What does GROUP ONE TRADING, L.P. hold?

GROUP ONE TRADING, L.P.'s largest disclosed positions on the most recent Form 13F-HR filing on SEC EDGAR include TSM, MU. Full top-holdings list, quarter-over-quarter position changes, and sector allocation breakdown are available at https://13fpro.ai/research/fund/932540.

What is GROUP ONE TRADING, L.P.'s AUM?

GROUP ONE TRADING, L.P. reported approximately $71.1B in 13F-reportable AUM as of 2026-06-30. This figure reflects long US-listed positions disclosed on Form 13F-HR and excludes non-13F-reportable holdings (cash, short positions, certain derivatives, and non-US securities).

Where does 13F Pro source GROUP ONE TRADING, L.P.'s holdings?

All GROUP ONE TRADING, L.P. holdings data comes directly from SEC EDGAR Form 13F-HR filings under CIK 932540. Data refreshes automatically each quarter as new 13F filings are submitted (typically within 45 days of quarter-end). 13F Pro applies no third-party rewrites or estimates.

How often is GROUP ONE TRADING, L.P.'s 13F data updated on 13F Pro?

GROUP ONE TRADING, L.P.'s holdings update on 13F Pro within hours of each new Form 13F-HR filing on SEC EDGAR. Quarterly position changes, accumulation/distribution flags, and sector allocation are recalculated on each refresh.

GROUP ONE TRADING, L.P.

Institutional InvestorSimilar funds →SEC EDGAR: CIK 932540

Institutional-grade research for retail investors

Sector Allocation

Technology28.1%$973.7M
Other12.4%$429.1M
Financials11.8%$409.0M
Healthcare10.4%$361.9M
Consumer Discretionary10.0%$346.8M
Industrials7.3%$252.0M
Materials7.0%$241.8M
Communication Services4.1%$141.0M
Energy3.9%$136.1M
Consumer Staples3.0%$104.2M

AUM History

13fpro.ai/research/fund/group-one-trading-l-p-932540

Conviction and streaks

Concentrating · top 10 = 17.8%

From the fund's last 12 quarters of 13F filings: positions held longest at size, and names it added to or trimmed several quarters running.

$MUConviction hold2.4% weight · held 7 quarters

$YMMConviction hold2.3% weight · held 6 quarters

$MRVLConviction hold1.6% weight · held 7 quarters

$UNHConviction hold1.5% weight · held 7 quarters

$KKRConviction hold1.3% weight · held 6 quarters

$ONITAccumulating+1400% shares · 6 quarters running

$MOSAccumulating+1938% shares · 5 quarters running

$RHAccumulating+2044% shares · 5 quarters running

$QSAccumulating+359% shares · 5 quarters running

$SBUXAccumulating+354% shares · 5 quarters running

$IRENTrimming-95% shares · 5 quarters running

$HOODTrimming-78% shares · 5 quarters running

$SPGITrimming-32% shares · 5 quarters running

$ALTOTrimming-90% shares · 5 quarters running

$LYFTTrimming-97% shares · 5 quarters running

Largest positions — Q2 2026

ROUNDHILL
$108.6M
TSM
$92.3M

Top 20 stock positions. Options are left out: 13F reports them at the underlying's value.

13fpro.ai/research/fund/group-one-trading-l-p-932540

GROUP ONE TRADING, L.P. 13F holdings — Q2 2026

$71.1B portfolio (+36.2% QoQ) · 7,824 holdings · Q2 2026 13F · top 10 are 18% of the stock portfolio

Includes $67.6B of put/call options ($25.9B puts, $41.7B calls), which 13F rules report at the value of the underlying shares, not the premium at risk. Stocks alone: $3.5B. Weights use the stock portfolio.

