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 | |
|---|---|---|---|---|---|---|
901
CALL
TeraWulf
WULF
$9.94B
| $9.81M | 0.01% |
2,239,000
-754,500
| -25% | -$2.58M |
|
902
CALL
GeneDx Holdings
WGS
$1.88B
| $9.72M | 0.01% |
105,300
+76,800
| +269% | +$6.03M |
|
903
CALL
Southwest Airlines
LUV
$21.9B
| $9.71M | 0.01% |
299,300
-198,500
| -40% | -$5.98M |
|
|
P
904
PUT
Everpure Inc
P
$25B
| $9.71M | 0.01% |
168,600
+51,700
| +44% | +$2.57M |
|
905
PUT
Carbon Collective Climate Solutions US Equity ETF
CCSO
$45.8M
| $9.69M | 0.01% |
501,800
+233,100
| +87% | +$4.8M |
|
906
PUT
AeroVironment
AVAV
$8.03B
| $9.66M | 0.01% |
33,900
+21,000
| +163% | +$3.55M |
|
907
Direxion Daily TSLA Bull 2X ETF
TSLL
$2.55B
| $9.64M | 0.01% |
816,632
+544,253
| +200% | +$6.31M |
|
908
CALL
VanEck Durable High Dividend ETF
DURA
$38.4M
| $9.64M | 0.01% |
106,700
+8,300
| +8% | +$264K |
|
909
CALL
Moody's
MCO
$82.5B
| $9.63M | 0.01% |
19,200
+7,600
| +66% | +$3.52M |
|
910
CALL
CRISPR Therapeutics
CRSP
$4.68B
| $9.62M | 0.01% |
197,800
-17,800
| -8% | -$689K |
|
911
CALL
SoundHound AI
SOUN
$2.71B
| $9.62M | 0.01% |
896,400
-442,400
| -33% | -$4.17M |
|
912
American Airlines Group
AAL
$8.96B
| $9.55M | 0.01% |
851,320
+373,085
| +78% | +$3.99M |
|
913
CALL
Amplify Online Retail ETF
IBUY
$106M
| $9.5M | 0.01% |
619,700
-115,800
| -16% | -$7.41M |
|
914
CALL
Whirlpool
WHR
$2.31B
| $9.49M | 0.01% |
93,600
+12,500
| +15% | +$1.04M |
|
915
PUT
Rubrik
RBRK
$14.9B
| $9.47M | 0.01% |
105,700
-52,100
| -33% | -$4.12M |
|
916
CALL
Golar LNG
GLNG
$5.07B
| $9.46M | 0.01% |
229,800
+77,000
| +50% | +$3.04M |
|
917
PUT
Fidelity Wise Origin Bitcoin Fund
FBTC
$12B
| $9.46M | 0.01% |
100,700
+38,600
| +62% | +$3.32M |
|
918
CALL
Teradyne
TER
$58.5B
| $9.46M | 0.01% |
105,200
+18,000
| +21% | +$1.44M |
|
919
CALL
Mondelez International
MDLZ
$77.1B
| $9.46M | 0.01% |
140,200
-131,200
| -48% | -$8.75M |
|
920
CALL
Li Auto
LI
$12.3B
| $9.43M | 0.01% |
347,800
-279,800
| -45% | -$7.38M |
|
921
PUT
Diamondback Energy
FANG
$57.8B
| $9.43M | 0.01% |
68,600
-13,300
| -16% | -$1.84M |
|
922
CALL
Alamos Gold
AGI
$12.3B
| $9.37M | 0.01% |
352,900
-19,400
| -5% | -$519K |
|
923
PUT
2x Long VIX Futures ETF
UVIX
$293M
| $9.36M | 0.01% |
21,560
-6,485
| -23% | -$4.98M |
|
|
924
PUT
Li Auto
LI
$12.3B
| $9.36M | 0.01% |
345,100
-163,500
| -32% | -$4.32M |
|
925
PUT
Listed Funds Trust Roundhill Magnificent Seven ETF
MAGS
$3.91B
| $9.35M | 0.01% |
169,100
-132,300
| -44% | -$6.54M |
|
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.