SummitTX Capital, L.P. — 13F Holdings & Portfolio
CIK 2052310 · latest 13F-HR filed 2026-08-14
SummitTX Capital, L.P. manages $3.89B in 13F-reported U.S. long-equity assets across 762 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are SPY (12.31%), QQQ (7.19%), ADI (1.78%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 329 new positions and exited 311; 206 existing positions rose in reported value and 205 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
$3.89B
Long-equity book
Holdings
762
Distinct positions
Period
2026-06-30
Filed 2026-08-14
Q/Q Activity
+329 / −311 / ↑206 / ↓205
vs 2026-03-31
Portfolio charts
Latest quarter's book, what changed, and how the portfolio has evolved across filings.
Portfolio map
Q2 26SPY12.6% · -12%QQQ7.4% · +32%ADI1.8% · +948%MKSI1.5% · -18%ASML1.4% · -5%AMAT1.1% · -4%XLI0.9% · newNXPI0.9% · +119%AMZN0.8% · +16%ORLY0.7% · +80%CBRE0.7% · +178%MU0.7% · newMMM0.7% · +818%LPLA0.7% · +386%AMD0.7% · newONTO0.7% · +165%MDY0.6% · -36%LOW0.6% · newLNT0.6% · +8%ZION0.6% · +2470%LIN0.5% · +194%WMT0.5% · +279%USB0.5% · +696%AEE0.5% · +9%CSCO0.5% · -52%NVR0.5% · -31%ROKU0.5% · newCOST0.5% · +94%RSP0.5% · -62%ICE0.5% · +537%TOL0.5% · newWBD0.5% · -16%GLPI0.4% · +44%FLEX0.4% · -18%EL0.4% · +93%QXO0.4% · newCHH0.4% · +16%LBRDK0.4% · +294%GLXY0.4% · newTNL0.4% · +911%DVN0.4% · newFND0.4% · newECL0.4% · newSTX0.4% · newBAC0.4% · newMSI0.4% · +42%CRDO0.4% · +688%AS0.4% · newSITE0.4% · newCOF0.4% · newEPRT0.4% · +6%RYTM0.4% · -24%FHN0.4% · +871%ETR0.4% · -32%GFF0.4% · -66%RKT0.4% · +259%ONON0.4% · +1413%HBAN0.3% · +587%IBP0.3% · newAEO0.3% · new
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 valueSectors from each company's SIC code; funds and ETFs grouped separately.
Biggest buys and sells
Q1 26 → Q2 26Estimated 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 quartersTotal reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.
Top positions over time
reported valueThe eight largest current positions, valued at each quarter end.
Concentration
top 10 = 29.3%Cumulative share of the portfolio held in the largest N positions.
Firm Profile & Key People
As of the firm’s regulatory filing dated Oct 19, 2026.
Assets Under Management
$10.10B
Discretionary
$10.10B
Employees
70
Accounts
3
Address
201 MAIN STREET
SUITE 1900
FORT WORTH, TX 76102
SUITE 1900
FORT WORTH, TX 76102
Phone
(817) 769-1578
| Name | Title / Status | Ownership | Type |
|---|---|---|---|
| ARBOUR, THOMAS, NEILSON Control | CO-CHIEF INVESTMENT OFFICER since Feb 2026 | Less than 5% | Individual |
| COOLEY, CAROLINE, ANN Control | CHIEF EXECUTIVE OFFICER since Feb 2026 | Less than 5% | Individual |
| DIDYCH, ALEX Control | CHIEF RISK OFFICER since Nov 2024 | Less than 5% | Individual |
| LILLY, MELINDA, THOMPSON Control | CHIEF ADMINISTRATIVE OFFICER since Nov 2024 | Less than 5% | Individual |
| PELLER, BRIAN Control | CHIEF OPERATING OFFICER since Nov 2024 | Less than 5% | Individual |
| POSNER, COURTNEY, BROOKE Control | GENERAL COUNSEL & CHIEF COMPLIANCE OFFICER since Jul 2026 | Less than 5% | Individual |
| SUMMITTX INVESTORS, LLC Control | GENERAL PARTNER since Nov 2024 | Less than 5% | Domestic Entity |
| SUMMITTX PARTNER HOLDINGS L.P. Control | LIMITED PARTNER since Jan 2026 | 75% or more | Domestic Entity |
| TIMOTHEOU, JOHN Control | CHIEF TECHNOLOGY OFFICER since Feb 2025 | Less than 5% | Individual |
| SUMMITTX EMPLOYEE HOLDINGS L.P. | LIMITED PARTNER since Jan 2026 | Less than 5% | Domestic Entity |
| BASS, EDWARD Indirect owner via FINE LINE GP LLC | MEMBER since Jul 2005 | 75% or more | Individual |
| BASS, EDWARD Indirect owner via FINE LINE L.P. | LIMITED PARTNER since Jul 2005 | 75% or more | Individual |
| FINE LINE GP LLC Indirect owner via FINE LINE L.P. | GENERAL PARTNER since Jul 2005 | General partner, trustee or manager | Domestic Entity |
| FINE LINE L.P. Indirect owner via THRU LINE, L.P. | LIMITED PARTNER since Jul 2005 | 75% or more | Domestic Entity |
| FINE LINE L.P. Indirect owner via THRU LINE GP LLC | MEMBER since Jul 2005 | 75% or more | Domestic Entity |
| THRU LINE GP LLC Indirect owner via THRU LINE, L.P. | GENERAL PARTNER since Jul 2005 | General partner, trustee or manager | Domestic Entity |
| THRU LINE, L.P. Indirect owner via SUMMITTX PARTNER HOLDINGS L.P. | LIMITED PARTNER since Jan 2026 | 25–50% | Domestic Entity |
Ownership & leadership changes · 4 filings with changes since Nov 20, 2024
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.
Aug 26, 2026 filing
- No longer listedDOYLE, MEGAN · INTERIM CHIEF COMPLIANCE OFFICER · Less than 5% · control person · listed since Dec 2025
- AddedPOSNER, COURTNEY, BROOKE · GENERAL COUNSEL & CHIEF COMPLIANCE OFFICER · Less than 5% · control person
Mar 31, 2026 filing
- No longer listedNELSON, SCOTT, MICHAEL · HEAD OF CLIENT PARTNERSHIP GROUP · Less than 5% · control person · listed since Nov 2024
- ChangedARBOUR, THOMAS, NEILSON · title DEPUTY CHIEF INVESTMENT OFFICER → CO-CHIEF INVESTMENT OFFICER
- ChangedCOOLEY, CAROLINE, ANN · title CHIEF INVESTMENT OFFICER → CHIEF EXECUTIVE OFFICER
Jan 23, 2026 filing
- No longer listedBRATTON, DOUGLAS, KELVIN · SOLE SHAREHOLDER · 75% or more · indirect via CRESTLINE INVESTORS, INC. · listed since Dec 1997
- No longer listedCRESTLINE INVESTORS, INC. · GENERAL PARTNER · General partner, trustee or manager · indirect via CRESTLINE MANAGEMENT, L.P. · listed since Jan 1998
- No longer listedCRESTLINE MANAGEMENT, L.P. · LIMITED PARTNER · 75% or more · control person · listed since Nov 2024
- No longer listedCRESTLINE MANAGEMENT, L.P. · SOLE OWNER · 75% or more · indirect via SUMMITTX INVESTORS, LLC · control person · listed since Sep 2023
- No longer listedMCGOWAN, SHAUN, NEIL · CHIEF COMPLIANCE OFFICER · Less than 5% · control person · listed since Nov 2024
- No longer listedTHRU LINE, L.P. · LIMITED PARTNER · 25–50% · indirect via CRESTLINE MANAGEMENT, L.P. · listed since Jan 2016
- AddedDOYLE, MEGAN · INTERIM CHIEF COMPLIANCE OFFICER · Less than 5% · control person
- AddedSUMMITTX EMPLOYEE HOLDINGS L.P. · LIMITED PARTNER · Less than 5%
- AddedSUMMITTX PARTNER HOLDINGS L.P. · LIMITED PARTNER · 75% or more · control person
- AddedTHRU LINE, L.P. · LIMITED PARTNER · 25–50% · indirect via SUMMITTX PARTNER HOLDINGS L.P.
