[Form 4] SAB Biotherapeutics, Inc. Insider Trading Activity

Rhea-AI Filing Summary

SAB Biotherapeutics, Inc. chief medical officer Alexandra Kropotova reported a Form 4 showing a tax-withholding disposition of 988 shares of common stock. These shares were withheld to cover taxes on the vesting of restricted stock units. After this event, she holds 42,308 shares, including 5,150 unvested RSUs.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Kropotova Alexandra

Role CHIEF MEDICAL OFFICER

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	988	$0.00	--

Holdings After Transaction: Common Stock — 42,308 shares (Direct, null)

Footnotes (1)

1. Represents shares of the Issuer's common stock ("Common Stock") withheld to statisfy tax withholding requirements on the vesting of the Issuer's restricked stock units ("RSUs"). Includes 37,158 shares of Common Stock and 5,150 shares of Common Stock which remain subject to vesting of RSUs granted under the Issuer's 2021 Equity Incentive Plan, as amended. Each RSU represents a contingent right to receive one share of Common Stock.

Key Figures

Tax-withholding shares: 988 shares Shares after transaction: 42,308 shares Vested common stock: 37,158 shares +1 more

4 metrics

Tax-withholding shares 988 shares Common stock withheld to satisfy tax obligations on RSU vesting

Shares after transaction 42,308 shares Total common stock held by CMO following tax-withholding disposition

Vested common stock 37,158 shares Portion of holdings not subject to further RSU vesting conditions

Unvested RSU shares 5,150 shares Common stock remaining subject to RSU vesting under 2021 Equity Incentive Plan

Key Terms

restricted stock units, tax withholding requirements, 2021 Equity Incentive Plan, contingent right

4 terms

restricted stock units financial

"withheld to statisfy tax withholding requirements on the vesting of the Issuer's restricked stock units ("RSUs")."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding requirements financial

"withheld to statisfy tax withholding requirements on the vesting of the Issuer's restricked stock units"

2021 Equity Incentive Plan financial

"RSUs granted under the Issuer's 2021 Equity Incentive Plan, as amended."

contingent right financial

"Each RSU represents a contingent right to receive one share of Common Stock."

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/26/2026 - 05:20 PM Accepted by SEC EDGAR 06/26/2026 - 05:20 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Kropotova Alexandra

(Last) (First) (Middle)

777 W 41ST STREET, SUITE 401

(Street)

MIAMI BEACH FLORIDA 33140

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
SAB Biotherapeutics, Inc. [ SABS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CHIEF MEDICAL OFFICER

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/25/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	06/25/2026		F		988(1)	D	(1)	42,308(2)(3)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents shares of the Issuer's common stock ("Common Stock") withheld to statisfy tax withholding requirements on the vesting of the Issuer's restricked stock units ("RSUs").

2. Includes 37,158 shares of Common Stock and 5,150 shares of Common Stock which remain subject to vesting of RSUs granted under the Issuer's 2021 Equity Incentive Plan, as amended.

3. Each RSU represents a contingent right to receive one share of Common Stock.

	/s/ Alexandra Kropotova	06/26/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)