1
ROUNDHILL ETF TRUST - MEMORY ETF
$108.6M
3.1% of stocks
NewThis quarter—Since filedNew this quarterHeld
AIQuality—Est. buy—
2
TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD
$TSM
$92.3M
2.7% of stocks
+40%This quarter+2.5%Since filed3 qtrsHeld
AIQuality—Est. buyEstimated buy price is Pro: unlock with a free trialAdded 3 qtrs in a row
3
MICRON TECHNOLOGY INC
$MU PUT
$2.4B
+40%This quarter—Since filed—Held
4
MICRON TECHNOLOGY INC
$MU CALL
$2.0B
+26%This quarter—Since filed—Held
5
SPDR GOLD TRUST
$GLD CALL
$1.4B
-7%This quarter—Since filed—Held
6
Sandisk Corp
$SNDK PUT
$1.3B
+39%This quarter—Since filed—Held
7
Tesla, Inc.
$TSLA CALL
$1.2B
-2%This quarter—Since filed—Held
8
Meta Platforms, Inc.
$META CALL
$1.0B
+19%This quarter—Since filed—Held
9
VANECK ETF TRUST - GOLD MINERS ETF PUT
$1.0B
+107%This quarter—Since filed—Held
10
MICROSOFT CORP
$MSFT CALL
$892.0M
+105%This quarter—Since filed—Held

#	Company	Value	Weight	This quarter	Since filed	Held	AI quality	Est. buy
1	ROUNDHILL ETF TRUST - MEMORY ETF	$108.6M	3.1%	New	—	New this quarter	—	—
2	TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD$TSM	$92.3M	2.7%	+40%	+2.5%	3 qtrsAdded 3 qtrs in a row	—	Estimated buy price is Pro: unlock with a free trial
3	MICRON TECHNOLOGY INC$MUPUT	$2.4B	—	+40%	—	—	—	—
4	MICRON TECHNOLOGY INC$MUCALL	$2.0B	—	+26%	—	—	—	—
5	SPDR GOLD TRUST$GLDCALL	$1.4B	—	-7%	—	—	—	—
6	Sandisk Corp$SNDKPUT	$1.3B	—	+39%	—	—	—	—
7	Tesla, Inc.$TSLACALL	$1.2B	—	-2%	—	—	—	—
8	Meta Platforms, Inc.$METACALL	$1.0B	—	+19%	—	—	—	—
9	VANECK ETF TRUST - GOLD MINERS ETF PUT	$1.0B	—	+107%	—	—	—	—
10	MICROSOFT CORP$MSFTCALL	$892.0M	—	+105%	—	—	—	—

All holdings — GROUP ONE TRADING, L.P. (Q2 2026)

Sort

7,824 disclosed positions from the Form 13F-HR on SEC EDGAR, with quarter-over-quarter share changes. Largest by value first; the ten above are not repeated. The page lists up to 1,000; every position is in the Excel export.

