Entity type
Company
Filer Snapshot
GROUP ONE TRADING LLC
CIK 0000932540. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.
Total filings
57
Latest filing
13 May 2026
Industry
n/a
Filing-backed research brief
Start with the SEC data that changes for this CIK
Latest signal: 13F-HR for Q1 2026. Each card links back to the PortfolioSavvy page where the filing evidence is closest.
Latest 13F portfolio
$3.03B
2,167 holdings for Q1 2026
Open portfolioLargest parsed holding
URA
$84.85M reported value
Open holding13D/G large stake
QNCX
28 Feb 2026 · 11% ownership
Open 13D/GInsider / owner context
—
No parsed Forms 3/4/5 owner position for this CIK.
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Source: SEC Form 13F
View source filing
13F-HR filed on 13 May 2026 for CIK 0000932540.
- Parsed SEC ownership signals
-
Parsed SEC ownership coverage
These bars compare filing-backed value available in each disclosure family. Read them as separate lenses, not as one combined ownership total.
13F portfolio$3.03BQuarterly institutional holdings reported on Form 13F; not total AUM.
Latest reported 13F value
13F$3.03BReported market value from the latest parsed Form 13F information table; this is not total assets under management.
Source: SEC Form 13FScope: U.S.-listed equity holdingsLargest 13F holdings
13FURA SILJ MU TSM AG+15 more
URNM MAR PBR EWY KKR CYTK COPX CDE KWEB EWZ INTC VST SOFI IREN LITELargest symbols in the latest parsed Form 13F information table.
Freshness: Latest parsed 13F periodLargest 13F holdings
Largest symbols in the latest parsed Form 13F information table.
URA SILJ MU TSM AG URNM MAR PBR+12 more
EWY KKR CYTK COPX CDE KWEB EWZ INTC VST SOFI IREN LITELargest active 13G stakes
Passive or institutional large-stake positions disclosed in parsed Schedule 13G filings.
RILY QNCXHow to read these SEC ownership signals
- Read each filing family separately: Form 13F, Schedules 13D/G, and Forms 3/4/5 answer different SEC disclosure questions and should not be blended into one ownership total.
- Use 13F values for visible U.S.-listed equity portfolios, 13D/G rows for large beneficial-owner stakes, and Forms 3/4/5 rows for reporting-owner positions and transactions.
- Open the linked research path when you need the filing, CIK, issuer, CUSIP, date, or source trail behind a value.
- Business address
- 425 S Financial Place, Suite 3400, Chicago, IL, 60605
- Incorporated in
- DE
- Fiscal year end
- 30 September
- Former names on EDGAR
- GROUP ONE TRADING, L.P. (to 14 Aug 2024), GROUP ONE TRADING L P (to 29 Nov 2002)
Ownership signals
CIK-linked ownership evidence from parsed SEC filings.
1 signal
At a glance
Names, identifiers, and filing context for this profile.
1 identity field
EDGAR profile Static EDGAR fields kept behind disclosure so the main profile stays readable. 3 profile fields available
Filer intelligence
What SEC filings say about GROUP ONE TRADING LLC
A compact read of parsed XML filings. 13F, 13D/G, and Forms 3/4/5 are shown separately because they answer different ownership questions.
Quick read
- Latest parsed 13F shows $3.03B across 2,167 reported holdings for Q1 2026.
- Largest parsed 13F holding: URA at $84.85M.
- 2 recent 13D/G stake rows found; top row is QNCX at 11% ownership.
SEC source mix
Counts show available parsed rows, not one combined ownership total.
Top parsed 13F holdings
Visual share of the latest parsed 13F portfolio. Values are reported market value, not a recommendation.
Top 5 concentration
9.8%
Share of latest parsed 13F value represented by the visible holdings below.
Top 5 reported value
$297.61M
Compared with $3.03B total 13F value.
Top 5 net change
+$101.92M
Position-value change inside the visible top holdings only.
13F concentration map
A simple visual split of the latest parsed 13F portfolio.
Largest add: URA · Largest trim: SILJ
URA
SILJ
MU
TSM
AG
Other holdings
13D/G large-stake context
QNCX
28 Feb 2026 · Common Stock, par value $0.0001 par value
RILY
31 Mar 2025 · Common Stock, par value $0.0001 par value
Latest update
What changed recently for GROUP ONE TRADING LLC
Latest 13F period: Q1 2026. Open the source-backed page to inspect the fresh filing or facts context.
Update date
13 May 2026
Page type
Filer profile
Latest period
Q1 2026
Institutional portfolio context was refreshed from a 13F filing filed on 13 May 2026.
Benchmark Context
Benchmark context for this company
GROUP ONE TRADING LLC has a source-backed company facts view where you can compare the latest reported metrics with its own recent history and with peer rankings for the same metric.
Compared with
Start on the facts page for period-to-period context, then open a metric ranking when you want to compare the same reported fact across other SEC-reporting companies.
Why this is notable
Latest 13F period: Q1 2026. That gives you a fresh baseline before you compare this company with peers.
- Peer comparisons stay conservative: same metric, compatible units, latest valid company row only.
- Open the facts page first if you want the cleanest path to verification.
Benchmark context is only shown where the app has enough comparable SEC-backed data to keep the interpretation honest.
SEC filing record
CIK 0000932540 filing coverage
Start with this filing record, then use the linked ownership pages when parsed 13F, 13D/G, Forms 3/4/5, or facts data exists for this CIK.
SEC filings
57
First seen
31 Jan 2014
Latest filing
13 May 2026
Entity
Company
Observed form types
13F-HR
13F-HR/A
SCHEDULE 13G
Latest Filings
Showing the latest 12 of 57 SEC filings for GROUP ONE TRADING LLC.
13F-HR
13F-HR filing
- Filing date
- 13 May 2026
- Reporting date
- 31 Mar 2026
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
SCHEDULE 13G
SCHEDULE 13G filing
- Filing date
- 05 Mar 2026
- Reporting date
- Not listed
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
13F-HR
13F-HR filing
- Filing date
- 12 Feb 2026
- Reporting date
- 31 Dec 2025
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
13F-HR
13F-HR filing
- Filing date
- 12 Nov 2025
- Reporting date
- 30 Sep 2025
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
13F-HR
13F-HR filing
- Filing date
- 14 Aug 2025
- Reporting date
- 30 Jun 2025
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
SCHEDULE 13G
SCHEDULE 13G filing
- Filing date
- 14 May 2025
- Reporting date
- Not listed
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
13F-HR/A
13F-HR/A filing
- Filing date
- 14 May 2025
- Reporting date
- 31 Dec 2024
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
13F-HR
13F-HR filing
- Filing date
- 14 May 2025
- Reporting date
- 31 Mar 2025
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
13F-HR
13F-HR filing
- Filing date
- 14 Feb 2025
- Reporting date
- 31 Dec 2024
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
SCHEDULE 13G
SCHEDULE 13G filing
- Filing date
- 14 Nov 2024
- Reporting date
- Not listed
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
13F-HR
13F-HR filing
- Filing date
- 14 Nov 2024
- Reporting date
- 30 Sep 2024
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
13F-HR
13F-HR filing
- Filing date
- 14 Aug 2024
- Reporting date
- 30 Jun 2024
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing