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CenterStar Asset Management, LLC — 13F Holdings & Portfolio

CIK 1722053 · latest 13F-HR filed 2026-10-09

Backtest portfolio

CenterStar Asset Management, LLC manages $425.5M in 13F-reported U.S. long-equity assets across 216 reported positions as of its 2026-09-30 13F-HR filing. Its largest disclosed positions are QQQ (28.22%), TSLA (4.66%), SNDK (2.74%). Quarter over quarter (versus its 2026-06-30 filing) the fund opened 32 new positions and exited 32; 7 existing positions rose in reported value and 9 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.

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AUM
$425.5M

Long-equity book

Holdings
216

Distinct positions

Period
2026-09-30

Filed 2026-10-09

Q/Q Activity
+32 / −32 / ↑7 / ↓9

vs 2026-06-30

Portfolio charts

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

Portfolio map

Q3 26
NVDA12.6% · +37%TSLA9.3% · +35%NBIS7.1% · +149%WDC6.5% · newTXN6.1% · newSTX5.8% · newKLAC5.6% · newDELL3.8% · newAAPL3.4% · +20%HPE3.4% · newMETA2.7% · -74%BX2.4% · newBA2.3% · +73%UPS2.2% · newUSO1.9% · +9%CSCO1.9% · newINTC1.8% · newTSM1.6% · -60%QQQ1.5% · newSLV1.4% · newEXPE1.3% · newKKR1.3% · newCIEN1.2% · -43%PCG1.2% · newAVGO0.9% · -20%ROKU0.8% · -42%MAGS0.7% · newSNDK0.7% · newAMD0.7% · -57%GOOGL0.6% · +86%OXY0.6% · newEFC0.5% · 0%XLV0.5% · newALC0.5% · newSMH0.5% · newPZZA0.4% · newGTLB0.4% · newLRCX0.4% · newCB0.4% · newXLU0.4% · newETN0.4% · newSWK0.4% · newHD0.4% · newIREN0.3% · newCHWY0.3% · newNMFC0.3% · 0%TTD0.2% · newPTLO0.2% · +17%PAYO0.1% · -4%REKR0.0% · 0%

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

Q2 26 → Q3 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 = 63.7%

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

Firm Profile & Key People

As of the firm’s regulatory filing dated Mar 24, 2026.

Assets Under Management
$138.6M
Discretionary
$138.6M
Employees
8
Accounts
3
Address
300 SOUTH RIVERSIDE PLAZA
SUITE 2350
CHICAGO, IL 60606
Phone
(312) 256-9627
This firm reports 1 disclosure item on its registration.
Name Title / Status Ownership Type
CORBY, BRIAN, ANTHONY ControlCHIEF COMPLIANCE OFFICER
since Jul 2017
Less than 5%Individual
SLONEKER, MICHELIN, ALDRIDGE ControlCHIEF OPERATING OFFICER
since Jul 2017
Less than 5%Individual
SPIDERROCK HOLDINGS, LLC ControlMANAGER
since Jul 2014
75% or moreDomestic Entity
PAPA, GEORGE, ORSON Control
Indirect owner via SPIDERROCK HOLDINGS, LLC
MANAGING MEMBER
since Jan 2013
75% or moreIndividual
Ownership & leadership changes · 2 filings with changes since Aug 31, 2017

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.

Feb 18, 2020 filing
  • ChangedPAPA, GEORGE, ORSON · indirect via SPIDERROCK HOLDINGS, LLC: ownership 50–75% → 75% or more
Mar 14, 2019 filing
  • No longer listedPAPA, GEORGE, ORSON · MANAGING MEMBER · Less than 5% · control person · listed since Jul 2014
  • ChangedSPIDERROCK HOLDINGS, LLC · title OWNER → MANAGER
Aug 31, 2017 filing (earliest on record)
  • ListedCORBY, BRIAN, ANTHONY · CHIEF COMPLIANCE OFFICER · Less than 5% · control person
  • ListedPAPA, GEORGE, ORSON · MANAGING MEMBER · 50–75% · indirect via SPIDERROCK HOLDINGS, LLC · control person
  • ListedPAPA, GEORGE, ORSON · MANAGING MEMBER · Less than 5% · control person
  • ListedSLONEKER, MICHELIN, ALDRIDGE · CHIEF OPERATING OFFICER · Less than 5% · control person
  • ListedSPIDERROCK HOLDINGS, LLC · OWNER · 75% or more · control person

Quarter-over-quarter changes

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

CenterStar Asset Management, LLC Holdings (2026-09-30)

