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 | |
|---|---|---|---|---|---|---|---|
8426
PUT
Clearwater Paper
CLW
$309M
| $3.14K | ﹤0.01% |
200
-4,100
| -95% | -$61.8K |
2023 Q1
13 quarters
|
|
8427
Perma-Pipe International
PPIH
$235M
| $3.13K | ﹤0.01% |
+115
| New | +$3.55K |
2026 Q2
0 quarters
|
|
8428
CALL
Amber International Holding Ltd
AMBR
$156M
| $3.13K | ﹤0.01% |
2,100
| – | – |
2026 Q1
1 quarter
|
|
8429
PUT
SelectQuote
SLQT
$59.1M
| $3.11K | ﹤0.01% |
3,700
+100
| +3% | +$91 |
2024 Q2
8 quarters
|
|
8430
PUT
Resideo Technologies
REZI
$2.69B
| $3.11K | ﹤0.01% |
+100
| New | +$3.44K |
2026 Q2
0 quarters
|
|
8431
Heron Therapeutics
HRTX
$57M
| $3.11K | ﹤0.01% |
7,283
-5,491
| -43% | -$4.4K |
2025 Q2
4 quarters
|
|
8432
CALL
ADC Therapeutics
ADCT
$203M
| $3.1K | ﹤0.01% |
2,900
-5,400
| -65% | -$15.8K |
2025 Q2
4 quarters
|
|
8433
PUT
NexPoint Real Estate Finance
NREF
$295M
| $3.1K | ﹤0.01% |
200
| – | – |
2026 Q1
1 quarter
|
|
8434
CALL
Zedge
ZDGE
$43M
| $3.1K | ﹤0.01% |
1,000
| – | – |
2025 Q4
2 quarters
|
|
8435
CALL
Inseego
INSG
$73.3M
| $3.1K | ﹤0.01% |
300
-500
| -63% | -$6.7K |
2024 Q1
9 quarters
|
|
8436
PUT
NervGen Pharma
NGEN
$155M
| $3.09K | ﹤0.01% |
+1,500
| New | +$4.66K |
2026 Q2
0 quarters
|
|
8437
Cheetah Mobile
CMCM
$72.9M
| $3.09K | ﹤0.01% |
+1,023
| New | +$4.87K |
2026 Q2
0 quarters
|
|
8438
CALL
Radware
RDWR
$1.25B
| $3.09K | ﹤0.01% |
+100
| New | +$2.77K |
2026 Q2
0 quarters
|
|
8439
Standard Motor Products
SMP
$840M
| $3.08K | ﹤0.01% |
79
-104
| -57% | -$3.98K |
2025 Q3
3 quarters
|
|
8440
Guidewire Software
GWRE
$15.6B
| $3.08K | ﹤0.01% |
25
-1,243
| -98% | -$166K |
2025 Q4
2 quarters
|
|
8441
Adamas Trust
ADAM
$694M
| $3.08K | ﹤0.01% |
328
-8,445
| -96% | -$72.6K |
2025 Q4
2 quarters
|
|
8442
Univest Financial
UVSP
$1.17B
| $3.06K | ﹤0.01% |
+70
| New | +$2.74K |
2026 Q2
0 quarters
|
|
8443
CALL
Arq
ARQ
$77.3M
| $3.06K | ﹤0.01% |
1,200
-100
| -8% | -$248 |
2023 Q2
12 quarters
|
|
8444
Janus International
JBI
$609M
| $3.05K | ﹤0.01% |
550
+155
| +39% | +$813 |
2026 Q1
1 quarter
|
|
8445
PUT
Heartland Express
HTLD
$800M
| $3.04K | ﹤0.01% |
200
-400
| -67% | -$5.42K |
2020 Q3
23 quarters
|
|
8446
PUT
Curbline Properties
CURB
$3.31B
| $3.04K | ﹤0.01% |
100
| – | – |
2025 Q4
2 quarters
|
|
8447
Bitwise Crypto Industry Innovators ETF
BITQ
$350M
| $3.04K | ﹤0.01% |
124
-940
| -88% | -$23.8K |
2025 Q2
4 quarters
|
|
8448
PUT
Northwest Bancshares
NWBI
$2.26B
| $3.03K | ﹤0.01% |
200
| – | – |
2025 Q2
4 quarters
|
|
8449
CALL
Shenandoah Telecom
SHEN
$567M
| $3.02K | ﹤0.01% |
200
| – | – |
2026 Q1
1 quarter
|
|
|
GPMT
8450
PUT
Granite Point Mortgage Trust
GPMT
$23.5M
| $3K | ﹤0.01% |
200
| – | – |
2025 Q4
2 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.