On this page, we present all of the funds holding AMPH from our database of 13F filers, detailed in the table below. The first column indicates the name of each of the funds holding AMPH, with a link to that fund's top holdings. The next columns indicate the amount of AMPH stock held by each of the funds holding AMPH, followed by the AMPH position size held by the fund, and lastly the date of the quarterly filing period the data represents. In total, we count 207 funds holding AMPH within the last two filing periods in our coverage universe of 13F filers, with the largest position size having been reported by BlackRock Inc.. For more details on the positions held by BlackRock Inc. (or by any of the other funds holding AMPH), click the fund name in the "Holder" column of the funds-holding-AMPH table below.

Holder	Amount	Position Size ($ in 1000's)	As of
BlackRock Inc.	7,147,813	$200,854	09/30/2022
AMPH	7,147,813	$200,854	09/30/2022
Federated Hermes Inc.	3,265,179	$91,751	09/30/2022
AMPH	3,265,179	$91,751	09/30/2022
Vanguard Group Inc.	2,606,162	$73,234	09/30/2022
AMPH	2,606,162	$73,234	09/30/2022
Dimensional Fund Advisors LP	1,839,134	$51,683	09/30/2022
AMPH	1,839,134	$51,683	09/30/2022
State Street Corp	1,533,793	$43,100	09/30/2022
AMPH	1,533,793	$43,100	09/30/2022
Price T Rowe Associates Inc. MD	808,731	$22,727	09/30/2022
AMPH	808,731	$22,727	09/30/2022
Fuller & Thaler Asset Management Inc.	715,181	$20,097	09/30/2022
AMPH	715,181	$20,097	09/30/2022
Morgan Stanley	710,384	$19,962	09/30/2022
AMPH	710,384	$19,962	09/30/2022
Geode Capital Management LLC	708,206	$19,900	09/30/2022
AMPH	708,206	$19,900	09/30/2022
Invesco Ltd.	587,943	$16,522	09/30/2022
AMPH	587,943	$16,522	09/30/2022
Renaissance Technologies LLC	433,800	$12,190	09/30/2022
AMPH	433,800	$12,190	09/30/2022
Nuveen Asset Management LLC	416,607	$11,706	09/30/2022
AMPH	416,607	$11,706	09/30/2022
Northern Trust Corp	415,117	$11,666	09/30/2022
AMPH	415,117	$11,666	09/30/2022
Mesirow Institutional Investment Management Inc.	377,099	$10,596	09/30/2022
AMPH	377,099	$10,596	09/30/2022
Bank of New York Mellon Corp	362,875	$10,197	09/30/2022
AMPH	362,875	$10,197	09/30/2022
Nordea Investment Management AB	345,378	$10,116	09/30/2022
AMPH	345,378	$10,116	09/30/2022
Eagle Asset Management Inc.	310,255	$8,718	09/30/2022
AMPH	310,255	$8,718	09/30/2022
Charles Schwab Investment Management Inc.	307,293	$8,635	09/30/2022
AMPH	307,293	$8,635	09/30/2022
Portolan Capital Management LLC	282,187	$7,929	09/30/2022
AMPH	282,187	$7,929	09/30/2022
Principal Financial Group Inc.	244,743	$6,878	09/30/2022
AMPH	244,743	$6,878	09/30/2022
Silvercrest Asset Management Group LLC	225,156	$6,327	09/30/2022
AMPH	225,156	$6,327	09/30/2022
JPMorgan Chase & Co.	219,683	$6,174	09/30/2022
AMPH	219,683	$6,174	09/30/2022
Frontier Capital Management Co. LLC	204,573	$5,749	09/30/2022
AMPH	204,573	$5,749	09/30/2022
Arrowstreet Capital Limited Partnership	201,065	$5,650	09/30/2022