May 16, 2025 filing
- AddedTIMOTHEOU, JOHN · CHIEF TECHNOLOGY OFFICER · Less than 5% · control person
Nov 20, 2024 filing (earliest on record)
- ListedARBOUR, THOMAS, NEILSON · DEPUTY CHIEF INVESTMENT OFFICER · Less than 5% · control person
- ListedBASS, EDWARD · MEMBER · 75% or more · indirect via FINE LINE GP LLC
- ListedBASS, EDWARD · LIMITED PARTNER · 75% or more · indirect via FINE LINE L.P.
- ListedBRATTON, DOUGLAS, KELVIN · SOLE SHAREHOLDER · 75% or more · indirect via CRESTLINE INVESTORS, INC.
- ListedCOOLEY, CAROLINE, ANN · CHIEF INVESTMENT OFFICER · Less than 5% · control person
- ListedCRESTLINE INVESTORS, INC. · GENERAL PARTNER · General partner, trustee or manager · indirect via CRESTLINE MANAGEMENT, L.P.
- ListedCRESTLINE MANAGEMENT, L.P. · LIMITED PARTNER · 75% or more · control person
- ListedCRESTLINE MANAGEMENT, L.P. · SOLE OWNER · 75% or more · indirect via SUMMITTX INVESTORS, LLC · control person
- ListedDIDYCH, ALEX · CHIEF RISK OFFICER · Less than 5% · control person
- ListedFINE LINE GP LLC · GENERAL PARTNER · General partner, trustee or manager · indirect via FINE LINE L.P.
- ListedFINE LINE L.P. · LIMITED PARTNER · 75% or more · indirect via THRU LINE, L.P.
- ListedFINE LINE L.P. · MEMBER · 75% or more · indirect via THRU LINE GP LLC
- ListedLILLY, MELINDA, THOMPSON · CHIEF ADMINISTRATIVE OFFICER · Less than 5% · control person
- ListedMCGOWAN, SHAUN, NEIL · CHIEF COMPLIANCE OFFICER · Less than 5% · control person
- ListedNELSON, SCOTT, MICHAEL · HEAD OF CLIENT PARTNERSHIP GROUP · Less than 5% · control person
- ListedPELLER, BRIAN · CHIEF OPERATING OFFICER · Less than 5% · control person
- ListedSUMMITTX INVESTORS, LLC · GENERAL PARTNER · Less than 5% · control person
- ListedTHRU LINE GP LLC · GENERAL PARTNER · General partner, trustee or manager · indirect via THRU LINE, L.P.
- ListedTHRU LINE, L.P. · LIMITED PARTNER · 25–50% · indirect via CRESTLINE MANAGEMENT, L.P.
