AMPL US Equity

Amplitude, Inc.

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Information Technology · Services-Prepackaged Software · CIK 1866692 · FYE 1231

$8.74

+0.07 (+0.81%)

USD · as of 2026-07-28 · marketstack

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Institutional ownership· 13F filers holding AMPL · 2026-Q1 methodology → sources →

216 holders

% of shares outstanding held

63.2%

Shares held (13F)

83,357,202

Reporting holders

216

Top holders

largest 100 of 216 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	WELLINGTON MANAGEMENT GROUP LLP	11,154,55611.2M	$76M	8.45%	ADD 468%
2	BlackRock, Inc.	10,162,13810.2M	$69M	7.70%	ADD 4%
3	VANGUARD PORTFOLIO MANAGEMENT LLC	6,165,0916.2M	$42M	4.67%	NEW†
4	VANGUARD CAPITAL MANAGEMENT LLC	4,091,3204.1M	$28M	3.10%	NEW†
5	FMR LLC	3,311,2843.3M	$23M	2.51%	ADD 642%
6	SC US (TTGP), LTD.	2,798,9512.8M	$19M	2.12%	—
7	BAILLIE GIFFORD & CO	2,634,1502.6M	$18M	2.00%	TRIM -4%
8	Nuveen, LLC	2,554,7742.6M	$17M	1.94%	TRIM -3%
9	STATE STREET CORP	2,429,3072.4M	$17M	1.84%	ADD 5%
10	Point72 Asset Management, L.P.	2,411,3002.4M	$16M	1.83%	TRIM -31%
11	GEODE CAPITAL MANAGEMENT, LLC	2,326,1072.3M	$16M	1.76%	ADD 4%
12	MILLENNIUM MANAGEMENT LLC	2,031,8232.0M	$14M	1.54%	TRIM -10%
13	JACOBS LEVY EQUITY MANAGEMENT, INC	1,731,4371.7M	$12M	1.31%	ADD 2881%
14	Optimus Prime Fund Management Co., Ltd.	1,580,1001.6M	$11M	1.20%	—
15	MONIMUS CAPITAL MANAGEMENT, LP	1,264,2861.3M	$9M	0.96%	ADD 240%
16	ArrowMark Colorado Holdings LLC	1,256,0231.3M	$9M	0.95%	TRIM -15%
17	AQR CAPITAL MANAGEMENT LLC	1,235,0281.2M	$8M	0.94%	ADD 46%
18	Meros Investment Management, LP	1,163,8261.2M	$8M	0.88%	ADD 35%
19	GAGNON SECURITIES LLC	1,059,8361.1M	$7M	0.80%	ADD 52%
20	MORGAN STANLEY	920,506920,506	$6M	0.70%	ADD 34%
21	NORTHERN TRUST CORP	868,529868,529	$6M	0.66%	ADD 6%
22	ACADIAN ASSET MANAGEMENT LLC	800,030800,030	$5M	0.61%	ADD 51%
23	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	733,701733,701	$5M	0.56%	TRIM -6%
24	Squarepoint Ops LLC	712,395712,395	$5M	0.54%	TRIM -26%
25	TWO SIGMA INVESTMENTS, LP	691,661691,661	$5M	0.52%	TRIM -34%
26	VANGUARD FIDUCIARY TRUST CO	660,804660,804	$5M	0.50%	NEW
27	Gagnon Advisors, LLC	634,987634,987	$4M	0.48%	ADD 39%
28	DIMENSIONAL FUND ADVISORS LP	617,713617,713	$4M	0.47%	ADD 368%
29	GOLDMAN SACHS GROUP INC	598,270598,270	$4M	0.45%	TRIM -51%
30	Qube Research & Technologies Ltd	597,441597,441	$4M	0.45%	NEW
31	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	576,301576,301	$4M	0.44%	NEW
32	BANK OF AMERICA CORP /DE/	556,052556,052	$4M	0.42%	TRIM -16%
33	ALLIANCEBERNSTEIN L.P.	317,618317,618	$4M	0.24%	TRIM -95%
34	WESTERLY CAPITAL MANAGEMENT, LLC	500,000500,000	$3M	0.38%	—
35	Man Group plc	478,338478,338	$3M	0.36%	ADD 245%
36	Cerity Partners LLC	462,790462,790	$3M	0.35%	—
37	Y-Intercept (Hong Kong) Ltd	454,143454,143	$3M	0.34%	NEW
38	FIRST TRUST ADVISORS LP	424,566424,566	$3M	0.32%	ADD 363%
39	Trigran Investments, Inc.	380,526380,526	$3M	0.29%	NEW
40	Quantinno Capital Management LP	370,515370,515	$3M	0.28%	ADD 1684%
41	Portolan Capital Management, LLC	359,593359,593	$2M	0.27%	TRIM -36%
42	MERCER GLOBAL ADVISORS INC /ADV	329,425329,425	$2M	0.25%	ADD 134%
43	JPMORGAN CHASE & CO	328,940328,940	$2M	0.25%	ADD 59%
44	VOYA INVESTMENT MANAGEMENT LLC	321,657321,657	$2M	0.24%	TRIM -10%
45	Toronado Partners, LLC	318,823318,823	$2M	0.24%	TRIM -59%
46	Madison Asset Management, LLC	314,060314,060	$2M	0.24%	ADD 303%
47	LIGHT STREET CAPITAL MANAGEMENT, LLC	292,844292,844	$2M	0.22%	TRIM -80%