AMPH	201,065	$5,650	09/30/2022
Hillsdale Investment Management Inc.	197,738	$5,557	09/30/2022
AMPH	197,738	$5,557	09/30/2022
Citadel Advisors LLC		$5,521	09/30/2022
AMPH	175,265	$4,925	09/30/2022
Call	21,200	$596	09/30/2022
Ameriprise Financial Inc.	192,894	$5,421	09/30/2022
AMPH	192,894	$5,421	09/30/2022
Jacobs Levy Equity Management Inc.	188,039	$5,284	09/30/2022
AMPH	188,039	$5,284	09/30/2022
Goldman Sachs Group Inc.	174,343	$4,899	09/30/2022
AMPH	174,343	$4,899	09/30/2022
Assenagon Asset Management S.A.	173,479	$4,861	12/31/2022
AMPH	173,479	$4,861	12/31/2022
Voloridge Investment Management LLC	162,258	$4,559	09/30/2022
AMPH	162,258	$4,559	09/30/2022
AXA S.A.	146,265	$4,110	09/30/2022
AMPH	146,265	$4,110	09/30/2022
Prudential Financial Inc.	141,132	$3,966	09/30/2022
AMPH	141,132	$3,966	09/30/2022
Lam Group Inc.	130,250	$3,650	12/31/2022
AMPH	130,250	$3,650	12/31/2022
Allspring Global Investments Holdings LLC	110,365	$3,092	12/31/2022
AMPH	110,365	$3,092	12/31/2022
Acadian Asset Management LLC	107,173	$3,008	09/30/2022
AMPH	107,173	$3,008	09/30/2022
Quantedge Capital Pte Ltd	106,200	$2,984	09/30/2022
AMPH	106,200	$2,984	09/30/2022
Oberweis Asset Management Inc.	101,500	$2,852	09/30/2022
AMPH	101,500	$2,852	09/30/2022
AQR Capital Management LLC	94,753	$2,663	09/30/2022
AMPH	94,753	$2,663	09/30/2022
Swiss National Bank	92,600	$2,602	09/30/2022
AMPH	92,600	$2,602	09/30/2022
Legal & General Group Plc	91,440	$2,570	09/30/2022
AMPH	91,440	$2,570	09/30/2022
Two Sigma Advisers LP	90,600	$2,546	09/30/2022
AMPH	90,600	$2,546	09/30/2022
Bank of America Corp DE	88,767	$2,495	09/30/2022
AMPH	88,767	$2,495	09/30/2022
Rhumbline Advisers	84,586	$2,377	09/30/2022
AMPH	84,586	$2,377	09/30/2022
Mutual of America Capital Management LLC	83,250	$2,339	09/30/2022
AMPH	83,250	$2,339	09/30/2022
Qube Research & Technologies Ltd	81,792	$2,298	09/30/2022
AMPH	81,792	$2,298	09/30/2022
Shaker Investments LLC OH	80,399	$2,259	09/30/2022
AMPH	80,399	$2,259	09/30/2022
	448	$2,110	09/30/2022
AMPH	448	$2,110	09/30/2022
Globeflex Capital L P	72,253	$2,030	09/30/2022
AMPH	72,253	$2,030	09/30/2022
Russell Investments Group Ltd.	71,394	$2,004	09/30/2022
AMPH	71,394	$2,004	09/30/2022
Public Sector Pension Investment Board	70,079	$1,969	09/30/2022
AMPH	70,079	$1,969	09/30/2022
Martingale Asset Management L P	65,536	$1,842	09/30/2022
AMPH	65,536	$1,842	09/30/2022
Schroder Investment Management Group	59,176	$1,663	09/30/2022
AMPH	59,176	$1,663	09/30/2022
D. E. Shaw & Co. Inc.	57,879	$1,626	09/30/2022
AMPH	57,879	$1,626	09/30/2022
American Century Companies Inc.	55,980	$1,573	09/30/2022
AMPH	55,980	$1,573	09/30/2022
Barclays PLC	55,504	$1,559	09/30/2022
AMPH	55,504	$1,559	09/30/2022
Aviva PLC	54,477	$1,531	09/30/2022
AMPH	54,477	$1,531	09/30/2022
Alliancebernstein L.P.	50,489	$1,419	09/30/2022
AMPH	50,489	$1,419	09/30/2022
Teacher Retirement System of Texas	49,156	$1,381	09/30/2022
