Capital World Investors holds 8.3% of TransDigm (NYSE: TDG) — Schedule 13G/A

Rhea-AI Filing Summary

TransDigm Group Inc. disclosed an amended Schedule 13G showing Capital World Investors reported beneficial ownership of 4,705,728 shares of common stock, representing 8.3% of the 56,473,563 shares believed to be outstanding as of 03/31/2026. The filing lists sole voting power for 4,697,654 shares and sole dispositive power for 4,705,728 shares. The amendment is signed by a Capital Research and Management Company officer on 05/13/2026.

Insights

Institutional Ownership Analyst

Large passive holding disclosed by an institutional investor.

Capital World Investors reports ownership of 4,705,728 shares, equal to 8.3% of TransDigm's common stock as of 03/31/2026. The filing is an amended Schedule 13G, which typically indicates an institutional, non‑control position under the reporting rules.

Future disclosures in company filings may show changes; the current disclosure notes both voting and dispositive powers held by the reporting entities. Cash‑flow treatment and any planned transactions are not included in the excerpt.

Corporate Governance Specialist

Ownership stake provides visibility into shareholder composition but not control.

The filing attributes sole voting power for 4,697,654 shares and sole dispositive power for 4,705,728 shares, indicating the reporting group can vote and direct disposition of the shares disclosed. The filing uses the term "believed to be outstanding" for the 56,473,563 share base.

As an amended Schedule 13G, the disclosure signals institutional ownership reporting rather than an acquisition intent; any governance implications depend on subsequent filings or actions by the holder.

Key Figures

Beneficial ownership: 4,705,728 shares Ownership percent: 8.3% Sole voting power: 4,697,654 shares +2 more

5 metrics

Beneficial ownership 4,705,728 shares reported as beneficially owned by Capital World Investors

Ownership percent 8.3% of 56,473,563 shares believed to be outstanding as of <date>03/31/2026</date>

Sole voting power 4,697,654 shares sole power to vote reported by the filing

Sole dispositive power 4,705,728 shares sole power to dispose reported by the filing

Shares outstanding (base) 56,473,563 shares shares believed to be outstanding used to compute the <percent>8.3%</percent>

Key Terms

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

3 terms

Schedule 13G/A regulatory

"Amendment No. 2 ) TransDigm Group Inc. Common Stock"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

beneficially owned financial

"CWI is deemed to be the beneficial owner of 4,705,728 shares"

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: 4,705,728"

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.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)

TransDigm Group Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

893641100

(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): 893641100

1

Names of Reporting Persons

Capital World Investors

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 4,697,654.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 4,705,728.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,705,728.00

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)

8.3 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: TransDigm Group Inc.
(b)	Address of issuer's principal executive offices: 1350 Euclid Ave, Suite 1600, Cleveland, OH 44115, United States of America
Item 2.
(a)	Name of person filing: Capital World Investors
(b)	Address or principal business office or, if none, residence: 333 SOUTH HOPE STREET, 55TH FLOOR, LOS ANGELES, CALIFORNIA 90071
(c)	Citizenship: N/A
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 893641100
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: 4,705,728 ** **Capital World Investors ("CWI") is a division of Capital Research and Management Company ("CRMC"), as well as its investment management subsidiaries and affiliates Capital Bank and Trust Company, Capital International, Inc., Capital International Limited, Capital International Sarl, Capital International K.K., Capital Group Private Client Services, Inc., and Capital Group Investment Management Private Limited (together with CRMC, the "investment management entities"). CWI's divisions of each of the investment management entities collectively provide investment management services under the name "Capital World Investors." CWI is deemed to be the beneficial owner of 4,705,728 shares or 8.3% of the 56,473,563 shares believed to be outstanding.
(b)	Percent of class: 8.3 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 4,697,654
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 4,705,728
	(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.
	Not Applicable
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.

Capital World Investors

Signature:	Jae Won Chung
Name/Title:	Senior Vice President and Associate General Counsel, Capital Research and Management Company
Date:	05/13/2026

FAQ

What stake did Capital World Investors report in TDG?

Capital World Investors reported beneficial ownership of 4,705,728 shares, representing 8.3% of TransDigm's common stock as of 03/31/2026. The position is disclosed on an amended Schedule 13G.

Does the filing show voting or disposal authority for the TDG shares?

Yes. The filing lists sole voting power for 4,697,654 shares and sole dispositive power for 4,705,728 shares, indicating control over voting and disposition of the disclosed shares.

How many TransDigm shares were outstanding per the filing?

The filing states there were 56,473,563 shares believed to be outstanding as the base for the ownership percentage. That figure is tied to the reported 03/31/2026 reference in the excerpt.

What form was filed to report this ownership for TDG?

The holder filed an amended Schedule 13G (SCHEDULE 13G/A) to report the position. This form is used by certain institutional investors to disclose beneficial ownership under applicable rules.

Who signed the amended Schedule 13G for TDG?

The amendment was signed by Jae Won Chung, Senior Vice President and Associate General Counsel of Capital Research and Management Company, dated 05/13/2026.