Westfield reports 5.01% stake in IMAX

Westfield Capital Management Company, L.P. reported beneficial ownership of 2,704,872 shares of IMAX Corp, representing 5.01% of the outstanding common stock as of 04/30/2026.

Rhea-AI Filing Summary

Westfield Capital Management Company, L.P. reported beneficial ownership of 2,704,872 shares of IMAX Corp, representing 5.01% of the outstanding common stock as of 04/30/2026. The filing shows sole voting power of 2,572,557 shares and sole dispositive power of 2,704,872. Westfield states these shares are owned of record by its clients in its capacity as investment adviser and that, to its knowledge, no single client holds more than 5.0% of the class. The Schedule 13G was signed on 05/05/2026.

Insights

Institutional Ownership Analyst

Passive investor reports a >5% stake in IMAX, held on behalf of clients.

Westfield's Schedule 13G discloses a 5.01% beneficial ownership position and specifies sole voting and dispositive powers in the filing. The form and language indicate an investment adviser reporting client holdings rather than direct corporate control.

Key dependencies include whether Westfield amends ownership or converts to a Schedule 13D; subsequent filings would change the public signaling. Timing shown: holdings reported as of 04/30/2026 and signed 05/05/2026.

Key Figures

Beneficial ownership: 2,704,872 shares Percent of class: 5.01% Sole voting power: 2,572,557 shares +2 more

5 metrics

Beneficial ownership 2,704,872 shares as of 04/30/2026

Percent of class 5.01% IMAX common stock

Sole voting power 2,572,557 shares reported voting authority

Sole dispositive power 2,704,872 shares reported disposition authority

Filing signature date 05/05/2026 Schedule 13G signature date

Key Terms

Schedule 13G, Beneficially owned, Sole dispositive power

3 terms

Schedule 13G regulatory

"If any other person is known to have the right to receive"

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

"Amount beneficially owned: 2,704,872"

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: 2,704,872"

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.

What stake does Westfield Capital report in IMAX (IMAX)?

Westfield reports beneficial ownership of 2,704,872 shares, equal to 5.01% of IMAX common stock as of 04/30/2026. The filing classifies the position as held of record for Westfield's clients with no single client exceeding 5%.

Does Westfield have voting control over the IMAX shares?

The filing shows sole voting power for 2,572,557 shares and sole dispositive power for 2,704,872 shares. Those numbers reflect Westfield's reported authority to vote and direct disposition for the shares listed in the Schedule 13G.

Are the IMAX shares owned directly by Westfield or its clients?

The Schedule 13G states the shares are owned of record by Westfield's clients and reported in Westfield's capacity as investment adviser. Westfield says no known client holds more than 5% of the class.

When were the IMAX holdings reported and signed?

The ownership is reported as of 04/30/2026 and the filing was signed on 05/05/2026. Those dates establish the reporting cutoff and the signature date on the Schedule 13G submission.

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

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Accepted by SEC EDGAR 05/05/2026 - 04:18 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

IMAX CORP

(Name of Issuer)

Common Stock

(Title of Class of Securities)

45245E109

(CUSIP Number)

04/30/2026

(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): 45245E109

1

Names of Reporting Persons

Westfield Capital Management Company, L.P.

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

MASSACHUSETTS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,572,557.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,704,872.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,704,872.00

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)

5.01 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: IMAX CORP
(b)	Address of issuer's principal executive offices: 2525 SPEAKMAN DRIVE, MISSISSAUGA, ONTARIO, CANADA L5K 1B1
Item 2.
(a)	Name of person filing: Westfield Capital Management Company, L.P.
(b)	Address or principal business office or, if none, residence: 1 Financial Center, 24th Floor Boston, Massachusetts 02111
(c)	Citizenship: Westfield Capital Management Company, L.P. - MASSACHUSETTS
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 45245E109
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: 2,704,872
(b)	Percent of class: 5.01 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Westfield Capital Management Company, L.P. - 2,572,557
	(ii) Shared power to vote or to direct the vote: Westfield Capital Management Company, L.P. - 0
	(iii) Sole power to dispose or to direct the disposition of: Westfield Capital Management Company, L.P. - 2,704,872
	(iv) Shared power to dispose or to direct the disposition of: Westfield Capital Management Company, L.P. - 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. The shares of the security listed in this Schedule are owned of record by clients of Westfield Capital Management Company, L.P. (Westfield) in its capacity as investment adviser. Westfield's clients have the right to receive, or the power to direct the receipt of, dividends or proceeds from the sale of the shares. To the best of Westfield's knowledge, no client has such right or power with respect to more than five percent of this class of security.
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.

Westfield Capital Management Company, L.P.

Signature:	Brandi McMahon
Name/Title:	Vice President, Deputy Chief Compliance Officer
Date:	05/05/2026