Calamos Advisors LLC — 13F Holdings & Portfolio

CIK 1316507 · latest 13F-HR filed 2026-07-31

Calamos Advisors LLC manages $30.07B in 13F-reported U.S. long-equity assets across 1,059 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are NVDA (4.70%), AAPL (3.78%), CBOX (3.58%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 159 new positions and exited 361; 305 existing positions rose in reported value and 261 fell.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

AUM

$30.07B

Long-equity book

Holdings

1,059

Distinct positions

Period

2026-06-30

Filed 2026-07-31

Q/Q Activity

+159 / −361 / ↑305 / ↓261

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26

NVDA5.1% · -14%AAPL4.1% · -18%CBOX3.9% · new WDC3.0% · -12%MSFT2.8% · -14%GOOGL2.6% · -21%AMZN2.6% · -12%AVGO1.9% · -17%META1.3% · -10%MU1.3% · -3%LLY1.2% · -8%GOOG1.2% · -9%AMD1.1% · +13%TSLA1.1% · -11%GOOGM0.9% · new AKAM0.8% · +76%GOOGN0.8% · new JPM0.8% · -12%V0.8% · -13%BABAF0.8% · 0%AMAT0.8% · -1%ON0.7% · -1%BAPA0.7% · -4%SNOW0.7% · -0%HPEPC0.7% · +14%ORCLPD0.6% · -3%INTC0.6% · +30%RIVN0.6% · -0%GS0.6% · -3%JNJ0.6% · -16%CAT0.6% · +12%LRCX0.6% · -12%XOM0.6% · -11%WMT0.6% · -13%ETSY0.5% · +105%MKSI0.5% · -35%GEV0.5% · -19%MHIFF0.5% · -29%CSCO0.5% · +2%WEC0.5% · +48%UNH0.5% · +23%DASH0.5% · new BRK.B0.5% · -8%BAC0.5% · -4%MA0.4% · -4%UBER0.4% · +13%PSAPF0.4% · new CYBR0.4% · new WFC0.4% · -19%MCHPP0.4% · -22%PPLC0.4% · 0%LIN0.4% · -8%PM0.4% · -2%SOMN0.4% · +2%GE0.4% · -4%DDOG0.4% · +22%C0.4% · +0%NEEPV0.4% · -0%ABBV0.4% · -17%NFLX0.4% · -21%

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

3 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 28.6%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

Assets Under Management

$43.89B

Discretionary

$43.89B

Employees

300

Accounts

1,957

Address

2020 CALAMOS COURT
NAPERVILLE, IL 60563-2787

Phone

(630) 245-7200

Website

WWW.LINKEDIN.COM/COMPANY/CALAMOS-INVESTMENTS
WWW.CALAMOS.COM
X.COM/CALAMOS

Name	Title / Status	Ownership	Type
CALAMOS ASSET MANAGEMENT, INC. Control	SOLE MANAGER/MEMBER	General partner	Domestic Entity
CALAMOS FAMILY PARTNERS, INC. Control	MEMBER	75% or more	Domestic Entity
CALAMOS INVESTMENTS LLC Control	SOLE MEMBER/MANAGER	75% or more	Domestic Entity
CALAMOS PARTNERS LLC Control	MEMBER	75% or more	Domestic Entity
CALAMOS SR., JOHN, PETER Control	FOUNDER, CHAIRMAN AND GLOBAL CIO	Less than 5%	Individual
CALAMOS SR., JOHN, PETER Control	TRUSTEE AND SHAREHOLDER	75% or more	Individual
CALAMOS SR., JOHN, PETER Control	MANAGER	General partner	Individual
CALAMOS SR., JOHN, PETER Control	SHAREHOLDER	50–75%	Individual
Dufresne, Daniel, Leo Control	EVP, CHIEF OPERATING OFFICER	Less than 5%	Individual
Herman, Thomas, Edward Control	EVP, CHIEF FINANCIAL OFFICER	Less than 5%	Individual
JOHN P. CALAMOS, TRUSTEE, UNDER THE JOHN P. CALAMOS 1985 TRUST Control	SHAREHOLDER	75% or more	Domestic Entity
KOUDOUNIS, JOHN, SPIRO Control	PRESIDENT AND CHIEF EXECUTIVE OFFICER	Less than 5%	Individual
KOUDOUNIS, JOHN, SPIRO Control	MANAGER	General partner	Individual
KOUDOUNIS, JOHN, SPIRO Control	SHAREHOLDER	25–50%	Individual
Kiley, Thomas, Patrick Control	SVP, CHIEF DISTRIBUTION OFFICER	Less than 5%	Individual
Ojala, Erik, Donald Control	SVP GENERAL COUNSEL & SECRETARY	Less than 5%	Individual
TAKAHASHI, WILLIAM, J Control	MANAGER	General partner	Individual
Kelly, Walter, Morrissey	SVP, CHIEF COMPLIANCE OFFICER	Less than 5%	Individual

