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 | |
|---|---|---|---|---|---|---|
|
PPLI
7176
CALL
People Inc
PPLI
$2.9B
| $18.5K | ﹤0.01% |
400
| – | – |
|
|
SUIG
7177
CALL
Sui Group Holdings
SUIG
$75.3M
| $18.4K | ﹤0.01% |
15,900
-75,400
| -83% | -$109K |
|
7178
PUT
Amalgamated Financial
AMAL
$1.47B
| $18.4K | ﹤0.01% |
+400
| New | +$16.9K |
|
|
OGI
7179
PUT
Organigram Holdings
OGI
$166M
| $18.4K | ﹤0.01% |
18,000
+8,200
| +84% | +$10K |
|
|
PLG
7180
PUT
Platinum Group Metals
PLG
$193M
| $18.4K | ﹤0.01% |
13,600
-2,700
| -17% | -$4.52K |
|
7181
CALL
Textron
TXT
$13.6B
| $18.3K | ﹤0.01% |
200
-1,400
| -88% | -$127K |
|
7182
CALL
Certara
CERT
$1.21B
| $18.3K | ﹤0.01% |
2,800
-15,600
| -85% | -$87.9K |
|
7183
PUT
Pulmonx
LUNG
$94.9M
| $18.3K | ﹤0.01% |
14,100
+8,600
| +156% | +$11.8K |
|
7184
PUT
Ituran Location and Control
ITRN
$1.02B
| $18.3K | ﹤0.01% |
300
-300
| -50% | -$17.8K |
|
|
DMC
7185
Del Monte Corp
DMC
$1.51B
| $18.3K | ﹤0.01% |
655
-6,234
| -90% | -$219K |
|
7186
PUT
Clean Energy Fuels
CLNE
$364M
| $18.2K | ﹤0.01% |
8,900
+7,500
| +536% | +$15.9K |
|
|
INN
7187
CALL
Summit Hotel Properties
INN
$624M
| $18.2K | ﹤0.01% |
2,600
+2,500
| +2,500% | +$13.8K |
|
7188
CALL
America Movil
AMX
$68.9B
| $18.2K | ﹤0.01% |
700
+100
| +17% | +$2.63K |
|
7189
PUT
LifeMD
LFMD
$148M
| $18.2K | ﹤0.01% |
4,400
-1,700
| -28% | -$7.5K |
|
7190
PUT
Cabot Corp
CBT
$4.21B
| $18.2K | ﹤0.01% |
200
-1,000
| -83% | -$81.8K |
|
|
BANX
7191
ArrowMark Financial
BANX
$201M
| $18.1K | ﹤0.01% |
+924
| New | +$18.1K |
|
7192
PUT
Aemetis
AMTX
$132M
| $18K | ﹤0.01% |
11,000
+6,200
| +129% | +$15.2K |
|
7193
Candel Therapeutics
CADL
$978M
| $18K | ﹤0.01% |
1,749
-11,467
| -87% | -$86.6K |
|
7194
CALL
Otter Tail
OTTR
$3.77B
| $18K | ﹤0.01% |
200
-200
| -50% | -$17.7K |
|
7195
Angi Inc
ANGI
$199M
| $18K | ﹤0.01% |
+3,022
| New | +$18.6K |
|
7196
iShares MSCI China Small-Cap ETF
ECNS
$65.7M
| $18K | ﹤0.01% |
+638
| New | +$20.5K |
|
7197
CALL
Stem
STEM
$53.6M
| $18K | ﹤0.01% |
2,300
-7,200
| -76% | -$66.8K |
|
7198
PUT
Health Catalyst
HCAT
$127M
| $17.9K | ﹤0.01% |
9,000
-9,600
| -52% | -$13.9K |
|
7199
PUT
Oaktree Specialty Lending
OCSL
$1.15B
| $17.9K | ﹤0.01% |
1,500
-600
| -29% | -$7.24K |
|
7200
Castor Maritime
CTRM
$22.9M
| $17.9K | ﹤0.01% |
8,510
+2,632
| +45% | +$5.24K |
|
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.