OSTX

On January 22, 2026, the reporting person was granted options to purchase 50,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as a director of the issuer on such date.

On January 22, 2026, the reporting person was granted options to purchase 50,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as a director of the issuer on such date.

On January 22, 2026, the reporting person was granted options to purchase 50,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as a director of the issuer on such date.

On January 22, 2026, the reporting person was granted options to purchase 100,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as an employee of the issuer on such date.

On January 22, 2026, the reporting person was granted options to purchase 50,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as a director of the issuer on such date.

On January 22, 2026, the reporting person was granted options to purchase 100,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as an employee of the issuer on such date.

On January 22, 2026, the reporting person was granted options to purchase 1,000,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as an employee of the issuer on such date.

On January 22, 2026, the reporting person was granted options to purchase 50,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as a director of the issuer on such date.

On October 21, 2025, the reporting person was granted options to purchase 140,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as a director of the issuer on such date.

On October 21, 2025, the reporting person was granted options to purchase 140,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as a director of the issuer on such date.

On October 21, 2025, the reporting person was granted options to purchase 140,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as a director of the issuer on such date.

On October 21, 2025, the reporting person was granted options to purchase 200,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as an employee of the issuer on such date.

On October 21, 2025, the reporting person was granted options to purchase 140,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as a director of the issuer on such date.

On October 21, 2025, the reporting person was granted options to purchase 140,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as a director of the issuer on such date.

On October 21, 2025, the reporting person was granted options to purchase 500,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as an employee of the issuer on such date.

On October 21, 2025, the reporting person was granted options to purchase 1,000,000 shares of the issuer's common stock pursuant to the terms and conditions of a stock option award agreement. These options vest in full on the one-year anniversary of the date of grant, provided that the reporting person is serving as an employee of the issuer on such date.

The price reported in Column 4 is a weighted average price. These shares of Comm Stock were sold in multiple transactions at prices ranging from $1.69 to $2.22 per share, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $1.33 to $1.42 per share, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

Pursuant to a Transfer Agreement, effective as of May 13, 2024 (the "Transfer Agreement"), between Einodmil LLC ("Einodmil") and the reporting person, 600,000 shares of the issuer's common stock owned by the reporting person were placed in escrow in exchange for Einodmil's participation in a pre-IPO lock-up agreement. The Transfer Agreement, entered into in connection with the issuer's initial public offering, outlined conditions for distributing the 600,000 shares after expiration of the lock-up period, based on the 20-day VWAP of the issuer's common stock. On February 28, 2025, 225,000 of these shares were released from escrow and transferred to the reporting person. The remaining 375,000 shares were released from escrow and transferred to Einodmil.

Forfeiture of shares of Common Stock that were held in escrow pursuant to a Transfer Agreement that Einodmil entered into on May 13, 2024. The shares of Common Stock were forfeited pursuant to the terms and conditions of the Transfer Agreement.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $2.67 to $3.036 per share, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The price reported in Column 4 is a weighted average price. These shares of Comm Stock were sold in multiple transactions at prices ranging from $6.618 to $6.80 per share, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $100,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $50,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $350,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

These shares of Common Stock were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering, of a convertible promissory note held by MRP in the principal amount of $50,000 at a conversion price of $2.00 per share.

John Ciccio serves on the board of managers of MRP and shares voting and investment power with respect to these shares.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $170,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $250,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $50,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $150,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

These shares of Common Stock were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering, of a convertible promissory note held by MRP in the principal amount of $75,000 at a conversion price of $0.39 per share.

Theodore F. Search serves on the board of managers of MRP and shares voting and investment power with respect to these shares.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $100,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

These shares of Common Stock were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering, of a convertible promissory note held by MRP in the principal amount of $75,000 at a conversion price of $0.39 per share.

John Ciccio serves on the board of managers of MRP and shares voting and investment power with respect to these shares.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Mr. Auerbach in the principal amount of $25,000 at a conversion price of $1.31 per share.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $350,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $170,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $250,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $1,150,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

These shares of Common Stock were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering, of a convertible promissory note held by Mill River Partners LLC ("MRP") in the principal amount of $25,000 at a conversion price of $0.39 per share.

John Ciccio serves on the board of managers of MRP and shares voting and investment power with respect to these shares.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $150,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $500,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $500,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $100,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Einodmil in the principal amount of $350,000 at a conversion price of $2.00 per share.

The shares of common stock, par value $0.001 per share (the "Common Stock"), of the Issuer are held directly by Einodmil LLC ("Einodmil"). Mr. Auerbach serves as the Principal of Einodmil and exercises voting and dispositive power over the shares held by Einodmil. Mr. Auerbach disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein.

These shares of Common Stock were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering, of a convertible promissory note held by Mill River Partners LLC ("MRP") in the principal amount of $25,000 at a conversion price of $0.39 per share.

Theodore F. Search serves on the board of managers of MRP and shares voting and investment power with respect to these shares.

These shares of Common Stock were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering, of a convertible promissory note held by MRP in the principal amount of $50,000 at a conversion price of $2.00 per share.

Theodore F. Search serves on the board of managers of MRP and shares voting and investment power with respect to these shares.

The shares of Common Stock of the Issuer were issued upon the automatic conversion, which occurred upon the consummation of the Issuer's initial public offering on August 2, 2024, of a convertible promissory note held by Mr. Auerbach in the principal amount of $25,000 at a conversion price of $1.31 per share.