Teradata CEO sells 10,000 shares at about $30

TERADATA CORP (TDC) reported that President and CEO Stephen McMillan, who is also a director, sold 10,000 shares of common stock on September 15, 2026, in an open-market transaction under a Rule 10b5-1 trading plan adopted on May 18, 2026.

Rhea-AI Filing Summary

TERADATA CORP (TDC) reported that President and CEO Stephen McMillan, who is also a director, sold 10,000 shares of common stock on September 15, 2026, in an open-market transaction under a Rule 10b5-1 trading plan adopted on May 18, 2026. After this sale, he held 752,446 shares directly.

Insider Trade Summary 10b5-1

Net Seller: 10,000 shares

Net Sell 1 txn

Insider MCMILLAN STEPHEN

Role President and CEO

Sold 10,000 shs ($300K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	10,000	$30.017	$300K

Holdings After Transaction: Common Stock — 752,446 shares (Direct)

Footnotes (2)

1. F1. Sale of shares pursuant to Rule 10b5-1 trading plan adopted by the Reporting Person on May 18, 2026.
2. F2. The price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.00 to $30.05. The reporting person has provided to the issuer and will provide any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

Key Figures

Shares sold: 10,000 shares Weighted average sale price: $30.017 per share Sale price range: $30.00 – $30.05 per share +2 more

5 metrics

Shares sold 10,000 shares Common stock sold by CEO on September 15, 2026

Weighted average sale price $30.017 per share Average price for the 10,000 shares sold on September 15, 2026

Sale price range $30.00 – $30.05 per share Range of prices across multiple sale transactions on September 15, 2026

Shares held after transaction 752,446 shares Direct ownership by CEO after the September 15, 2026 sale

Rule 10b5-1 plan adoption date May 18, 2026 Date CEO adopted the trading plan governing this sale

Key Terms

Rule 10b5-1 trading plan, weighted average price, open market or private transaction

3 terms

Rule 10b5-1 trading plan regulatory

"Sale of shares pursuant to Rule 10b5-1 trading plan adopted"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"The price in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

open market or private transaction market

"Sale in open market or private transaction"

FAQ

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

What insider transaction did TDC report for CEO Stephen McMillan?

Teradata reported that CEO and director Stephen McMillan sold 10,000 shares of common stock on September 15, 2026 in an open-market transaction, as disclosed in a Form 4 filing.

At what prices were the 10,000 TDC shares sold by the CEO?

The filing states a weighted average price of $30.017 per share, with individual sale prices ranging from $30.00 to $30.05 across multiple transactions on September 15, 2026.

How many TDC shares does the CEO own after this reported sale?

Following the September 15, 2026 sale, CEO Stephen McMillan directly owned 752,446 shares of Teradata common stock, as reported in the Form 4.

Was the September 15, 2026 TDC stock sale by the CEO under a Rule 10b5-1 plan?

Yes. The sale was made pursuant to a Rule 10b5-1 trading plan that Stephen McMillan adopted on May 18, 2026, and the filing’s Rule 10b5-1 checkbox is affirmed.

What type of transaction did the TDC Form 4 report for the CEO?

The Form 4 reports a sale of common stock in the open market or a private transaction, coded as a disposition, totaling 10,000 shares on September 15, 2026.

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

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Available on EDGAR 09/17/2026 - 02:09 PM Accepted by SEC EDGAR 09/17/2026 - 02:09 PM Learn about SEC filing dates

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
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).

X

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^*

MCMILLAN STEPHEN

(Last) (First) (Middle)

C/O TERADATA CORPORATION

17095 VIA DEL CAMPO

(Street)

SAN DIEGO CALIFORNIA 92127

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
TERADATA CORP /DE/ [ TDC ]

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

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President and CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/15/2026

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

X	Form 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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/15/2026		S(1)		10,000	D	$30.017(2)	752,446	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. Sale of shares pursuant to Rule 10b5-1 trading plan adopted by the Reporting Person on May 18, 2026.

2. The price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.00 to $30.05. The reporting person has provided to the issuer and will provide any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

Remarks:

	/s/ Irving Gomez, Attorney-in-fact for Stephen McMillan	09/17/2026
	** 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.
* Form 4: SEC 1474 (03-26)