As of November 6, 2026, 4 holders' latest Schedule 13D or 13G filings report owning 5% or more of Alarm.com Holdings, Inc. The largest reported stake is Vanguard Portfolio Management's, at 8.04%. 10 filings are on record since August 14, 2025 (Schedule 13G, April 28, 2026).
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Key facts
- · Reporting person: Disciplined Growth Investors Inc · Sole voting: 3,377,527 · Shared voting: 0 · Sole dispositive: 3,585,614 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-08-14
- · Reporting person: Bank of Montreal · Sole voting: 2,576,689 · Shared voting: 0 · Sole dispositive: 3,455,201 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-08-12
- · Holder: Disciplined Growth Investors Inc · Percent: 6.6% · SCHEDULE 13G/A
- · Holder: Bank of Montreal · Percent: 5.38% · SCHEDULE 13G
- · Holder: Vanguard Capital Management · Percent: 5.09% · SCHEDULE 13G
Alarm.com Holdings, Inc. has 10 Schedule 13D or 13G filings on record since 2025-08-14. 4 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Vanguard Portfolio Management | 8.04% | 3,997,102 | SCHEDULE 13G, 2026-04-28 | 2026-03-31 |
| Disciplined Growth Investors Inc | 7.3% | 3,585,614 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| Bank of Montreal | 6.98% | 3,455,201 | SCHEDULE 13G/A, 2026-08-12 | 2026-06-30 |
| Vanguard Capital Management | 5.09% | 2,530,042 | SCHEDULE 13G, 2026-04-29 | 2026-03-31 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
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More on Alarm.com Holdings, Inc. and the records around it.
Alarm.com Holdings, Inc. elsewhere on the record
Companies that share a holder
- DISCIPLINED GROWTH INVESTORS INC /MN also filed stake reports on 10 other companies: Kornit Digital Ltd. (Aug 2026), Stitch Fix, Inc. (Aug 2026), ZIPRECRUITER, INC. (Aug 2026)
- Bank of Montreal also filed stake reports on 49 other companies: Akari Therapeutics Plc (Aug 2026), North American Construction Group Ltd. (Aug 2026), OPENLANE, Inc. (Aug 2026)
- Vanguard Portfolio Management also filed stake reports on 941 other companies: Newmark Group Inc (Nov 2026), A10 Networks Inc (Oct 2026), ADT Inc (Oct 2026)
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What the Full Report on Alarm.com Holdings, Inc. covers
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Disciplined Growth Investors Inc | 3,377,527 | 0 | 3,585,614 | 0 | SCHEDULE 13G/A, 2026-08-14 |
| Bank of Montreal | 2,576,689 | 0 | 3,455,201 | 0 | SCHEDULE 13G/A, 2026-08-12 |
| Bank Of Montreal Holding Inc. | 3,409 | 0 | 3,409 | 0 | SCHEDULE 13G/A, 2026-08-12 |
| Bmo Nesbitt Burns Inc. | 3,409 | 0 | 3,409 | 0 | SCHEDULE 13G/A, 2026-08-12 |
| Bmo Asset Management Inc. | 3,392 | 0 | 3,392 | 0 | SCHEDULE 13G/A, 2026-08-12 |
| Bmo Financial Corp. | 815 | 0 | 1,882 | 0 | SCHEDULE 13G/A, 2026-08-12 |
| Bmo Bank N.A. | 815 | 0 | 1,273 | 0 | SCHEDULE 13G/A, 2026-08-12 |
| Bmo Family Office, LLC | 0 | 0 | 609 | 0 | SCHEDULE 13G/A, 2026-08-12 |
| 1001271606 Ontario Inc | 2,252,470 | 0 | 3,129,915 | 0 | SCHEDULE 13G/A, 2026-08-12 |
| Burgundy Asset Management, Inc. | 2,252,470 | 0 | 3,129,915 | 0 | SCHEDULE 13G/A, 2026-08-12 |
The latest filing identifies Alarm.com Holdings, Inc. by CUSIP 167519886 and gives its principal executive office as 8281 GREENSBORO DRIVE, TYSONS, VA 22102 (SCHEDULE 13G/A, 2026-08-14).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-14 | Disciplined Growth Investors Inc | 7% | SCHEDULE 13G/A |
| 2025-11-14 | Disciplined Growth Investors Inc | 6.7% | SCHEDULE 13G/A |
| 2026-02-17 | Disciplined Growth Investors Inc | 6.9% | SCHEDULE 13G/A |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-28 | Vanguard Portfolio Management | 8.04% | SCHEDULE 13G |
| 2026-04-29 | Vanguard Capital Management | 5.09% | SCHEDULE 13G |
| 2026-05-13 | Bank of Montreal | 5.38% | SCHEDULE 13G |
| 2026-05-15 | Disciplined Growth Investors Inc | 6.6% | SCHEDULE 13G/A |
| 2026-08-12 | Bank of Montreal | 6.98% | SCHEDULE 13G/A |
| 2026-08-14 | Disciplined Growth Investors Inc | 7.3% | SCHEDULE 13G/A |
Questions about who owns Alarm.com Holdings, Inc.
Who owns Alarm.com Holdings, Inc.?
On this page, 4 holders' latest ownership filings report 5% or more of Alarm.com Holdings, Inc.: Vanguard Portfolio Management (8.04%, Schedule 13G, filed 2026-04-28), Disciplined Growth Investors Inc (7.3%, Schedule 13G/A, filed 2026-08-14), Bank of Montreal (6.98%, Schedule 13G/A, filed 2026-08-12) and Vanguard Capital Management (5.09%, Schedule 13G, filed 2026-04-29).
Who are the largest shareholders of Alarm.com Holdings, Inc.?
By the share each holder's latest filing reports, the largest holders of Alarm.com Holdings, Inc. on this page are Vanguard Portfolio Management (8.04%), Disciplined Growth Investors Inc (7.3%) and Bank of Montreal (6.98%).
When did Vanguard Portfolio Management buy into Alarm.com Holdings, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Vanguard Portfolio Management on this page is the Schedule 13G, filed 2026-04-28, reporting 8.04%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 10 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.