#		Company						Held		Source
11	$SNDKCALL	Sandisk Corp	Technology	$847.0M	—	373K	+22%	—	—	13F
12	$INTCCALL	INTEL CORP	Technology	$697.3M	—	4.99M	-31%	—	—	13F
13	$AAPLCALL	Apple Inc.	Technology	$680.4M	—	2.35M	+18%	—	—	13F
14	$TSLAPUT	Tesla, Inc.	Consumer Discretionary	$673.8M	—	1.60M	+21%	—	—	13F
15	$UNHCALL	UNITEDHEALTH GROUP INC	Healthcare	$670.7M	—	1.61M	-40%	—	—	13F
16	$NVDACALL	NVIDIA CORP	Technology	$631.7M	—	3.16M	+12%	—	—	13F
17	— CALL	VANECK ETF TRUST - GOLD MINERS ETF	—	$608.1M	—	3.98M	+17%	—	—	13F
18	$LLYCALL	ELI LILLY & Co	Healthcare	$565.9M	—	472K	+45%	—	—	13F
19	$TSMPUT	TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD	Technology	$535.5M	—	1.12M	+37%	—	—	13F
20	$AMDCALL	ADVANCED MICRO DEVICES INC	Technology	$531.3M	—	915K	+21%	—	—	13F
21	$AMDPUT	ADVANCED MICRO DEVICES INC	Technology	$491.3M	—	846K	+32%	—	—	13F
22	$GOOGCALL	Alphabet Inc.	Technology	$460.7M	—	1.30M	+43%	—	—	13F
23	$GLDPUT	SPDR GOLD TRUST	Financials	$442.8M	—	1.20M	-21%	—	—	13F
24	$NBISCALL	Nebius Group N.V.	Technology	$425.1M	—	1.54M	-3%	—	—	13F
25	— PUT	ISHARES INC - MSCI STH KOR ETF	—	$400.0M	—	1.99M	+24%	—	—	13F
26	— CALL	ISHARES INC - MSCI STH KOR ETF	—	$385.8M	—	1.92M	+46%
27	$UNH PUT	UNITEDHEALTH GROUP INC	Healthcare	$359.8M	—	866K	-12%
28	$TSM CALL	TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD	Technology	$357.9M	—	749K	+68%
29	$GS CALL	GOLDMAN SACHS GROUP INC	Financials	$344.0M	—	340K	+114%
30	$LLY PUT	ELI LILLY & Co	Healthcare	$333.2M	—	278K	-13%
31	$FSLR CALL	FIRST SOLAR, INC.	Technology	$326.1M	—	1.38M	+15%
32	$BABA CALL	Alibaba Group Holding Ltd	Consumer Discretionary	$319.1M	—	3.32M	+2%
33	$AVGO CALL	Broadcom Inc.	Technology	$316.1M	—	837K	+31%
34	— PUT	ISHARES TR - ISHARES SEMICDTR	—	$311.6M	—	486K	+1521%
35	$INTC PUT	INTEL CORP	Technology	$305.3M	—	2.19M	-11%
36	$NVDA PUT	NVIDIA CORP	Technology	$288.1M	—	1.44M	+32%
37	$BE CALL	Bloom Energy Corp	Technology	$284.9M	—	941K	-24%
38	— CALL	UNITED STS OIL FD LP - UNITS	—	$274.5M	—	2.58M	-18%
39	— PUT	UNITED STS OIL FD LP - UNITS	—	$274.1M	—	2.58M	+21%
40	— CALL	ROUNDHILL ETF TRUST - MEMORY ETF	—	$271.7M	—	3.68M	New
41	$ARM CALL	ARM HOLDINGS PLC /UK	Technology	$268.6M	—	758K	-10%
42	$ASST CALL	Strive, Inc.	Financials	$264.0M	—	24.20M	-30%
43	$AVGO PUT	Broadcom Inc.	Technology	$262.0M	—	694K	+9%
44	$SLV CALL	iShares Silver Trust	Financials	$259.2M	—	4.85M	-32%
45	$ASTS CALL	AST SpaceMobile, Inc.	Communication Services	$252.1M	—	2.84M	+7%
46	$LRCX CALL	LAM RESEARCH CORP	Technology	$235.8M	—	544K	+18%
47	$PLTR CALL	Palantir Technologies Inc.	Technology	$230.7M	—	1.98M	+23%
48	$NFLX CALL	NETFLIX INC	Communication Services	$228.6M	—	3.20M	+34%
49	$BE PUT	Bloom Energy Corp	Technology	$227.3M	—	751K	-25%
50	$ASML PUT	ASML HOLDING NV	Technology	$221.2M	—	111K	-8%
51	$ARM PUT	ARM HOLDINGS PLC /UK	Technology	$215.6M	—	608K	+47%
52	$AAPL PUT	Apple Inc.	Technology	$214.8M	—	742K	+77%
53	$IREN PUT	IREN Ltd	Financials	$210.9M	—	4.61M	+21%
54	$MRVL CALL	Marvell Technology, Inc.	Technology	$204.7M	—	687K	+38%
55	$RKLB CALL	Rocket Lab Corp	Industrials	$204.0M	—	2.01M	+13%
