ARTV Rule 144 notice to sell 28,000 shares

ARTV submitted a Rule 144 notice to sell 28,000 shares of Common Stock consisting of restricted stock units that vested under a registered plan on 05/15/2026.

Rhea-AI Filing Summary

ARTV submitted a Rule 144 notice to sell 28,000 shares of Common Stock consisting of restricted stock units that vested under a registered plan on 05/15/2026. The filing lists transaction-related figures including 258,160 and 48,588,198 alongside the 05/18/2026 filing/processing date.

The RSUs are described as compensation for services rendered to the issuer. The filing names Morgan Stanley Smith Barney LLC as the broker and identifies Nasdaq as the trading venue.

Insights

Securities Compliance Counsel

Routine Rule 144 sale notice for vested RSUs; procedural disclosure.

The filing records a Rule 144 notice covering 28,000 shares of Common Stock described as restricted stock units that vested on 05/15/2026. It lists the broker as Morgan Stanley Smith Barney LLC and a processing date of 05/18/2026.

As written, the item is procedural: it documents a planned resale under Rule 144 arising from compensation vesting. Cash‑flow treatment and the identity of the selling party beyond the broker are not specified in the excerpt; subsequent filings or trade reports would show executed sales, if any.

Key Figures

Shares listed for resale: 28,000 shares Additional listed figure: 258,160 Header date and figure: 48,588,198

3 metrics

Shares listed for resale 28,000 shares RSUs vested under registered plan on 05/15/2026

Additional listed figure 258,160 Number shown in filing excerpt alongside 28,000 (as listed in header row)

Header date and figure 48,588,198 Number shown in filing excerpt with date 05/18/2026 (header row)

Key Terms

Restricted Stock Units, Rule 144, registered plan

3 terms

Restricted Stock Units financial

"Restricted Stock Units vesting under registered plan"

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.

Rule 144 regulatory

"Filer Information | 144: Filer Information"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

registered plan financial

"Restricted Stock Units vesting under registered plan"

A registered plan is a savings or investment account that a government recognizes for special tax treatment and rules, such as limits on how much you can put in and conditions for withdrawals. For investors it matters because those rules change how much of your gains are taxed, how quickly your money can be accessed and what strategies make sense — like a labeled jar that gives tax breaks but comes with rules about when and how you can take the money out.

FAQ

What does ARTV's Form 144 disclose about the shares being sold?

The filing discloses 28,000 shares of Common Stock described as restricted stock units that vested under a registered plan on 05/15/2026. It lists Morgan Stanley Smith Barney LLC as the broker and Nasdaq as the trading venue.

Do the disclosed RSUs represent compensation for ARTV?

Yes; the document states the 28,000 RSUs were issued as compensation for services rendered to the issuer and vested under a registered plan on 05/15/2026.

When was the Form 144 processed or filed for ARTV?

The excerpt shows a date of 05/18/2026 associated with the filing/processing and the RSU vesting date of 05/15/2026, indicating the sale notice was submitted shortly after vesting.

Does the Form 144 confirm that the shares have been sold?

No; the filing provides a resale notice under Rule 144 for 28,000 shares but does not confirm execution. Trade execution and proceeds are not specified in the provided excerpt.

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

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Accepted by SEC EDGAR 05/18/2026 - 07:48 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001909362
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	ARTIVA BIOTHERAPEUTICS, INC.
SEC File Number	001-42179
Address of Issuer	5505 MOREHOUSE DRIVE, SUITE 100 SAN DIEGO CALIFORNIA 92121
Phone	(858) 267-4467
Name of Person for Whose Account the Securities are To Be Sold	Fred Aslan, M.D.
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common Stock	Morgan Stanley Smith Barney LLC 1 New York Plaza, 8th Floor New York NY 10004	28000	258160	48588198	05/18/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common Stock	05/15/2026	Restricted Stock Units vesting under registered plan	Issuer			28000	05/15/2026	Compensation for services rendered to Issuer

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks	This is a sell-to-cover transaction for taxes owed related to recent vesting of stock unit awards granted by the Issuer.
Date of Notice	05/18/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Fred Aslan
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)