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 | |
|---|---|---|---|---|---|---|
|
SEZL
2126
CALL
Sezzle
SEZL
$3.75B
| $1.85M | ﹤0.01% |
10,800
-7,600
| -41% | -$801K |
|
2127
PUT
Ferguson
FERG
$43.1B
| $1.85M | ﹤0.01% |
7,800
+1,200
| +18% | +$290K |
|
|
SVM
2128
CALL
Silvercorp Metals
SVM
$2.51B
| $1.85M | ﹤0.01% |
183,200
-92,000
| -33% | -$1.11M |
|
2129
Duke Energy
DUK
$88.4B
| $1.85M | ﹤0.01% |
+14,605
| New | +$1.84M |
|
2130
CALL
Danaos Corp
DAC
$2.81B
| $1.85M | ﹤0.01% |
15,100
+13,000
| +619% | +$1.62M |
|
2131
PUT
Return Stacked Bonds & Managed Futures ETF
RSBT
$160M
| $1.84M | ﹤0.01% |
43,400
+29,600
| +214% | +$569K |
|
2132
Sweetgreen
SG
$981M
| $1.84M | ﹤0.01% |
209,173
+27,257
| +15% | +$208K |
|
2133
CALL
Novavax
NVAX
$1.75B
| $1.84M | ﹤0.01% |
195,300
-170,500
| -47% | -$1.53M |
|
|
DFTX
2134
CALL
Definium Therapeutics
DFTX
$4.86B
| $1.83M | ﹤0.01% |
39,000
+25,300
| +185% | +$625K |
|
2135
PUT
United States Copper Index Fund
CPER
$759M
| $1.83M | ﹤0.01% |
48,600
+16,600
| +52% | +$626K |
|
2136
PUT
Viking Therapeutics
VKTX
$4.15B
| $1.83M | ﹤0.01% |
47,000
+24,100
| +105% | +$778K |
|
2137
Vertiv
VRT
$97.5B
| $1.83M | ﹤0.01% |
+5,465
| New | +$1.73M |
|
2138
CALL
LSB Industries
LXU
$712M
| $1.83M | ﹤0.01% |
169,100
-2,000
| -1% | -$26.8K |
|
2139
CALL
Hycroft Mining Holding Corp
HYMC
$2B
| $1.83M | ﹤0.01% |
78,100
+39,300
| +101% | +$1.33M |
|
2140
CALL
ProShares UltraShort Health Care
RXD
$3.05M
| $1.82M | ﹤0.01% |
52,300
+37,600
| +256% | +$741K |
|
2141
CALL
Groupon
GRPN
$866M
| $1.82M | ﹤0.01% |
75,800
+55,900
| +281% | +$923K |
|
2142
Icahn Enterprises
IEP
$4.95B
| $1.82M | ﹤0.01% |
252,509
+98,873
| +64% | +$761K |
|
2143
CALL
Lattice Semiconductor
LSCC
$18.2B
| $1.82M | ﹤0.01% |
11,900
-10,400
| -47% | -$1.34M |
|
2144
Procure Space ETF
UFO
$556M
| $1.82M | ﹤0.01% |
35,914
-26,307
| -42% | -$1.42M |
|
2145
Trevi Therapeutics
TRVI
$2.05B
| $1.82M | ﹤0.01% |
97,557
+77,280
| +381% | +$1.12M |
|
2146
CALL
Achieve Life Sciences
ACHV
$776M
| $1.82M | ﹤0.01% |
278,300
+135,700
| +95% | +$647K |
|
2147
Cadence Design Systems
CDNS
$89.8B
| $1.82M | ﹤0.01% |
4,840
+4,829
| +43,900% | +$1.69M |
|
2148
PUT
uniQure
QURE
$2.65B
| $1.81M | ﹤0.01% |
39,400
-199,900
| -84% | -$5.23M |
|
2149
PUT
Jefferies Financial Group
JEF
$11B
| $1.81M | ﹤0.01% |
36,300
-17,500
| -33% | -$902K |
|
2150
CALL
BJs Wholesale Club
BJ
$11.8B
| $1.81M | ﹤0.01% |
20,800
+3,600
| +21% | +$330K |
|
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.