SideChannel (SDCH) CFO receives 35,574 RSUs, now holds 69,704

Rhea-AI Filing Summary

SideChannel, Inc. Chief Financial Officer Ryan Polk reported compensation-related equity activity. On March 16, he received a grant of 35,574 restricted stock units (RSUs) at a reference price of $2.01 per share, which will vest in three equal annual installments each March.

On March 2, 25,745 RSUs vested; 10,602 shares of common stock were withheld to cover taxes, and 15,143 shares of common stock were issued to him, using a reference price of $2.20 per share. After these transactions, he directly beneficially owns 69,704 shares and RSUs in total.

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

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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^*

Polk Ryan

(Last) (First) (Middle)

146 MAIN STREET, SUITE 405

(Street)

WORCESTER, MASSACHUSETTS 01608

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
SideChannel, Inc. [ SDCH ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/02/2026

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								31,229(1)	D
Restricted Stock Unit								59,875(1)	D
Restricted Stock Unit	03/02/2026		F		25,745(2)	D	$2.2(3)	34,130	D
Common Stock								46,372(4)	D
Restricted Stock Unit	03/16/2026		A		35,574(5)	A	$2.01(3)	69,704(4)	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 the total amount of securities beneficially owned by the Reporting Person following the 1 for 52 reverse stock split, effective January 22, 2026.

2. On March 2, 2026, 25,745 RSUs vested, 10,602 shares of common stock otherwise issuable pursuant to the vesting were withheld for the payment of taxes, resulting in the issuance of 15,143 shares of common stock to the Reporting Person.

3. The closing price of the issuer's common stock on the transaction date.

4. Represents the total amount of securities beneficially owned by the Reporting Person following the reported transactions above.

5. Represents a 35,574 RSU award, one third of which shall vest on the first business day of each subsequent March, for the following three years.

	/s/ Ryan L. Polk	03/18/2026
	** 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)

FAQ

What insider transactions did SideChannel (SDCH) report for CFO Ryan Polk?

SideChannel reported that CFO Ryan Polk received a 35,574 RSU grant and had 25,745 RSUs vest. Part of the vested shares were withheld for taxes, with remaining shares issued as common stock.

How many restricted stock units did SideChannel CFO Ryan Polk receive?

Ryan Polk received a new award of 35,574 restricted stock units. According to the disclosure, one third of these RSUs will vest on the first business day of each March over the next three years, subject to continued service.

How were taxes handled on Ryan Polk’s vested RSUs at SideChannel (SDCH)?

When 25,745 RSUs vested on March 2, 10,602 shares of common stock that would have been issued were instead withheld to pay taxes, and 15,143 shares of common stock were delivered to Ryan Polk.

What is Ryan Polk’s total SideChannel beneficial ownership after these Form 4 transactions?

After the reported equity grant and vesting, Ryan Polk beneficially owns 69,704 SideChannel securities in total. This figure includes his direct holdings of common stock and RSUs, as stated in the beneficial ownership footnote.

Were the SideChannel (SDCH) insider transactions open-market buys or sales?

The transactions were compensation-related, not open-market trades. Ryan Polk received an RSU grant and had RSUs vest, with some shares withheld for tax obligations. No open-market purchases or sales were reported in this disclosure.

What prices were used in SideChannel CFO Ryan Polk’s reported equity transactions?

The RSU grant on March 16 used a reference price of $2.01 per share, and the March 2 vesting and tax-withholding event used $2.20 per share, described as the closing price of SideChannel common stock on the respective transaction date.