Institutional manager

Calamos Advisors LLC

Holds positions in 339 of the S&P 500, worth $16.4bn as reported for the quarter ended 31-mar-2026.

Positions held339of 488 index companies covered

Reported value$16.4bnS&P 500 positions only

Top ten weight43%how concentrated the book is

Filing entities1single filer

Largest positions

The 60 biggest by reported value, of 339 held. The rest are smaller than every one of these.

NvidiaNVDA8.2m$1.43bnInformation Technology Apple Inc.AAPL4.8m$1.21bnInformation Technology Alphabet Inc. (Class A)GOOGL3.6m$1.02bnCommunication Services MicrosoftMSFT2.4m$879mInformation Technology AmazonAMZN3.4m$709mConsumer Discretionary BroadcomAVGO1.7m$511mInformation Technology Meta PlatformsMETA730,902$418mCommunication Services Tesla, Inc.TSLA841,450$313mConsumer Discretionary Lilly (Eli)LLY308,497$284mHealth Care JPMorgan ChaseJPM804,936$237mFinancials Visa Inc.V761,893$230mFinancials ExxonMobilXOM1.3m$218mEnergy WalmartWMT1.6m$195mConsumer Staples Johnson & JohnsonJNJ773,100$189mHealth Care NetflixNFLX1.7m$168mCommunication Services Goldman SachsGS170,881$145mFinancials Chevron CorporationCVX691,326$143mEnergy Berkshire HathawayBRK.B273,865$134mFinancials Wells FargoWFC1.7m$134mFinancials GE VernovaGEV152,890$133mIndustrials MastercardMA248,453$124mFinancials Bank of AmericaBAC2.3m$112mFinancials Linde plcLIN225,271$112mMaterials Micron TechnologyMU322,206$109mInformation Technology Palantir TechnologiesPLTR741,654$108mInformation Technology Home Depot (The)HD328,049$108mConsumer Discretionary AbbVieABBV483,670$105mHealth Care Applied MaterialsAMAT307,090$105mInformation Technology Philip Morris InternationalPM592,924$98mConsumer Staples Advanced Micro DevicesAMD477,928$97mInformation Technology RTX CorporationRTX503,016$97mIndustrials Caterpillar Inc.CAT134,683$95mIndustrials Merck & Co.MRK777,663$94mHealth Care CostcoCOST91,006$91mConsumer Staples CiscoCSCO1.2m$90mInformation Technology Lam ResearchLRCX413,151$88mInformation Technology Morgan StanleyMS535,714$88mFinancials CitigroupC733,611$83mFinancials GE AerospaceGE288,935$82mIndustrials Marathon PetroleumMPC319,159$78mEnergy American ExpressAXP253,116$77mFinancials Intuitive SurgicalISRG165,835$76mHealth Care Coca-Cola Company (The)KO999,207$76mConsumer Staples Lowe'sLOW314,574$74mConsumer Discretionary TJX CompaniesTJX457,769$73mConsumer Discretionary Procter & GamblePG498,687$72mConsumer Staples Chubb LimitedCB218,874$71mFinancials CSX CorporationCSX1.7m$71mIndustrials Norfolk SouthernNSC244,559$70mIndustrials BoeingBA346,104$69mIndustrials Thermo Fisher ScientificTMO139,230$68mHealth Care Union Pacific CorporationUNP280,779$68mIndustrials UnitedHealth GroupUNH250,888$68mHealth Care Arista NetworksANET526,164$65mInformation Technology Oracle CorporationORCL416,081$61mInformation Technology Sherwin-WilliamsSHW187,949$60mMaterials Quanta ServicesPWR108,501$60mIndustrials UberUBER820,402$59mIndustrials KenvueKVUE3.4m$58mConsumer Staples Gilead SciencesGILD412,590$58mHealth Care

What this page is not

Positions in the companies this site covers, from 13F filings, which report US listed, long, US custodied holdings. A manager's real book is larger than this in every case: anything outside the index, outside US custody, held through derivatives, or below its reporting obligation is not here.