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

Top Adds (vs prior quarter)

WESTERN DIGITAL CORP$426.2M +106.8%
MICRON TECHNOLOGY INC$253.0M +232.4%
ADVANCED MICRO DEVICES INC$216.9M +223.1%
INTEL CORP$134.1M +311.6%
APPLIED MATLS INC$114.4M +109.0%

Show all 305 →

Top Trims

STATE STR SPDR S&P 500 ETF T-$448.6M -97.8%
ISHARES TR-$167.6M -93.9%
ISHARES TR-$126.5M -95.7%
ISHARES TR-$125.6M -96.1%
MICROSOFT CORP-$116.5M -13.2%

Show all 261 →

New Positions

Show all 159 →

Exited Positions

WAYFAIR INC$102.8M
DUKE ENERGY CORP NEW$86.5M
LUMENTUM HLDGS INC$84.5M
BLOOM ENERGY CORP$79.1M
ISHARES TR$57.1M

Show all 361 →

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#	Issuer	Symbol	CUSIP	Value	Δ

Calamos Advisors LLC Holdings (2026-06-30)

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

#	Issuer	Symbol	CUSIP	Value	Weight	Shares	Type
1	NVIDIA CORPORATION	NVDA	67066G104	$1.41B	4.70%	7,059,874	SH
2	APPLE INC	AAPL	037833100	$1.14B	3.78%	3,925,539	SH
3	CALAMOS ETF TR	CBOX	12811T514	$1.08B	3.58%	10,693,254	SH
4	WESTERN DIGITAL CORP	WDC	958102AT2	$825.1M	2.74%	48,728,000	PRN
5	STATE STR SPDR S&P 500 ETF T Put	SPY	78462F103	$810.8M	2.70%	1,246,800	SH
6	MICROSOFT CORP	MSFT	594918104	$762.8M	2.54%	2,045,038	SH
7	ALPHABET INC	GOOGL	02079K305	$721.7M	2.40%	2,019,467	SH
8	AMAZON COM INC	AMZN	023135106	$713.0M	2.37%	2,991,600	SH
9	STATE STR SPDR S&P 500 ETF T Call	SPY	78462F103	$554.9M	1.85%	853,300	SH
10	BROADCOM INC	AVGO	11135F101	$519.3M	1.73%	1,374,612	SH
11	META PLATFORMS INC	META	30303M102	$370.4M	1.23%	657,623	SH
12	MICRON TECHNOLOGY INC	MU	595112103	$361.8M	1.20%	313,454	SH
13	ELI LILLY & CO	LLY	532457108	$339.4M	1.13%	283,001	SH
14	ALPHABET INC	GOOG	02079K107	$320.5M	1.07%	907,212	SH
15	ADVANCED MICRO DEVICES INC	AMD	007903107	$314.1M	1.04%	540,770	SH
16	TESLA INC	TSLA	88160R101	$314.0M	1.04%	746,440	SH
17	ALPHABET INC	GOOGM	02079K404	$237.3M	0.79%	4,662,875	SH
18	ALPHABET INC	GOOGN	02079K602	$232.2M	0.77%	4,615,868	SH
19	JPMORGAN CHASE & CO	JPM	46625H100	$231.9M	0.77%	708,384	SH
20	VISA INC	V	92826C839	$226.9M	0.75%	661,467	SH
21	ALIBABA GROUP HLDG LTD	BABAF	01609WBG6	$223.2M	0.74%	189,049,000	PRN
22	APPLIED MATLS INC	AMAT	038222105	$219.4M	0.73%	303,395	SH