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 INVESCO QQQ TR Put QQQ 46090E103 $120.1M 28.22% 162,300 SH
2 TESLA INC Put TSLA 88160R101 $19.8M 4.66% 55,900 SH
3 SANDISK CORP Put SNDK 80004C200 $11.7M 2.74% 6,700 SH
4 MARVELL TECHNOLOGY INC Call MRVL 573874104 $10.2M 2.39% 38,500 SH
5 NVIDIA CORPORATION NVDA 67066G104 $8.0M 1.87% 34,698 SH
6 VANECK ETF TRUST Put SMH 92189F676 $7.7M 1.80% 12,600 SH
7 UNITED STS OIL FD LP Put USO 91232N207 $7.6M 1.80% 52,500 SH
8 SANDISK CORP Call SNDK 80004C200 $7.3M 1.72% 4,200 SH
9 NVIDIA CORPORATION Put NVDA 67066G104 $6.4M 1.51% 28,200 SH
10 META PLATFORMS INC Put META 30303M102 $5.9M 1.40% 8,200 SH
11 TESLA INC TSLA 88160R101 $5.9M 1.39% 16,694 SH
12 INVESCO QQQ TR Call QQQ 46090E103 $5.5M 1.29% 7,400 SH
13 MARVELL TECHNOLOGY INC Put MRVL 573874104 $5.4M 1.27% 20,500 SH
14 KROGER CO Call KR 501044101 $5.3M 1.24% 90,300 SH
15 TAIWAN SEMICONDUCTOR MANUFAC Put TSM 874039100 $4.8M 1.14% 10,600 SH
16 NEBIUS GROUP N.V. NBIS N97284108 $4.5M 1.06% 19,147 SH
17 ISHARES SILVER TR Put SLV 46428Q109 $4.1M 0.97% 76,000 SH
18 WESTERN DIGITAL CORP WDC 958102105 $4.1M 0.97% 9,048 SH
19 ORACLE CORP Put ORCL 68389X105 $4.0M 0.94% 29,200 SH
20 TEXAS INSTRS INC TXN 882508104 $3.9M 0.91% 13,781 SH
21 SEAGATE TECHNOLOGY HLDNGS PL STX G7997R103 $3.7M 0.87% 3,990 SH
22 KLA CORP KLAC 482480100 $3.5M 0.83% 17,955 SH
23 ZSCALER INC Call ZS 98980G102 $3.3M 0.77% 16,500 SH
24 VANECK ETF TRUST Call SMH 92189F676 $3.2M 0.74% 5,200 SH
25 INVESCO EXCHANGE TRADED FD T Call RSP 46137V357 $3.1M 0.73% 15,000 SH
26 ORACLE CORP Call ORCL 68389X105 $2.9M 0.68% 21,200 SH
27 APPLE INC Put AAPL 037833100 $2.9M 0.68% 8,700 SH
28 ZSCALER INC Put ZS 98980G102 $2.9M 0.68% 14,500 SH
29 EXPEDIA GROUP INC Put EXPE 30212P303 $2.8M 0.66% 10,700 SH
30 BROADCOM INC Put AVGO 11135F101 $2.5M 0.59% 7,200 SH
31 DELL TECHNOLOGIES INC DELL 24703L202 $2.4M 0.57% 4,500 SH
32 DELL TECHNOLOGIES INC Put DELL 24703L202 $2.4M 0.57% 4,500 SH
33 MICRON TECHNOLOGY INC Call MU 595112103 $2.3M 0.55% 2,200 SH
34 ADVANCED MICRO DEVICES INC Put AMD 007903107 $2.3M 0.55% 3,800 SH
35 WESTERN DIGITAL CORP Put WDC 958102105 $2.3M 0.54% 5,100 SH
36 STATE STR SPDR S&P 500 ETF T Call SPY 78462F103 $2.2M 0.52% 2,900 SH
37 APPLE INC AAPL 037833100 $2.2M 0.51% 6,510 SH
38 HEWLETT PACKARD ENTERPRISE C Put HPE 42824C109 $2.1M 0.50% 33,500 SH
39 HEWLETT PACKARD ENTERPRISE C HPE 42824C109 $2.1M 0.50% 33,235 SH
40 SEAGATE TECHNOLOGY HLDNGS PL Put STX G7997R103 $2.1M 0.50% 2,300 SH
41 ALPHABET INC Put GOOG 02079K107 $2.1M 0.50% 6,200 SH
42 ISHARES SILVER TR Call SLV 46428Q109 $2.0M 0.48% 37,500 SH
43 UNITED PARCEL SVCS INC Put UPS 911312106 $2.0M 0.47% 21,600 SH
44 SEAGATE TECHNOLOGY HLDNGS PL Call STX G7997R103 $1.9M 0.46% 2,100 SH
45 SELECT SECTOR SPDR TR Put XLK 81369Y803 $1.9M 0.45% 9,800 SH
46 UNITED STS OIL FD LP Call USO 91232N207 $1.9M 0.45% 13,000 SH
47 KROGER CO Put KR 501044101 $1.8M 0.43% 31,000 SH
48 NEBIUS GROUP N.V. Put NBIS N97284108 $1.8M 0.43% 7,700 SH
49 MICROSOFT CORP Call MSFT 594918104 $1.8M 0.42% 3,500 SH
50 META PLATFORMS INC META 30303M102 $1.7M 0.40% 2,358 SH
Filing History
Period Filed AUM Holdings Accession
2026-09-30 2026-10-09 $425.5M 216 0001722053-26-000007
2026-06-30 2026-08-05 $588.9M 234 0001722053-26-000004
2026-03-31 2026-05-01 $797.5M 464 0001722053-26-000003
2025-12-31 2026-01-27 $355.5M 264 0001722053-26-000001
Filer Information
Address
300 SOUTH RIVERSIDE PLAZA
SUITE 2350
CHICAGO, IL 60606
Phone
(312) 256-9628
Filing Manager
CenterStar Asset Management, LLC
CHICAGO, IL
Signatory
Brian A. Corby
Chief Compliance Officer