Amplitude Inc has 13 Schedule 13D or 13G filings on record since 2025-08-06. 4 holders' latest filing reports 5% or more of class a common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Wellington Management Group LLP | 10.7% | 11,154,556 | SCHEDULE 13G, 2026-04-07 | 2026-03-31 |
| BlackRock, Inc. | 7.6% | 7,935,962 | SCHEDULE 13G/A, 2026-07-27 | 2026-06-30 |
| Vanguard Portfolio Management | 6% | 6,250,377 | SCHEDULE 13G, 2026-04-28 | 2026-03-31 |
| Fmr LLC | 5.8% | 5,979,436 | SCHEDULE 13G, 2026-08-06 | 2026-06-30 |
| GIC Private Ltd | 4.8% | 4,977,818 | SCHEDULE 13G/A, 2025-08-11 | 2025-06-30 |
| AllianceBernstein L.P. | 0.3% | 317,618 | SCHEDULE 13G/A, 2026-05-18 | 2026-03-31 |
| T. Rowe Price Investment Management, Inc. | 0% | 441 | SCHEDULE 13G/A, 2026-02-17 | 2025-12-31 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-06 | Fmr LLC | 3.3% | SCHEDULE 13G/A |
| 2025-08-11 | GIC Private Ltd | 4.8% | SCHEDULE 13G/A |
| 2025-11-14 | AllianceBernstein L.P. | 5.9% | SCHEDULE 13G |
| 2025-11-14 | T. Rowe Price Investment Management, Inc. | 5% | SCHEDULE 13G/A |
| 2026-01-07 | The Vanguard Group | 10.44% | SCHEDULE 13G/A |
| 2026-02-17 | T. Rowe Price Investment Management, Inc. | 0% | SCHEDULE 13G/A |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-07 | Wellington Management Group LLP | 10.7% | SCHEDULE 13G |
| 2026-04-07 | Wellington Management Group LLP | 10.7% | SCHEDULE 13G |
| 2026-04-28 | Vanguard Portfolio Management | 6% | SCHEDULE 13G |
| 2026-05-18 | AllianceBernstein L.P. | 0.3% | SCHEDULE 13G/A |
| 2026-07-27 | BlackRock, Inc. | 7.6% | SCHEDULE 13G/A |
| 2026-08-06 | Fmr LLC | 5.8% | SCHEDULE 13G |
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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.