Tandem Diabetes files Rule 144 to sell 361 shares

Tandem Diabetes Care submitted a Rule 144 notice to sell 361 shares of its common stock represented by Restricted Stock Units, with an issuer-designated sale method dated 06/15/2026.

Rhea-AI Filing Summary

Tandem Diabetes Care submitted a Rule 144 notice to sell 361 shares of its common stock represented by Restricted Stock Units, with an issuer-designated sale method dated 06/15/2026.

Separately, the filing discloses a 10b5-1 sale by Mark Novara of 266 shares on 05/19/2026, reported in the "Securities Sold During The Past 3 Months" section. The filing lists broker details as Morgan Stanley Smith Barney LLC.

Insights

Securities Compliance Counsel

Rule 144 notice lists 361 RSU-based common shares to be sold; prior 10b5-1 sale of 266 shares is disclosed.

Rule 144 forms are procedural notices that specify proposed resale of restricted or control securities under resale conditions. This filing identifies 361 shares tied to Restricted Stock Units with an issuer-designated disposition method dated 06/15/2026.

Documented prior activity includes a 10b5-1 sale by Mark Novara of 266 shares on 05/19/2026. Subsequent filings or confirmations will show actual sale execution and any proceeds; timing and cash-flow treatment are not detailed here.

Key Figures

Registered/offered shares: 361 shares Recent 10b5-1 sale: 266 shares Filing entry date: 06/17/2026

3 metrics

Registered/offered shares 361 shares Restricted Stock Units dated 06/15/2026

Recent 10b5-1 sale 266 shares Sale by Mark Novara on 05/19/2026

Filing entry date 06/17/2026 Filer information line

Key Terms

Rule 144, Restricted Stock Units, 10b5-1

3 terms

Rule 144 regulatory

"Securities To Be Sold ... Restricted Stock Units ... Issuer ... 361"

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.

Restricted Stock Units financial

"Securities To Be Sold | Common | 06/15/2026 | 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.

10b5-1 regulatory

"Securities Sold During The Past 3 Months 10b5-1 Sales for MARK NOVARA"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does Tandem Diabetes Care's (TNDM) Rule 144 filing report?

The filing reports a proposed resale of 361 shares of common stock linked to Restricted Stock Units dated 06/15/2026. It lists Morgan Stanley Smith Barney LLC as the brokerage channel.

Who sold shares under a 10b5-1 plan in the past three months for TNDM?

The filing discloses that Mark Novara executed a 10b5-1 sale of 266 shares on 05/19/2026, recorded in the "Securities Sold During The Past 3 Months" section.

Are the 361 shares in the Rule 144 filing already sold?

No. The Rule 144 entry indicates a proposed resale of 361 shares dated 06/15/2026; the filing does not state that these shares have been sold or report sale proceeds.

What brokerage is listed for the proposed TNDM resale under Rule 144?

The filing lists Morgan Stanley Smith Barney LLC, Executive Financial Services at One New York Plaza, indicating the broker-dealer identified for the transaction.

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

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Accepted by SEC EDGAR 06/17/2026 - 04:27 PM EDT 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	0002000342
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	Tandem Diabetes Care, Inc.
SEC File Number	001-36189
Address of Issuer	12400 High Bluff Drive San Diego CALIFORNIA 92130
Phone	8583666900
Name of Person for Whose Account the Securities are To Be Sold	MARK NOVARA
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

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	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	361	6025.09	68529089	06/17/2026	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	06/15/2026	Restricted Stock Units	Issuer			361	06/15/2026	N/A

* 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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for MARK NOVARA 12400 High Bluff Drive San Diego CA 92130	Common	05/19/2026	266	3598.98

144: Remarks and Signature

Remarks
Date of Notice	06/17/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/04/2025
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/ Mark Novara
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)