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 | |
|---|---|---|---|---|---|---|
5626
PUT
MarketAxess Holdings
MKTX
$5.73B
| $67K | ﹤0.01% |
300
-2,000
| -87% | -$440K |
|
|
MREO
5627
PUT
Mereo BioPharma
MREO
$50.3M
| $67K | ﹤0.01% |
25,000
+1,800
| +8% | +$4.34K |
|
|
ORC
5628
CALL
Orchid Island Capital
ORC
$1.32B
| $67K | ﹤0.01% |
9,600
+8,200
| +586% | +$56.8K |
|
|
SGMO
5629
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $67K | ﹤0.01% |
125,333
-116,961
| -48% | -$69.5K |
|
|
HTO
5630
CALL
H2O America
HTO
$2.59B
| $67K | ﹤0.01% |
+1,300
| New | +$69.1K |
|
5631
PUT
Tanger
SKT
$4.71B
| $67K | ﹤0.01% |
2,200
+500
| +29% | +$15.3K |
|
|
SNV
5632
PUT
DELISTED
Synovus
SNV
| $67K | ﹤0.01% |
1,300
-200
| -13% | -$9.19K |
|
5633
PUT
Target Hospitality
TH
$1.44B
| $67K | ﹤0.01% |
9,500
-13,800
| -59% | -$95.9K |
|
5634
Vitesse Energy
VTS
$636M
| $67K | ﹤0.01% |
+3,076
| New | +$67.4K |
|
5635
State Street Utilities Select Sector SPDR ETF
XLU
$23B
| $67K | ﹤0.01% |
1,662
-76,892
| -98% | -$3.06M |
|
|
BTCL
5636
T-Rex 2X Long Bitcoin Daily Target ETF
BTCL
$23.1M
| $67K | ﹤0.01% |
1,265
-2,835
| -69% | -$133K |
|
|
CLDT
5637
PUT
Chatham Lodging
CLDT
$622M
| $66K | ﹤0.01% |
+9,600
| New | +$67K |
|
5638
CALL
Cogent Biosciences
COGT
$7.07B
| $66K | ﹤0.01% |
9,300
+8,900
| +2,225% | +$49.3K |
|
5639
Invesco DB Oil Fund
DBO
$396M
| $66K | ﹤0.01% |
5,004
+4,379
| +701% | +$56.8K |
|
5640
GrafTech
EAF
$169M
| $66K | ﹤0.01% |
6,887
+306
| +5% | +$2.71K |
|
5641
Empire State Realty Trust
ESRT
$862M
| $66K | ﹤0.01% |
8,260
+7,608
| +1,167% | +$58.2K |
|
5642
PUT
GeoPark
GPRK
$622M
| $66K | ﹤0.01% |
10,200
+1,000
| +11% | +$6.83K |
|
5643
PUT
Hudbay
HBM
$10.1B
| $66K | ﹤0.01% |
6,300
| – | – |
|
5644
PUT
St. Joe Company
JOE
$3.59B
| $66K | ﹤0.01% |
1,400
-5,800
| -81% | -$259K |
|
5645
CALL
Meritage Homes
MTH
$4.61B
| $66K | ﹤0.01% |
1,000
-100
| -9% | -$6.63K |
|
5646
PUT
Olin
OLN
$2.53B
| $66K | ﹤0.01% |
3,300
+1,900
| +136% | +$39.5K |
|
5647
CALL
Omeros
OMER
$863M
| $66K | ﹤0.01% |
22,200
-3,400
| -13% | -$16.9K |
|
5648
CALL
Rush Enterprises Class A
RUSHA
$6.21B
| $66K | ﹤0.01% |
1,300
-8,100
| -86% | -$411K |
|
5649
RXO
RXO
$3.39B
| $66K | ﹤0.01% |
4,247
+3,091
| +267% | +$46.9K |
|
5650
Wrap Technologies
WRAP
$98.1M
| $66K | ﹤0.01% |
42,327
+28,661
| +210% | +$43.2K |
|
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.