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 | |
|---|---|---|---|---|---|---|
2351
CALL
Western Union
WU
$2.57B
| $1.54M | ﹤0.01% |
183,000
-52,900
| -22% | -$503K |
|
2352
PUT
XPO
XPO
$25B
| $1.54M | ﹤0.01% |
12,200
-7,400
| -38% | -$830K |
|
2353
CALL
Cummins
CMI
$91.7B
| $1.54M | ﹤0.01% |
4,700
-10,200
| -68% | -$3.16M |
|
2354
CALL
First Horizon
FHN
$12.1B
| $1.54M | ﹤0.01% |
72,500
-39,600
| -35% | -$755K |
|
2355
CALL
Perrigo
PRGO
$1.4B
| $1.54M | ﹤0.01% |
57,500
-42,300
| -42% | -$1.11M |
|
2356
Aurora
AUR
$11.7B
| $1.53M | ﹤0.01% |
292,871
+279,083
| +2,024% | +$1.75M |
|
2357
PUT
Trimble
TRMB
$12.3B
| $1.53M | ﹤0.01% |
20,200
-58,900
| -74% | -$3.96M |
|
2358
CALL
Coursera
COUR
$1.54B
| $1.53M | ﹤0.01% |
175,100
+76,900
| +78% | +$630K |
|
|
ETOR
2359
eToro Group
ETOR
$2.93B
| $1.53M | ﹤0.01% |
+23,024
| New | +$1.48M |
|
2360
CALL
Diageo
DEO
$46.2B
| $1.53M | ﹤0.01% |
15,200
-10,700
| -41% | -$1.16M |
|
2361
CALL
Burford Capital
BUR
$907M
| $1.53M | ﹤0.01% |
107,300
+80,700
| +303% | +$1.05M |
|
2362
CALL
NexGen Energy
NXE
$6.05B
| $1.53M | ﹤0.01% |
220,300
-182,800
| -45% | -$1.03M |
|
2363
CALL
BlackSky Technology
BKSY
$800M
| $1.52M | ﹤0.01% |
74,100
+19,000
| +34% | +$205K |
|
|
SW
2364
PUT
Smurfit Westrock
SW
$25.5B
| $1.52M | ﹤0.01% |
35,300
+27,400
| +347% | +$1.17M |
|
2365
CALL
Harmony Gold Mining
HMY
$9.92B
| $1.52M | ﹤0.01% |
108,900
-6,100
| -5% | -$92.2K |
|
2366
Global X Defense Tech ETF
SHLD
$7.07B
| $1.52M | ﹤0.01% |
+25,233
| New | +$1.36M |
|
2367
PUT
AMC Entertainment Holdings
AMC
$2.03B
| $1.51M | ﹤0.01% |
488,900
-432,400
| -47% | -$1.28M |
|
2368
CALL
Manchester United
MANU
$3.91B
| $1.51M | ﹤0.01% |
84,900
+83,800
| +7,618% | +$1.24M |
|
2369
PUT
IES Holdings
IESC
$12.5B
| $1.51M | ﹤0.01% |
5,100
-6,000
| -54% | -$1.41M |
|
2370
JetBlue
JBLU
$1.96B
| $1.51M | ﹤0.01% |
357,012
+236,065
| +195% | +$1.06M |
|
2371
Middleby
MIDD
$6.05B
| $1.5M | ﹤0.01% |
10,452
+4,807
| +85% | +$677K |
|
2372
CALL
Rambus
RMBS
$10.4B
| $1.5M | ﹤0.01% |
23,500
+700
| +3% | +$37.5K |
|
2373
PUT
Comfort Systems
FIX
$61B
| $1.5M | ﹤0.01% |
2,800
-6,200
| -69% | -$2.7M |
|
2374
Liquidia Corp
LQDA
$7.67B
| $1.5M | ﹤0.01% |
120,309
+41,282
| +52% | +$611K |
|
2375
PUT
Owens Corning
OC
$11.5B
| $1.5M | ﹤0.01% |
10,900
+1,200
| +12% | +$166K |
|
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.