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 | Held Since | |
|---|---|---|---|---|---|---|---|
8201
CALL
Amplify Energy
AMPY
$184M
| $4.78K | ﹤0.01% |
1,200
-30,200
| -96% | -$155K |
2020 Q4
22 quarters
|
|
8202
PUT
United Parks & Resorts
PRKS
$1.39B
| $4.77K | ﹤0.01% |
+100
| New | +$3.88K |
2026 Q2
0 quarters
|
|
8203
Gaia
GAIA
$35.3M
| $4.77K | ﹤0.01% |
+2,271
| New | +$5.87K |
2026 Q2
0 quarters
|
|
8204
PUT
Nextdoor Holdings, Inc. Class A Common Stock
NXDR
$983M
| $4.77K | ﹤0.01% |
2,100
-6,800
| -76% | -$12.7K |
2025 Q3
3 quarters
|
|
8205
PUT
Pearson
PSO
$11B
| $4.77K | ﹤0.01% |
+300
| New | +$4.44K |
2026 Q2
0 quarters
|
|
8206
PUT
Centerra Gold
CGAU
$4B
| $4.76K | ﹤0.01% |
300
-200
| -40% | -$3.5K |
2021 Q4
18 quarters
|
|
8207
PUT
The Honest Company
HNST
$510M
| $4.76K | ﹤0.01% |
1,300
-600
| -32% | -$2.02K |
2021 Q2
20 quarters
|
|
8208
PUT
McGraw Hill
MH
$2.82B
| $4.74K | ﹤0.01% |
+500
| New | +$6.03K |
2026 Q2
0 quarters
|
|
8209
CALL
Prestige Consumer Healthcare
PBH
$2.34B
| $4.73K | ﹤0.01% |
+100
| New | +$5.14K |
2026 Q2
0 quarters
|
|
8210
MGIC Investment
MTG
$5.83B
| $4.71K | ﹤0.01% |
167
-15,666
| -99% | -$418K |
2025 Q4
2 quarters
|
|
8211
CALL
Flotek Industries
FTK
$839M
| $4.7K | ﹤0.01% |
200
-1,800
| -90% | -$34.8K |
2023 Q3
11 quarters
|
|
8212
VanEck Pharmaceutical ETF
PPH
$1.14B
| $4.7K | ﹤0.01% |
43
-4,930
| -99% | -$510K |
2025 Q4
2 quarters
|
|
8213
CALL
Magnera Corp
MAGN
$417M
| $4.7K | ﹤0.01% |
400
-15,400
| -97% | -$169K |
2026 Q1
1 quarter
|
|
8214
iShares MSCI BIC ETF
BKF
$65.1M
| $4.69K | ﹤0.01% |
121
+50
| +70% | +$2.06K |
2026 Q1
1 quarter
|
|
8215
PUT
Tecnoglass Holdings
TGLS
$1.7B
| $4.68K | ﹤0.01% |
100
-1,900
| -95% | -$82.1K |
2025 Q2
4 quarters
|
|
8216
CALL
Alarm.com
ALRM
$3.02B
| $4.67K | ﹤0.01% |
100
-23,700
| -100% | -$1.06M |
2016 Q2
40 quarters
|
|
8217
Ethan Allen Interiors
ETD
$517M
| $4.67K | ﹤0.01% |
209
-626
| -75% | -$13.3K |
2025 Q4
2 quarters
|
|
8218
ProShares Ultra Bloomberg Natural Gas
BOIL
$246M
| $4.66K | ﹤0.01% |
170
-8,041
| -98% | -$221K |
2025 Q1
5 quarters
|
|
8219
PUT
PROG Holdings
PRG
$1.26B
| $4.66K | ﹤0.01% |
+100
| New | +$3.49K |
2026 Q2
0 quarters
|
|
8220
CALL
Sprinklr
CXM
$1.55B
| $4.64K | ﹤0.01% |
900
-1,300
| -59% | -$6.91K |
2021 Q4
18 quarters
|
|
8221
DELISTED
Clear Channel Outdoor Holdings
CCO
| $4.64K | ﹤0.01% |
+1,917
| New | +$4.59K |
2026 Q2
0 quarters
|
|
8222
Bar Harbor Bankshares
BHB
$662M
| $4.61K | ﹤0.01% |
122
-4
| -3% | -$141 |
2025 Q2
4 quarters
|
|
8223
Ingles Markets
IMKTA
$1.67B
| $4.61K | ﹤0.01% |
+52
| New | +$4.65K |
2026 Q2
0 quarters
|
|
8224
iShares JPMorgan EM Corporate Bond ETF
CEMB
$423M
| $4.56K | ﹤0.01% |
+100
| New | +$4.56K |
2026 Q2
0 quarters
|
|
8225
CALL
American Well
AMWL
$244M
| $4.56K | ﹤0.01% |
+500
| New | +$3.73K |
2026 Q2
0 quarters
|
|
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.