56	— PUT	ISHARES TR - MSCI EAFE ETF	—	$199.1M	—	2.16M	+75%
57	— CALL	DIREXION SHARES ETF TRUST - DAI SEM BUL ETF	—	$195.7M	—	734K	-5%
58	$IREN CALL	IREN Ltd	Financials	$195.0M	—	4.26M	-21%
59	$BRK-A CALL	BERKSHIRE HATHAWAY INC	Financials	$187.8M	—	375K	+5%
60	$MSTR PUT	Strategy Inc	Financials	$184.7M	—	2.12M	+27%
61	$XOM.R34088 CALL	EXXON MOBIL CORP	Energy	$182.0M	—	1.33M	-10%
62	$WULF CALL	TERAWULF INC.	Financials	$182.0M	—	7.37M	+77%
63	$PDD CALL	PDD Holdings Inc.	Consumer Discretionary	$181.8M	—	2.38M	+38%
64	$HOOD CALL	Robinhood Markets, Inc.	Financials	$178.3M	—	1.78M	+21%
65	$ORCL CALL	ORACLE CORP	Technology	$176.9M	—	1.21M	+97%
66	$META PUT	Meta Platforms, Inc.	Technology	$176.4M	—	313K	-2%
67	$GOOG CALL	Alphabet Inc.	Technology	$175.5M	—	491K	+50%
68	$AMZN CALL	AMAZON COM INC	Consumer Discretionary	$173.6M	—	729K	+58%
69	$CSCO CALL	CISCO SYSTEMS, INC.	Technology	$172.0M	—	1.46M	+403%
70	$WDC CALL	WESTERN DIGITAL CORP	Technology	$171.0M	—	268K	-20%
71	— CALL	SPDR SERIES TRUST - ST STR SP BIOT	—	$170.5M	—	1.08M	+76%
72	$POET CALL	POET TECHNOLOGIES INC.	Technology	$169.8M	—	16.52M	+134%
73	— CALL	GLOBAL X FDS - GLOBAL X COPPER	—	$167.9M	—	2.18M	+105%
74	$GOOG PUT	Alphabet Inc.	Technology	$165.9M	—	470K	+236%
75	$ADBE CALL	ADOBE INC.	Technology	$164.1M	—	801K	+229%
76	$GS PUT	GOLDMAN SACHS GROUP INC	Financials	$163.0M	—	161K	+44%
77	— CALL	ISHARES TR - CHINA LG-CAP ETF	—	$162.9M	—	3.20M	+11%
78	$MSFT PUT	MICROSOFT CORP	Technology	$162.0M	—	434K	+26%
79	$DELL CALL	Dell Technologies Inc.	Technology	$160.0M	—	371K	+7%
80	$SHOP CALL	SHOPIFY INC.	Technology	$156.1M	—	1.37M	+317%
81	— CALL	ISHARES TR - MSCI EAFE ETF	—	$155.3M	—	1.69M	+37%
82	$BA CALL	BOEING CO	Industrials	$154.3M	—	713K	-20%
83	$QCOM CALL	QUALCOMM INC/DE	Technology	$152.3M	—	824K	+162%
84	$VST CALL	Vistra Corp.	Utilities	$151.5M	—	955K	+368%
85	$LQDA CALL	Liquidia Corp	Healthcare	$149.9M	—	1.88M	-28%
86	— CALL	KRANESHARES TRUST - CSI CHI INTERNET	—	$145.5M	—	5.95M	+13%
87	$FSLR PUT	FIRST SOLAR, INC.	Technology	$145.5M	—	617K	-36%
88	$GEV PUT	GE Vernova Inc.	Industrials	$144.2M	—	123K	-47%
89	$ECHO CALL	EchoStar CORP	Communication Services	$144.0M	—	1.42M	+18%
90	$CCJ CALL	CAMECO CORP	Materials	$142.6M	—	1.40M	-5%
91	$VRT CALL	Vertiv Holdings Co	Technology	$141.1M	—	421K	-9%
92	$LRCX PUT	LAM RESEARCH CORP	Technology	$139.8M	—	323K	+38%
93	$CRWD CALL	CrowdStrike Holdings, Inc.	Technology	$139.7M	—	183K	+5%
94	— CALL	ISHARES TR - ISHARES SEMICDTR	—	$137.3M	—	217K	+247%
95	— PUT	APPLIED MATLS INC - COM	—	$137.1M	—	190K	+309%
96	$PANW CALL	Palo Alto Networks Inc	Technology	$136.9M	—	401K	+173%
97	$GEV CALL	GE Vernova Inc.	Industrials	$135.5M	—	115K	-35%
98	$C CALL	CITIGROUP INC	Financials	$132.3M	—	945K	+6%
99	$NRG PUT	NRG ENERGY, INC.	Utilities	$131.9M	—	903K	+103%
100	— PUT	SEAGATE TECHNOLOGY HLDNGS PL - ORD SHS	—	$131.7M	—	137K	-9%
101	$BA PUT	BOEING CO	Industrials	$130.7M	—	604K	+12%
102	$MRVL PUT	Marvell Technology, Inc.	Technology	$130.3M	—	438K	+40%
103	— PUT	ROUNDHILL ETF TRUST - MEMORY ETF	—	$128.9M	—	1.74M	New
