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Disclosery

AMTM AMENTUM HOLDINGS INC

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Stock (common), issuer CIK 2011286

475 managers (487 13F filers) reported a position in AMTM shares at 2026-03-31, 211,052,091 shares in all. 62 filers opened a position and 61 filers sold out during the quarter.

Managers
475
13F filers
487
New
62
Added
151
Reduced
152
Sold out
61
Shares held by filers
211,052,091

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
AMERICAN SECURITIES LLC45,026,743$1.17B29.88%013F-HRTimeline
Invesco Ltd.in group Invesco Ltd.21,473,778$560M0.05%-360,22513F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.17,841,283$465M0.01%+382,18413F-HRTimelineGroup
VANGUARD GROUP INCgroup of 7 filers holding15,696,449$409M+15,678,698Timeline
PRIMECAP MANAGEMENT CO/CA/12,085,294$315M0.25%-41,63313F-HRTimeline
FMR LLCin group FMR LLC5,578,386$145M0.01%-1,128,91813F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP5,079,041$132M<0.01%+17,42113F-HRTimelineGroup
FRONTIER CAPITAL MANAGEMENT CO LLC4,930,210$129M1.32%-842,76613F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP3,787,420$98.8M0.02%+1,954,49413F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC2,814,415$73.4M<0.01%+155,05113F-HRTimelineGroup
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…2,785,134$72.6M0.1%+823,20713F-HRTimelineGroup
Focus Partners Wealthin group Focus Partners Wealth2,604,911$67.9M0.08%-189,50613F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/2,405,041$62.7M<0.01%+1,247,61413F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY2,234,913$58.3M<0.01%+159,56113F-HRTimelineGroup
Thrivent Financial for Lutheransin group Thrivent Financial for Luther…2,100,457$54.8M0.1%+31,35313F-HRTimelineGroup
Arvin Capital Management LP2,071,200$54M12.62%+434,70813F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co2,067,930$53.9M0.01%+115,92813F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding1,958,732$51.1M+1,499,614Timeline
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.1,630,563$42.5M0.07%+935,27613F-HRTimelineGroup
Ruane, Cunniff & Goldfarb L.P.1,622,982$42.3M0.7%-771,14713F-HRTimeline
SEGRA CAPITAL MANAGEMENT, LLC1,612,726$42.1M32.74%+1,007,91613F-HRTimeline
Permian Investment Partners, LP1,567,000$40.9M4.52%new13F-HRTimeline
TORONTO DOMINION BANKin group TORONTO DOMINION BANK1,565,223$40.8M0.08%new13F-HRTimelineGroup
THOMPSON SIEGEL & WALMSLEY LLC1,525,884$39.8M0.7%-395,92513F-HRTimeline
BRIGHTLINE CAPITAL MANAGEMENT, LLC1,396,000$36.4M10.77%+4,00013F-HRTimeline
Verition Fund Management LLC1,297,946$33.9M0.33%+432,77413F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC1,199,491$31.3M0.03%+52,01413F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC1,131,438$29.5M<0.01%+487,28013F-HRTimelineGroup
LOOMIS SAYLES & CO L Pin group LOOMIS SAYLES & CO L P1,081,336$28.2M0.04%-37,59413F-HRTimelineGroup
Troluce Capital Advisors LLC1,000,000$26.1M2.76%new13F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP984,105$25.7M<0.01%+31,12813F-HRTimelineGroup
