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  4. [Form 4] ALX ONCOLOGY HOLDINGS INC Insider Trading Activity

ALX Oncology (ALXO) SVP Finance sells shares for taxes

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

ALX Oncology Holdings Inc. (ALXO) reported that officer Shelly Wong, SVP, Finance and CAO, sold 573 shares of Common Stock on 2026-08-17 at $1.93 per share. According to the disclosure, the shares were sold to satisfy tax obligations arising from the vesting of restricted stock units. After this transaction, Wong directly holds 87,828 shares of ALXO common stock.

Positive

  • None.

Negative

  • None.
Insider Wong Shelly
Role SVP, FINANCE AND CAO
Sold 573 shs ($1K)
Type Security Shares Price Value
Sale Common Stock F1 573 $1.93 $1K
Holdings After Transaction: Common Stock — 87,828 shares (Direct)
Footnotes (1)
  1. F1. The reported shares were sold to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units.
Shares sold 573 shares Common Stock sold by Shelly Wong on 2026-08-17
Sale price per share $1.93 per share Price for the 573 ALXO shares sold on 2026-08-17
Shares owned after transaction 87,828 shares Direct ALXO Common Stock holdings by Shelly Wong following the sale
restricted stock units financial
"vesting of restricted stock units"
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.
Common Stock financial
"security_title: "Common Stock""
Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.
tax obligations financial
"sold to satisfy the reporting person's tax obligations"

FAQ

What insider transaction did ALXO report for Shelly Wong?
ALX Oncology (ALXO) reported that Shelly Wong sold 573 shares of Common Stock on 2026-08-17 at $1.93 per share. The filing states the sale was made to satisfy tax obligations related to vesting restricted stock units.

How many ALXO shares does Shelly Wong hold after this Form 4 transaction?
After the reported sale, Shelly Wong directly holds 87,828 ALXO shares. This post-transaction holding reflects her remaining ownership following the sale of 573 shares used to cover tax obligations from vesting restricted stock units.

What was the sale price per share in Shelly Wong’s ALXO stock transaction?
The reported sale price was $1.93 per ALXO share for 573 shares sold on 2026-08-17. The filing classifies this as a sale of Common Stock, executed to satisfy tax obligations tied to vesting restricted stock units.

Why did Shelly Wong sell ALXO shares according to the Form 4 filing?
The Form 4 states the 573 ALXO shares were sold to satisfy the reporting person’s tax obligations from vesting restricted stock units. This indicates the transaction was linked to equity compensation rather than a discretionary open-market portfolio change.

Was Shelly Wong’s ALXO stock sale under a Rule 10b5-1 trading plan?
The Form 4 for ALX Oncology (ALXO) does not indicate a Rule 10b5-1 plan; the relevant checkbox is unchecked. The only footnote explains that the 573-share sale covered tax obligations from vesting restricted stock units.

What type of security did Shelly Wong trade in this ALXO Form 4 filing?
The transaction involved Common Stock of ALX Oncology (ALXO). Shelly Wong sold 573 shares at $1.93 per share to cover tax obligations from vesting restricted stock units, and now directly owns 87,828 shares.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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*
Wong Shelly
(Last)(First)(Middle)
C/O ALX ONCOLOGY HOLDINGS INC.
323 ALLERTON AVENUE
(Street)
SOUTH SAN FRANCISCO CALIFORNIA 94080
(City)(State)(Zip)
UNITED STATES
(Country)		2. Issuer Name and Ticker or Trading Symbol
ALX ONCOLOGY HOLDINGS INC [ ALXO ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
SVP, FINANCE AND CAO
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/17/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock08/17/2026S(1)573D$1.9387,828D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. The reported shares were sold to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units.
/s/ Shelly Wong08/18/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR