Alarm.com (ALRM): Bank of Montreal group reports 6.98% ownership stake

Rhea-AI Filing Summary

Bank of Montreal and affiliates report a significant ownership position in Alarm.com Holdings, Inc. They report beneficial ownership of 3,455,201 shares of Alarm.com common stock, representing 6.98% of the class as of June 30, 2026. The shares are held across several related entities, including 1001271606 Ontario Inc. and Burgundy Asset Management, Inc., with Bank of Montreal itself having sole voting power over 2,576,689 shares and sole dispositive power over 3,455,201 shares. The reporting persons state they may be deemed part of a group for Section 13(d) or 13(g) purposes but expressly disclaim being part of any partnership, syndicate, or group with respect to Alarm.com securities.

Key Figures

Beneficial ownership: 3,455,201 shares Percent of class: 6.98 % Bank of Montreal sole voting power: 2,576,689 shares +2 more

5 metrics

Beneficial ownership 3,455,201 shares Shares of Alarm.com common stock beneficially owned by Bank of Montreal and affiliates

Percent of class 6.98 % Percentage of Alarm.com common stock class beneficially owned

Bank of Montreal sole voting power 2,576,689 shares Shares of Alarm.com over which Bank of Montreal has sole voting power

Bank of Montreal sole dispositive power 3,455,201 shares Shares of Alarm.com over which Bank of Montreal has sole dispositive power

1001271606 Ontario Inc. beneficial ownership 3,129,915 shares Alarm.com shares beneficially owned by 1001271606 Ontario Inc.

Key Terms

beneficially owned, sole power to vote, sole dispositive power, Section 13(d) or 13(g), +1 more

5 terms

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned: 3,455,201"

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 power to vote financial

"Number of shares as to which the person has | (i) Sole power to vote"

sole dispositive power financial

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

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.

Section 13(d) or 13(g) regulatory

"for the purposes of Section 13(d) or 13(g) of the Act"

Schedule 13G regulatory

"Each reporting person may be deemed to be a member of a group with respect to the issuer"

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.

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

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Available on EDGAR 08/12/2026 - 11:09 AM Accepted by SEC EDGAR 08/12/2026 - 11:08 AM Learn about SEC filing dates

FAQ

What percentage of Alarm.com (ALRM) does Bank of Montreal report owning?

Bank of Montreal and related entities report beneficial ownership of 6.98% of Alarm.com’s common stock, representing 3,455,201 shares as of June 30, 2026, according to this Schedule 13G/A amendment.

How many Alarm.com (ALRM) shares are beneficially owned by Bank of Montreal and affiliates?

They report beneficial ownership of 3,455,201 Alarm.com common shares. Bank of Montreal reports sole voting power over 2,576,689 of these shares and sole dispositive power over 3,455,201 shares across its affiliated entities.

Which Bank of Montreal entities hold Alarm.com (ALRM) shares in this Schedule 13G/A?

Reporting persons include Bank of Montreal, Bank of Montreal Holding Inc., BMO Nesbitt Burns Inc., BMO Asset Management Inc., BMO Financial Corp., BMO Bank N.A., BMO Family Office, LLC, 1001271606 Ontario Inc., and Burgundy Asset Management, Inc..

Does Bank of Montreal claim to be part of a group regarding Alarm.com (ALRM) stock?

The reporting persons state they may be deemed members of a group for Section 13(d) or 13(g) purposes, but they expressly disclaim that they are acting as a partnership, syndicate, or group regarding Alarm.com securities.

What level of voting power does Bank of Montreal report for Alarm.com (ALRM) shares?

Bank of Montreal reports sole voting power over 2,576,689 shares of Alarm.com common stock and no shared voting power. Several affiliated entities also report sole voting power over smaller share amounts.

Who signed the Schedule 13G/A for the Bank of Montreal position in Alarm.com (ALRM)?

The filing is signed by Kathryn Cenac, identified as Managing Director - Regulatory Solutions Group, with multiple signature blocks dated August 12, 2026 for the various reporting entities.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Alarm.com Holdings, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

011642105

(CUSIP Number)

06/30/2026

(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): 011642105

1

Names of Reporting Persons

Bank of Montreal

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

Unknown

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,576,689.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 3,455,201.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,455,201.00

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)

6.98 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): 011642105

1

Names of Reporting Persons

BANK OF MONTREAL HOLDING INC.

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

CANADA (FEDERAL LEVEL)

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 3,409.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 3,409.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,409.00

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)

0 %

12

Type of Reporting Person (See Instructions)

BK

SCHEDULE 13G

CUSIP Number(s): 011642105

1

Names of Reporting Persons

BMO NESBITT BURNS INC.

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

CANADA (FEDERAL LEVEL)

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 3,409.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 3,409.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,409.00

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)

0 %

12

Type of Reporting Person (See Instructions)

BD

SCHEDULE 13G

CUSIP Number(s): 011642105

1

Names of Reporting Persons

BMO ASSET MANAGEMENT INC.

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

ONTARIO, CANADA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 3,392.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 3,392.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,392.00

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)

0 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP Number(s): 011642105

1

Names of Reporting Persons

BMO FINANCIAL CORP.

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 815.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,882.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,882.00

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)

0 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): 011642105

1

Names of Reporting Persons

BMO BANK N.A.

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

ILLINOIS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 815.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,273.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,273.00

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)

0 %

12

Type of Reporting Person (See Instructions)

BK

SCHEDULE 13G

CUSIP Number(s): 011642105

1

Names of Reporting Persons

BMO FAMILY OFFICE, LLC

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 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 609.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

609.00

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)

0 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP Number(s): 011642105

1

Names of Reporting Persons

1001271606 ONTARIO INC

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

CANADA (FEDERAL LEVEL)

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,252,470.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 3,129,915.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,129,915.00

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)

6.32 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): 011642105

1

Names of Reporting Persons

Burgundy Asset Management, Inc.

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

CANADA (FEDERAL LEVEL)

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,252,470.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 3,129,915.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,129,915.00

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)

6.32 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Alarm.com Holdings, Inc.
(b)	Address of issuer's principal executive offices: 8281 GREENSBORO DRIVE, SUITE 100, TYSONS, VIRGINIA 22102
Item 2.
(a)	Name of person filing: Bank of Montreal BANK OF MONTREAL HOLDING INC. BMO NESBITT BURNS INC. BMO ASSET MANAGEMENT INC. BMO FINANCIAL CORP. BMO BANK N.A. BMO FAMILY OFFICE, LLC 1001271606 ONTARIO INC Burgundy Asset Management, Inc.
(b)	Address or principal business office or, if none, residence: 1 First Canadian Place Toronto, Ontario, Canada M5X1A1
(c)	Citizenship: Bank of Montreal - UNKNOWN BANK OF MONTREAL HOLDING INC. - CANADA (FEDERAL LEVEL) BMO NESBITT BURNS INC. - CANADA (FEDERAL LEVEL) BMO ASSET MANAGEMENT INC. - ONTARIO, CANADA BMO FINANCIAL CORP. - DELAWARE BMO BANK N.A. - ILLINOIS BMO FAMILY OFFICE, LLC - DELAWARE 1001271606 ONTARIO INC - CANADA (FEDERAL LEVEL) Burgundy Asset Management, Inc. - CANADA (FEDERAL LEVEL)
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 011642105
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: 3,455,201
(b)	Percent of class: 6.98 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Bank of Montreal - 2,576,689 BANK OF MONTREAL HOLDING INC. - 3,409 BMO NESBITT BURNS INC. - 3,409 BMO ASSET MANAGEMENT INC. - 3,392 BMO FINANCIAL CORP. - 815 BMO BANK N.A. - 815 BMO FAMILY OFFICE, LLC - 0 1001271606 ONTARIO INC - 2,252,470 Burgundy Asset Management, Inc. - 2,252,470
	(ii) Shared power to vote or to direct the vote: Bank of Montreal - 0 BANK OF MONTREAL HOLDING INC. - 0 BMO NESBITT BURNS INC. - 0 BMO ASSET MANAGEMENT INC. - 0 BMO FINANCIAL CORP. - 0 BMO BANK N.A. - 0 BMO FAMILY OFFICE, LLC - 0 1001271606 ONTARIO INC - 0 Burgundy Asset Management, Inc. - 0
	(iii) Sole power to dispose or to direct the disposition of: Bank of Montreal - 3,455,201 BANK OF MONTREAL HOLDING INC. - 3,409 BMO NESBITT BURNS INC. - 3,409 BMO ASSET MANAGEMENT INC. - 3,392 BMO FINANCIAL CORP. - 1,882 BMO BANK N.A. - 1,273 BMO FAMILY OFFICE, LLC - 609 1001271606 ONTARIO INC - 3,129,915 Burgundy Asset Management, Inc. - 3,129,915
	(iv) Shared power to dispose or to direct the disposition of: Bank of Montreal - 0 BANK OF MONTREAL HOLDING INC. - 0 BMO NESBITT BURNS INC. - 0 BMO ASSET MANAGEMENT INC. - 0 BMO FINANCIAL CORP. - 0 BMO BANK N.A. - 0 BMO FAMILY OFFICE, LLC - 0 1001271606 ONTARIO INC - 0 Burgundy Asset Management, Inc. - 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.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Documents.
Item 8.	Identification and Classification of Members of the Group.
	If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group. Each reporting person may be deemed to be a member of a group with respect to the issuer or securities of the issuer for the purposes of Section 13(d) or 13(g) of the Act. Each reporting person declares that neither the filing of this statement nor anything herein shall be construed as an admission that such person is, for the purposes of Section13(d) or 13(g) of the Act or any other purpose, (i) acting (or has agreed or is agreeing to act) with any other person as a partnership, limited partnership, syndicate, or other group for the purpose of acquiring, holding, or disposing of securities of the issuer or otherwise with respect to the issuer or any securities of the issuer or (ii) a member of any syndicate or group with respect to the issuer or any securities of the issuer.
Item 9.	Notice of Dissolution of Group.
	Notice of dissolution of a group may be furnished as an exhibit stating the date of the dissolution and that all further filings with respect to transactions in the security reported on will be filed, if required, by members of the group, in their individual capacity. See Item 5. Each reporting person may be deemed to be a member of a group with respect to the issuer or securities of the issuer for the purposes of Section 13(d) or 13(g) of the Act. Each reporting person declares that neither the filing of this statement nor anything herein shall be construed as an admission that such person is, for the purposes of Section13(d) or 13(g) of the Act or any other purpose, (i) acting (or has agreed or is agreeing to act) with any other person as a partnership, limited partnership, syndicate, or other group for the purpose of acquiring, holding, or disposing of securities of the issuer or otherwise with respect to the issuer or any securities of the issuer or (ii) a member of any syndicate or group with respect to the issuer or any securities of the issuer.

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.

Bank of Montreal

Signature:	Kathryn Cenac
Name/Title:	Managing Director - Regulatory Solutions Group
Date:	08/12/2026

BANK OF MONTREAL HOLDING INC.

Signature:	Kathryn Cenac
Name/Title:	Managing Director - Regulatory Solutions Group
Date:	08/12/2026

BMO NESBITT BURNS INC.

Signature:	Kathryn Cenac
Name/Title:	Managing Director - Regulatory Solutions Group
Date:	08/12/2026

BMO ASSET MANAGEMENT INC.

Signature:	Kathryn Cenac
Name/Title:	Managing Director - Regulatory Solutions Group
Date:	08/12/2026

BMO FINANCIAL CORP.

Signature:	Kathryn Cenac
Name/Title:	Managing Director - Regulatory Solutions Group
Date:	08/12/2026

BMO BANK N.A.

Signature:	Kathryn Cenac
Name/Title:	Managing Director - Regulatory Solutions Group
Date:	08/12/2026

BMO FAMILY OFFICE, LLC

Signature:	Kathryn Cenac
Name/Title:	Managing Director - Regulatory Solutions Group
Date:	08/12/2026

1001271606 ONTARIO INC

Signature:	Kathryn Cenac
Name/Title:	Managing Director - Regulatory Solutions Group
Date:	08/12/2026

Burgundy Asset Management, Inc.

Signature:	Kathryn Cenac
Name/Title:	Managing Director - Regulatory Solutions Group
Date:	08/12/2026