104	— CALL	SPACE EXPLORATION TECHN CORP - CLASS A COM STK	—	$128.6M	—	753K	New
105	$GSAT CALL	Globalstar, Inc.	Communication Services	$127.7M	—	1.57M	+11%
106	$ALAB CALL	Astera Labs, Inc.	Technology	$125.9M	—	261K	+33%
107	$DELL PUT	Dell Technologies Inc.	Technology	$124.7M	—	289K	-1%
108	$CSCO PUT	CISCO SYSTEMS, INC.	Technology	$124.4M	—	1.06M	+73%
109	$MSTR CALL	Strategy Inc	Financials	$119.9M	—	1.38M	-21%
110	$NBIS PUT	Nebius Group N.V.	Technology	$119.5M	—	433K	+16%
111	$WOLF CALL	WOLFSPEED, INC.	Technology	$116.6M	—	2.42M	+337%
112	$ET CALL	Energy Transfer LP	Energy	$115.6M	—	6.05M	+26%
113	$ETN CALL	Eaton Corp plc	Industrials	$115.4M	—	271K	+225%
114	$ASML CALL	ASML HOLDING NV	Technology	$114.8M	—	58K	+14%
115	— CALL	SELECT SECTOR SPDR TR - ST STR TECHN ETF	—	$114.0M	—	599K	+41%
116	— CALL	INTERNATIONAL BUSINESS MACHS - COM	—	$113.9M	—	405K	+233%
117	$CRWV CALL	CoreWeave, Inc.	Technology	$112.4M	—	1.13M	-32%
118	$WDC PUT	WESTERN DIGITAL CORP	Technology	$112.1M	—	176K	+6%
119	$NOW CALL	ServiceNow, Inc.	Technology	$111.0M	—	1.12M	+139%
120	$AMAT CALL	APPLIED MATERIALS INC /DE	Technology	$110.3M	—	153K	+12%
121	— CALL	AMPLIFY ETF TR - JR SILV MINE ETF	—	$108.3M	—	4.18M	+1%
122	$JPM CALL	JPMORGAN CHASE & CO	Financials	$108.1M	—	330K	+12%
123	$NFLX PUT	NETFLIX INC	Communication Services	$108.0M	—	1.51M	+31%
124	— CALL	SPDR SERIES TRUST - ST STR SP REGBNK	—	$107.9M	—	1.40M	+192%
125	$KKR PUT	KKR & Co. Inc.	Financials	$107.3M	—	1.17M	+29%
126	$PLTR PUT	Palantir Technologies Inc.	Technology	$107.0M	—	917K	+55%
127	— PUT	SPACE EXPLORATION TECHN CORP - CLASS A COM STK	—	$106.5M	—	623K	New
128	— CALL	PROSHARES TR - ULTRAPRO QQQ	—	$105.6M	—	1.30M	+11%
129	$BIDU CALL	Baidu, Inc.	Technology	$105.1M	—	920K	-5%
130	$C PUT	CITIGROUP INC	Financials	$104.9M	—	749K	+37%
131	$SLV PUT	iShares Silver Trust	Financials	$104.5M	—	1.96M	-7%
132	— PUT	ISHARES TR - MSCI USA MMENTM	—	$102.2M	—	298K	New
133	$NOK CALL	NOKIA CORP	Technology	$101.8M	—	7.67M	+202%
134	$CVNA CALL	CARVANA CO.	Consumer Discretionary	$100.5M	—	1.53M	+252%
135	$COIN CALL	Coinbase Global, Inc.	Financials	$100.3M	—	686K	-19%
136	— PUT	SPDR SERIES TRUST - ST STR SP REGBNK	—	$99.0M	—	1.29M	+8%
137	$DVN CALL	DEVON ENERGY CORP/DE	Energy	$98.7M	—	2.39M	+82%
138	— CALL	SELLAS LIFE SCIENCES GROUP I - COM NEW	—	$98.1M	—	6.65M	-23%
139	— CALL	ARK ETF TR - INNOVATION ETF	—	$97.8M	—	1.21M	-15%
140	$MCHP CALL	MICROCHIP TECHNOLOGY INC	Technology	$97.3M	—	1.07M	+952%
141	$CRM CALL	Salesforce, Inc.	Technology	$95.8M	—	611K	+42%
142	$CORZ CALL	Core Scientific, Inc./tx	Financials	$95.5M	—	3.73M	-11%
143	$CAT CALL	CATERPILLAR INC	Industrials	$93.4M	—	88K	+35%
144	$JPM PUT	JPMORGAN CHASE & CO	Financials	$91.3M	—	279K	+35%
145	— CALL	ISHARES INC - MSCI BRAZIL ETF	—	$91.2M	—	2.61M	+45%
146	$NVO CALL	NOVO NORDISK A S	Healthcare	$91.2M	—	1.90M	-17%
147	$GLW CALL	CORNING INC /NY	Materials	$90.3M	—	354K	-14%
148	— PUT	ISHARES TR - CHINA LG-CAP ETF	—	$88.7M	—	1.71M	+12%
149	$ORCL PUT	ORACLE CORP	Technology	$88.6M	—	605K	+43%
150	— CALL	SPROTT FDS TR - URANI MINER ETF	—	$88.6M	—	1.69M	-26%