48	G2 Investment Partners Management LLC	270,000270,000	$2M	0.20%	TRIM -5%
49	Verition Fund Management LLC	268,119268,119	$2M	0.20%	ADD 236%
50	Trexquant Investment LP	266,143266,143	$2M	0.20%	TRIM -40%
51	Bank of New York Mellon Corp	262,530262,530	$2M	0.20%	—
52	Circumference Group LLC	238,000238,000	$2M	0.18%	—
53	Swiss National Bank	181,200181,200	$1M	0.14%	—
54	Creative Planning	180,002180,002	$1M	0.14%	ADD 156%
55	MARATHON CAPITAL MANAGEMENT	171,560171,560	$1M	0.13%	ADD 94%
56	Savant Capital, LLC	167,561167,561	$1M	0.13%	—
57	IEQ CAPITAL, LLC	164,576164,576	$1M	0.12%	ADD 7%
58	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	163,946163,946	$1M	0.12%	ADD 3%
59	HSBC HOLDINGS PLC	159,275159,275	$1M	0.12%	TRIM -44%
60	DEUTSCHE BANK AG\	161,360161,360	$1M	0.12%	TRIM -56%
61	ALGERT GLOBAL LLC	157,820157,820	$1M	0.12%	TRIM -51%
62	BOOTHBAY FUND MANAGEMENT, LLC	154,389154,389	$1M	0.12%	ADD 113%
63	S SQUARED TECHNOLOGY, LLC	150,402150,402	$1M	0.11%	NEW
64	Invesco Ltd.	135,201135,201	$922,071	0.10%	ADD 19%
65	Russell Investments Group, Ltd.	131,640131,640	$897,661	0.10%	ADD 73%
66	SUSQUEHANNA INTERNATIONAL GROUP, LLP	123,694123,694	$843,593	0.09%	TRIM -43%
67	UBS Group AG	122,024122,024	$832,204	0.09%	TRIM -78%
68	PRICE T ROWE ASSOCIATES INC /MD/	120,038120,038	$819,000	0.09%	TRIM -2%
69	SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC	118,919118,919	$811,028	0.09%	TRIM -46%
70	Connor, Clark & Lunn Investment Management Ltd.	114,402114,402	$780,222	0.09%	TRIM -43%
71	RHUMBLINE ADVISERS	113,453113,453	$773,741	0.09%	ADD 3%
72	Utah Retirement Systems	112,795112,795	$769,262	0.09%	—
73	UNITED CAPITAL FINANCIAL ADVISORS, LLC	110,599110,599	$754,285	0.08%	—
74	CANADA PENSION PLAN INVESTMENT BOARD	102,900102,900	$701,778	0.08%	TRIM -11%
75	SEI INVESTMENTS CO	100,035100,035	$682,245	0.08%	TRIM -3%
76	WILSON ASSET MANAGEMENT (INTERNATIONAL) PTY LTD	99,05399,053	$675,541	0.08%	—
77	Walleye Capital LLC	90,26290,262	$615,587	0.07%	TRIM -79%
78	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	87,95187,951	$599,826	0.07%	—
79	NANO CAP NEW MILLENNIUM GROWTH FUND L P	60,00060,000	$596,750	0.05%	—
80	BNP PARIBAS FINANCIAL MARKETS	85,99885,998	$586,506	0.07%	ADD 19%
81	Inspire Investing, LLC	74,73174,731	$509,665	0.06%	ADD 85%
82	Legal & General Group Plc	74,34874,348	$507,053	0.06%	TRIM -15%
83	PDT Partners, LLC	66,96466,964	$456,694	0.05%	TRIM -44%
84	Palogic Value Management, L.P.	65,00065,000	$443,300	0.05%	NEW
85	CWM, LLC	62,80862,808	$428,351	0.05%	ADD 40%
86	DRW Securities, LLC	59,66959,669	$406,942	0.05%	NEW
87	VANGUARD ASSET MANAGEMENT, Ltd	59,36259,362	$404,849	0.04%	NEW
88	Cresset Asset Management, LLC	55,68455,684	$379,765	0.04%	—
89	Zurcher Kantonalbank (Zurich Cantonalbank)	53,44153,441	$364,468	0.04%	—
90	MetLife Investment Management, LLC	52,66352,663	$359,162	0.04%	ADD 3%
91	STRS OHIO	51,80051,800	$353,276	0.04%	—
92	STATE OF WISCONSIN INVESTMENT BOARD	49,68449,684	$338,845	0.04%	ADD 123%
93	RENAISSANCE TECHNOLOGIES LLC	47,03147,031	$320,751	0.04%	TRIM -42%
94	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	46,08946,089	$314,327	0.03%	ADD 8%
95	Brevan Howard Capital Management LP	45,53845,538	$310,569	0.03%	ADD 221%
96	SG Americas Securities, LLC	44,52144,521	$304,000	0.03%	TRIM -31%
97	Allspring Global Investments Holdings, LLC	43,30643,306	$294,047	0.03%	TRIM -32%
98	PRELUDE CAPITAL MANAGEMENT, LLC	43,06443,064	$293,696	0.03%	NEW
99	CenterBook Partners LP	40,90840,908	$278,993	0.03%	NEW
100	Blue Trust, Inc.	40,20440,204	$274,191	0.03%	ADD 16%

† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.

Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.

Holder trends· top 15 holders · shares held over 6 quarters

green added · red trimmed

Holder

2024-Q4

2025-Q1

2025-Q2

2025-Q3

2025-Q4

2026-Q1

Latest value

WELLINGTON MANAGEMENT GROUP LLP

—

229K

2.0M

11.2M

$76M

BlackRock, Inc.

6.2M

6.5M

8.5M

9.6M

9.8M

10.2M

$69M

VANGUARD PORTFOLIO MANAGEMENT LLC

—

6.2M

$42M

VANGUARD CAPITAL MANAGEMENT LLC

—

4.1M

$28M

FMR LLC

8.4M

7.3M

3.3M

865K

446K

3.3M

$23M

SC US (TTGP), LTD.

2.8M

$19M

BAILLIE GIFFORD & CO

—

2.0M

2.7M

2.6M

$18M

Nuveen, LLC

—

248K

2.0M

2.2M

2.6M

$17M

STATE STREET CORP

2.0M

2.1M

2.2M

2.3M

2.4M

$17M

Point72 Asset Management, L.P.

410K

344K

1.2M

1.3M

3.5M

2.4M

$16M

GEODE CAPITAL MANAGEMENT, LLC

2.0M

2.2M

2.3M

$16M

MILLENNIUM MANAGEMENT LLC

14K

210K

1.9M

2.1M

2.3M

2.0M

$14M

JACOBS LEVY EQUITY MANAGEMENT, INC

111K

107K

51K

38K

58K

1.7M

$12M

Optimus Prime Fund Management Co., Ltd.