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)
- INVESCO QQQ TR$112.9M +67.8%
- ANALOG DEVICES INC$63.7M +1208.6%
- 3M CO$23.3M +923.7%
- NXP SEMICONDUCTORS N V$23.1M +212.2%
- APPLIED MATLS INC$22.0M +103.6%
Top Trims
- INVESCO EXCHANGE TRADED FD T-$26.2M -58.3%
- MERITAGE HOMES CORP-$24.0M -82.4%
- GE AEROSPACE-$24.0M -93.9%
- TOPBUILD COR-$18.0M -66.0%
- GRIFFON CORP-$16.6M -55.1%
New Positions
- SELECT SECTOR SPDR TR$35.8M
- MICRON TECHNOLOGY INC$25.9M
- ADVANCED MICRO DEVICES INC$25.0M
- LOWES COS INC$23.0M
- ROKU INC$19.1M
Exited Positions
- COTERRA ENERGY INC$28.3M
- NVIDIA CORPORATION$25.1M
- KIRBY CORP$22.1M
- TAIWAN SEMICONDUCTOR MANUFAC$17.6M
- TERNS PHARMACEUTICALS INC$16.5M
SummitTX Capital, L.P. 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 | STATE STR SPDR S&P 500 ETF T | SPY | 78462F103 | $478.4M | 12.31% | 640,689 | SH |
| 2 | INVESCO QQQ TR | QQQ | 46090E103 | $279.3M | 7.19% | 379,268 | SH |
| 3 | ANALOG DEVICES INC | ADI | 032654105 | $69.0M | 1.78% | 173,745 | SH |
| 4 | MKS INC. | MKSI | 55306N104 | $58.7M | 1.51% | 132,009 | SH |
| 5 | ASML HLDG NV | ASML | N07059210 | $53.4M | 1.37% | 26,839 | SH |
| 6 | APPLIED MATLS INC | AMAT | 038222105 | $43.2M | 1.11% | 59,729 | SH |
| 7 | SELECT SECTOR SPDR TR | XLI | 81369Y704 | $35.8M | 0.92% | 193,167 | SH |
| 8 | NXP SEMICONDUCTORS N V | NXPI | N6596X109 | $33.9M | 0.87% | 120,753 | SH |
| 9 | AMAZON COM INC | AMZN | 023135106 | $31.9M | 0.82% | 133,823 | SH |
| 10 | STATE STR SPDR S&P 500 ETF T Put | SPY | 78462F103 | $29.9M | 0.77% | 40,000 | SH |
| 11 | OREILLY AUTOMOTIVE INC | ORLY | 67103H107 | $27.6M | 0.71% | 299,494 | SH |
| 12 | CBRE GROUP INC | CBRE | 12504L109 | $27.2M | 0.70% | 201,868 | SH |
| 13 | MICRON TECHNOLOGY INC | MU | 595112103 | $25.9M | 0.67% | 22,430 | SH |
| 14 | 3M CO | MMM | 88579Y101 | $25.8M | 0.66% | 159,275 | SH |
| 15 | LPL FINL HLDGS INC | LPLA | 50212V100 | $25.3M | 0.65% | 89,812 | SH |
| 16 | ADVANCED MICRO DEVICES INC | AMD | 007903107 | $25.0M | 0.64% | 42,959 | SH |
| 17 | ONTO INNOVATION INC | ONTO | 683344105 | $24.9M | 0.64% | 65,734 | SH |
| 18 | STATE STR SPDR S&P MIDCAP 40 | MDY | 78467Y107 | $24.2M | 0.62% | 34,353 | SH |
| 19 | LOWES COS INC | LOW | 548661107 | $23.0M | 0.59% | 104,202 | SH |
| 20 | ALLIANT ENERGY CORP | LNT | 018802108 | $22.3M | 0.57% | 292,300 | SH |
| 21 | ZIONS BANCORPORATION NATL AS | ZION | 989701107 | $21.9M | 0.56% | 316,241 | SH |
| 22 | ELECTRONIC ARTS INC Put | EA | 285512109 | $20.5M | 0.53% | 100,000 | SH |
| 23 | LINDE PLC | LIN | G54950103 | $20.1M | 0.52% | 38,639 | SH |
