Comparable stake leader
WELLINGTON MANAGEMENT GROUP LLP
SEC ownership of Amplitude, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001866692.
Disclosed value leader
SC US (TTGP), LTD.
Comparable rows
50/50
Latest evidence
17 Aug 2026
- Public ticker
- AMPL on Nasdaq
- Parsed ownership sources
-
13F, 13D/G, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
WELLINGTON MANAGEMENT GROUP LLP
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
WELLINGTON MANAGEMENT GROUP LLP
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
17 Aug 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001866692
- Issuer location
- San Francisco, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Amplitude, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
WELLINGTON MANAGEMENT GRO...
Disclosed value leader
SC US (TTGP), LTD.
Comparable rows
50/50
Latest evidence
17 Aug 2026
13F
13D/G
3/4/5
Lead comparable stake: 11%
13D/G row: WELLINGTON MANAGEMENT GROUP LLP
Showing 1-8 of 50 holder rows.
Quick read
WELLINGTON MANAGEMENT GROUP LLP leads the comparable SEC ownership view at 11%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens WELLINGTON MANAGEMENT GROUP LLP's linked filing trail.
Comparable ownership
Top 5
WELLINGTON MANAGEMENT GROUP LLP
11%
SC US (TTGP), LTD.
9.9%
BlackRock, Inc.
7.6%
VANGUARD PORTFOLIO MANAGEMENT LLC
6%
FMR LLC
5.8%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| WELLINGTON MANAGEMENT GROUP LLP |
13F
13D/G
Company
|
11%
from 13D/G
|
$84,807,946
11,086,006 shares
|
— | 30 Jun 2026 |
| SC US (TTGP), LTD. |
13D/G
3/4/5
13F
SC US (TTGP), LTD. ("SC US (TTGP)") · 10%+ Owner · Company
|
9.9%
|
$90,681,044
10,223,342 shares
|
$0 | 20 Feb 2025 |
| BlackRock, Inc. |
13F
13D/G
Company
|
7.6%
from 13D/G
|
$76,842,565
10,044,780 shares
|
— | 30 Jun 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
13D/G
Company · Vanguard Portfolio Management
|
6%
from 13D/G
|
$46,542,133
6,083,939 shares
|
— | 30 Jun 2026 |
| FMR LLC |
13D/G
13F
Company
|
5.8%
|
$54,891,227
5,979,436 shares
|
+$24,702,976 | 30 Jun 2026 |
| GIC Private Ltd |
13D/G
|
4.8%
|
$63,317,845
4,977,818 shares
|
$0 | 30 Jun 2025 |
| Battery Ventures XI-A, L.P. |
13D/G
Neeraj Agrawal
|
4.7%
|
$41,385,513
4,665,785 shares
|
$0 | 31 Mar 2025 |
| ALLIANCEBERNSTEIN L.P. |
13D/G
13F
Company
|
0.3%
|
$2,131,217
317,618 shares
|
-$38,299,150 | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$5,915,793.
Buys
$299,790
Insiders: 1
Sells
$6,215,583
Insiders: 4
Net
-$5,915,793
Shares: -563,930
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 30,000
Shares: 593,930
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 30,239 | $0 | $233,458 | -$233,458 |
| 3-6 | 0 | 80,848 | $0 | $649,257 | -$649,257 |
| 6-9 | 0 | 52,843 | $0 | $623,391 | -$623,391 |
| 9-12 | 30,000 | 430,000 | $299,790 | $4,709,477 | -$4,409,687 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 44 reporting-owner rows connected to Amplitude, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
44
Largest Forms 3/4/5 holder
Battery Management Corp.