1.6M

$11M

MONIMUS CAPITAL MANAGEMENT, LP

344K

255K

250K

286K

371K

1.3M

$9M

Shares reported each quarter by the largest current holders. Green = added vs the prior filing, red = trimmed, grey = roughly held; a dash is a quarter with no 13F on file (a gap is skipped, not read as an exit). 13F is filed up to 45 days after quarter-end. Up to 40 quarters (10 years) available — use the selector above.

Institutional footprint by quarter

Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding uses today's share count for every quarter (the only count stored).

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	216	83,357,202	63.2%	$570M
2025-Q4	210	80,519,803	61.0%	$932M
2025-Q3	203	78,366,388	59.4%	$840M
2025-Q2	188	77,823,461	59.0%	$965M
2025-Q1	195	72,474,194	54.9%	$739M
2024-Q4	147	70,103,176	53.1%	$740M
2024-Q3	135	66,882,870	50.7%	$600M
2024-Q2	133	65,702,858	49.8%	$585M
2024-Q1	129	61,778,144	46.8%

Short interest has its own tab now — open SI →

Source: SEC Form 13F — every institution manager (≥ $100M in 13F securities) reporting a long US-listed position, across ~10,250 filers over 10 years of history. 13F is long-only, US-listed, filed up to 45 days after quarter-end.

Activists & large holders· Schedule 13D/G beneficial owners · AMPL

Activists — 13D, active intent

SC US (TTGP), LTD.9.9%NEWSCHEDULE 13D/A · Amd 5 · event 2025-02-20SEC →

10,223,342 shares · 13 reporting persons

Large holders — 13G, passive (top 5 of 9 by % of class)

Holder	% of class	Type	As of
WELLINGTON MANAGEMENT GROUP LLP	10.7%	QII	2026-03-31	SEC →
BlackRock, Inc.	7.6%	QII	2026-06-30	SEC →
VANGUARD PORTFOLIO MANAGEMENT LLC	6%	QII	2026-03-31	SEC →

Institutional ownership· 13F filers holding AMPL · 2026-Q1 methodology → sources →

216 holders

% of shares outstanding held

63.2%

Shares held (13F)

