Feeds › Ownership stakes (13D / 13G)
Ownership stakes (13D / 13G)
Investors who own more than 5% of a company, from activists (13D) to passive holders (13G).
About this data
- What it is
- An investor who owns more than 5% of a public company must say so. Investors who may try to influence the company, such as activists, file the longer Schedule 13D; passive holders file the shorter Schedule 13G.
- Who files it
- The investor, within days of crossing 5%, and again whenever the stake changes materially.
- How current
- We collect new filings throughout the day on SEC business days.
- Worth knowing
- 13G filings are far more common than 13D. A 13D usually means the investor intends to push for changes, so it tends to get more attention.
All of this comes from public filings.
Source and freshness · Information, not investment advice (disclaimer).
Filings per day, last 30 days
13D (activist) 13G (passive)
Latest ownership filings
Showing: ticker ALRM
| Filed | ScheduleBoth report a stake of more than 5%. A 13D is filed by investors who may try to influence the company, such as activists; a 13G by passive holders. | Company | Investor | Shares | % of shares | Filing |
|---|---|---|---|---|---|---|
| Aug 14, 2026 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Disciplined Growth Investors Inc /MN | 3.59M | 7.3% | SCHEDULE 13G/A ↗ |
| Aug 12, 2026 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Burgundy Asset Management, Inc. | 3.13M | 6.3% | SCHEDULE 13G/A ↗ |
| Aug 12, 2026 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | 1001271606 Ontario Inc | 3.13M | 6.3% | SCHEDULE 13G/A ↗ |
| Aug 12, 2026 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Bmo Family Office, LLC | 609 | 0.0% | SCHEDULE 13G/A ↗ |
| Aug 12, 2026 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Bmo Bank N.A. | 1,273 | 0.0% | SCHEDULE 13G/A ↗ |
| Aug 12, 2026 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Bmo Financial Corp. | 1,882 | 0.0% | SCHEDULE 13G/A ↗ |
| Aug 12, 2026 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Bmo Asset Management Inc. | 3,392 | 0.0% | SCHEDULE 13G/A ↗ |
| Aug 12, 2026 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Bmo Nesbitt Burns Inc. | 3,409 | 0.0% | SCHEDULE 13G/A ↗ |
| Aug 12, 2026 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Bank of Montreal Holding Inc. | 3,409 | 0.0% | SCHEDULE 13G/A ↗ |
| Aug 12, 2026 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Bank of Montreal | 3.46M | 7.0% | SCHEDULE 13G/A ↗ |
| May 15, 2026 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Disciplined Growth Investors Inc /MN | 3.27M | 6.6% | SCHEDULE 13G/A ↗ |
| May 13, 2026 | SCHEDULE 13G | ALRM Alarm.com Holdings, Inc. | Burgundy Asset Management, Inc. | 2.40M | 4.8% | SCHEDULE 13G ↗ |
| May 13, 2026 | SCHEDULE 13G | ALRM Alarm.com Holdings, Inc. | 1001271606 Ontario Inc | 2.40M | 4.8% | SCHEDULE 13G ↗ |
| May 13, 2026 | SCHEDULE 13G | ALRM Alarm.com Holdings, Inc. | Bmo Family Office, LLC | 409 | 0.0% | SCHEDULE 13G ↗ |
| May 13, 2026 | SCHEDULE 13G | ALRM Alarm.com Holdings, Inc. | Bmo Bank N.A. | 1,437 | 0.0% | SCHEDULE 13G ↗ |
| May 13, 2026 | SCHEDULE 13G | ALRM Alarm.com Holdings, Inc. | Bmo Financial Corp. | 19,846 | 0.0% | SCHEDULE 13G ↗ |
| May 13, 2026 | SCHEDULE 13G | ALRM Alarm.com Holdings, Inc. | Bmo Nesbitt Burns Inc. | 24 | 0.0% | SCHEDULE 13G ↗ |
| May 13, 2026 | SCHEDULE 13G | ALRM Alarm.com Holdings, Inc. | Bmo Asset Management Inc. | 3,051 | 0.0% | SCHEDULE 13G ↗ |
| May 13, 2026 | SCHEDULE 13G | ALRM Alarm.com Holdings, Inc. | Bmo Nesbitt Burns Inc. Wealth Management | 3,053 | 0.0% | SCHEDULE 13G ↗ |
| May 13, 2026 | SCHEDULE 13G | ALRM Alarm.com Holdings, Inc. | Bank of Montreal Holding Inc. | 3,077 | 0.0% | SCHEDULE 13G ↗ |
| May 13, 2026 | SCHEDULE 13G | ALRM Alarm.com Holdings, Inc. | Bank of Montreal | 2.68M | 5.4% | SCHEDULE 13G ↗ |
| Apr 29, 2026 | SCHEDULE 13G | ALRM Alarm.com Holdings, Inc. | Vanguard Capital Management | 2.53M | 5.1% | SCHEDULE 13G ↗ |
| Apr 28, 2026 | SCHEDULE 13G | ALRM Alarm.com Holdings, Inc. | Vanguard Portfolio Management | 4.00M | 8.0% | SCHEDULE 13G ↗ |
| Mar 26, 2026 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | The Vanguard Group | 0 | 0.0% | SCHEDULE 13G/A ↗ |
| Feb 17, 2026 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Disciplined Growth Investors Inc /MN | 3.42M | 6.9% | SCHEDULE 13G/A ↗ |
| Nov 14, 2025 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Disciplined Growth Investors Inc /MN | 3.33M | 6.7% | SCHEDULE 13G/A ↗ |
| Aug 14, 2025 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Disciplined Growth Investors Inc /MN | 3.49M | 7.0% | SCHEDULE 13G/A ↗ |
| May 15, 2025 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Brown Capital Management, LLC | 2.39M | 4.8% | SCHEDULE 13G/A ↗ |
| May 15, 2025 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Disciplined Growth Investors Inc /MN | 3.39M | 6.8% | SCHEDULE 13G/A ↗ |
| Apr 29, 2025 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | BlackRock, Inc. | 8.34M | 16.8% | SCHEDULE 13G/A ↗ |
| Feb 14, 2025 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Brown Capital Management, LLC | 2.39M | 4.8% | SCHEDULE 13G/A ↗ |
| Feb 14, 2025 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | Disciplined Growth Investors Inc /MN | 2.94M | 6.0% | SCHEDULE 13G/A ↗ |
| Feb 5, 2025 | SCHEDULE 13G/A (amended) | ALRM Alarm.com Holdings, Inc. | BlackRock, Inc. | 9.32M | 18.9% | SCHEDULE 13G/A ↗ |
33 items, most recent first (up to 50). Every row links to its original filing. Updated Nov 15, 2026, 6:34 PM EST.
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