Cable One: Graham reports approximately 6.88% stake

Donald E. Graham stated that he currently intends in the near term to dispose of some or all of the Cable One common stock he beneficially owns.

Rhea-AI Filing Summary

Cable One, Inc. (CABO) shares were sold in the open market by trusts for which Donald E. Graham, Chairman Emeritus of Graham Holdings Company, shared voting and investment power with the other trustee, Daniel L. Mosley. On October 13, 2026, trusts (c), (e), (f) and (g) sold 11,683 shares at a weighted average price of $11.72, 19,200 at $13.02, 500 at $11.72 and 15,879 at $13.02 per share, respectively; trusts for two other beneficiaries sold 1,044 shares at $12.27.

On October 14, 2026, those four trusts sold 11,683 shares at a weighted average price of $9.44, 9,600 at $9.00, 500 at $9.44 and 7,940 at $9.00 per share, respectively. As of October 14, 2026, Graham was reported as beneficial owner of 390,361 shares, approximately 6.88% of the class. He currently intends in the near term to dispose of some or all of the common stock he beneficially owns.

Key Figures

Beneficial ownership: 390,361 shares Ownership of class: Approximately 6.88% Shares outstanding: 5,673,925 shares +5 more

8 metrics

Beneficial ownership 390,361 shares Donald E. Graham, as of October 14, 2026

Ownership of class Approximately 6.88% Donald E. Graham, as of October 14, 2026

Shares outstanding 5,673,925 shares Cable One common stock as of July 31, 2026

Trust (c) sale 11,683 shares at a weighted average price of $11.72 per share October 13, 2026

Trust (e) sale 19,200 shares at a weighted average price of $13.02 per share October 13, 2026

Sale by trusts for two other beneficiaries 1,044 shares at a weighted average price of $12.27 per share October 13, 2026

Trust (c) sale 11,683 shares at a weighted average price of $9.44 per share October 14, 2026

Trust (e) sale 9,600 shares at a weighted average price of $9.00 per share October 14, 2026

Key Terms

beneficial owner, shared voting and investment power, weighted average price, revocable trust, +1 more

5 terms

beneficial owner regulatory

"beneficial owner (as determined in accordance with Rule 13d-3"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

shared voting and investment power regulatory

"shared voting and investment power with respect to such shares"

weighted average price financial

"at a weighted average price of $11.72 per share"

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.

revocable trust regulatory

"held in a revocable trust for the benefit of Mr. Graham"

A revocable trust is a legal arrangement where the person who creates it keeps control and can change or cancel the trust at any time, while naming who will manage and receive the assets later. Think of it like a flexible folder for your investments and property that can be relabeled or reworked as circumstances change; it matters to investors because it determines how ownership is recorded, how easily assets transfer on incapacity or death, and whether holdings bypass public probate proceedings.

sole dispositive power regulatory

"Sole Dispositive Power 74,121.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

FAQ

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

How many CABO shares did the trusts sell on October 13 and 14, 2026?

On October 13, 2026, trusts (c), (e), (f) and (g) sold 11,683, 19,200, 500 and 15,879 shares, respectively, at weighted average prices of $11.72, $13.02, $11.72 and $13.02 per share; trusts for two other beneficiaries sold 1,044 shares at $12.27. On October 14, the four trusts sold 11,683, 9,600, 500 and 7,940 shares, respectively, at weighted average prices of $9.44, $9.00, $9.44 and $9.00 per share.

How many CABO shares did Donald E. Graham beneficially own?

As of October 14, 2026, Donald E. Graham was reported as beneficial owner of 390,361 shares, approximately 6.88% of Cable One's common stock.

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

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Available on EDGAR 10/14/2026 - 09:56 PM EDT Accepted by SEC EDGAR 10/14/2026 - 09:55 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 6)

Cable One, Inc.

(Name of Issuer)

Common Stock, par value $0.01 per share

(Title of Class of Securities)

12685J105

(CUSIP Number)

Graham Holdings Company
c/o Nicole M. Maddrey, 1812 North Moore Street
Arlington, VA, 22209
(703) 345-6300

Copy to: Nicholas A. Dorsey
Cravath, Swaine & Moore LLP, 375 Ninth Avenue
New York, NY, 10001
(212) 474-1000

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

10/13/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 12685J105

1

Name of reporting person

Donald E. Graham

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 74,121.00
8	Shared Voting Power 316,240.00
9	Sole Dispositive Power 74,121.00
10	Shared Dispositive Power 316,240.00

11

Aggregate amount beneficially owned by each reporting person

390,361.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

6.88 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

Note to row 13: Calculated based on 5,673,925 shares of common stock, par value $0.01 per share, of Cable One, Inc. outstanding as of July 31, 2026

