Vanguard Portfolio Management reports 2.67M Tidewater holdings (TDW) in 13G

Rhea-AI Filing Summary

Tidewater Inc ownership filing: Vanguard Portfolio Management reports beneficial ownership of 2,668,836 shares of Tidewater common stock, representing 5.38% of the class as of 03/31/2026. The filing shows sole dispositive power over 2,668,836 shares and sole voting power for 42,191 shares. The filing notes that dispositive and voting power reflect holdings managed by Vanguard Portfolio Management LLC and certain Vanguard affiliates.

Insights

Institutional Ownership Analyst

Vanguard holds a 5.38% stake in Tidewater, reported under Schedule 13G.

Vanguard Portfolio Management LLC reports beneficial ownership of 2,668,836 shares and sole dispositive power over the same amount as of 03/31/2026. The filing is consistent with passive institutional reporting under Schedule 13G.

Ownership is aggregated across Vanguard funds and managed accounts per the filing language; the reported 42,191 shares of sole voting power indicates limited voting control versus dispositive control. Subsequent filings would show any change in stake or a switch to Schedule 13D if the ownership becomes active.

Corporate Governance Specialist

Disclosure clarifies which Vanguard entities exercise voting and dispositive powers.

The filing attributes voting and dispositive authority to Vanguard Portfolio Management LLC and affiliates, noting that some holdings are held in Vanguard funds or client accounts. This is a standard explanatory footnote for large asset managers.

Material governance implications are limited: the stake is below typical control thresholds. Any material governance intent would normally trigger different disclosure language or a Schedule 13D filing.

Key Figures

Beneficially owned shares: 2,668,836 shares Percent of class: 5.38% Sole voting power: 42,191 shares +3 more

6 metrics

Beneficially owned shares 2,668,836 shares Amount beneficially owned as reported

Percent of class 5.38% Percent of class as reported (as of 03/31/2026)

Sole voting power 42,191 shares Shares with sole power to vote or direct the vote

Sole dispositive power 2,668,836 shares Shares with sole power to dispose or direct disposition

Filing type Schedule 13G Form type used for passive institutional ownership disclosure

Filing reference date 03/31/2026 Date tied to the reported ownership figures

Key Terms

beneficially owned, sole dispositive power, Schedule 13G, dispositive power

4 terms

beneficially owned regulatory

"this reflects the securities beneficially owned, or deemed to be beneficially owned"

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

"Sole power to dispose or to direct the disposition of: 2668836"

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.

Schedule 13G regulatory

"form_type: SCHEDULE 13G"

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.

dispositive power regulatory

"exercises dispositive power, in addition to securities held by clients"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Tidewater Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

88642R109

(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): 88642R109

1

Names of Reporting Persons

Vanguard Portfolio 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 42,191.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,668,836.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,668,836.00

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)

5.38 %

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 Portfolio Management LLC and the following affiliates of Vanguard Portfolio Management LLC or business divisions of such affiliates: Vanguard Fiduciary Trust Company and Vanguard Global Advisers, LLC. This Schedule 13G includes securities held by Vanguard funds, or sleeves thereof, over which Vanguard Portfolio 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 Portfolio 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: Tidewater Inc
(b)	Address of issuer's principal executive offices: 6002 Rogerdale Road, Suite 600, Houston, TX, 77072
Item 2.
(a)	Name of person filing: Vanguard Portfolio 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): 88642R109
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: 2668836
(b)	Percent of class: 5.38 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 42191
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 2668836
	(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 Portfolio 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 Portfolio Management

Signature:	Ashley Grim
Name/Title:	Head of Global Fund Administration
Date:	04/29/2026

FAQ

How many Tidewater (TDW) shares does Vanguard report owning?

Vanguard reports owning 2,668,836 shares of Tidewater common stock. The filing states this represents 5.38% of the class as of 03/31/2026 and shows dispositive power over those shares.

What voting rights does Vanguard have in the Schedule 13G for TDW?

The filing shows Vanguard has sole voting power over 42,191 shares. It reports sole dispositive power over 2,668,836 shares, indicating voting authority is limited relative to dispositive control.

Does the Schedule 13G indicate Vanguard is an active controller of Tidewater?

No. The filing is a Schedule 13G passive reporting form, indicating institutional investment rather than active control. It lists aggregated holdings across Vanguard entities but does not state activist intent.

Which Vanguard entities are referenced in the Tidewater filing?

The filing attributes holdings to Vanguard Portfolio Management LLC and affiliates including Vanguard Fiduciary Trust Company and Vanguard Global Advisers, LLC. It states holdings include Vanguard funds and managed client accounts.

What date does the ownership figure reference in the filing?

The reported beneficial ownership of 2,668,836 shares and 5.38% is tied to the date 03/31/2026. The Schedule 13G signature appears dated 04/29/2026.