[Form 4] Backblaze, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Backblaze, Inc. (BLZE) insider filing: Tina Cessna, Senior Vice President, Engineering, reported a transaction dated 08/20/2025 in which 6,428 shares of Class A common stock were withheld by the issuer to satisfy tax withholding on vested Restricted Stock Units (RSUs). The shares were withheld, not sold, at a reported per-share value of $7.65. After the withholding, the reporting person beneficially owned 184,776 shares. The Form 4 was signed on behalf of the reporting person by an attorney-in-fact, Thomas MacMitchell, on 08/22/2025. The filing contains an explanation that no shares were sold to cover the tax obligation.

Positive

• No open-market sale — shares were withheld by the issuer to cover taxes rather than sold by the reporting person, avoiding immediate market selling pressure
• Clear disclosure — Form 4 specifies the withholding was for RSU tax obligations and includes an explanation and attorney-in-fact signature

Negative

• Reduction in beneficial ownership — the reporting person’s direct holdings decreased by 6,428 shares due to the withholding
• Potential dilution context missing — the filing does not state total outstanding shares, so the proportional impact of the withholding on ownership percentage cannot be determined from this document alone

Insights

Financial Analyst

TL;DR: Routine RSU tax-withholding reduced holdings by 6,428 shares; no open-market sale, so limited market impact.

The reported transaction is a common administrative event tied to RSU vesting where the issuer withheld shares to cover tax obligations. The per-share amount listed ($7.65) reflects the value used for withholding purposes on 08/20/2025 but is not an open-market sale price. For investors, this is non-operational and typically immaterial to company fundamentals, as it does not change outstanding share count or indicate insider cashing out. The remaining beneficial ownership (184,776 shares) shows continued insider alignment with equity exposure.

Corporate Governance Expert

TL;DR: Administrative withholding following RSU vesting; documentation and signature by attorney-in-fact are standard.

The Form 4 disclosure adequately describes the nature of the transaction: shares were withheld by the issuer to satisfy tax-withholding obligations related to RSU vesting and no shares were sold by the reporting person. The filing includes an attorney-in-fact signature dated 08/22/2025, which is a common execution method. This disclosure meets Section 16 reporting requirements and does not raise governance red flags.

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
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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^*

Cessna Tina

(Last) (First) (Middle)

201 BALDWIN AVE.

(Street)

SAN MATEO CA 94401

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Backblaze, Inc. [ BLZE ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Senior VP, Engineering

3. Date of Earliest Transaction (Month/Day/Year)
08/20/2025

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

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

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

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
Class A Common Stock	08/20/2025		F(1)		6,428	D	$7.65	184,776	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. The shares of Class A Common Stock were withheld by the Issuer to cover tax withholding obligations in connection with the vesting of Restricted Stock Units ("RSUs"). No shares were sold by the Reporting Person to satisfy this tax liability.

Remarks:

	/s/ Thomas MacMitchell - Attorney-in-Fact	08/22/2025
	** 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.

FAQ

What transaction did Tina Cessna report on Form 4 for Backblaze (BLZE)?

The Form 4 reports that 6,428 Class A shares were withheld by the issuer on 08/20/2025 to satisfy tax-withholding obligations on vested RSUs.

Were the withheld shares sold in the open market?

No. The filing explicitly states the shares were withheld by the issuer to cover taxes and that no shares were sold by the reporting person.

How many Backblaze shares did the reporting person own after the withholding?

After the withholding, the reporting person beneficially owned 184,776 shares of Class A common stock.

What price is shown on the Form 4 for the withheld shares?

The Form 4 lists a value of $7.65 per share associated with the withheld shares.

Who signed the Form 4 and when?

The Form 4 was signed by Thomas MacMitchell as attorney-in-fact on 08/22/2025.