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 | |
|---|---|---|---|---|---|---|
6126
CALL
ReposiTrak
TRAK
$160M
| $41K | ﹤0.01% |
2,100
| – | – |
|
6127
Direxion Daily Robotics Artificial Intelligence & Automation Index Bull 2X ETF
UBOT
$21.7M
| $41K | ﹤0.01% |
1,909
+1,430
| +299% | +$26.2K |
|
6128
PUT
Zai Lab
ZLAB
$2.07B
| $41K | ﹤0.01% |
1,200
-1,200
| -50% | -$39.5K |
|
|
CTEV
6129
Claritev Corp
CTEV
$399M
| $41K | ﹤0.01% |
912
-26,624
| -97% | -$766K |
|
6130
PUT
Acadia Healthcare
ACHC
$2.55B
| $40K | ﹤0.01% |
1,800
-27,300
| -94% | -$647K |
|
6131
PUT
Alight
ALIT
$534M
| $40K | ﹤0.01% |
355
-2,435
| -87% | -$261K |
|
6132
CALL
Algonquin Power & Utilities
AQN
$4.59B
| $40K | ﹤0.01% |
7,100
-6,400
| -47% | -$35.1K |
|
6133
PUT
Aquestive Therapeutics
AQST
$452M
| $40K | ﹤0.01% |
12,300
+6,700
| +120% | +$19.2K |
|
6134
PUT
AvalonBay Communities
AVB
$27.5B
| $40K | ﹤0.01% |
200
-900
| -82% | -$184K |
|
6135
CALL
Aviat Networks
AVNW
$253M
| $40K | ﹤0.01% |
1,700
-1,200
| -41% | -$24.2K |
|
6136
CALL
Caledonia Mining Corp
CMCL
$351M
| $40K | ﹤0.01% |
2,100
+200
| +11% | +$3.13K |
|
6137
PUT
Daktronics
DAKT
$946M
| $40K | ﹤0.01% |
2,700
-2,600
| -49% | -$35.7K |
|
6138
CALL
Embecta
EMBC
$218M
| $40K | ﹤0.01% |
4,200
+3,700
| +740% | +$41.6K |
|
6139
PUT
East-West Bancorp
EWBC
$17.8B
| $40K | ﹤0.01% |
400
-7,700
| -95% | -$682K |
|
6140
PUT
Forestar Group
FOR
$1.48B
| $40K | ﹤0.01% |
2,000
-8,000
| -80% | -$158K |
|
6141
CALL
HUB Group
HUBG
$2.92B
| $40K | ﹤0.01% |
1,200
-2,900
| -71% | -$97.3K |
|
6142
PUT
ICL Group
ICL
$6.58B
| $40K | ﹤0.01% |
5,900
-29,300
| -83% | -$191K |
|
6143
CALL
Ingredion
INGR
$6.42B
| $40K | ﹤0.01% |
300
-1,300
| -81% | -$176K |
|
|
KALV
6144
DELISTED
KalVista Pharmaceuticals
KALV
| $40K | ﹤0.01% |
+3,543
| New | +$43.3K |
|
|
KW
6145
DELISTED
Kennedy-Wilson Holdings
KW
| $40K | ﹤0.01% |
+5,991
| New | +$40K |
|
6146
PUT
MediWound
MDWD
$184M
| $40K | ﹤0.01% |
2,100
+200
| +11% | +$3.77K |
|
6147
PUT
Maravai LifeSciences
MRVI
$972M
| $40K | ﹤0.01% |
16,700
-1,100
| -6% | -$2.31K |
|
|
FIRY
6148
CALL
Firy Inc
FIRY
$154M
| $40K | ﹤0.01% |
5,900
+700
| +13% | +$3.89K |
|
6149
PUT
SoundThinking
SSTI
$108M
| $40K | ﹤0.01% |
3,100
-18,700
| -86% | -$292K |
|
|
STR
6150
CALL
DELISTED
Sitio Royalties
STR
| $40K | ﹤0.01% |
2,200
-41,900
| -95% | -$752K |
|
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.