83,357,202

Reporting holders

216

Top holders

largest 100 of 216 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	WELLINGTON MANAGEMENT GROUP LLP	11,154,55611.2M	$76M	8.45%	ADD 468%
2	BlackRock, Inc.	10,162,13810.2M	$69M	7.70%	ADD 4%
3	VANGUARD PORTFOLIO MANAGEMENT LLC	6,165,0916.2M	$42M	4.67%	NEW†
4	VANGUARD CAPITAL MANAGEMENT LLC	4,091,3204.1M	$28M	3.10%	NEW†
5	FMR LLC	3,311,2843.3M	$23M	2.51%	ADD 642%
6	SC US (TTGP), LTD.	2,798,9512.8M	$19M	2.12%	—
7	BAILLIE GIFFORD & CO	2,634,1502.6M	$18M	2.00%	TRIM -4%
8	Nuveen, LLC	2,554,7742.6M	$17M	1.94%	TRIM -3%
9	STATE STREET CORP	2,429,3072.4M	$17M	1.84%	ADD 5%
10	Point72 Asset Management, L.P.	2,411,3002.4M	$16M	1.83%	TRIM -31%
11	GEODE CAPITAL MANAGEMENT, LLC	2,326,1072.3M	$16M	1.76%	ADD 4%
12	MILLENNIUM MANAGEMENT LLC	2,031,8232.0M	$14M	1.54%	TRIM -10%
13	JACOBS LEVY EQUITY MANAGEMENT, INC	1,731,4371.7M	$12M	1.31%	ADD 2881%
14	Optimus Prime Fund Management Co., Ltd.	1,580,1001.6M	$11M	1.20%	—
15	MONIMUS CAPITAL MANAGEMENT, LP	1,264,2861.3M	$9M	0.96%	ADD 240%
16	ArrowMark Colorado Holdings LLC	1,256,0231.3M	$9M	0.95%	TRIM -15%
17	AQR CAPITAL MANAGEMENT LLC	1,235,0281.2M	$8M	0.94%	ADD 46%
18	Meros Investment Management, LP	1,163,8261.2M	$8M	0.88%	ADD 35%
19	GAGNON SECURITIES LLC	1,059,8361.1M	$7M	0.80%	ADD 52%
20	MORGAN STANLEY	920,506920,506	$6M	0.70%	ADD 34%
21	NORTHERN TRUST CORP	868,529868,529	$6M	0.66%	ADD 6%
22	ACADIAN ASSET MANAGEMENT LLC	800,030800,030	$5M	0.61%	ADD 51%
23	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	733,701733,701	$5M	0.56%	TRIM -6%
24	Squarepoint Ops LLC	712,395712,395	$5M	0.54%	TRIM -26%
25	TWO SIGMA INVESTMENTS, LP	691,661691,661	$5M	0.52%	TRIM -34%
26	VANGUARD FIDUCIARY TRUST CO	660,804660,804	$5M	0.50%	NEW
27	Gagnon Advisors, LLC	634,987634,987	$4M	0.48%	ADD 39%
28	DIMENSIONAL FUND ADVISORS LP	617,713617,713	$4M	0.47%	ADD 368%
29	GOLDMAN SACHS GROUP INC	598,270598,270	$4M	0.45%	TRIM -51%
30	Qube Research & Technologies Ltd	597,441597,441	$4M	0.45%	NEW
31	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	576,301576,301	$4M	0.44%	NEW
32	BANK OF AMERICA CORP /DE/	556,052556,052	$4M	0.42%	TRIM -16%
33	ALLIANCEBERNSTEIN L.P.	317,618317,618	$4M	0.24%	TRIM -95%
34	WESTERLY CAPITAL MANAGEMENT, LLC	500,000500,000	$3M	0.38%	—
35	Man Group plc	478,338478,338	$3M	0.36%	ADD 245%
36	Cerity Partners LLC	462,790462,790	$3M	0.35%	—
37	Y-Intercept (Hong Kong) Ltd	454,143454,143	$3M	0.34%	NEW
38	FIRST TRUST ADVISORS LP	424,566424,566	$3M	0.32%	ADD 363%
39	Trigran Investments, Inc.	380,526380,526	$3M	0.29%	NEW
40	Quantinno Capital Management LP	370,515370,515	$3M	0.28%	ADD 1684%
41	Portolan Capital Management, LLC	359,593359,593	$2M	0.27%	TRIM -36%
42	MERCER GLOBAL ADVISORS INC /ADV	329,425329,425	$2M	0.25%	ADD 134%
43	JPMORGAN CHASE & CO	328,940328,940	$2M	0.25%	ADD 59%
44	VOYA INVESTMENT MANAGEMENT LLC	321,657321,657	$2M	0.24%	TRIM -10%
45	Toronado Partners, LLC	318,823318,823	$2M	0.24%	TRIM -59%
46	Madison Asset Management, LLC	314,060314,060	$2M	0.24%	ADD 303%
47	LIGHT STREET CAPITAL MANAGEMENT, LLC	292,844292,844	$2M	0.22%	TRIM -80%
48	G2 Investment Partners Management LLC	270,000270,000	$2M	0.20%	TRIM -5%
49	Verition Fund Management LLC	268,119268,119	$2M	0.20%	ADD 236%
50	Trexquant Investment LP	266,143266,143	$2M	0.20%	TRIM -40%
