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 | |
|---|---|---|---|---|---|---|---|
7776
CALL
Xunlei
XNET
$249M
| $8.95K | ﹤0.01% |
1,600
+800
| +100% | +$4.61K |
2021 Q2
20 quarters
|
|
7777
PUT
Ethan Allen Interiors
ETD
$515M
| $8.94K | ﹤0.01% |
400
-2,300
| -85% | -$48.8K |
2021 Q4
18 quarters
|
|
7778
PUT
Conduent
CNDT
$233M
| $8.91K | ﹤0.01% |
6,100
-100
| -2% | -$155 |
2025 Q4
2 quarters
|
|
7779
Playboy Inc
PLBY
$128M
| $8.89K | ﹤0.01% |
7,286
-21,371
| -75% | -$32.4K |
2024 Q2
8 quarters
|
|
7780
CALL
Companhia Siderúrgica Nacional
SID
$1.38B
| $8.88K | ﹤0.01% |
9,700
+8,300
| +593% | +$10.4K |
2026 Q1
1 quarter
|
|
7781
PUT
Veralto
VLTO
$25.4B
| $8.87K | ﹤0.01% |
100
-500
| -83% | -$43.4K |
2024 Q2
8 quarters
|
|
7782
CALL
Jiayin Group
JFIN
$68.6M
| $8.87K | ﹤0.01% |
3,100
-22,000
| -88% | -$93.5K |
2023 Q2
12 quarters
|
|
7783
State Street SPDR S&P Oil & Gas Equipment & Services ETF
XES
$335M
| $8.85K | ﹤0.01% |
+79
| New | +$9.6K |
2026 Q2
0 quarters
|
|
7784
Chemed
CHE
$6.73B
| $8.85K | ﹤0.01% |
19
-32
| -63% | -$13.5K |
2026 Q1
1 quarter
|
|
7785
Genesco
GCO
$391M
| $8.85K | ﹤0.01% |
262
-2,590
| -91% | -$90.9K |
2025 Q4
2 quarters
|
|
7786
Largo
LGO
$47.1M
| $8.79K | ﹤0.01% |
+13,865
| New | +$14.3K |
2026 Q2
0 quarters
|
|
7787
PUT
Patria Investments
PAX
$1.92B
| $8.78K | ﹤0.01% |
800
+200
| +33% | +$2.38K |
2021 Q1
21 quarters
|
|
7788
ADC Therapeutics
ADCT
$197M
| $8.77K | ﹤0.01% |
+8,197
| New | +$23.9K |
2026 Q2
0 quarters
|
|
7789
CALL
BCP Investment Corp
BCIC
$74.9M
| $8.74K | ﹤0.01% |
+1,200
| New | +$9.19K |
2026 Q2
0 quarters
|
|
7790
CALL
Fortrea Holdings
FTRE
$2.26B
| $8.7K | ﹤0.01% |
500
-6,100
| -92% | -$82.4K |
2023 Q3
11 quarters
|
|
7791
PUT
NET Power
NPWR
$81.3M
| $8.68K | ﹤0.01% |
5,200
-6,900
| -57% | -$12.5K |
2024 Q1
9 quarters
|
|
7792
PUT
Design Therapeutics
DSGN
$642M
| $8.68K | ﹤0.01% |
+600
| New | +$7.48K |
2026 Q2
0 quarters
|
|
7793
CALL
NCR Atleos
NATL
$3.48B
| $8.68K | ﹤0.01% |
200
| – | – |
2023 Q4
10 quarters
|
|
7794
PUT
International Money Express
IMXI
$280M
| $8.67K | ﹤0.01% |
600
| – | – |
2026 Q1
1 quarter
|
|
7795
PUT
Amneal Pharmaceuticals
AMRX
$7.02B
| $8.65K | ﹤0.01% |
500
-1,900
| -79% | -$26K |
2026 Q1
1 quarter
|
|
7796
Dynagas LNG Partners
DLNG
$122M
| $8.65K | ﹤0.01% |
2,560
-3,150
| -55% | -$12.1K |
2026 Q1
1 quarter
|
|
7797
PUT
Quanterix
QTRX
$131M
| $8.64K | ﹤0.01% |
2,000
+1,000
| +100% | +$3.24K |
2025 Q2
4 quarters
|
|
7798
Expensify
EXFY
$230M
| $8.63K | ﹤0.01% |
4,823
-17,310
| -78% | -$19.4K |
2025 Q4
2 quarters
|
|
7799
Vox Royalty Corp
VOXR
$336M
| $8.62K | ﹤0.01% |
1,823
+1,281
| +236% | +$7.05K |
2026 Q1
1 quarter
|
|
7800
CALL
John B. Sanfilippo & Son
JBSS
$795M
| $8.6K | ﹤0.01% |
100
| – | – |
2025 Q1
5 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.