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 | |
|---|---|---|---|---|---|---|---|
6001
CALL
ANI Pharmaceuticals
ANIP
$1.65B
| $66.2K | ﹤0.01% |
800
+400
| +100% | +$32.1K |
2026 Q1
1 quarter
|
|
6002
CALL
Tiziana Life Sciences
TLSA
$121M
| $66K | ﹤0.01% |
51,600
+28,600
| +124% | +$37.2K |
2025 Q1
5 quarters
|
|
6003
Digi International
DGII
$2.97B
| $66K | ﹤0.01% |
+881
| New | +$54.6K |
2026 Q2
0 quarters
|
|
6004
CALL
loanDepot
LDI
$209M
| $66K | ﹤0.01% |
52,800
-8,300
| -14% | -$11.2K |
2023 Q1
13 quarters
|
|
6005
PUT
JOYY Inc
JOYY
$3.69B
| $66K | ﹤0.01% |
1,000
-4,500
| -82% | -$280K |
2021 Q1
21 quarters
|
|
6006
CALL
Alpha Metallurgical Resources
AMR
$2.07B
| $66K | ﹤0.01% |
400
-200
| -33% | -$38.1K |
2026 Q1
1 quarter
|
|
6007
PUT
Montana Technologies Corp
AIRJ
$217M
| $65.9K | ﹤0.01% |
11,900
+11,400
| +2,280% | +$44.2K |
2025 Q4
2 quarters
|
|
6008
CALL
Innoviva
INVA
$1.53B
| $65.9K | ﹤0.01% |
2,900
+800
| +38% | +$18.3K |
2025 Q4
2 quarters
|
|
6009
PUT
Acadia Pharmaceuticals
ACAD
$3.5B
| $65.8K | ﹤0.01% |
2,600
+2,200
| +550% | +$48.4K |
2021 Q1
21 quarters
|
|
6010
PUT
NMI Holdings
NMIH
$3.17B
| $65.7K | ﹤0.01% |
1,600
+1,200
| +300% | +$45.9K |
2025 Q1
5 quarters
|
|
6011
PUT
GSI Technology
GSIT
$173M
| $65.7K | ﹤0.01% |
8,500
-400
| -4% | -$3.18K |
2023 Q2
12 quarters
|
|
6012
PUT
Kodak
KODK
$922M
| $65.7K | ﹤0.01% |
7,100
-10,700
| -60% | -$117K |
2021 Q2
20 quarters
|
|
6013
CALL
Essential Properties Realty Trust
EPRT
$5.85B
| $65.7K | ﹤0.01% |
2,200
+200
| +10% | +$6.21K |
2024 Q2
8 quarters
|
|
6014
PUT
NovaGold Resources
NG
$2.75B
| $65.7K | ﹤0.01% |
11,000
-35,900
| -77% | -$299K |
2024 Q2
8 quarters
|
|
6015
CALL
Children's Place
PLCE
$10.5M
| $65.6K | ﹤0.01% |
21,500
+5,000
| +30% | +$17K |
2014 Q4
46 quarters
|
|
6016
iShares Core MSCI Total International Stock ETF
IXUS
$57.9B
| $65.6K | ﹤0.01% |
687
-468
| -41% | -$44K |
2025 Q4
2 quarters
|
|
6017
Vuzix
VUZI
$198M
| $65.5K | ﹤0.01% |
22,588
+5,749
| +34% | +$18.1K |
2026 Q1
1 quarter
|
|
6018
Syndax Pharmaceuticals
SNDX
$1.28B
| $65.4K | ﹤0.01% |
2,991
-17,834
| -86% | -$371K |
2025 Q4
2 quarters
|
|
6019
CALL
DELISTED
Qorvo
QRVO
| $65.3K | ﹤0.01% |
700
+300
| +75% | +$27.7K |
2021 Q2
20 quarters
|
|
6020
PUT
Lakeland Industries
LAKE
$89.2M
| $65.2K | ﹤0.01% |
6,100
+800
| +15% | +$8.07K |
2025 Q2
4 quarters
|
|
6021
Patterson-UTI
PTEN
$4.81B
| $65.2K | ﹤0.01% |
+7,099
| New | +$79.2K |
2026 Q2
0 quarters
|
|
6022
Nkarta
NKTX
$123M
| $65.1K | ﹤0.01% |
23,016
+2,530
| +12% | +$7.12K |
2024 Q2
8 quarters
|
|
6023
First Trust SMID Cap Rising Dividend Achievers ETF
SDVY
$11B
| $65K | ﹤0.01% |
1,507
+198
| +15% | +$8.26K |
2026 Q1
1 quarter
|
|
6024
Himax Technologies
HIMX
$2.09B
| $65K | ﹤0.01% |
4,238
-3,386
| -44% | -$52.6K |
2025 Q4
2 quarters
|
|
6025
CALL
Anteris Technologies
AVR
$594M
| $65K | ﹤0.01% |
6,600
+300
| +5% | +$2.28K |
2026 Q1
1 quarter
|
|
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.