51	Bank of New York Mellon Corp	262,530262,530	$2M	0.20%	—
52	Circumference Group LLC	238,000238,000	$2M	0.18%	—
53	Swiss National Bank	181,200181,200	$1M	0.14%	—
54	Creative Planning	180,002180,002	$1M	0.14%	ADD 156%
55	MARATHON CAPITAL MANAGEMENT	171,560171,560	$1M	0.13%	ADD 94%
56	Savant Capital, LLC	167,561167,561	$1M	0.13%	—
57	IEQ CAPITAL, LLC	164,576164,576	$1M	0.12%	ADD 7%
58	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	163,946163,946	$1M	0.12%	ADD 3%
59	HSBC HOLDINGS PLC	159,275159,275	$1M	0.12%	TRIM -44%
60	DEUTSCHE BANK AG\	161,360161,360	$1M	0.12%	TRIM -56%
61	ALGERT GLOBAL LLC	157,820157,820	$1M	0.12%	TRIM -51%
62	BOOTHBAY FUND MANAGEMENT, LLC	154,389154,389	$1M	0.12%	ADD 113%
63	S SQUARED TECHNOLOGY, LLC	150,402150,402	$1M	0.11%	NEW
64	Invesco Ltd.	135,201135,201	$922,071	0.10%	ADD 19%
65	Russell Investments Group, Ltd.	131,640131,640	$897,661	0.10%	ADD 73%
66	SUSQUEHANNA INTERNATIONAL GROUP, LLP	123,694123,694	$843,593	0.09%	TRIM -43%
67	UBS Group AG	122,024122,024	$832,204	0.09%	TRIM -78%
68	PRICE T ROWE ASSOCIATES INC /MD/	120,038120,038	$819,000	0.09%	TRIM -2%
69	SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC	118,919118,919	$811,028	0.09%	TRIM -46%
70	Connor, Clark & Lunn Investment Management Ltd.	114,402114,402	$780,222	0.09%	TRIM -43%
71	RHUMBLINE ADVISERS	113,453113,453	$773,741	0.09%	ADD 3%
72	Utah Retirement Systems	112,795112,795	$769,262	0.09%	—
73	UNITED CAPITAL FINANCIAL ADVISORS, LLC	110,599110,599	$754,285	0.08%	—
74	CANADA PENSION PLAN INVESTMENT BOARD	102,900102,900	$701,778	0.08%	TRIM -11%
75	SEI INVESTMENTS CO	100,035100,035	$682,245	0.08%	TRIM -3%
76	WILSON ASSET MANAGEMENT (INTERNATIONAL) PTY LTD	99,05399,053	$675,541	0.08%	—
77	Walleye Capital LLC	90,26290,262	$615,587	0.07%	TRIM -79%
78	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	87,95187,951	$599,826	0.07%	—
79	NANO CAP NEW MILLENNIUM GROWTH FUND L P	60,00060,000	$596,750	0.05%	—
80	BNP PARIBAS FINANCIAL MARKETS	85,99885,998	$586,506	0.07%	ADD 19%
81	Inspire Investing, LLC	74,73174,731	$509,665	0.06%	ADD 85%
82	Legal & General Group Plc	74,34874,348	$507,053	0.06%	TRIM -15%
83	PDT Partners, LLC	66,96466,964	$456,694	0.05%	TRIM -44%
84	Palogic Value Management, L.P.	65,00065,000	$443,300	0.05%	NEW
85	CWM, LLC	62,80862,808	$428,351	0.05%	ADD 40%
86	DRW Securities, LLC	59,66959,669	$406,942	0.05%	NEW
87	VANGUARD ASSET MANAGEMENT, Ltd	59,36259,362	$404,849	0.04%	NEW
88	Cresset Asset Management, LLC	55,68455,684	$379,765	0.04%	—
89	Zurcher Kantonalbank (Zurich Cantonalbank)	53,44153,441	$364,468	0.04%	—
90	MetLife Investment Management, LLC	52,66352,663	$359,162	0.04%	ADD 3%
91	STRS OHIO	51,80051,800	$353,276	0.04%	—
92	STATE OF WISCONSIN INVESTMENT BOARD	49,68449,684	$338,845	0.04%	ADD 123%
93	RENAISSANCE TECHNOLOGIES LLC	47,03147,031	$320,751	0.04%	TRIM -42%
94	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	46,08946,089	$314,327	0.03%	ADD 8%
95	Brevan Howard Capital Management LP	45,53845,538	$310,569	0.03%	ADD 221%
96	SG Americas Securities, LLC	44,52144,521	$304,000	0.03%	TRIM -31%
97	Allspring Global Investments Holdings, LLC	43,30643,306	$294,047	0.03%	TRIM -32%
98	PRELUDE CAPITAL MANAGEMENT, LLC	43,06443,064	$293,696	0.03%	NEW
99	CenterBook Partners LP	40,90840,908	$278,993	0.03%	NEW
100	Blue Trust, Inc.	40,20440,204	$274,191	0.03%	ADD 16%

† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.

Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.

Holder trends· top 15 holders · shares held over 6 quarters

green added · red trimmed

Holder

2024-Q4

2025-Q1

2025-Q2

2025-Q3

2025-Q4

2026-Q1

Latest value

WELLINGTON MANAGEMENT GROUP LLP

—

229K

2.0M

11.2M

$76M

BlackRock, Inc.

6.2M

6.5M

8.5M

9.6M

9.8M

10.2M

$69M

VANGUARD PORTFOLIO MANAGEMENT LLC

—

6.2M

$42M

VANGUARD CAPITAL MANAGEMENT LLC

—

4.1M

$28M

FMR LLC

8.4M

7.3M

3.3M

865K

446K

3.3M

$23M

SC US (TTGP), LTD.

2.8M

$19M

BAILLIE GIFFORD & CO

—

2.0M

2.7M

2.6M

$18M

Nuveen, LLC

—

248K

2.0M

2.2M

2.6M

$17M

STATE STREET CORP

2.0M

2.1M

2.2M

2.3M

2.4M

$17M

Point72 Asset Management, L.P.

410K

344K

1.2M

1.3M

3.5M

2.4M

$16M

GEODE CAPITAL MANAGEMENT, LLC

2.0M

2.2M

2.3M

$16M

MILLENNIUM MANAGEMENT LLC

14K

210K

1.9M

2.1M

2.3M

2.0M

$14M

JACOBS LEVY EQUITY MANAGEMENT, INC

111K

107K

51K

38K

58K

1.7M

$12M

Optimus Prime Fund Management Co., Ltd.

1.6M

$11M

MONIMUS CAPITAL MANAGEMENT, LP

344K

255K

250K

286K

371K

1.3M

$9M

Institutional footprint by quarter

Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding uses today's share count for every quarter (the only count stored).

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	216	83,357,202	63.2%	$570M
2025-Q4	210	80,519,803	61.0%	$932M
2025-Q3	203	78,366,388	59.4%	$840M
2025-Q2	188	77,823,461	59.0%	$965M
2025-Q1	195	72,474,194	54.9%	$739M
2024-Q4	147	70,103,176	53.1%	$740M
2024-Q3	135	66,882,870	50.7%	$600M
2024-Q2	133	65,702,858	49.8%	$585M
2024-Q1	129	61,778,144	46.8%

Short interest has its own tab now — open SI →

Activists & large holders· Schedule 13D/G beneficial owners · AMPL

Activists — 13D, active intent

SC US (TTGP), LTD.9.9%NEWSCHEDULE 13D/A · Amd 5 · event 2025-02-20SEC →

10,223,342 shares · 13 reporting persons

Large holders — 13G, passive (top 5 of 9 by % of class)

Holder	% of class	Type	As of
WELLINGTON MANAGEMENT GROUP LLP	10.7%	QII	2026-03-31	SEC →
BlackRock, Inc.	7.6%	QII	2026-06-30	SEC →
VANGUARD PORTFOLIO MANAGEMENT LLC	6%	QII	2026-03-31	SEC →

AMPL US Equity☆

Institutional ownership· 13F filers holding AMPL · 2026-Q1 methodology → sources →

Top holders

Holder trends· top 15 holders · shares held over 6 quarters

Institutional footprint by quarter

Activists & large holders· Schedule 13D/G beneficial owners · AMPL

Institutional ownership· 13F filers holding AMPL · 2026-Q1 methodology → sources →

Top holders

Holder trends· top 15 holders · shares held over 6 quarters

Institutional footprint by quarter

Activists & large holders· Schedule 13D/G beneficial owners · AMPL

AMPL US Equity