related trusts, all for no additional consideration, rather than open-market trading. Across these restructuring movements, aggregate net shares were neutral, and Kolluri disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest.
BillionToOne, Inc. (BLLN) director and Chief Technology Officer David Tsao reported an option exercise and related share sale. On 2026-08-25, he exercised 10,000 stock options for Class A Common Stock at $2.80 per share, receiving 10,000 shares, and on the same date sold 10,000 shares at $100.00 per share. Following the exercise, he held 580,000 stock options for Class A Common Stock. These transactions were effected pursuant to a Rule 10b5-1 trading plan adopted on March 6, 2026, and the options exercised were fully vested and exercisable.
BillionToOne, Inc. (BLLN) insider ten Bosch John Roderick, SVP of Laboratory Operations, reported selling 1,417 shares of Class A Common Stock on August 25, 2026 at $100.00 per share in an open market or private transaction. Following this sale, he directly holds 26,467 shares. The sale was effected under a Rule 10b5-1 trading plan adopted on March 6, 2026.
BillionToOne, Inc. senior vice president of laboratory operations John Roderick ten Bosch reported selling 1,417 shares of Class A Common Stock on August 10, 2026 at $92.86 per share. After this sale, he held 27,884 shares directly. The sale was executed pursuant to a Rule 10b5-1 trading plan adopted on March 6, 2026.
BillionToOne, Inc. director and Chief Technology Officer David Tsao exercised stock options for 10,000 shares of Class A Common Stock at $2.80 per share on August 10, 2026, then sold 10,000 shares of Class A Common Stock at $92.86 per share. Following the option exercise, he held 590,000 stock options that are fully vested and exercisable, expiring June 7, 2031. The transactions were effected pursuant to a Rule 10b5-1 trading plan adopted on March 6, 2026.
BillionToOne, Inc. Chairman and CEO Atay Oguzhan exercised stock options to acquire 15,539 shares of Class A Common Stock at $2.80 per share, then sold 15,539 shares at a weighted average of $150.0323 per share. The options were fully vested and exercisable, leaving 526,961 stock options outstanding. All reported transactions were effected under a Rule 10b5-1 trading plan adopted on March 6, 2026.
BillionToOne, Inc. Chairman and CEO Atay Oguzhan reported multiple equity transactions in Class A Common Stock. On August 3, 2026 he exercised stock options to acquire 32,500 shares at $2.80 per share from fully vested awards expiring 2031-06-07, and reported sales totaling 45,000 shares in numerous trades at weighted average prices between $132.500 and $139.500 per share, including shares held by his spouse. All transactions were effected under a Rule 10b5-1 trading plan adopted March 6, 2026.
BillionToOne, Inc. Chief Product Officer Sakakibara Shan Riku sold 4,000 shares of Class A Common Stock on July 31, 2026 at $140.21 per share. Following this open-market sale, the executive directly holds 200,000 shares, with the transaction effected under a Rule 10b5-1 trading plan adopted March 6, 2026.
BillionToOne, Inc. executive Nancy JoAnn Johnson, Senior Vice President of Sales and Commercial Operations, reported selling an aggregate 14,199 shares of Class A Common Stock on July 16, 2026. The four open-market or private transactions, executed under a Rule 10b5-1 trading plan adopted on March 6, 2026, were completed at weighted average prices between approximately $126.330 and $130.010 per share.
BillionToOne, Inc. executive ten Bosch John Roderick, SVP of Laboratory Operations, executed pre-arranged open-market sales of 4,251 shares of Class A Common Stock at $125.4600 per share on July 13, 2026, under a Rule 10b5-1 trading plan adopted on March 6, 2026.
BillionToOne, Inc. Chief Technology Officer and director David Tsao reported multiple open-market sales of Class A Common Stock on July 13, 2026, totaling 20,000 shares at weighted-average prices, with underlying trade ranges from $122.185 to $127.2981 per share as detailed in footnotes. He also exercised stock options for 20,000 shares at a $2.8000 exercise price from fully vested options, pursuant to a Rule 10b5-1 trading plan adopted on March 6, 2026.
