Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
576
CALL
Zoom
ZM
$25.2B
| $19.4M | 0.01% |
248,300
-143,300
| -37% | -$11.1M |
|
577
Oracle
ORCL
$362B
| $19.3M | 0.01% |
+88,074
| New | +$14.2M |
|
578
PUT
Warner Bros
WBD
$64.8B
| $19.3M | 0.01% |
1,679,900
-163,600
| -9% | -$1.53M |
|
579
PUT
BP
BP
$112B
| $19.2M | 0.01% |
642,700
-212,400
| -25% | -$6.23M |
|
580
CALL
Halliburton
HAL
$27.6B
| $19.2M | 0.01% |
942,000
-533,000
| -36% | -$11.2M |
|
581
PUT
Take-Two Interactive
TTWO
$43.4B
| $19.2M | 0.01% |
79,000
-63,600
| -45% | -$14.3M |
|
582
Energy Transfer Partners
ET
$70.1B
| $19.1M | 0.01% |
1,051,640
-4,128
| -0.4% | -$72K |
|
583
CALL
Invesco S&P SmallCap Low Volatility ETF
XSLV
$247M
| $18.8M | 0.01% |
279,300
+76,100
| +37% | +$3.43M |
|
584
PUT
Albemarle
ALB
$13.9B
| $18.8M | 0.01% |
300,600
-199,500
| -40% | -$11.8M |
|
585
PUT
Caesars Entertainment
CZR
$6.1B
| $18.8M | 0.01% |
662,900
+144,400
| +28% | +$3.93M |
|
586
PUT
Norwegian Cruise Line
NCLH
$8.87B
| $18.8M | 0.01% |
926,700
+72,400
| +8% | +$1.3M |
|
|
MPT
587
PUT
Medical Properties Trust
MPT
$2.88B
| $18.8M | 0.01% |
4,352,000
+514,400
| +13% | +$2.54M |
|
588
Chipotle Mexican Grill
CMG
$41.3B
| $18.8M | 0.01% |
+333,998
| New | +$17M |
|
589
PUT
Teck Resources
TECK
$28B
| $18.7M | 0.01% |
463,900
+136,100
| +42% | +$4.92M |
|
590
CALL
Rigetti Computing
RGTI
$5.06B
| $18.7M | 0.01% |
1,579,300
+60,500
| +4% | +$638K |
|
591
CALL
Blackrock
BLK
$164B
| $18.7M | 0.01% |
17,800
+5,300
| +42% | +$5.01M |
|
592
PUT
Medtronic
MDT
$105B
| $18.6M | 0.01% |
213,900
-64,100
| -23% | -$5.44M |
|
593
CALL
CSX Corp
CSX
$92.8B
| $18.6M | 0.01% |
570,900
+96,200
| +20% | +$2.89M |
|
594
CALL
ON Semiconductor
ON
$35.9B
| $18.6M | 0.01% |
354,600
-55,600
| -14% | -$2.42M |
|
595
PUT
Trump Media & Technology Group
DJT
$2.56B
| $18.4M | 0.01% |
1,022,000
+412,200
| +68% | +$8.97M |
|
596
CALL
Oscar Health
OSCR
$8.89B
| $18.4M | 0.01% |
858,800
+378,300
| +79% | +$5.62M |
|
597
CALL
Wheaton Precious Metals
WPM
$50.6B
| $18.4M | 0.01% |
204,600
-88,100
| -30% | -$7.42M |
|
598
PUT
Centene
CNC
$32.5B
| $18.3M | 0.01% |
336,300
+222,100
| +194% | +$13M |
|
599
PUT
Astera Labs
ALAB
$56.7B
| $18.1M | 0.01% |
200,500
+2,000
| +1% | +$158K |
|
600
CALL
Enterprise Products Partners
EPD
$84.1B
| $18.1M | 0.01% |
582,800
-338,200
| -37% | -$10.5M |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.