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 | |
|---|---|---|---|---|---|---|---|
6501
CALL
Ethan Allen Interiors
ETD
$506M
| $40.2K | ﹤0.01% |
1,800
-800
| -31% | -$17K |
2021 Q4
18 quarters
|
|
6502
Bristow Group
VTOL
$1.19B
| $40.2K | ﹤0.01% |
973
-240
| -20% | -$10.7K |
2026 Q1
1 quarter
|
|
6503
CALL
Titan International
TWI
$429M
| $40.1K | ﹤0.01% |
5,200
+400
| +8% | +$3.08K |
2020 Q2
24 quarters
|
|
6504
CALL
Forward Industries Inc
FWDI
$504M
| $40.1K | ﹤0.01% |
9,500
-95,300
| -91% | -$425K |
2025 Q4
2 quarters
|
|
6505
CALL
Hexcel
HXL
$6.04B
| $40K | ﹤0.01% |
400
-1,900
| -83% | -$172K |
2023 Q1
13 quarters
|
|
6506
CALL
BlackRock TCP Capital
TCPC
$328M
| $40K | ﹤0.01% |
11,900
+11,300
| +1,883% | +$43.9K |
2026 Q1
1 quarter
|
|
6507
Bio-Rad Laboratories Class A
BIO
$10B
| $39.9K | ﹤0.01% |
136
+13
| +11% | +$3.69K |
2026 Q1
1 quarter
|
|
6508
CALL
HomeTrust Bancshares
HTB
$749M
| $39.9K | ﹤0.01% |
+800
| New | +$37.1K |
2026 Q2
0 quarters
|
|
6509
Arcosa
ACA
| $39.8K | ﹤0.01% |
274
+261
| +2,008% | +$32.4K |
2026 Q1
1 quarter
|
|
6510
PUT
SAB Biotherapeutics
SABS
$254M
| $39.8K | ﹤0.01% |
10,200
-14,000
| -58% | -$52.1K |
2026 Q1
1 quarter
|
|
6511
CALL
RoboStrategy Inc
BOT
$586M
| $39.8K | ﹤0.01% |
+1,000
| New | +$30.9K |
2026 Q2
0 quarters
|
|
6512
CALL
Puma Biotechnology
PBYI
$560M
| $39.7K | ﹤0.01% |
4,900
-5,300
| -52% | -$38.8K |
2021 Q2
20 quarters
|
|
6513
PUT
SIGA Technologies
SIGA
$226M
| $39.7K | ﹤0.01% |
10,900
+3,300
| +43% | +$14.8K |
2022 Q2
16 quarters
|
|
6514
CALL
Journey Medical
DERM
$140M
| $39.6K | ﹤0.01% |
5,600
| – | – |
2026 Q1
1 quarter
|
|
6515
Rafael Holdings
RFL
$61.4M
| $39.6K | ﹤0.01% |
12,082
+11,945
| +8,719% | +$19.2K |
2026 Q1
1 quarter
|
|
6516
CALL
Spero Therapeutics
SPRO
$62.3M
| $39.6K | ﹤0.01% |
17,900
+17,800
| +17,800% | +$46.6K |
2025 Q2
4 quarters
|
|
6517
PUT
Willdan Group
WLDN
$1.1B
| $39.5K | ﹤0.01% |
500
+100
| +25% | +$8.52K |
2026 Q1
1 quarter
|
|
6518
CALL
Comstock
LODE
$128M
| $39.5K | ﹤0.01% |
9,500
-4,300
| -31% | -$15.6K |
2020 Q3
23 quarters
|
|
6519
CALL
Globus Medical
GMED
$11B
| $39.5K | ﹤0.01% |
500
-29,000
| -98% | -$2.46M |
2017 Q3
35 quarters
|
|
|
SILA
6520
PUT
DELISTED
Sila Realty Trust
SILA
| $39.5K | ﹤0.01% |
1,300
-500
| -28% | -$14.6K |
2024 Q3
7 quarters
|
|
6521
CALL
GSI Technology
GSIT
$152M
| $39.4K | ﹤0.01% |
5,100
-23,300
| -82% | -$185K |
2025 Q4
2 quarters
|
|
6522
PUT
Gladstone Commercial Corp
GOOD
$585M
| $39.4K | ﹤0.01% |
3,200
+1,900
| +146% | +$23.7K |
2017 Q4
34 quarters
|
|
6523
CALL
MidCap Financial Investment
MFIC
$689M
| $39.3K | ﹤0.01% |
3,900
+100
| +3% | +$1.1K |
2026 Q1
1 quarter
|
|
6524
Immix Biopharma
IMMX
$668M
| $39.3K | ﹤0.01% |
3,811
-444
| -10% | -$4.12K |
2026 Q1
1 quarter
|
|
6525
PUT
Moelis & Co
MC
$4.09B
| $39.3K | ﹤0.01% |
600
| – | – |
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.