AMPH	49,156	$1,381	09/30/2022
D.A. Davidson & CO.	49,090	$1,379	09/30/2022
AMPH	49,090	$1,379	09/30/2022
California State Teachers Retirement System	49,024	$1,378	09/30/2022
AMPH	49,024	$1,378	09/30/2022
UBS Asset Management Americas Inc.	46,423	$1,304	09/30/2022
AMPH	46,423	$1,304	09/30/2022
Jane Street Group LLC		$1,295	09/30/2022
AMPH	37,295	$1,048	09/30/2022
Call	8,800	$247	09/30/2022
Renaissance Group LLC	44,364	$1,247	09/30/2022
AMPH	44,364	$1,247	09/30/2022
Occudo Quantitative Strategies LP	43,450	$1,221	09/30/2022
AMPH	43,450	$1,221	09/30/2022
Great West Life Assurance Co. Can	42,367	$1,189	09/30/2022
AMPH	42,367	$1,189	09/30/2022
Cornercap Investment Counsel Inc.	41,046	$1,153	09/30/2022
AMPH	41,046	$1,153	09/30/2022
Thrivent Financial for Lutherans	39,521	$1,111	09/30/2022
AMPH	39,521	$1,111	09/30/2022
State of Wisconsin Investment Board	39,081	$1,098	09/30/2022
AMPH	39,081	$1,098	09/30/2022
Credit Suisse AG	38,929	$1,094	09/30/2022
AMPH	38,929	$1,094	09/30/2022
Exchange Traded Concepts LLC	37,152	$1,041	12/31/2022
AMPH	37,152	$1,041	12/31/2022
Robeco Institutional Asset Management B.V.	36,497	$1,026	09/30/2022
AMPH	36,497	$1,026	09/30/2022
Victory Capital Management Inc.	36,427	$1,024	09/30/2022
AMPH	36,427	$1,024	09/30/2022
Algert Global LLC	35,523	$998	09/30/2022
AMPH	35,523	$998	09/30/2022
Commonwealth of Pennsylvania Public School Empls Retrmt SYS	34,834	$979	09/30/2022
AMPH	34,834	$979	09/30/2022
Schonfeld Strategic Advisors LLC	32,900	$924	09/30/2022
AMPH	32,900	$924	09/30/2022
Cubist Systematic Strategies LLC	32,330	$908	09/30/2022
AMPH	32,330	$908	09/30/2022
Susquehanna International Group LLP		$893	09/30/2022
Call	47,500	$1,335	09/30/2022
Put	28,100	$790	09/30/2022
AMPH	12,368	$348	09/30/2022
Marshall Wace LLP	31,638	$890	09/30/2022
AMPH	31,638	$890	09/30/2022
Citigroup Inc.	30,990	$871	09/30/2022
AMPH	30,990	$871	09/30/2022
FMR LLC	29,276	$823	09/30/2022
AMPH	29,276	$823	09/30/2022
New York State Common Retirement Fund	28,533	$799	12/31/2022
AMPH	28,533	$799	12/31/2022
New York State Teachers Retirement System	28,387	$795	12/31/2022
AMPH	28,387	$795	12/31/2022
Jackson Creek Investment Advisors LLC	27,577	$775	09/30/2022
AMPH	27,577	$775	09/30/2022
Texas Permanent School Fund	27,499	$773	09/30/2022
AMPH	27,499	$773	09/30/2022
Ziegler Capital Management LLC	27,367	$767	12/31/2022
AMPH	27,367	$767	12/31/2022
State of Tennessee Treasury Department	26,639	$748	09/30/2022
AMPH	26,639	$748	09/30/2022
Trexquant Investment LP	26,482	$744	09/30/2022
AMPH	26,482	$744	09/30/2022
WINTON GROUP Ltd	26,353	$741	09/30/2022
AMPH	26,353	$741	09/30/2022
Assetmark Inc.	26,132	$734	09/30/2022
AMPH	26,132	$734	09/30/2022
State of Alaska Department of Revenue	26,168	$733	12/31/2022
AMPH	26,168	$733	12/31/2022
Raymond James & Associates	25,912	$728	09/30/2022
AMPH	25,912	$728	09/30/2022
Sei Investments Co.	25,632	$720	09/30/2022
AMPH	25,632	$720	09/30/2022
