JAT Capital Mgmt LP — 13F Holdings & Portfolio
CIK 1834438 · latest 13F-HR filed 2026-08-14
JAT Capital Mgmt LP manages $47.4M in 13F-reported U.S. long-equity assets across 16 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are WDC (28.97%), ORCL (15.94%), MU (11.17%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 10 new positions and exited 4; 1 existing position rose in reported value and 4 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.
Long-equity book
Distinct positions
Filed 2026-08-14
vs 2026-03-31
Portfolio charts
Latest quarter's book, what changed, and how the portfolio has evolved across filings.
Portfolio map
Q2 26Box 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 = 93.8%Cumulative share of the portfolio held in the largest N positions.
As of the firm’s regulatory filing dated Mar 30, 2015.
| Name | Title / Status | Ownership | Type |
|---|---|---|---|
| JAT CAPITAL MANAGEMENT, L.L.C. Control | GENERAL PARTNER since Jul 2007 | Less than 5% | Domestic Entity |
| MORGAN, JUSTIN, D Control | CHIEF FINANCIAL OFFICER since Jan 2012 | Less than 5% | Individual |
| PALUMBO, KENNETH, FRANCIS Control | PRESIDENT AND CHIEF OPERATING OFFICER since Jul 2011 | Less than 5% | Individual |
| THALER, JOHN, ANTHONY Control | PRINCIPAL AND PORTFOLIO MANAGER since Jul 2007 | 75% or more | Individual |
| ZWEIG, MATTHEW, J. Control | GENERAL COUNSEL AND CHIEF COMPLIANCE OFFICER since Oct 2011 | Less than 5% | Individual |
| THALER, JOHN, ANTHONY Control Indirect owner via JAT CAPITAL MANAGEMENT, L.L.C. | MANAGING MEMBER since Jul 2007 | 75% or more | Individual |
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 Trims
- META PLATFORMS INC-$12.4M -97.7%
- AMAZON COM INC-$9.7M -97.0%
- COHERENT CORP-$7.0M -78.1%
- MICRON TECHNOLOGY INC-$6.0M -53.2%
New Positions
- WESTERN DIGITAL CORP$13.7M
- ORACLE CORP$7.6M
- ROBINHOOD MKTS INC$5.2M
- IREN LIMITED$2.4M
- SEAGATE TECHNOLOGY HLDNGS PL$1.3M
Exited Positions
- NVIDIA CORPORATION COM$9.4M
- CONSTELLATION ENERGY CORP COM$2.1M
- CORE SCIENTIFIC INC NEW COM$976.5K
- INTEL CORP COM$919.4K
JAT Capital Mgmt LP 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 | WESTERN DIGITAL CORP | WDC | 958102105 | $13.7M | 28.97% | 21,500 | SH |
| 2 | ORACLE CORP | ORCL | 68389X105 | $7.6M | 15.94% | 51,560 | SH |
| 3 | MICRON TECHNOLOGY INC | MU | 595112103 | $5.3M | 11.17% | 4,587 | SH |
| 4 | ROBINHOOD MKTS INC | HOOD | 770700102 | $5.2M | 10.87% | 51,372 | SH |
| 5 | APPLIED OPTOELECTRONICS INC | AAOI | 03823U102 | $3.9M | 8.28% | 26,500 | SH |
| 6 | IREN LIMITED | IREN | Q4982L109 | $2.4M | 5.16% | 53,500 | SH |
| 7 | LUMENTUM HLDGS INC | LITE | 55024U109 | $2.0M | 4.25% | 2,350 | SH |
| 8 | COHERENT CORP | COHR | 19247G107 | $2.0M | 4.16% | 5,000 | SH |
| 9 | SEAGATE TECHNOLOGY HLDNGS PL | STX | G7997R103 | $1.3M | 2.83% | 1,390 | SH |
| 10 | MARVELL TECHNOLOGY INC | MRVL | 573874104 | $1.0M | 2.19% | 3,485 | SH |
| 11 | SERVICENOW INC | NOW | 81762P102 | $794.2K | 1.68% | 8,000 | SH |
| 12 | SPACE EXPLORATION TECHN CORP | SPCX | 84615Q103 | $768.9K | 1.62% | 4,500 | SH |
| 13 | VISTRA CORP | VST | 92840M102 | $396.6K | 0.84% | 2,500 | SH |
| 14 | PROSHARES TR II | VIXY | 74347Y730 | $387.5K | 0.82% | 18,202 | SH |
| 15 | AMAZON COM INC | AMZN | 023135106 | $297.9K | 0.63% | 1,250 | SH |
| 16 | META PLATFORMS INC | META | 30303M102 | $285.6K | 0.60% | 507 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-14 | $47.4M | 16 | 0001892688-26-000130 |
| 2026-03-31 | 2026-05-15 | $59.3M | 10 | 0001892688-26-000086 |
| 2025-12-31 | 2026-02-17 | $92.9M | 16 | 0001892688-26-000045 |
| 2025-09-30 | 2025-11-14 | $46.3M | 17 | 0001892688-25-000199 |
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