What changed in Q2 2026

Against the previous quarter's 13F: 1,351 new, 2,914 added to, 3,133 trimmed, 1,349 sold out. Share-count changes; largest moves by dollar size first.

New positions (1,351)

CALLROUNDHILL ETF TRUST - MEMORY ETF$271.7M
first bought this quarter
PUTROUNDHILL ETF TRUST - MEMORY ETF$128.9M
first bought this quarter
CALLSPACE EXPLORATION TECHN CORP - CLASS A COM STK$128.6M
first bought this quarter
ROUNDHILL ETF TRUST - MEMORY ETF$108.6M
first bought this quarter
PUTSPACE EXPLORATION TECHN CORP - CLASS A COM STK$106.5M
first bought this quarter
$CBRSCALLCerebras Systems Inc.$86.8M
first bought this quarter

+1,345 more in the Excel export

Added to (2,914)

$MUPUTMICRON TECHNOLOGY INC+40%
now $2.4B
PUTVANECK ETF TRUST - GOLD MINERS ETF+107%
now $1.0B
$MSFTCALLMICROSOFT CORP+105%
now $892.0M
$MUCALLMICRON TECHNOLOGY INC+26%
now $2.0B
$SNDKPUTSandisk Corp+39%
now $1.3B
PUTISHARES TR - ISHARES SEMICDTR+1521%
now $311.6M