COOPER CREEK PARTNERS MANAGEMENT LLC929,334$24.2M1.17%-623,74013F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp908,599$23.7M<0.01%-13,49813F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP900,177$23.5M0.02%+262,19113F-HRTimelineGroup
CACTI ASSET MANAGEMENT LLC881,692$23M1.39%013F-HRTimeline
MOORE CAPITAL MANAGEMENT, LP873,610$22.8M0.83%+398,29613F-HRTimeline
Nuveen, LLCin group TIAA871,795$22.7M0.01%+58,02113F-HRTimelineGroup
AVENIR CORP841,099$21.9M2.67%-9,84513F-HRTimeline
683 Capital Management, LLCin group 683 Capital Management, LLC775,000$20.2M1.87%-60,00013F-HRTimelineGroup
PRINCIPAL FINANCIAL GROUP INCin group PRINCIPAL FINANCIAL GROUP INC744,728$19.4M0.01%+16,31413F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…713,828$18.6M0.02%+276,81213F-HRTimelineGroup
Ancora Advisors LLCin group Ancora Advisors LLC703,119$18.3M0.39%+300,77313F-HRTimelineGroup
Penn Capital Management Company, LLC694,352$18.2M1.41%-49,58513F-HRTimeline
FIL Ltdin group FIL Ltd652,159$17M0.01%-777,22513F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN636,674$16.6M<0.01%+171,93513F-HR/ATimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC631,055$16.5M0.01%+569,86813F-HRTimelineGroup
Public Sector Pension Investment Board549,797$14.3M0.04%+19,23113F-HRTimeline
ROYCE & ASSOCIATES LP549,778$14.3M0.14%+54,49213F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPgroup of 2 filers holding547,829$14.3M+327,898Timeline
VAN ECK ASSOCIATES CORPin group VAN ECK ASSOCIATES CORP547,644$14.3M0.01%+16,63713F-HRTimelineGroup
Gotham Asset Management, LLC521,041$13.6M0.04%-114,38913F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC507,843$13.2M0.01%-944,20613F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND502,487$13.1M0.02%-32,73113F-HRTimeline
CI INVESTMENTS INC.in group CI INVESTMENTS INC.420,068$11M0.05%-5,46013F-HRTimelineGroup
Vident Advisory, LLCin group Vident Advisory, LLC388,862$10.1M0.09%+6,32213F-HRTimelineGroup
De Lisle Partners LLP379,818$9.9M1.18%new13F-HRTimeline
Legacy Advisors, LLC9,064,278$9.06M1.07%-750,01113F-HRTimeline
Aristotle Capital Boston, LLCin group ARISTOTLE INVESTMENT SERVICES…344,976$9.02M0.56%-13,89113F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc334,896$8.73M<0.01%-33,70913F-HRTimelineGroup
HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC333,800$8.71M0.03%+65,42513F-HRTimeline
Mawer Investment Management Ltd.333,790$8.71M0.06%new13F-HRTimeline
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC329,745$8.6M<0.01%-8,85413F-HR/ATimelineGroup
Rovida Investment Management Ltd315,000$8.21M1.03%new13F-HRTimeline
Swiss National Bank313,391$8.17M<0.01%+1,60013F-HRTimeline
Hyperion Capital Advisors LP303,576$7.92M3.81%-188,29613F-HRTimeline
RHUMBLINE ADVISERS300,293$7.83M0.01%+8,85213F-HRTimeline
EXCHANGE TRADED CONCEPTS, LLC295,008$7.69M0.06%-15,51313F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO294,668$7.69M0.01%+77,62413F-HRTimelineGroup
GRIZZLYROCK CAPITAL, LLC289,113$7.54M5.97%+4,00013F-HRTimeline
California Public Employees Retirement …277,052$7.23M<0.01%-1,59213F-HRTimeline
SG Americas Securities, LLC274,602$7.16M0.01%-70,73913F-HRTimeline
FIFTH THIRD BANCORPin group FIFTH THIRD BANK, NATIONAL AS…273,316$7.13M0.01%+270,72713F-HRTimelineGroup