BillionToOne, Inc. Chairman and CEO Atay Oguzhan exercised options to acquire 12,500 shares of Class A Common Stock at $2.80 per share and on the same date executed open-market sales of 12,500 shares in multiple transactions at weighted average prices between $125.00 and $128.295 per share. Following these trades, he held no shares of Class A Common Stock directly but continued to hold 575,000 stock options. The transactions were carried out under a Rule 10b5-1 trading plan, and the options are reported as fully vested and exercisable.
BillionToOne, Inc. Chief Product Officer Shan Riku Sakakibara reported open‑market sales of Class A Common Stock totaling 8,000 shares at $125.00 per share on July 9, 2026. On the same date, Sakakibara exercised stock options for 4,000 shares of Class A Common Stock at exercise prices of $30.78 and $8.65 per share. The company notes these trades were effected under a Rule 10b5‑1 trading plan and that the options exercised were fully vested and exercisable.
BillionToOne, Inc. Chairman and CEO Atay Oguzhan reported a mix of open-market sales and option exercises involving the company’s Class A Common Stock. The Form 4 shows Rule 10b5-1 plan sales totaling 38,750 shares, including shares held indirectly through his spouse, at weighted average prices generally between about $118 and $125 per share.
On the same date, Oguzhan also exercised stock options to acquire 26,250 shares of Class A Common Stock at an exercise price of $2.80 per share, converting derivative awards into direct share ownership while continuing to hold a remaining common stock position as reflected in the filing’s post-transaction share balances.
BillionToOne, Inc. officer Nancy JoAnn Johnson reported an open-market sale of 801 shares of Class A Common Stock at a weighted average price of $124.9137 per share. The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on March 6, 2026, indicating it was scheduled in advance. Following this transaction, she directly holds 21,099 shares, so the sale represents a small portion of her reported stake.
BillionToOne, Inc. senior vice president of laboratory operations John Roderick ten Bosch reported an open-market sale of 1,416 shares of Class A Common Stock at $120.00 per share. The transaction occurred on June 29, 2026 under a pre-arranged Rule 10b5-1 trading plan adopted on March 6, 2026, and he continues to hold 33,552 shares directly after the sale.
BillionToOne, Inc. Chief Product Officer Sakakibara Shan Riku reported a mix of stock sales and an option exercise in Class A Common Stock. The insider sold a total of 8,000 shares in open-market transactions at $110.00 per share.
On the same date, the insider also exercised stock options to acquire 4,000 shares of Class A Common Stock at an exercise price of $8.65 per share. The filing notes these transactions were carried out under a pre-arranged Rule 10b5-1 trading plan, indicating they were scheduled in advance rather than timed discretionarily.
BillionToOne, Inc. officer ten Bosch John Roderick reported selling a total of 2,832 shares of Class A Common Stock in open-market transactions. The sales were executed at a price of $101.47 per share on June 15, 2026. Following these transactions, the filing shows direct holdings of 34,968 shares after one sale and 36,384 shares after another. According to a footnote, the trades were made under a pre-arranged Rule 10b5-1 trading plan adopted on March 6, 2026, indicating they were scheduled in advance rather than timed discretionarily.
BillionToOne, Inc. director and Chief Technology Officer David Tsao reported a mix of stock sales and option exercises in Class A Common Stock. He completed open-market sales totaling 20,000 shares on June 15, 2026 at weighted average prices generally around $100–$104 per share, in multiple tranches.
On the same date, he exercised stock options to acquire 20,000 shares at an exercise price of $2.80 per share. After these transactions, Tsao directly holds 19,296 shares of Class A Common Stock and 630,000 stock options with a $2.80 exercise price expiring on June 7, 2031. The filing states the transactions were carried out under a pre-arranged Rule 10b5-1 trading plan adopted on March 6, 2026.