+2,908 more in the Excel export

Trimmed (3,133)

$UNHCALLUNITEDHEALTH GROUP INC-40%
now $670.7M
$INTCCALLINTEL CORP-31%
now $697.3M
$GEVPUTGE Vernova Inc.-47%
now $144.2M
$SLVCALLiShares Silver Trust-32%
now $259.2M
$GLDPUTSPDR GOLD TRUST-21%
now $442.8M
$IRLACALLIRulya Therapeutics Inc.-100%
now $351K

+3,127 more in the Excel export

Sold out (1,349)

$FICOCALLFAIR ISAAC CORPwas $35.3M
$TERNCALLTerns Pharmaceuticals, Inc.was $31.8M
$UTHRCALLUNITED THERAPEUTICS Corpwas $28.3M
$CYTKCYTOKINETICS INCwas $24.0M
held 5 qtrs
$EGCALLEVEREST GROUP, LTD.was $22.9M
$CCLPUTCarnival Corp Ltd.was $22.7M

+1,343 more in the Excel export

Holdings by quarter

Every 13F GROUP ONE TRADING, L.P. has filed, 38 earlier quarters. Pick one to see what it held then.

Email me the moment this fund files its next 13FPro

Is it too late to follow GROUP ONE TRADING, L.P.?

Q2 2026 13F filed with the SEC on Aug 14, 2026. Prices are closing prices as of Oct 27, 2026.

Average quality of GROUP ONE TRADING, L.P.'s top 20 holdings: 69/100 (our AI quality score, weighted by position size; 15 of the 20 are scored)

Top 10 since filing

-3.7%

Value-weighted move of the 10 largest stock positions

Turnover

45%

Last quarter; 169% over the last 4

Top 10 weight

18%

Share of the stock portfolio in its 10 largest positions

Held 4+ quarters

60%

Share of portfolio value in positions held a year or more

Highest-quality names it owns(among its 100 largest positions)

The 8 highest-scoring companies in this portfolio are a Pro feature.

How these are measured

Moves since the quarter-end and since the filing date use our own daily closing prices, from the close on (or just before) each date to the latest close.
Turnover is the lesser of shares bought or sold in a quarter, valued at the quarter-end prices in the 13F, divided by the average of the two quarters' stock portfolio values.
Quarters held and add/trim streaks count back only through quarters whose filed holdings add up to the filing's own cover-page total (back to Q4 2024 for this fund). A change counts as an add or a trim when the split-adjusted share count moves by more than 1%.
Estimate, not the fund's reported cost. For each quarter in the current holding period in which the fund's share count rose (split-adjusted), we take that quarter's average daily close and weight it by the shares added; sales do not change an average cost. Quarters where the stock's price history and the 13F's own implied price disagree by more than 2x are left out.
Put and call option rows report the value of the underlying shares, not a position the fund paid for, so they are left out of all of the above.

Portfolio Overview

GROUP ONE TRADING, L.P. disclosed 7,824 positions worth $71.1B in its Form 13F-HR for Q2 2026 — $3.5B in common stock plus $67.6B of put/call option positions (reported at underlying notional value, not premium at risk), followed by $TSM and $MU. During the quarter the fund opened 1351 new positions and exited 1349 and a full exit from $FICO. The portfolio is most concentrated in Technology (28.1% of disclosed assets). All figures are sourced directly from GROUP ONE TRADING, L.P.’s Form 13F-HR filing with the SEC under CIK 932540.

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AI-Powered Hedge Fund Analysis: GROUP ONE TRADING, L.P.

13F Pro is an AI hedge fund tracker and stock research platform. For GROUP ONE TRADING, L.P. (SEC CIK: 932540), the platform ingests every quarterly Form 13F filing and applies AI-powered analysis on top — 10 specialized AI analysts (value, growth, momentum, macro, activist, and more) debate the fund's top positions and publish AI-generated analysis with cited SEC sources.

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