FIRST NATIONAL BANK OF OMAHAgroup of 2 filers holding260,746$6.63M+83,046Timeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC245,824$6.41M<0.01%+77,77913F-HRTimelineGroup
Soviero Asset Management, LP240,000$6.26M3.51%+62,00013F-HRTimeline
AWH Capital, L.P.235,250$6.14M5.57%013F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA231,742$6.04M<0.01%-34,80113F-HRTimelineGroup
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP228,083$5.95M<0.01%-149,74513F-HRTimelineGroup
Hudson Value Partners, LLC203,910$5.32M1.59%+15,91713F-HRTimeline
OPPENHEIMER ASSET MANAGEMENT INC.group of 2 filers holding197,026$5.14MnewTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC191,979$5.01M0.01%+181,17013F-HRTimelineGroup
Telos Capital Management, Inc.189,901$4.95M0.47%+2,43513F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…184,555$4.81M0.01%+34,64313F-HRTimeline
Hel Ved Capital Management Ltd178,500$4.66M0.81%new13F-HRTimeline
North Growth Management Ltd.172,000$4.47M0.69%+74,00013F-HRTimeline
OpenArc Corporate Advisory, LLC170,352$4.44M0.06%-29,97313F-HRTimeline
NEW YORK STATE TEACHERS RETIREMENT SYST…165,329$4.31M0.01%-72813F-HRTimeline
GAMCO Investors (Gabelli)group of 2 filers holding165,114$4.31M+51,865Timeline
WEDGE CAPITAL MANAGEMENT L L P/NC164,666$4.29M0.08%new13F-HRTimeline
Quantinno Capital Management LP145,574$3.8M0.01%+67,60313F-HRTimeline
PRICE T ROWE ASSOCIATES INC /MD/145,253$3.79M<0.01%+15,77113F-HRTimeline
CenterBook Partners LP143,698$3.75M0.2%-78,52513F-HRTimeline
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC140,430$3.66M<0.01%-1,99213F-HRTimelineGroup
BESSEMER GROUP INCin group BESSEMER GROUP INC125,952$3.28M0.01%+124,21313F-HRTimelineGroup
Holocene Advisors, LP123,197$3.21M0.01%+43,87613F-HRTimeline
South Dakota Investment Council123,037$3.21M0.06%013F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…120,865$3.15M0.01%013F-HRTimeline
Bryn Mawr Trust Advisors, LLC116,871$3.05M0.15%+14,92213F-HRTimeline
SOROS FUND MANAGEMENT LLCin group SOROS FUND MANAGEMENT LLC107,606$2.81M0.04%-1,69713F-HRTimelineGroup
STATE OF WISCONSIN INVESTMENT BOARD101,983$2.66M0.01%-1,69913F-HRTimeline
ALGERT GLOBAL LLC101,010$2.63M0.04%-71,52313F-HR/ATimeline
Strategic Global Advisors, LLC95,718$2.5M0.4%new13F-HRTimeline
LPL Financial LLC88,800$2.32M<0.01%+2,12213F-HRTimeline
BOOTHBAY FUND MANAGEMENT, LLC86,192$2.25M0.05%+78,97813F-HRTimeline
Illinois Municipal Retirement Fund83,407$2.18M0.03%new13F-HRTimeline
WEALTH ENHANCEMENT ADVISORY SERVICES, L…79,158$2.14M<0.01%-76,62113F-HRTimeline
ALLIANCEBERNSTEIN L.P.73,806$2.14M<0.01%+2,53313F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO84,772$2.13M<0.01%-4,51913F-HR/ATimelineGroup
CSM Advisors, LLC81,241$2.12M0.05%-3,51813F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC80,638$2.1M<0.01%+25,05313F-HRTimelineGroup
Pine Valley Investments Ltd Liability Co79,275$2.07M0.1%+3,38113F-HRTimeline
Qube Research & Technologies Ltd77,369$2.02M<0.01%-68,81313F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…77,196$2.01M0.02%+42,17813F-HRTimelineGroup
State of Alaska, Department of Revenue75,861$1.98M0.02%-2,24913F-HRTimeline
Mraz, Amerine & Associates, Inc.71,985$1.88M0.28%+7,75713F-HRTimeline