BillionToOne, Inc. director Thomas S. Bremner reported an equity award on a Form 4. He acquired 3,017 shares of Class A common stock on a grant/award basis at a price of $0.00 per share, bringing his directly held position to 11,350 shares after the transaction.
According to the footnote, the award consists of restricted stock units (RSUs), each representing a contingent right to receive one share of Class A common stock. These RSUs are subject to a service-based vesting requirement, which will be satisfied on the earlier of the date of the next annual meeting of stockholders or the one-year anniversary of June 10, 2026.
KOLLURI KRISHNA KITTU reported acquisition or exercise transactions in this Form 4 filing.
BillionToOne, Inc. director and 10% owner Krishna Kittu Kolluri received a grant of 3,017 shares of Class A common stock in the form of restricted stock units at no cash cost. Following this award, he holds 11,350 shares directly, subject to service-based vesting tied to the next annual stockholder meeting or the one-year anniversary of June 10, 2026.
Ileri Firat reported acquisition or exercise transactions in this Form 4 filing.
BillionToOne director and major shareholder Ileri Firat received an equity award in the form of restricted stock units (RSUs). The grant covers 3,017 RSUs of Class A common stock at no cash cost, increasing Firat’s direct holdings to 40,331 shares after the award.
The RSUs carry a service-based vesting condition and will vest on the earlier of the company’s next annual meeting of stockholders or the one-year anniversary of June 10, 2026. This is a compensation-related, non-market transaction rather than an open-market purchase or sale.
Pagano Anthony reported acquisition or exercise transactions in this Form 4 filing.
BillionToOne, Inc. director Anthony Pagano reported receiving a grant of 3,017 restricted stock units (RSUs) of Class A common stock at no cash cost. Each RSU represents one share and is subject to a service-based vesting requirement that is satisfied on the earlier of the next annual stockholder meeting or the one-year anniversary of June 10, 2026. Following this equity award, Pagano holds 7,913 shares of Class A common stock directly.
Rai Akshay reported acquisition or exercise transactions in this Form 4 filing.
BillionToOne, Inc. director Akshay Rai received a grant of 3,017 restricted stock units (RSUs) linked to Class A Common Stock. Each RSU represents a right to receive one share for no cash payment. The RSUs vest when a service-based condition is met, on the earlier of the next annual stockholder meeting or the one-year anniversary of June 10, 2026. Following this equity award, Rai directly holds 14,026 shares of Class A Common Stock.
BillionToOne director Krishna Kittu Kolluri reported a series of restructuring transactions involving indirect holdings of Class A common stock. On 2026-06-09, entities associated with Kolluri completed 16 “J” code transactions classified as other acquisitions or dispositions, covering 481,807 shares in total.
The footnotes explain these were pro-rata, in-kind distributions among multiple Neotribe investment funds, special purpose vehicles, and family trusts, all for no additional consideration and not open-market trades. The securities are held directly by these entities, where Kolluri serves as managing member or trustee, and he disclaims beneficial ownership except to the extent of his pecuniary interest.
Investment entities affiliated with NeoTribe, including NeoTribe Ventures and multiple related funds and LLCs, reported a series of internal restructuring transactions in BillionToOne, Inc. Class A Common Stock. All ten transactions were coded as “J” for other acquisitions or dispositions and totaled 465,607 shares, with a reported price of $0.00 per share, indicating no cash consideration.
Footnotes explain these were pro-rata, in-kind distributions by funds and special purpose vehicles such as Neotribe Ignite Fund I, L.P., Neotribe SPV I BTO, LLC, NeoTribe Ventures I, L.P., NeoTribe Associates I, L.P., and NeoTribe Partners I, LLC to their partners or members. Following these changes, one entity directly holds 2,168,230 shares and another indirectly holds 1,038,239 shares, while smaller indirect holdings of 193,772, 7,980, 5,423 and 1,425 shares are reported, reflecting a reallocation among affiliated investment vehicles rather than open-market trades.
