Company: REVB
Filing Date: 2025-05-23
Form Type: S-1/A
Source: 0001213900-25-047104
Chunk: 210

Company: REVELATION BIOSCIENCES, INC.
Filing Date: 2025-05-23
Form: S-1/A
Chunk 210
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atility              |     |   47 | % |
| Expected term (years)   |     |    5 |   |
| Risk-free interest rate |     | 1.54 | % |
| Expected dividend yield |     |  0.0 | % |

Class B Common Stock Warrants

In connection with closing
of a public offering on July 28, 2022 (“the July 2022 Public Offering”), the Company issued and has outstanding
warrants to purchase an aggregate of shares of common stock at an exercise price of $ per share (the
“Class B Common Stock Warrants”), valued on the public offering purchase date in the aggregate at $ million and
included in the issuance costs of the public offering and treated as equity. The warrants were exercisable immediately upon issuance,
provide for a cash or cashless exercise right and expire on .

The fair value of the Class B
Common Stock Warrants were estimated using the Black-Scholes option pricing model with the following assumptions:

| Volatility              |     |  144 | % |
| Expected term (years)   |     |    5 |   |
| Risk-free interest rate |     | 2.69 | % |
| Expected dividend yield |     |  0.0 | % |

F-21 REVELATION BIOSCIENCES, INC.
Notes to the Consolidated Financial Statements 10. Warrants(cont.)

Class B Placement Agent Common Stock Warrants

In connection with the July 2022
Public Offering, the Company issued warrants to the Placement Agent to purchase up to shares of common stock at an exercise price of
$ per share (the “Class B Placement Agent Common Stock Warrants”), valued on the public offering purchase date
in the aggregate at $ million and included in the issuance costs of the public offering and treated as equity. The warrants were
exercisable immediately upon issuance, provide for a cash or cashless exercise right and expire on .

The fair value of the Class B
Placement Agent Common Stock Warrants were estimated using the Black-Scholes option pricing model with the following assumptions:

| Volatility              |     |  144 | % |
| Expected term (years)   |     |    5 |   |
| Risk-free interest rate |     | 2.69 | % |
| Expected dividend yield |     |  0.0 | % |

Class C Pre-Funded Warrants

In connection with the February 2023
Public Offering, the