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Stock, par value $0.01 per share
(b)	Name of Issuer: Cable One, Inc.
(c)	Address of Issuer's Principal Executive Offices: 210 E. EARLL DRIVE, PHOENIX, ARIZONA , 85012.
Item 1 Comment: Explanatory Note: This statement on Schedule 13D (this "Statement") relates to the common stock, par value $0.01 per share, of Cable One, Inc. The statement on Schedule 13D filed by Donald E. Graham dated July 2, 2015 (as amended as of November 13, 2015, as of December 22, 2017, as of January 18, 2018, as of December 16, 2019 and as of May 8, 2023, the "Schedule 13D"), is hereby amended and supplemented as set forth below. All capitalized terms not otherwise defined herein shall have the meanings ascribed to them in the Schedule 13D.
Item 2.	Identity and Background
(b)	The description set forth in Item 2(b) and Item 2(c) of the Schedule 13D is hereby amended in its entirety to read as follows: Mr. Graham's business address is c/o Graham Holdings Company ("GHC"), 1812 North Moore Street, Arlington, VA 22209.
(c)	Mr. Graham's present principal occupation is Chairman Emeritus of GHC.
Item 4.	Purpose of Transaction
	The second paragraph of Item 4 of the Schedule 13D is hereby amended in its entirety to read as follows: Mr. Graham currently intends in the near term to make dispositions of some or all of the Common Stock he beneficially owns. Otherwise, Mr. Graham currently has no plans or proposals that relate to or would result in any of the actions listed in paragraphs (a) through (j) of Item 4 of the Form of Schedule 13D promulgated under the Act. However, Mr. Graham reserves the right to change his plans at any time, as he may deem appropriate.
Item 5.	Interest in Securities of the Issuer
(a)	Item 5(a) through Item 5(c) of the Schedule 13D is hereby amended in its entirety to read as follows: Interests of Mr. Graham: As of October 14, 2026, Mr. Graham was the beneficial owner (as determined in accordance with Rule 13d-3(a), (c) and (d) under the Act) of 390,361 shares of Common Stock, constituting approximately 6.88% of such shares outstanding (as determined in accordance with Rule 13d-3(d)(1) under the Act). Such beneficial ownership was as set forth in paragraphs (a) through (g) below. Except as to the extent of: (A) his shared fiduciary voting and investment power with respect to, and beneficial interest in, the shares held in the trust referred to in paragraph (g) below and (B) his shared fiduciary voting and investment power with respect to the shares held in the trust referred to in paragraph (f) below, Mr. Graham has no beneficial interest, and expressly disclaims any beneficial interest, in the shares referred to in such paragraphs (f) and (g). (a) 18,194 shares of Common Stock owned by Mr. Graham, as to which he had sole voting and investment power. (b) 55,927 shares of Common Stock held in a revocable trust for the benefit of Mr. Graham. Mr. Graham, as settlor, had sole voting and dispositive power with respect to such shares. Mr. Graham has the right to revoke such trust at any time. (c) 93,464 shares of Common Stock held in a trust for the benefit of Mr. Graham. Mr. Graham, as a trustee, shared voting and investment power with respect to such shares with Daniel L. Mosley, the other trustee. (d) 96,000 shares of Common Stock held in a trust for the benefit of Mr. Graham. Mr. Graham, as a trustee, shared voting and investment power with respect to such shares with Mr. Mosley, the other trustee. (e) 67,200 shares of Common Stock held in a trust for the benefit of Mr. Graham. Mr. Graham, as a trustee, shared voting and investment power with respect to such shares with Mr. Mosley, the other trustee. (f) 4,000 shares of Common Stock held in a trust for the benefit of another. Mr. Graham, as a trustee, shared voting and investment power with respect to such shares with Mr. Mosley, the other trustee. (g) 55,576 shares of Common Stock held in a trust for the benefit of Mr. Graham. Mr. Graham, as a trustee, shared voting and investment power with respect to such shares with Mr. Mosley, the other trustee.
(c)	Transactions During the Past Sixty Days: On October 13, 2026, (i) the trust set forth under (c) above sold 11,683 shares of Common Stock in the open market at a weighted average price of $11.72 per share, (ii) the trust set forth under (e) above sold 19,200 shares of Common Stock in the open market at a weighted average price of $13.02 per share, (iii) the trust set forth under (f) above sold 500 shares of Common Stock in the open market at a weighted average price of $11.72 per share, (iv) the trust set forth under (g) above sold 15,879 shares of Common Stock in the open market at a weighted average price of $13.02 per share and (v) trusts for the benefit of two persons of which Mr. Graham, as a trustee, shared voting and investment power with respect to such shares with Mr. Mosley, the other trustee, sold 1,044 shares of Common Stock in the open market at a weighted average price of $12.27 per share. On October 14, 2026, (i) the trust set forth under (c) above sold 11,683 shares of Common Stock in the open market at a weighted average price of $9.44 per share, (ii) the trust set forth under (e) above sold 9,600 shares of Common Stock in the open market at a weighted average price of $9.00 per share, (iii) the trust set forth under (f) above sold 500 shares of Common Stock in the open market at a weighted average price of $9.44 per share and (iv) the trust set forth under (g) above sold 7,940 shares of Common Stock in the open market at a weighted average price of $9.00 per share.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Donald E. Graham

Signature:	/s/ Donald E. Graham
Name/Title:	Donald E. Graham
Date:	10/14/2026