As of November 6, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of BlackLine Inc. The largest reported stake is BlackRock, Inc.'s, at 12.6%. 5 filings are on record since July 17, 2025 (Schedule 13G/A, July 17, 2025).
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Key facts
- · Holder: Vanguard Portfolio Management · Percent: 6.88% · SCHEDULE 13G
- · Holder: The Vanguard Group · Percent: 0% · SCHEDULE 13G/A
- · Holder: Fivespan Partners, LP · Percent: 5.1% · SCHEDULE 13D
- · Holder: Fmr LLC · Percent: 4.3% · SCHEDULE 13G/A
- · Holder: BlackRock, Inc. · Percent: 12.6% · SCHEDULE 13G/A
BlackLine Inc has 5 Schedule 13D or 13G filings on record since 2025-07-17. 3 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 |
|---|---|---|---|---|
| BlackRock, Inc. | 12.6% | 7,849,789 | SCHEDULE 13G/A, 2025-07-17 | 2025-06-30 |
| Vanguard Portfolio Management | 6.88% | 4,106,074 | SCHEDULE 13G, 2026-04-29 | 2026-03-31 |
| Fivespan Partners, LP | 5.1% | 3,013,943 | SCHEDULE 13D, 2026-03-12 | 2026-03-11 |
| Fmr LLC | 4.3% | 2,688,553 | SCHEDULE 13G/A, 2025-08-06 | 2025-06-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
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More on BlackLine Inc and the records around it.
BlackLine Inc elsewhere on the record
Companies that share a holder
- Fivespan Partners, LP also filed stake reports on 1 other company: APPIAN CORP (Feb 2026)
- FMR LLC also filed stake reports on 761 other companies: ASPEN NEUROSCIENCE INC (Nov 2026), AVALO THERAPEUTICS INC (Nov 2026), BRAZE INC (Nov 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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Purpose of Transaction (Item 4)
Fivespan Partners, LP
The Reporting Persons acquired the securities of the Issuer reported herein based on their belief that the securities were undervalued and represented an attractive investment opportunity. The Reporting Persons from time to time expect to enter into discussions with directors and officers of the Issuer in connection with the Reporting Persons' investment in the Issuer. Such discussions may include, without limitation, a range of issues, including those relating to the business of the Issuer, management, board composition (which may include whether it makes sense for a Fivespan employee to be on the Issuer's board of directors), investor communications, management, operations, business, assets, capital allocation, dividend policy, financial condition, mergers and acquisitions strategy, overall business strategy, executive compensation and corporate governance. The Reporting Persons may also have similar conversations with other stockholders or other interested parties, such as industry analysts, existing or potential strategic partners or competitors, investment professionals, and other current or prospective investors. The Reporting Persons may exchange information with any such persons pursuant to, when deemed appropriate, confidentiality or similar agreements which may contain customary standstill provisions. The Reporting Persons intend to review their respective investments in the Issuer on a continuing basis and may from time to time and at any time in the future, …The first part of Item 4 of the SCHEDULE 13D filed 2026-03-12; the filing has the rest
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-17 | BlackRock, Inc. | 12.6% | SCHEDULE 13G/A |
| 2025-08-06 | Fmr LLC | 4.3% | SCHEDULE 13G/A |
| 2026-03-12 | Fivespan Partners, LP | 5.1% | SCHEDULE 13D |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-29 | Vanguard Portfolio Management | 6.88% | SCHEDULE 13G |
Questions about who owns BlackLine Inc
Who owns BlackLine Inc?
On this page, 3 holders' latest ownership filings report 5% or more of BlackLine Inc: BlackRock, Inc. (12.6%, Schedule 13G/A, filed 2025-07-17), Vanguard Portfolio Management (6.88%, Schedule 13G, filed 2026-04-29) and Fivespan Partners, LP (5.1%, Schedule 13D, filed 2026-03-12).
Who are the largest shareholders of BlackLine Inc?
By the share each holder's latest filing reports, the largest holders of BlackLine Inc on this page are BlackRock, Inc. (12.6%), Vanguard Portfolio Management (6.88%) and Fivespan Partners, LP (5.1%).
When did BlackRock, Inc. buy into BlackLine Inc?
The filings give report dates, not purchase dates. The earliest filing from BlackRock, Inc. on this page is the Schedule 13G/A, filed 2025-07-17, reporting 12.6%. That earliest filing is itself an amendment, which updates an earlier report.
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%); 5 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.