23	INVESCO QQQ TR Put	QQQ	46090E103	$197.2M	0.66%	341,600	SH
24	BOEING CO	BAPA	097023204	$185.4M	0.62%	2,754,965	SH
25	HEWLETT PACKARD ENTERPRISE C	HPEPC	42824C208	$183.5M	0.61%	1,586,652	SH
26	ORACLE CORP	ORCLPD	68389X204	$178.8M	0.59%	3,976,804	SH
27	INTEL CORP	INTC	458140100	$177.1M	0.59%	1,268,305	SH
28	ISHARES TR Call	EFA	464287465	$168.0M	0.56%	1,730,000	SH
29	GOLDMAN SACHS GROUP INC	GS	38141G104	$167.6M	0.56%	165,711	SH
30	JOHNSON & JOHNSON	JNJ	478160104	$164.4M	0.55%	647,222	SH
31	CATERPILLAR INC	CAT	149123101	$160.0M	0.53%	150,261	SH
32	LAM RESEARCH CORP	LRCX	512807306	$158.4M	0.53%	365,435	SH
33	EXXON MOBIL CORP	XOM	30231G102	$155.3M	0.52%	1,135,866	SH
34	WALMART INC	WMT	931142103	$154.4M	0.51%	1,362,951	SH
35	MKS INC.	MKSI	55306NAB0	$149.9M	0.50%	50,767,000	PRN
36	SNOWFLAKE INC	SNOW	833445AD1	$148.4M	0.49%	83,995,000	PRN
37	ON SEMICONDUCTOR CORP	ON	682189AU9	$147.7M	0.49%	122,336,000	PRN
38	GE VERNOVA INC	GEV	36828A101	$145.3M	0.48%	123,656	SH
39	CISCO SYS INC	CSCO	17275R102	$138.5M	0.46%	1,178,914	SH
40	UNITEDHEALTH GROUP INC	UNH	91324P102	$128.6M	0.43%	309,379	SH
41	DOORDASH INC	DASH	25809KAB1	$126.4M	0.42%	128,612,000	PRN
42	BERKSHIRE HATHAWAY INC DEL	BRK.B	084670702	$126.3M	0.42%	252,430	SH
43	BANK OF AMER CORP	BAC	060505104	$125.8M	0.42%	2,207,262	SH
44	MASTERCARD INCORPORATED	MA	57636Q104	$122.7M	0.41%	238,960	SH
45	CLOUDFLARE INC	NET	18915MAF4	$121.0M	0.40%	95,422,000	PRN
46	CYBERARK SOFTWARE LTD	CYBR	23248VAD7	$120.7M	0.40%	72,437,000	PRN
47	AKAMAI TECHNOLOGIES INC	AKAM	00971TAQ4	$114.3M	0.38%	78,152,000	PRN
48	WELLS FARGO & CO	WFC	949746101	$112.9M	0.38%	1,366,153	SH
49	MICROCHIP TECHNOLOGY INC.	MCHPP	595017302	$111.9M	0.37%	1,458,634	SH
50	PPL CORP	PPLC	69351T866	$109.7M	0.36%	2,236,184	SH

Filing History

Period	Filed	AUM	Holdings	Accession
2026-06-30	2026-07-31	$30.07B	1,059	0001316507-26-000003
2026-03-31	2026-05-04	$28.22B	1,269	0001316507-26-000002
2025-12-31	2026-01-29	$26.63B	997	0001316507-26-000001

Filer Information

Address

2020 CALAMOS COURT
NAPERVILLE, IL 60563

Phone

(630) 245-1046

Filing Manager

Calamos Advisors LLC

NAPERVILLE, IL

Signatory

Jacqueline Sinker

SVP, CHIEF COMPLIANCE OFFICER