Cornerstone Select Advisors, LLC — 13F Holdings & Portfolio

CIK 2055366 · latest 13F-HR filed 2026-08-05

Cornerstone Select Advisors, LLC manages $237.6M in 13F-reported U.S. long-equity assets across 149 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are MU (6.91%), LRCX (5.43%), AVGO (4.99%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 31 new positions and exited 6; 91 existing positions rose in reported value and 13 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

$237.6M

Long-equity book

Holdings

149

Distinct positions

Period

2026-06-30

Filed 2026-08-05

Q/Q Activity

+31 / −6 / ↑91 / ↓13

vs 2026-03-31

Portfolio charts

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

Portfolio map

Q2 26

MU6.9% · +9%LRCX5.4% · +27%AVGO5.0% · +10%NVDA3.6% · +3%KLAC3.2% · +984%AAPL2.4% · +13%VRT2.1% · +12%DELL2.0% · +30%PANW1.9% · +12%CRWD1.8% · +12%CAH1.8% · +9%CSCO1.7% · +9%CVX1.7% · +22%BAC1.7% · +8%SMH1.5% · -2%VLO1.5% · +26%PLTR1.4% · +38%GLW1.4% · +0%ABBV1.4% · +18%MRK1.4% · +12%ARCC1.3% · +5%ANET1.3% · +15%AMZN1.3% · +13%T1.3% · +10%MSFT1.3% · +12%EPD1.2% · +20%WCC1.1% · +3%GOOGL1.1% · +10%CRDO1.1% · +18%WMT1.0% · +14%AMD1.0% · +11%GILD1.0% · +20%META1.0% · +14%IBM1.0% · +15%SHEL0.9% · +4%TGTX0.9% · -14%HPE0.9% · +14%CAT0.9% · +9%VZ0.9% · +5%TSM0.9% · -2%MO0.9% · +28%ORCL0.8% · +13%LHX0.8% · +1%ASML0.8% · +38%TMHC0.7% · +7%AMGN0.7% · +8%EME0.7% · +76%CDNS0.7% · +13%COHR0.7% · +94%UGI0.6% · +5%HSBC0.6% · +12%TFC0.6% · +18%OHI0.6% · +20%V0.5% · -0%XLI0.5% · +14%VFH0.5% · +0%CMI0.5% · +60%STLD0.5% · +40%ALL0.5% · 0%XOM0.5% · +16%

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

4 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 = 34.5%

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

Firm Profile & Key People

As of the firm’s regulatory filing dated Apr 2, 2026.

Assets Under Management

$315.3M

Discretionary

$209.0M

Employees

Accounts

790

Address

13171 OLIVE BOULEVARD
SUITE 302
ST. LOUIS, MO 63141

Phone

(314) 862-5155

Website

WWW.CSASTL.COM

This firm reports 3 disclosure items on its registration.

Name	Title / Status	Ownership	Type
GUSTUS, DOYLE, EDWIN Control	MANAGING MEMBER since Oct 2009	75% or more	Individual
GUSTUS, BYRON, WADE	CHIEF FINANCIAL OFFICER since Feb 2022	Less than 5%	Individual
SADZEWICZ, GERY, JOSEPH	CCO since Oct 2009	Less than 5%	Individual

Ownership & leadership changes · 1 filing with changes since May 21, 2018

From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.

Sep 6, 2022 filing

AddedGUSTUS, BYRON, WADE · CHIEF FINANCIAL OFFICER · Less than 5%

May 21, 2018 filing (earliest on record)

ListedGUSTUS, DOYLE, EDWIN · MANAGING MEMBER · 75% or more · control person
ListedSADZEWICZ, GERY, JOSEPH · CCO · Less than 5%

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)

MICRON TECHNOLOGY INC$12.0M +271.2%
LAM RESEARCH CORP$7.9M +157.7%
KLA CORP$4.2M +122.2%
DELL TECHNOLOGIES INC$3.4M +241.7%
BROADCOM INC$3.0M +33.9%

Show all 91 →

Top Trims

AT&T INC-$822.7K -21.4%
LEIDOS HOLDINGS INC-$391.9K -42.3%
SHELL PLC-$341.1K -13.2%
L3HARRIS TECHNOLOGIES INC-$319.4K -14.7%
VERIZON COMMUNICATIONS INC-$284.8K -11.8%

Show all 13 →

New Positions

Show all 31 →

Exited Positions

Show all 6 →

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#	Issuer	Symbol	CUSIP	Value	Δ

Cornerstone Select Advisors, LLC Holdings (2026-06-30)

