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 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2276
CALL
Gulfport Energy Corp
GPOR
$2.73B
| $1.56M | ﹤0.01% |
+9,200
| New | +$1.66M |
|
|
WCN
2277
Waste Connections
WCN
$39.1B
| $1.56M | ﹤0.01% |
9,365
+7,394
| +375% | +$1.17M |
|
2278
PUT
Steel Dynamics
STLD
$33.5B
| $1.56M | ﹤0.01% |
6,800
-1,900
| -22% | -$445K |
|
2279
CALL
Cohu
COHU
$3.17B
| $1.56M | ﹤0.01% |
21,100
+7,800
| +59% | +$390K |
|
2280
A10 Networks
ATEN
$1.87B
| $1.56M | ﹤0.01% |
41,672
+29,955
| +256% | +$870K |
|
|
SERV
2281
PUT
Serve Robotics
SERV
$386M
| $1.56M | ﹤0.01% |
236,500
+201,000
| +566% | +$1.68M |
|
2282
PUT
Apple Hospitality REIT
APLE
$3.82B
| $1.55M | ﹤0.01% |
92,400
+83,500
| +938% | +$1.19M |
|
2283
Dutch Bros
BROS
$5.23B
| $1.55M | ﹤0.01% |
+21,602
| New | +$1.24M |
|
2284
CALL
Freshworks
FRSH
$3.27B
| $1.55M | ﹤0.01% |
153,100
+11,000
| +8% | +$98K |
|
2285
CALL
Cabaletta Bio
CABA
$351M
| $1.55M | ﹤0.01% |
497,900
+87,900
| +21% | +$289K |
|
2286
PUT
Regal Rexnord
RRX
$10.4B
| $1.55M | ﹤0.01% |
6,500
+4,500
| +225% | +$940K |
|
|
AVB
2287
PUT
DELISTED
AvalonBay Communities
AVB
| $1.55M | ﹤0.01% |
8,200
+100
| +1% | +$18.1K |
|
2288
PUT
Sysco
SYY
$37.6B
| $1.55M | ﹤0.01% |
18,500
-12,200
| -40% | -$924K |
|
2289
CALL
SM Energy
SM
$8.07B
| $1.55M | ﹤0.01% |
59,200
-4,900
| -8% | -$147K |
|
2290
PUT
Omnicom Group
OMC
$20.9B
| $1.54M | ﹤0.01% |
21,200
-20,000
| -49% | -$1.51M |
|
2291
Grab
GRAB
$12.8B
| $1.54M | ﹤0.01% |
409,315
-320,935
| -44% | -$1.17M |
|
2292
Entergy
ETR
$47.1B
| $1.54M | ﹤0.01% |
13,431
+8,486
| +172% | +$957K |
|
2293
CALL
Cognex
CGNX
$9.87B
| $1.54M | ﹤0.01% |
21,300
+18,100
| +566% | +$1.1M |
|
2294
American Airlines Group
AAL
$9.18B
| $1.54M | ﹤0.01% |
85,215
-91,769
| -52% | -$1.23M |
|
2295
CALL
RUM Group Inc
RUM
$4.14B
| $1.54M | ﹤0.01% |
242,800
-6,300
| -3% | -$44.8K |
|
2296
PUT
Iovance Biotherapeutics
IOVA
$4.98B
| $1.54M | ﹤0.01% |
369,600
-54,700
| -13% | -$208K |
|
|
BRUN
2297
PUT
Boost Run Inc
BRUN
$1.33B
| $1.54M | ﹤0.01% |
+39,600
| New | +$1.23M |
|
2298
PUT
Pultegroup
PHM
$22.8B
| $1.54M | ﹤0.01% |
11,200
+3,000
| +37% | +$364K |
|
2299
PUT
B2Gold
BTG
$7.24B
| $1.54M | ﹤0.01% |
410,800
+41,000
| +11% | +$188K |
|
2300
PUT
OppFi
OPFI
$535M
| $1.53M | ﹤0.01% |
154,400
-383,900
| -71% | -$3.32M |
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.