Tandem Diabetes (NASDAQ: TNDM) Form 144: 266 RSUs slated for sale

Rhea-AI Filing Summary

Tandem Diabetes (TNDM) filing under Rule 144 reports an intended sale of 266 shares of Common stock tied to Restricted Stock Units, dated 05/15/2026. The filing also lists prior 10b5-1 sales by Mark Novara of 187 shares on 03/17/2026 and 2 shares on 03/05/2026.

Insights

Securities Compliance Analyst

Routine Rule 144 filing showing planned RSU sale and recent 10b5-1 executions.

The filing lists an intended sale of 266 shares from Restricted Stock Units dated 05/15/2026, plus two recent 10b5-1 sales of 187 and 2 shares on 03/17/2026 and 03/05/2026. This pattern is consistent with scheduled dispositions under a trading plan.

Cash‑flow treatment and recipient details are not included in the excerpt; subsequent filings or broker confirmations would state settlement amounts and recipients.

Key Figures

Planned sale: 266 shares Prior 10b5-1 sale: 187 shares Prior 10b5-1 sale: 2 shares +2 more

5 metrics

Planned sale 266 shares Restricted Stock Units dated 05/15/2026

Prior 10b5-1 sale 187 shares Sold on 03/17/2026 (Mark Novara)

Prior 10b5-1 sale 2 shares Sold on 03/05/2026 (Mark Novara)

Transaction dollar amount (excerpt) $4,310.35 Associated with 03/17/2026 sale as shown in excerpt

Transaction dollar amount (excerpt) $45.62 Associated with 03/05/2026 sale as shown in excerpt

Key Terms

10b5-1, Restricted Stock Units, Form 144

3 terms

10b5-1 regulatory

"10b5-1 Sales for MARK NOVARA 12400 High Bluff Drive San Diego"

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.

Restricted Stock Units financial

"Securities To Be Sold Common 05/15/2026 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.

Form 144 regulatory

"Filer Information | 144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	266	3598.98	68529089	05/19/2026	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	05/15/2026	Restricted Stock Units	Issuer			266	05/15/2026	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	03/17/2026	187	4310.35
10b5-1 Sales for MARK NOVARA 12400 High Bluff Drive San Diego CA 92130	Common	03/05/2026	2	45.62

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the TNDM Form 144 disclose about planned sales?

The filing discloses an intended sale of 266 shares tied to Restricted Stock Units dated 05/15/2026. It specifies the security type and sale date but does not list proceeds or receiving broker details in the excerpt.

Were there recent insider sales for TNDM reported in the filing?

Yes. The filing reports prior 10b5-1 sales by Mark Novara of 187 shares on 03/17/2026 and 2 shares on 03/05/2026, with dollar figures shown in the excerpt alongside those transactions.

Are the 266 shares being sold unrestricted or from RSUs for TNDM?

The 266 shares are tied to Restricted Stock Units dated 05/15/2026, indicating the sale originates from RSU awards rather than open‑market holdings; the excerpt does not state any holding‑period waiver or additional conditions.

Does the filing indicate sales were made under a 10b5-1 plan?

The filing explicitly labels the prior transactions on 03/17/2026 and 03/05/2026 as 10b5-1 Sales for Mark Novara, indicating those prior dispositions were executed under a prearranged trading plan.