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 | |
|---|---|---|---|---|---|---|
4851
PUT
Green Brick Partners
GRBK
$3.09B
| $144K | ﹤0.01% |
2,300
-8,200
| -78% | -$486K |
|
4852
PUT
Indivior Pharmaceuticals
INDV
$4.74B
| $144K | ﹤0.01% |
9,800
+300
| +3% | +$3.49K |
|
4853
Janux Therapeutics
JANX
$912M
| $144K | ﹤0.01% |
6,248
+3,061
| +96% | +$80.7K |
|
4854
CALL
Lindsay Corp
LNN
$1.14B
| $144K | ﹤0.01% |
+1,000
| New | +$134K |
|
4855
Madison Square Garden
MSGE
$3.59B
| $144K | ﹤0.01% |
3,620
+2,723
| +304% | +$96.2K |
|
4856
Pultegroup
PHM
$25.2B
| $144K | ﹤0.01% |
1,369
-3,924
| -74% | -$395K |
|
4857
Playboy Inc
PLBY
$136M
| $144K | ﹤0.01% |
89,451
-15,433
| -15% | -$19.8K |
|
4858
PUT
Steris
STE
$22.9B
| $144K | ﹤0.01% |
600
+400
| +200% | +$93.1K |
|
4859
Triple Flag Precious Metals
TFPM
$5.93B
| $144K | ﹤0.01% |
6,081
+3,967
| +188% | +$86.9K |
|
4860
CALL
Travel + Leisure Co
TNL
$4.76B
| $144K | ﹤0.01% |
2,800
-24,000
| -90% | -$1.13M |
|
4861
CALL
Calix
CALX
$2.24B
| $143K | ﹤0.01% |
2,700
-8,400
| -76% | -$359K |
|
4862
PUT
Grupo Cibest SA
CIB
$21.2B
| $143K | ﹤0.01% |
3,100
-100
| -3% | -$4.16K |
|
4863
Teucrium Corn Fund
CORN
$178M
| $143K | ﹤0.01% |
8,113
-1,876
| -19% | -$34.8K |
|
4864
PUT
Excelerate Energy
EE
$1.19B
| $143K | ﹤0.01% |
+4,900
| New | +$137K |
|
4865
CALL
Renaissance International IPO ETF
IPOS
$10.7M
| $143K | ﹤0.01% |
3,200
+3,000
| +1,500% | +$40.8K |
|
|
LAND
4866
Gladstone Land Corp
LAND
$365M
| $143K | ﹤0.01% |
14,119
-2,353
| -14% | -$23.1K |
|
4867
PUT
Monro
MNRO
$414M
| $143K | ﹤0.01% |
9,600
+5,600
| +140% | +$80.7K |
|
4868
Performance Food Group
PFGC
$18.3B
| $143K | ﹤0.01% |
1,636
-1,899
| -54% | -$158K |
|
4869
Packaging Corp of America
PKG
$22.2B
| $143K | ﹤0.01% |
764
-1,605
| -68% | -$303K |
|
4870
United States Antimony
UAMY
$728M
| $143K | ﹤0.01% |
+65,894
| New | +$187K |
|
|
ZYXI
4871
DELISTED
Zynex
ZYXI
| $143K | ﹤0.01% |
55,707
+35,322
| +173% | +$79.9K |
|
4872
CALL
Blink Charging
BLNK
$67.5M
| $142K | ﹤0.01% |
151,900
-7,100
| -4% | -$5.67K |
|
4873
Global X Robotics & Artificial Intelligence ETF
BOTZ
$3.14B
| $142K | ﹤0.01% |
+4,359
| New | +$129K |
|
4874
PUT
Black Stone Minerals
BSM
$3.14B
| $142K | ﹤0.01% |
10,900
+4,400
| +68% | +$60.8K |
|
4875
CALL
Covenant Logistics
CVLG
$1.04B
| $142K | ﹤0.01% |
5,900
+5,700
| +2,850% | +$123K |
|
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.