#	Issuer	Symbol	CUSIP	Value	Weight	Shares	Type
1	MICRON TECHNOLOGY INC	MU	595112103	$16.4M	6.91%	14,227	SH
2	LAM RESEARCH CORP	LRCX	512807306	$12.9M	5.43%	29,766	SH
3	BROADCOM INC	AVGO	11135F101	$11.9M	4.99%	31,375	SH
4	NVIDIA CORPORATION	NVDA	67066G104	$8.6M	3.64%	43,208	SH
5	KLA CORP	KLAC	482480100	$7.7M	3.25%	25,598	SH
6	APPLE INC	AAPL	037833100	$5.7M	2.41%	19,752	SH
7	VERTIV HOLDINGS CO	VRT	92537N108	$5.1M	2.15%	15,234	SH
8	DELL TECHNOLOGIES INC	DELL	24703L202	$4.9M	2.05%	11,283	SH
9	PALO ALTO NETWORKS INC	PANW	697435105	$4.5M	1.88%	13,105	SH
10	CROWDSTRIKE HLDGS INC	CRWD	22788C105	$4.4M	1.85%	5,754	SH
11	CARDINAL HEALTH INC	CAH	14149Y108	$4.4M	1.85%	18,456	SH
12	CISCO SYS INC	CSCO	17275R102	$4.1M	1.73%	34,903	SH
13	CHEVRON CORPORATION	CVX	166764100	$4.0M	1.69%	24,286	SH
14	BANK OF AMER CORP	BAC	060505104	$3.9M	1.65%	68,933	SH
15	VANECK ETF TRUST	SMH	92189F676	$3.6M	1.50%	5,443	SH
16	VALERO ENERGY CORP	VLO	91913Y100	$3.5M	1.46%	13,285	SH
17	PALANTIR TECHNOLOGIES INC	PLTR	69608A108	$3.4M	1.44%	29,272	SH
18	CORNING INC	GLW	219350105	$3.4M	1.42%	13,246	SH
19	ABBVIE INC	ABBV	00287Y109	$3.3M	1.40%	13,222	SH
20	MERCK & CO INC	MRK	58933Y105	$3.3M	1.38%	25,523	SH
21	ARES CAPITAL CORP	ARCC	04010L103	$3.2M	1.34%	171,613	SH
22	ARISTA NETWORKS INC	ANET	040413205	$3.1M	1.32%	18,523	SH
23	AMAZON COM INC	AMZN	023135106	$3.1M	1.30%	12,996	SH
24	AT&T INC	T	00206R102	$3.0M	1.27%	145,746	SH
25	MICROSOFT CORP	MSFT	594918104	$3.0M	1.26%	8,019	SH
26	ENTERPRISE PRODS PARTNERS L	EPD	293792107	$2.9M	1.24%	80,102	SH
27	WESCO INTL INC	WCC	95082P105	$2.6M	1.09%	7,469	SH
28	ALPHABET INC	GOOGL	02079K305	$2.5M	1.07%	7,122	SH
29	CREDO TECHNOLOGY GROUP HOLDI	CRDO	G25457105	$2.5M	1.06%	9,239	SH
30	WALMART INC	WMT	931142103	$2.4M	1.02%	21,447	SH
31	ADVANCED MICRO DEVICES INC	AMD	007903107	$2.4M	1.00%	4,091	SH
32	GILEAD SCIENCES INC	GILD	375558103	$2.4M	1.00%	18,744	SH
33	META PLATFORMS INC	META	30303M102	$2.3M	0.98%	4,140	SH
34	INTERNATIONAL BUSINESS MACHS	IBM	459200101	$2.3M	0.98%	8,293	SH
35	SHELL PLC	SHEL	780259305	$2.2M	0.94%	28,955	SH
36	TG THERAPEUTICS INC	TGTX	88322Q108	$2.2M	0.93%	40,217	SH
37	HEWLETT PACKARD ENTERPRISE C	HPE	42824C109	$2.2M	0.92%	48,654	SH
38	CATERPILLAR INC	CAT	149123101	$2.2M	0.91%	2,028	SH
39	VERIZON COMMUNICATIONS INC	VZ	92343V104	$2.1M	0.90%	50,240	SH
40	TAIWAN SEMICONDUCTOR MANUFAC	TSM	874039100	$2.0M	0.86%	4,282	SH
41	ALTRIA GROUP INC	MO	02209S103	$2.0M	0.85%	28,195	SH
42	ORACLE CORP	ORCL	68389X105	$2.0M	0.83%	13,476	SH
43	L3HARRIS TECHNOLOGIES INC	LHX	502431109	$1.9M	0.78%	6,401	SH
44	ASML HLDG NV	ASML	N07059210	$1.8M	0.78%	928	SH
45	TAYLOR MORRISON HOME CORP	TMHC	87724P106	$1.7M	0.72%	23,961	SH
46	AMGEN INC	AMGN	031162100	$1.7M	0.72%	4,743	SH
47	EMCOR GROUP INC	EME	29084Q100	$1.7M	0.71%	2,046	SH
48	CADENCE DESIGN SYSTEM INC	CDNS	127387108	$1.7M	0.71%	4,506	SH
49	COHERENT CORP	COHR	19247G107	$1.7M	0.70%	4,225	SH
50	UGI CORP NEW	UGI	902681105	$1.5M	0.61%	42,218	SH

Filing History

Period	Filed	AUM	Holdings	Accession
2026-06-30	2026-08-05	$237.6M	149	0001104659-26-091031
2026-03-31	2026-05-13	$159.7M	124	0001104659-26-060022
2025-12-31	2026-02-10	$144.1M	117	0001104659-26-012390
2025-09-30	2025-11-14	$136.0M	110	0001104659-25-112068

Filer Information

Address

13171 OLIVE BOULEVARD
SUITE 302
ST. LOUIS, MO 63141

Phone

(314) 862-5155

Filing Manager

Cornerstone Select Advisors, LLC

ST. LOUIS, MO

Signatory

Byron Gustus

Chief Financial Officer