| 24 | WALMART INC | WMT | 931142103 | $20.0M | 0.52% | 176,720 | SH |
| 25 | US BANCORP | USB | 902973304 | $19.6M | 0.50% | 324,737 | SH |
| 26 | AMEREN CORP | AEE | 023608102 | $19.4M | 0.50% | 171,867 | SH |
| 27 | CISCO SYS INC | CSCO | 17275R102 | $19.4M | 0.50% | 165,163 | SH |
| 28 | NVR INC | NVR | 62944T105 | $19.3M | 0.50% | 2,827 | SH |
| 29 | ROKU INC | ROKU | 77543R102 | $19.1M | 0.49% | 138,293 | SH |
| 30 | COSTCO WHOLESALE CORPORATION | COST | 22160K105 | $18.9M | 0.49% | 20,184 | SH |
| 31 | INVESCO EXCHANGE TRADED FD T | RSP | 46137V357 | $18.8M | 0.48% | 88,212 | SH |
| 32 | INTERCONTINENTAL EXCHANGE IN | ICE | 45866F104 | $18.6M | 0.48% | 151,214 | SH |
| 33 | INVESCO QQQ TR Put | QQQ | 46090E103 | $18.4M | 0.47% | 25,000 | SH |
| 34 | TOLL BROTHERS INC | TOL | 889478103 | $18.2M | 0.47% | 110,615 | SH |
| 35 | WARNER BROS DISCOVERY INC | WBD | 934423104 | $18.0M | 0.46% | 675,000 | SH |
| 36 | WARNER BROS DISCOVERY INC Put | WBD | 934423104 | $17.6M | 0.45% | 659,500 | SH |
| 37 | GAMING & LEISURE P | GLPI | 36467J108 | $16.8M | 0.43% | 376,964 | SH |
| 38 | FLEX LTD | FLEX | Y2573F102 | $16.4M | 0.42% | 101,055 | SH |
| 39 | LAUDER ESTEE COS INC | EL | 518439104 | $16.2M | 0.42% | 204,861 | SH |
| 40 | QXO INC | QXO | 82846H405 | $16.0M | 0.41% | 926,652 | SH |
| 41 | CHOICE HOTELS INTL INC | CHH | 169905106 | $16.0M | 0.41% | 144,726 | SH |
| 42 | LIBERTY BROADBAND CORP | LBRDK | 530307305 | $15.9M | 0.41% | 478,413 | SH |
| 43 | GALAXY DIGITAL INC. | GLXY | 36317J209 | $15.7M | 0.40% | 573,780 | SH |
| 44 | TRAVEL PLUS LEISURE CO | TNL | 894164102 | $15.6M | 0.40% | 204,546 | SH |
| 45 | DEVON ENERGY CORP NEW | DVN | 25179M103 | $15.3M | 0.39% | 369,498 | SH |
| 46 | FLOOR & DECOR HLDGS INC | FND | 339750101 | $15.2M | 0.39% | 256,242 | SH |
| 47 | ECOLAB INC | ECL | 278865100 | $15.1M | 0.39% | 54,219 | SH |
| 48 | SEAGATE TECHNOLOGY HLDNGS PL | STX | G7997R103 | $15.0M | 0.39% | 15,525 | SH |
| 49 | BANK OF AMER CORP | BAC | 060505104 | $15.0M | 0.39% | 262,636 | SH |
| 50 | MOTOROLA SOLUTIONS INC | MSI | 620076307 | $14.6M | 0.38% | 35,250 | SH |
Filing History
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-14 | $3.89B | 762 | 0002052310-26-000002 |
| 2026-03-31 | 2026-05-15 | $3.20B | 744 | 0000905148-26-002402 |
| 2025-12-31 | 2026-02-17 | $3.32B | 673 | 0000905148-26-000842 |
| 2025-09-30 | 2025-11-14 | $2.42B | 725 | 0000905148-25-004050 |
Filer Information
Address
201 MAIN ST.SUITE 1900
FORT WORTH, TX 76102
Phone
(817) 769-1578
Filing Manager
SummitTX Capital, L.P.
FORT WORTH, TX
Signatory
Courtney Posner
Chief Compliance Officer