Panagora Asset Management Inc.	24,668	$693	09/30/2022
AMPH	24,668	$693	09/30/2022
Yousif Capital Management LLC	23,647	$663	12/31/2022
AMPH	23,647	$663	12/31/2022
Gotham Asset Management LLC	23,032	$647	09/30/2022
AMPH	23,032	$647	09/30/2022
Navellier & Associates Inc	22,591	$635	09/30/2022
AMPH	22,591	$635	09/30/2022
Comerica Bank	20,752	$601	12/31/2022
AMPH	20,752	$601	12/31/2022
American International Group Inc.	20,973	$589	09/30/2022
AMPH	20,973	$589	09/30/2022
Allianz Asset Management GmbH	20,924	$588	09/30/2022
AMPH	20,924	$588	09/30/2022
MetLife Investment Management LLC	20,467	$575	09/30/2022
AMPH	20,467	$575	09/30/2022
Summit Global Investments	20,100	$565	09/30/2022
AMPH	20,100	$565	09/30/2022
Voya Investment Management LLC	19,696	$553	09/30/2022
AMPH	19,696	$553	09/30/2022
Amalgamated Bank	18,577	$522	09/30/2022
AMPH	18,577	$522	09/30/2022
Deutsche Bank AG	18,309	$515	09/30/2022
AMPH	18,309	$515	09/30/2022
State Board of Administration of Florida Retirement System	18,259	$513	09/30/2022
AMPH	18,259	$513	09/30/2022
Strs Ohio	18,300	$512	12/31/2022
AMPH	18,300	$512	12/31/2022
Louisiana State Employees Retirement System	17,900	$502	12/31/2022
AMPH	17,900	$502	12/31/2022
Mirae Asset Global Investments Co. Ltd.	17,227	$484	09/30/2022
AMPH	17,227	$484	09/30/2022
DekaBank Deutsche Girozentrale	16,800	$477	09/30/2022
AMPH	16,800	$477	09/30/2022
BNP Paribas Arbitrage SA	16,520	$464	09/30/2022
AMPH	16,520	$464	09/30/2022
Alberta Investment Management Corp	16,064	$451	09/30/2022
AMPH	16,064	$451	09/30/2022
ARP Americas LP	15,800	$443	12/31/2022
AMPH	15,800	$443	12/31/2022
The Manufacturers Life Insurance Company	15,601	$438	09/30/2022
AMPH	15,601	$438	09/30/2022
Maryland State Retirement & Pension System	15,518	$435	12/31/2022
AMPH	15,518	$435	12/31/2022
UBS Group AG	15,450	$434	09/30/2022
AMPH	15,450	$434	09/30/2022
Advisory Research Inc.	15,148	$426	09/30/2022
AMPH	15,148	$426	09/30/2022
Capital Impact Advisors LLC	14,669	$416	09/30/2022
AMPH	14,669	$416	09/30/2022
Vestcor Inc	14,355	$403	09/30/2022
AMPH	14,355	$403	09/30/2022
Guggenheim Capital LLC	14,073	$395	09/30/2022
AMPH	14,073	$395	09/30/2022
New York Life Investment Management LLC	14,020	$394	09/30/2022
AMPH	14,020	$394	09/30/2022
Millennium Management LLC	13,760	$387	09/30/2022
AMPH	13,760	$387	09/30/2022
APG Asset Management N.V.	13,400	$384	09/30/2022
AMPH	13,400	$384	09/30/2022
Shell Asset Management Co.	13,398	$376	09/30/2022
AMPH	13,398	$376	09/30/2022
Oregon Public Employees Retirement Fund	12,547	$352	12/31/2022
AMPH	12,547	$352	12/31/2022
Bluestein R H & Co.	12,500	$351	09/30/2022
AMPH	12,500	$351	09/30/2022
Juncture Wealth Strategies LLC	12,305	$345	12/31/2022
AMPH	12,305	$345	12/31/2022
Cornerstone Investment Partners LLC	11,900	$334	09/30/2022
AMPH	11,900	$334	09/30/2022
Los Angeles Capital Management & Equity Research Inc.	11,755	$330	09/30/2022
AMPH	11,755	$330	09/30/2022