Oak Thistle LLC71,759$1.87M0.18%+38,80313F-HRTimeline
Ridge Creek Global, Inc70,548$1.84M1.56%-34013F-HRTimeline
Police & Firemen's Retirement System of…70,277$1.83M0.02%+3,62313F-HRTimeline
State of New Jersey Common Pension Fund…in group State of New Jersey Common Pe…70,235$1.83M0.01%-28,74913F-HRTimelineGroup
JANUS HENDERSON GROUP PLCin group Janus Henderson69,400$1.81M<0.01%013F-HR/ATimelineGroup
Louisiana State Employees Retirement Sy…68,200$1.78M0.03%-2,00013F-HRTimeline
Treasurer of the State of North Carolina68,159$1.78M0.01%+1,45213F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.66,171$1.73M<0.01%new13F-HRTimelineGroup
Creative Planningin group Creative Planning64,780$1.69M<0.01%+19,94613F-HRTimelineGroup
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC61,609$1.61M<0.01%-6,08813F-HRTimelineGroup
K2 PRINCIPAL FUND, L.P.60,000$1.56M0.17%new13F-HRTimeline
AMALGAMATED BANK58,351$1.52M0.01%+4,08413F-HRTimeline
Crestwood Advisors Group, LLC56,817$1.48M0.02%-3,12213F-HRTimeline
WINTON GROUP Ltdin group WINTON GROUP Ltd55,500$1.45M0.05%-45,94913F-HRTimelineGroup
NATIXIS ADVISORS, LLCin group Natixis Investment Managers54,406$1.42M<0.01%-3,18713F-HRTimelineGroup
Marex Group Ltdin group Marex Group Ltd53,043$1.38M0.01%+40,04113F-HRTimelineGroup
MIRABELLA FINANCIAL SERVICES LLP52,498$1.37M0.13%+44,69213F-HRTimeline
WOLVERINE ASSET MANAGEMENT LLCin group WOLVERINE ASSET MANAGEMENT LLC51,942$1.35M0.02%-16,09813F-HRTimelineGroup
HAHN CAPITAL MANAGEMENT LLC51,120$1.33M0.84%-10,84213F-HRTimeline
Lido Advisors, LLCin group Lido Advisors, LLC50,345$1.31M0.01%+40,49613F-HRTimelineGroup
Advisors Asset Management, Inc.50,028$1.3M0.02%+28,95013F-HRTimeline
VICTORY CAPITAL MANAGEMENT INC49,825$1.3M<0.01%+2,82913F-HRTimeline
BLAIR WILLIAM & CO/IL49,298$1.29M<0.01%-30,66713F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…47,842$1.25M<0.01%-1,39013F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC46,815$1.22M<0.01%-3,56013F-HRTimelineGroup
MAVERICK CAPITAL LTD46,335$1.21M0.01%new13F-HRTimeline
State of Tennessee, Department of Treas…46,262$1.21M<0.01%013F-HRTimeline
Hikari Tsushin, Inc.45,403$1.18M0.08%013F-HRTimeline
Steadtrust LLC45,400$1.18M0.67%-5,00013F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM43,541$1.14M0.01%-31913F-HRTimeline
Dynamic Technology Lab Private Ltd43,245$1.13M0.18%+12,38213F-HRTimeline
Paragon Capital Management LLC43,158$1.13M0.56%-57213F-HRTimeline
CWM, LLCin group CWM, LLC42,637$1.11M<0.01%-1,97713F-HRTimelineGroup
Cerity Partners LLCin group Cerity Partners LLC42,449$1.11M<0.01%-9,24513F-HRTimelineGroup
Zurcher Kantonalbank (Zurich Cantonalba…40,963$1.07M<0.01%+7,52513F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …40,917$1.07M<0.01%+3,99813F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC40,671$1.06M<0.01%-38,33713F-HRTimelineGroup
LANDSCAPE CAPITAL MANAGEMENT, L.L.C.in group LANDSCAPE CAPITAL MANAGEMENT,…40,393$1.05M0.07%+7,41213F-HRTimelineGroup
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCH…38,004$991K0.01%+5313F-HRTimeline
DELPHI MANAGEMENT INC /MA/37,873$988K1.18%-11,22113F-HRTimeline
YOUSIF CAPITAL MANAGEMENT, LLC37,852$987K0.01%-23913F-HRTimeline
