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 | |
|---|---|---|---|---|---|---|
4151
PUT
Zevra Therapeutics
ZVRA
$671M
| $320K | ﹤0.01% |
22,300
-1,000
| -4% | -$11.1K |
|
4152
CALL
Cedar Fair
FUN
$1.18B
| $320K | ﹤0.01% |
15,000
-21,400
| -59% | -$437K |
|
4153
PUT
MannKind Corp
MNKD
$1.08B
| $320K | ﹤0.01% |
75,000
-90,800
| -55% | -$295K |
|
|
SF
4154
Stifel
SF
$10.6B
| $319K | ﹤0.01% |
+4,577
| New | +$341K |
|
4155
PUT
CubeSmart
CUBE
$8.42B
| $318K | ﹤0.01% |
8,000
+6,600
| +471% | +$263K |
|
4156
Camping World
CWH
$330M
| $318K | ﹤0.01% |
41,662
+34,659
| +495% | +$251K |
|
4157
Cullinan Oncology
CGEM
$962M
| $318K | ﹤0.01% |
17,444
-187
| -1% | -$2.78K |
|
4158
CALL
Sabre
SABR
$848M
| $317K | ﹤0.01% |
151,800
-2,600
| -2% | -$4.56K |
|
4159
CALL
Goldman Sachs Physical Gold ETF Shares
AAAU
$2.5B
| $317K | ﹤0.01% |
8,000
+7,700
| +2,567% | +$343K |
|
4160
PUT
Invesco CurrencyShares Euro Currency Trust
FXE
$367M
| $316K | ﹤0.01% |
3,000
-58,200
| -95% | -$6.25M |
|
|
STEX
4161
CALL
Streamex Corp
STEX
$82.1M
| $316K | ﹤0.01% |
372,000
-26,900
| -7% | -$27.8K |
|
4162
PUT
Yelp
YELP
$954M
| $316K | ﹤0.01% |
12,900
+8,000
| +163% | +$199K |
|
4163
Reliance Steel & Aluminium
RS
$20B
| $316K | ﹤0.01% |
846
+27
| +3% | +$9.87K |
|
4164
CALL
Ovintiv
OVV
$16.5B
| $316K | ﹤0.01% |
6,000
-7,700
| -56% | -$440K |
|
|
KLC
4165
CALL
KinderCare Learning Companies
KLC
$238M
| $315K | ﹤0.01% |
74,100
+69,300
| +1,444% | +$256K |
|
4166
Honda
HMC
$42.2B
| $315K | ﹤0.01% |
11,607
+9,754
| +526% | +$248K |
|
4167
CALL
Floor & Decor
FND
$4.94B
| $315K | ﹤0.01% |
5,300
+1,500
| +39% | +$75.9K |
|
4168
CALL
BRC Group Holdings
RILY
$221M
| $314K | ﹤0.01% |
39,100
-43,900
| -53% | -$373K |
|
|
APGE
4169
DELISTED
Apogee Therapeutics
APGE
| $314K | ﹤0.01% |
2,368
-75,440
| -97% | -$6.8M |
|
4170
PUT
Chemours
CC
$2.13B
| $314K | ﹤0.01% |
15,300
-37,400
| -71% | -$856K |
|
4171
American International
AIG
$38.1B
| $314K | ﹤0.01% |
+4,210
| New | +$320K |
|
|
BORR
4172
Borr Drilling
BORR
$1.24B
| $314K | ﹤0.01% |
75,922
+15,570
| +26% | +$84K |
|
|
FIRY
4173
PUT
Firy Inc
FIRY
$208M
| $314K | ﹤0.01% |
30,800
+15,000
| +95% | +$104K |
|
4174
Sabra Healthcare REIT
SBRA
$5.06B
| $313K | ﹤0.01% |
16,035
-9,008
| -36% | -$179K |
|
4175
PUT
Vitesse Energy
VTS
$705M
| $312K | ﹤0.01% |
19,800
+16,300
| +466% | +$289K |
|
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.