Crossmark Global Holdings Inc.	11,611	$325	12/31/2022
AMPH	11,611	$325	12/31/2022
Public Employees Retirement Association of Colorado	11,238	$316	09/30/2022
AMPH	11,238	$316	09/30/2022
Jupiter Asset Management Ltd.	11,067	$311	09/30/2022
AMPH	11,067	$311	09/30/2022
Teachers Retirement System of The State of Kentucky	11,021	$309	09/30/2022
AMPH	11,021	$309	09/30/2022
Alps Advisors Inc.	10,954	$308	09/30/2022
AMPH	10,954	$308	09/30/2022
Ensign Peak Advisors Inc	10,900	$306	09/30/2022
AMPH	10,900	$306	09/30/2022
Glenmede Trust Co. NA	10,865	$305	09/30/2022
AMPH	10,865	$305	09/30/2022
LSV Asset Management	10,700	$301	09/30/2022
AMPH	10,700	$301	09/30/2022
Arizona State Retirement System	10,616	$298	09/30/2022
AMPH	10,616	$298	09/30/2022
Hightower 6M Holding LLC	10,307	$290	09/30/2022
AMPH	10,307	$290	09/30/2022
Money Concepts Capital Corp	10,099	$284	09/30/2022
AMPH	10,099	$284	09/30/2022
Franklin Resources Inc.	9,584	$269	09/30/2022
AMPH	9,584	$269	09/30/2022
ProShare Advisors LLC	9,386	$264	09/30/2022
AMPH	9,386	$264	09/30/2022
Veriti Management LLC	9,260	$259	12/31/2022
AMPH	9,260	$259	12/31/2022
Hsbc Holdings PLC	8,093	$232	09/30/2022
AMPH	8,093	$232	09/30/2022
Truist Financial Corp	7,928	$223	09/30/2022
AMPH	7,928	$223	09/30/2022
Bank of Montreal Can	6,816	$222	09/30/2022
AMPH	6,816	$222	09/30/2022
Perigon Wealth Management LLC	7,850	$221	09/30/2022
AMPH	7,850	$221	09/30/2022
Janus Henderson Group PLC	7,715	$217	09/30/2022
AMPH	7,715	$217	09/30/2022
Cim LLC	6,652	$208	09/30/2022
AMPH	6,652	$208	09/30/2022
FinTrust Capital Advisors LLC	7,000	$196	09/30/2022
AMPH	7,000	$196	09/30/2022
Zurcher Kantonalbank Zurich Cantonalbank	6,462	$182	09/30/2022
AMPH	6,462	$182	09/30/2022
SG3 Management LLC		$165	09/30/2022
AMPH	8,878	$249	09/30/2022
Put	3,000	$84	09/30/2022
Lazard Asset Management LLC	5,331	$149	09/30/2022
AMPH	5,331	$149	09/30/2022
Tower Research Capital LLC TRC	5,143	$144	09/30/2022
AMPH	5,143	$144	09/30/2022
Wells Fargo & Company MN	4,861	$137	09/30/2022
AMPH	4,861	$137	09/30/2022
SG Americas Securities LLC	4,434	$125	09/30/2022
AMPH	4,434	$125	09/30/2022
Royal Bank of Canada	4,011	$112	09/30/2022
AMPH	4,011	$112	09/30/2022
KBC Group NV	3,178	$89	09/30/2022
AMPH	3,178	$89	09/30/2022
Ameritas Investment Partners Inc.	3,073	$86	09/30/2022
AMPH	3,073	$86	09/30/2022
Dupont Capital Management Corp	2,980	$84	12/31/2022
AMPH	2,980	$84	12/31/2022
The PNC Financial Services Group Inc.	2,863	$80	09/30/2022
AMPH	2,863	$80	09/30/2022
Point72 Hong Kong Ltd	2,683	$75	09/30/2022
AMPH	2,683	$75	09/30/2022
US Bancorp DE	2,492	$70	09/30/2022
AMPH	2,492	$70	09/30/2022
Metropolitan Life Insurance Co NY	2,267	$64	09/30/2022
AMPH	2,267	$64	09/30/2022
	2,167	$61	09/30/2022
AMPH	2,167	$61	09/30/2022
Advisor Group Holdings Inc.	1,801	$50	09/30/2022
AMPH	1,801	$50	09/30/2022
Allworth Financial LP	1,383	$39	12/31/2022
AMPH	1,383	$39	12/31/2022
Nisa Investment Advisors LLC	1,130	$35	09/30/2022
AMPH	1,130	$35	09/30/2022