TEACHERS RETIREMENT SYSTEM OF THE STATE…37,772$985K0.01%013F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP37,676$974K<0.01%+1,39213F-HRTimelineGroup
NISA INVESTMENT ADVISORS, LLC36,229$945K<0.01%+47313F-HRTimeline
TOWER BRIDGE ADVISORS35,698$931K0.09%+1,51613F-HRTimeline
WEXFORD CAPITAL LP35,486$925K0.15%+27,23513F-HRTimeline
OREGON PUBLIC EMPLOYEES RETIREMENT FUND35,100$915K0.01%013F-HRTimeline
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …34,641$903K<0.01%+1,41713F-HRTimelineGroup
Clear Harbor Asset Management, LLC33,775$881K0.06%-2,50013F-HRTimeline
FOX RUN MANAGEMENT, L.L.C.33,939$854K0.15%+26,69113F-HRTimeline
Williams Jones Wealth Management, LLC.32,515$848K0.01%-2,97713F-HRTimeline
Walleye Capital LLCgroup of 2 filers holding32,375$844K+32,264Timeline
CAPTRUST FINANCIAL ADVISORS31,929$832K<0.01%-613F-HRTimeline
DBA TRADING, LLC31,196$814K0.4%013F-HRTimeline
Maryland State Retirement & Pension Sys…29,838$778K0.02%-7513F-HRTimeline
Corient Private Wealth LPin group Corient Private Wealth LP29,533$769K<0.01%-7,41613F-HRTimelineGroup
Kerrisdale Advisers, LLC29,190$761K0.29%new13F-HRTimeline
Wilmington Savings Fund Society, FSB29,138$760K0.02%+2,26913F-HRTimeline
Legal Advantage Investments, Inc.28,900$754K0.39%+10,00013F-HRTimeline
PICTON MAHONEY ASSET MANAGEMENT27,235$710K0.01%+27,22713F-HRTimeline
National Philanthropic Trust27,066$706K0.01%-37113F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.27,063$706K<0.01%-2,06313F-HRTimelineGroup
Entropy Technologies, LP26,895$701K0.03%new13F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…26,893$701K<0.01%+1,64113F-HRTimelineGroup
SIT INVESTMENT ASSOCIATES INCin group SIT INVESTMENT ASSOCIATES INC26,202$683K0.01%013F-HRTimelineGroup
SECURITY NATIONAL BANK OF SO DAK26,129$681K0.33%-51313F-HRTimeline
Cetera Investment Advisers24,375$636K<0.01%+3,10113F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\24,277$633K<0.01%-1,32313F-HRTimelineGroup
Peak Asset Management, LLC24,000$626K0.11%013F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd23,787$620K0.01%-21,03413F-HRTimelineGroup
STEPHENS INC /AR/in group Stephens Investment Managemen…23,395$610K0.01%+84013F-HRTimelineGroup
Atom Investors LP22,815$595K0.04%-20,92213F-HRTimeline
TOTH FINANCIAL ADVISORY CORP22,355$583K0.06%+6,66513F-HRTimeline
STIFEL FINANCIAL CORPin group STIFEL FINANCIAL CORP21,935$572K<0.01%-8,61513F-HRTimelineGroup
NEVILLE RODIE & SHAW INC21,810$569K0.04%-2,11813F-HRTimeline
Pathstone Holdings, LLCin group Pathstone Holdings, LLC21,794$568K<0.01%-10,13213F-HRTimelineGroup
Old West Investment Management, LLC21,767$568K0.06%+2,41213F-HRTimeline
Caption Management, LLC21,722$567K0.03%-94,77813F-HRTimeline
DOVER ADVISORS, LLC21,161$552K0.23%-1,05813F-HRTimeline
Massar Capital Management, LP21,056$549K0.11%new13F-HRTimeline
ARISTEIA CAPITAL, L.L.C.20,605$537K0.01%new13F-HRTimeline
NEUBERGER BERMAN GROUP LLCin group NEUBERGER BERMAN GROUP LLC20,551$536K<0.01%+1,67713F-HRTimelineGroup
LATHROP INVESTMENT MANAGEMENT CO20,044$523K0.1%-27013F-HRTimeline
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/19,966$521K<0.01%+55713F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\19,854$518K<0.01%-1,32113F-HRTimelineGroup