Net 12M change
-$5,915,793
Latest report
17 Aug 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Battery Management Corp. | 10%+ Owner | $128,515,578 | Mixed | 09 May 2022 | ||
| Dharmesh Thakker | 10%+ Owner | $112,847,040 | Mixed | 05 Jul 2023 | ||
| Neeraj Agrawal | 10%+ Owner | $112,786,514 | Mixed | 02 Jan 2024 | ||
| Battery Ventures Select Fund I, L.P. | 10%+ Owner | $112,786,514 | Mixed | 02 Jan 2024 | ||
| Battery Partners XI, LLC | 10%+ Owner | $107,863,082 | Mixed | 21 Mar 2023 | ||
| Steven M. Spurlock | 10%+ Owner | $97,032,404 | Mixed | 12 Nov 2021 | ||
| SC US (TTGP), LTD. | 10%+ Owner | $90,093,258 | Mixed | 06 Jun 2023 | ||
| Spenser Skates | CEO and President, Director, 10%+ Owner | $67,743,408 | -$4,909,953 | -6.8% | Mixed | 17 Aug 2026 |
| An-Yen Hu | 10%+ Owner | $65,186,539 | Mixed | 30 Nov 2022 | ||
| Benchmark Capital Management Co. VIII, L.L.C. | 10%+ Owner | $65,057,359 | Mixed | 30 Nov 2022 | ||
| Jesse R. Feldman | 10%+ Owner | $32,643,264 | Mixed | 19 Nov 2021 | ||
| Eric Vishria | Director | $23,785,229 | Mixed | 12 Jun 2025 | ||
| Patrick W. Grady | Director, 10%+ Owner | $19,674,040 | Mixed | 09 Jun 2026 | ||
| Nathaniel Glenn Crook | Chief Commercial Officer | $14,708,624 | Median | 17 Aug 2026 | ||
| Scott R. Tobin | 10%+ Owner | $13,815,360 | Mixed | 13 Dec 2021 | ||
| Thomas Neergaard Hansen | President | $11,702,657 | Mixed | 15 Feb 2026 | ||
| Andrew Casey | Chief Financial Officer | $10,429,535 | +$299,790 | +3% | Median | 17 Aug 2026 |
| Hoang Vuong | Chief Financial Officer | $10,227,282 | Mixed | 29 Dec 2022 | ||
| Christopher Harms | Chief Financial Officer | $7,913,265 | Mixed | 15 May 2024 | ||
| Curtis Liu | Chief Technology Officer, Director, 10%+ Owner | $7,269,917 | -$832,135 | -10% | Median | 17 Aug 2026 |
Recent insider transactions for Amplitude, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Curtis Liu | AMPL | Class A Common Stock | Tax liability | -5.37% | -53,878 | 950,316 | 17 Aug 2026 | Direct | ||
| Spenser Skates | AMPL | Class A Common Stock | Tax liability | -4.08% | -52,369 | 1,231,188 | 17 Aug 2026 | Direct | ||
| Nathaniel Glenn Crook | AMPL | Class A Common Stock | Tax liability | -5.38% | -109,368 | 1,922,696 | 17 Aug 2026 | Direct | ||
| Andrew Casey | AMPL | Class A Common Stock | Tax liability | -5.07% | -72,814 | 1,363,338 | 17 Aug 2026 | Direct | ||
| Curtis Liu | AMPL | Class B Common Stock | Gift | 175,000 | 175,000 | 08 Jul 2026 | By Spouse | |||
| Curtis Liu | AMPL | Class B Common Stock | Gift | -2.37% | -175,000 | 7,207,208 | 08 Jul 2026 | By Trust | ||
| Tien Tzuo | AMPL | Class A Common Stock | Award | 1.52% | 1,521 | 101,601 | 05 Jul 2026 | Direct | ||
| Erica Schultz | AMPL | Class A Common Stock | Award | 1.17% | 1,659 | 143,100 | 05 Jul 2026 | Direct | ||
| Catherine Wong | AMPL | Class A Common Stock | Sale | -6.27% | $50,580 | $6.79 | -7,453 | 111,462 | 12 Jun 2026 | Direct |
| James M. Whitehurst | AMPL | Class A Common Stock | Award | 15.3% | 24,857 | 187,201 | 09 Jun 2026 | Direct | ||
| Catherine Wong | AMPL | Class A Common Stock | Award | 26.4% | 24,857 | 118,915 | 09 Jun 2026 | Direct | ||
| Ronald S. Gill | AMPL | Class A Common Stock | Award | 33.3% | 24,857 | 99,535 | 09 Jun 2026 | Direct | ||
| Erica Schultz | AMPL | Class A Common Stock | Award | 21.3% | 24,857 | 141,441 | 09 Jun 2026 | Direct | ||
| Patrick W. Grady | AMPL | Class A Common Stock | Award | 40.8% | 24,857 | 85,806 | 09 Jun 2026 | Direct | ||
| Curtis Liu | AMPL | Class A Common Stock | Sale | -2.22% | $182,878 | $8.03 | -22,786 | 1,004,194 | 01 Jun 2026 | Direct |
| Curtis Liu | AMPL | Class A Common Stock | Tax liability | -3.77% | -40,279 | 1,026,980 | 15 May 2026 | Direct | ||
| Nathaniel Glenn Crook | AMPL | Class A Common Stock | Tax liability | -4.75% | -101,292 | 2,032,064 | 15 May 2026 | Direct | ||
| Andrew Casey | AMPL | Class A Common Stock | Tax liability | -4.32% | -64,872 | 1,436,152 | 15 May 2026 | Direct | ||