USA Financial Portformulas Corp	1,181	$33	09/30/2022
AMPH	1,181	$33	09/30/2022
Pinnacle Financial Partners Inc.	1,000	$28	09/30/2022
AMPH	1,000	$28	09/30/2022
Proequities Inc.		$25	12/31/2022
AMPH	883	$25	12/31/2022
Put	0	$0	12/31/2022
Call	0	$0	12/31/2022
Ronald Blue Trust Inc.	611	$17	12/31/2022
AMPH	611	$17	12/31/2022
Anfield Capital Management LLC	614	$17	09/30/2022
AMPH	614	$17	09/30/2022
Fifth Third Bancorp	575	$16	12/31/2022
AMPH	575	$16	12/31/2022
CWM LLC	577	$16	09/30/2022
AMPH	577	$16	09/30/2022
Group One Trading L.P.		$14	09/30/2022
Call	500	$14	09/30/2022
Signaturefd LLC	479	$13	12/31/2022
AMPH	479	$13	12/31/2022
Versant Capital Management Inc	474	$13	12/31/2022
AMPH	474	$13	12/31/2022
Macquarie Group Ltd.	0	$13	09/30/2022
AMPH	0	$13	09/30/2022
China Universal Asset Management Co. Ltd.	459	$13	09/30/2022
AMPH	459	$13	09/30/2022
Huntington National Bank	411	$12	09/30/2022
AMPH	411	$12	09/30/2022
TCI Wealth Advisors Inc.	379	$11	09/30/2022
AMPH	379	$11	09/30/2022
Ellevest Inc.	383	$11	09/30/2022
AMPH	383	$11	09/30/2022
Quadrant Capital Group LLC	404	$11	09/30/2022
AMPH	404	$11	09/30/2022
Harbour Investments Inc.	270	$9	09/30/2022
AMPH	270	$9	09/30/2022
Wipfli Financial Advisors LLC	331	$9	09/30/2022
AMPH	331	$9	09/30/2022
IFP Advisors Inc	93	$6	09/30/2022
AMPH	93	$6	09/30/2022
Meeder Asset Management Inc.	175	$5	09/30/2022
AMPH	175	$5	09/30/2022
Daiwa Securities Group Inc.	165	$5	09/30/2022
AMPH	165	$5	09/30/2022
Massmutual Trust Co. FSB ADV	97	$3	12/31/2022
AMPH	97	$3	12/31/2022
City State Bank	100	$3	12/31/2022
AMPH	100	$3	12/31/2022
Bessemer Group Inc.	114	$3	09/30/2022
AMPH	114	$3	09/30/2022
Parkside Financial Bank & Trust	117	$3	09/30/2022
AMPH	117	$3	09/30/2022
Glassman Wealth Services	97	$3	09/30/2022
AMPH	97	$3	09/30/2022
Guardian Wealth Advisors LLC	97	$3	09/30/2022
AMPH	97	$3	09/30/2022
Capital Advisors Ltd. LLC	75	$2	09/30/2022
AMPH	75	$2	09/30/2022
Lindbrook Capital LLC	42	$1	12/31/2022
AMPH	42	$1	12/31/2022
Farmers & Merchants Investments Inc.	24	$1	09/30/2022
AMPH	24	$1	09/30/2022
Aua Capital Management LLC	41	$1	09/30/2022
AMPH	41	$1	09/30/2022
Absolute Capital Management LLC	37	$1	09/30/2022
AMPH	37	$1	09/30/2022
AdvisorNet Financial Inc	1	$0	12/31/2022
AMPH	1	$0	12/31/2022
SJS Investment Consulting Inc.	1	$0	12/31/2022
AMPH	1	$0	12/31/2022
Parallel Advisors LLC	13	$0	09/30/2022
AMPH	13	$0	09/30/2022
Rockefeller Capital Management L.P.	14	$0	09/30/2022
AMPH	14	$0	09/30/2022
Global Retirement Partners LLC	11	$0	09/30/2022
AMPH	11	$0	09/30/2022
Disciplined Investments LLC	2	$0	09/30/2022
AMPH	2	$0	09/30/2022
Schubert & Co	1	$0	09/30/2022
AMPH	1	$0	09/30/2022
Covestor Ltd	13	$0	09/30/2022
AMPH	13	$0	09/30/2022

See Summary: Institutional Holders of AMPH
See Details: Top 10 Hedge Funds Holding AMPH
Also See: AMPH Insider Buying
Also See: AMPH Holdings Changes

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AMPH — Performance