BillionToOne, Inc. Chief Product Officer Sakakibara Shan Riku reported open-market sales of 8,000 shares of Class A Common Stock on June 8, 2026. The transactions were executed in two tranches at prices of $100.00 and $96.45 per share under a pre-arranged Rule 10b5-1 trading plan.
The filing indicates these were routine, pre-planned dispositions, and the executive continues to hold a substantially larger direct equity position after the sales.
BillionToOne, Inc. officer Nancy JoAnn Johnson reported open-market sales of 14,000 shares of Class A Common Stock on June 8–9, 2026. The shares were sold in seven transactions at weighted-average prices generally around $99–$102 per share, under a pre-arranged Rule 10b5-1 trading plan adopted on March 6, 2026.
BillionToOne, Inc. director and officer Atay Oguzhan reported multiple transactions in the company’s Class A and Class B common stock. On June 8, 2026, he acquired a total of 36,250 shares of Class A common stock through option exercises and conversion of Class B shares at prices from $0.00 to $2.80 per share.
That same day, 38,750 shares of Class A common stock were sold in open-market transactions at weighted-average prices ranging from about $94.30 to $100.87, including sales of shares held by his spouse. On June 9, 2026, he made a bona fide gift of 10,000 Class A shares. The transactions were effected under a Rule 10b5-1 trading plan adopted on March 6, 2026.
NeoTribe-affiliated funds and entities, each a 10% owner of BillionToOne, Inc., reported internal restructuring transactions in Class A Common Stock. On May 11, 2026, they executed J-code “other” transactions totaling 465,607 shares, classified as pro-rata, in-kind distributions to partners and members for no additional consideration.
These moves shifted shares among related funds and their investors at a stated price of $0.00 per share, changing how holdings are allocated between direct and indirect ownership but not reflecting open-market purchases or sales of BLLN stock.
BillionToOne director and ten percent owner Krishna Kittu Kolluri reported multiple internal restructuring transactions involving Class A Common Stock of BillionToOne, Inc. All 16 entries use transaction code J, reflecting other acquisitions or dispositions rather than open-market buys or sells.
The footnotes explain that NeoTribe investment funds, special purpose vehicles, and related entities made pro-rata, in-kind distributions of shares to partners, members, assignees, and family trusts for no additional consideration. The reported securities are held indirectly through these entities, and Kolluri generally disclaims beneficial ownership beyond his pecuniary interest.
BillionToOne, Inc. (BLLN) insiders reported a large structural change in their holdings tied to the company’s initial public offering. Investment entities affiliated with Hummingbird funds and HB&Q NV converted multiple series of preferred stock into common stock on a one-for-one basis automatically immediately prior to the closing of BillionToOne’s IPO of Class A common stock, without any cash changing hands.
Immediately before the IPO, each share of common stock was then automatically reclassified into one share of Class A common stock under a Rule 16b-7–exempt reclassification. After these steps, the Hummingbird-affiliated entities reported Class A common stock positions, including 2,631,664 shares and 2,580,833 shares for certain funds. Humming Bird Ventures Management NV may be deemed to beneficially own shares held by the Hummingbird funds, while its partners, including Firat Ileri, Barend Van den Brande, and Lukas Decoster, disclaim beneficial ownership beyond their economic interests.
BillionToOne, Inc. (BLLN) filed a Form 4 reporting equity award activity for its Chief Financial Officer. The filing shows stock options with exercise prices of $11.55 and $30.78 covering 175,000 and 75,000 shares, respectively. These options are listed both before and after a reclassification in connection with the company’s initial public offering of Class A common stock.
The filing explains that, under a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically converted into one share of Class A common stock immediately prior to completion of the IPO. The $11.55 options vest over four years, with 25% vested on January 8, 2025 and the rest in monthly installments over three years. The $30.78 options vest in equal monthly installments over four years starting September 15, 2025, contingent on continued service.