| Spenser Skates | AMPL | Class A Common Stock | Tax liability | -2.99% | -39,562 | 1,283,557 | 15 May 2026 | Direct | ||
| Liu Curtis | AMPL | Class A Common Stock | Sale | -1.62% | $142,877 | $8.12 | -17,586 | 1,067,259 | 04 May 2026 | Direct |
| Spenser Skates | AMPL | Class A Common Stock | Award | 1,323,119 | 1,323,119 | 21 Apr 2026 | Direct | |||
| Curtis Liu | AMPL | Class A Common Stock | Award | 62.6% | 417,827 | 1,084,845 | 15 Apr 2026 | Direct | ||
| Nathaniel Glenn Crook | AMPL | Class A Common Stock | Award | 142.8% | 1,253,481 | 2,131,026 | 15 Apr 2026 | Direct | ||
| Andrew Casey | AMPL | Class A Common Stock | Award | 40.5% | 431,754 | 1,498,524 | 15 Apr 2026 | Direct | ||
| Schultz Erica | AMPL | Class A Common Stock | Award | 1.46% | 1,678 | 116,584 | 05 Apr 2026 | Direct | ||
| Tzuo Tien | AMPL | Class A Common Stock | Award | 1.56% | 1,538 | 100,080 | 05 Apr 2026 | Direct | ||
| Liu Curtis | AMPL | Class A Common Stock | Sale | -5.21% | $265,840 | $8.01 | -33,201 | 603,756 | 06 Mar 2026 | Direct |
| Liu Curtis | AMPL | Class A Common Stock | Sale | -4.51% | $240,539 | $8.00 | -30,061 | 636,957 | 05 Mar 2026 | Direct |
| Thomas Neergaard Hansen | AMPL | Class A Common Stock | Tax liability | -3.61% | -69,142 | 1,845,845 | 15 Feb 2026 | Direct | ||
| Liu Curtis | AMPL | Class A Common Stock | Tax liability | -3.52% | -26,672 | 730,280 | 15 Feb 2026 | Direct | ||
| Andrew Casey | AMPL | Class A Common Stock | Tax liability | -3.57% | -39,438 | 1,066,770 | 15 Feb 2026 | Direct | ||
| Tien Tzuo | AMPL | Class A Common Stock | Award | 1.02% | 999 | 98,542 | 05 Jan 2026 | Direct | ||
| Skates Spenser | AMPL | Class A Common Stock | Sale | -100% | $1,200 | $12.00 | -100 | 0 | 26 Dec 2025 | By Spouse |
| Skates Spenser | AMPL | Class A Common Stock | Conversion of derivative security | 100 | 100 | 26 Dec 2025 | By Spouse | |||
| Skates Spenser | AMPL | Class B Common Stock | Conversion of derivative security | -0.02% | -100 | 567,157 | 26 Dec 2025 | By Spouse | ||
| Skates Spenser | AMPL | Class A Common Stock | Sale | -100% | $513,433 | $12.01 | -42,743 | 0 | 24 Dec 2025 | By Spouse |
| Skates Spenser | AMPL | Class A Common Stock | Conversion of derivative security | 42,743 | 42,743 | 24 Dec 2025 | By Spouse | |||
| Skates Spenser | AMPL | Class B Common Stock | Conversion of derivative security | -7.01% | -42,743 | 567,257 | 24 Dec 2025 | By Spouse | ||
| Schultz Erica | AMPL | Class A Common Stock | Sale | -8.01% | $108,758 | $10.88 | -10,000 | 114,906 | 15 Dec 2025 | Direct |
| Schultz Erica | AMPL | Class A Common Stock | Options Exercise | 8.7% | 10,000 | 124,906 | 15 Dec 2025 | Direct | ||
| Schultz Erica | AMPL | Stock Option (Right to Buy) | Options Exercise | -16.8% | -10,000 | 49,500 | 15 Dec 2025 | Direct | ||
| Schultz Erica | AMPL | Class A Common Stock | Sale | -8.52% | $102,295 | $10.23 | -10,000 | 107,406 | 17 Nov 2025 | Direct |
| Schultz Erica | AMPL | Class A Common Stock | Options Exercise | 9.31% | 10,000 | 117,406 | 17 Nov 2025 | Direct | ||
| Schultz Erica | AMPL | Stock Option (Right to Buy) | Options Exercise | -14.4% | -10,000 | 59,500 | 17 Nov 2025 | Direct | ||
| Liu Curtis | AMPL | Class A Common Stock | Tax liability | -4.55% | -36,092 | 756,952 | 15 Nov 2025 | Direct | ||
| Andrew Casey | AMPL | Class A Common Stock | Tax liability | -4.69% | -54,400 | 1,106,208 | 15 Nov 2025 | Direct | ||
| Thomas Neergaard Hansen | AMPL | Class A Common Stock | Tax liability | -4.57% | -91,618 | 1,914,987 | 15 Nov 2025 | Direct | ||
| Skates Spenser | AMPL | Class A Common Stock | Sale | -100% | $4,395,320 | $10.99 | -400,000 | 0 | 11 Nov 2025 | By Spouse |
| Skates Spenser | AMPL | Class A Common Stock | Conversion of derivative security | 400,000 | 400,000 | 11 Nov 2025 | By Spouse | |||
| Skates Spenser | AMPL | Class B Common Stock | Conversion of derivative security | -39.6% | -400,000 | 610,000 | 11 Nov 2025 | By Spouse |
* marks a reported price that did not pass the local price check.