Vanguard reports 8.89M shares (7.35%) of Pinnacle West

Pinnacle West Capital Corp received a Schedule 13G reporting that Vanguard Capital Management beneficially owned 8,892,434 shares of common stock, representing 7.35% of the class as of 03/31/2026.

Rhea-AI Filing Summary

Pinnacle West Capital Corp received a Schedule 13G reporting that Vanguard Capital Management beneficially owned 8,892,434 shares of common stock, representing 7.35% of the class as of 03/31/2026. The filing states Vanguard has sole dispositive power over 8,892,434 shares and sole voting power over 1,090,994 shares. The filing notes these holdings include securities held for Vanguard funds and managed accounts and that Vanguard entities have the right to receive dividends or sale proceeds where applicable.

Insights

Institutional Ownership Analyst

Vanguard reports a 7.35% stake via managed funds and accounts.

The filing lists 8,892,434 shares beneficially owned as of 03/31/2026 with sole dispositive power and limited sole voting power (1,090,994 shares). This is a typical institutional disclosure showing aggregate exposure across funds and client accounts.

Implications: ownership concentration is visible but the filing does not state intent to buy or sell; subsequent filings would show transactional activity. Cash-flow treatment and any holder-specific concentrations are not specified in the excerpt.

Key Figures

Beneficially owned: 8,892,434 shares Percent of class: 7.35% Sole voting power: 1,090,994 shares +3 more

6 metrics

Beneficially owned 8,892,434 shares reported as beneficially owned as of <date>03/31/2026</date>

Percent of class 7.35% percentage of Pinnacle West common stock reported

Sole voting power 1,090,994 shares shares with sole power to vote

Sole dispositive power 8,892,434 shares shares with sole power to dispose or direct disposition

CUSIP 723484101 Pinnacle West Common Stock identifier

Signature date 04/30/2026 date the Schedule 13G was signed by Vanguard's representative

Key Terms

Schedule 13G, beneficially owned, sole dispositive power, Investment Company Act of 1940, +1 more

5 terms

Schedule 13G regulatory

"Item 1. (a) Name of issuer: Pinnacle West Capital Corp"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

beneficially owned financial

"Item 4. (a) Amount beneficially owned: 8892434"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole dispositive power regulatory

"(iii) Sole power to dispose or to direct the disposition of: 8892434"

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.

Investment Company Act of 1940 regulatory

"A listing of the shareholders of an investment company registered under the Investment Company Act of 1940"

A U.S. federal law that sets the rulebook for pooled investment vehicles such as mutual funds, exchange-traded funds and similar money managers, requiring them to register with regulators, disclose holdings and fees, limit conflicts of interest, and follow governance standards. It matters to investors because these protections and transparency rules act like a referee and scoreboard, helping people compare funds, trust that managers follow fair practices, and spot hidden costs or risks.

CUSIP financial

"(e) CUSIP Number(s): 723484101"

A CUSIP is a nine-character alphanumeric code that uniquely identifies a U.S. or Canadian financial security—such as a stock, bond, or fund share—like a Social Security number for an investment. It matters to investors because brokers, exchanges and record-keepers use the CUSIP to match trades, track ownership, settle transactions and pull accurate records, reducing errors and ensuring money and securities go to the right place.

FAQ

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

What stake does Vanguard Capital Management report in PNW?

Vanguard reports beneficial ownership of 8,892,434 shares, representing 7.35% of the common stock. The filing states this position is held across Vanguard funds and managed accounts and includes shares for which Vanguard exercises dispositive power.

What voting and disposition powers does Vanguard report for PNW shares?

Vanguard reports sole voting power over 1,090,994 shares and sole dispositive power over 8,892,434 shares. The filing indicates no shared voting or dispositive power for these amounts.

As of what date is the reported Pinnacle West ownership effective?

The ownership position is reported as of 03/31/2026. The signature on the Schedule 13G is dated 04/30/2026, confirming the filing was executed after the reporting date.

Does the filing identify who receives dividends or sale proceeds for these PNW shares?

The filing states Vanguard entities, including funds and managed accounts, have the right to receive dividends or proceeds where applicable. It notes no single other person holds more than 5% of the class.

Who signed the Schedule 13G for Vanguard Capital Management?

The Schedule 13G is signed by Ashley Grim, titled Head of Global Fund Administration, with a signature date of 04/30/2026. The filing lists Vanguard's business address in Malvern, Pennsylvania.

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

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Accepted by SEC EDGAR 04/30/2026 - 12:14 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Pinnacle West Capital Corp

(Name of Issuer)

Common Stock

(Title of Class of Securities)

723484101

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 723484101

1

Names of Reporting Persons

Vanguard Capital Management

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

PENNSYLVANIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,090,994.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 8,892,434.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

8,892,434.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

7.35 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by Vanguard Capital Management LLC and the following affiliates of Vanguard Capital Management LLC or business divisions of such affiliates: Vanguard Asset Management Limited, Vanguard Fiduciary Trust Company, Vanguard Global Advisers, LLC and Vanguard Investments Australia Ltd. This Schedule 13G includes securities held by Vanguard funds, or sleeves thereof, over which Vanguard Capital Management LLC exercises dispositive power, in addition to securities held by clients over which the affiliates or business divisions of such affiliates indicated above exercise dispositive and/or voting power. This Schedule 13G does not include securities, if any, beneficially owned by other subsidiaries or affiliates of Vanguard Capital Management LLC, or business divisions of such subsidiaries, whose ownership of securities is disaggregated from that of the reporting business unit in accordance with such release.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Pinnacle West Capital Corp
(b)	Address of issuer's principal executive offices: 400 North 5th Street, PO Box 53999, Phoenix, AZ, 85004
Item 2.
(a)	Name of person filing: Vanguard Capital Management
(b)	Address or principal business office or, if none, residence: 100 Vanguard Blvd,, Malvern, PA, 19355
(c)	Citizenship: PA
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 723484101
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 8892434
(b)	Percent of class: 7.35 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1090994
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 8892434
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. Vanguard Capital Management, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein.No one other person's interest in the securities reported herein is more than 5%.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

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.

Vanguard Capital Management

Signature:	Ashley Grim
Name/Title:	Head of Global Fund Administration
Date:	04/30/2026