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 | |
|---|---|---|---|---|---|---|
76
PUT
Bloom Energy
BE
$85B
| $206M | 0.12% |
681,600
-10,800
| -2% | -$2.77M |
|
77
CALL
Applied Materials
AMAT
$385B
| $206M | 0.12% |
284,300
+25,200
| +10% | +$11.6M |
|
|
KFYP
78
CALL
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
| $203M | 0.12% |
8,252,700
-1,450,400
| -15% | -$35.6M |
|
79
PUT
Alibaba
BABA
$273B
| $203M | 0.12% |
2,112,400
-544,800
| -21% | -$68.2M |
|
80
CALL
United States Oil Fund
USO
$1.96B
| $199M | 0.12% |
1,874,200
-147,100
| -7% | -$19.3M |
|
81
CALL
Carvana
CVNA
$46.8B
| $197M | 0.12% |
2,987,900
+426,900
| +17% | +$30.2M |
|
82
PUT
Dell
DELL
$358B
| $191M | 0.11% |
443,700
-105,200
| -19% | -$30.4M |
|
83
PUT
iShares Morningstar Value ETF
ILCV
$1.34B
| $191M | 0.11% |
2,334,600
-3,989,000
| -63% | -$396M |
|
84
CALL
Lam Research
LRCX
$394B
| $190M | 0.11% |
438,800
+18,800
| +4% | +$5.71M |
|
|
UWC
85
CALL
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $188M | 0.11% |
2,236,500
-225,600
| -9% | -$19M |
|
86
PUT
Lumentum
LITE
$84.5B
| $188M | 0.11% |
219,200
+78,200
| +55% | +$69.8M |
|
87
CALL
Citigroup
C
$225B
| $186M | 0.11% |
1,329,300
-270,000
| -17% | -$35.1M |
|
|
88
PUT
Citigroup
C
$225B
| $182M | 0.11% |
1,297,900
-403,600
| -24% | -$52.5M |
|
89
PUT
Seagate
STX
$208B
| $181M | 0.11% |
187,500
+47,900
| +34% | +$36.5M |
|
90
CALL
Arm
ARM
$331B
| $177M | 0.1% |
499,800
-70,600
| -12% | -$18.8M |
|
|
UWC
91
PUT
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $174M | 0.1% |
2,098,800
+408,100
| +24% | +$33.7M |
|
92
PUT
Coinbase
COIN
$51.5B
| $171M | 0.1% |
1,170,900
+174,400
| +18% | +$31.5M |
|
93
CALL
Cisco
CSCO
$421B
| $164M | 0.1% |
1,394,400
-49,900
| -3% | -$5.22M |
|
94
CALL
Direxion Daily Technology Bull 3x ETF
TECL
$6.68B
| $163M | 0.1% |
734,100
-897,600
| -55% | -$162M |
|
95
PUT
Caterpillar
CAT
$378B
| $163M | 0.1% |
152,900
+47,500
| +45% | +$41.7M |
|
|
96
iShares Russell 2000 ETF
IWM
$77.3B
| $161M | 0.09% |
536,810
+520,581
| +3,208% | +$146M |
|
|
97
iShares 20+ Year Treasury Bond ETF
TLT
$46.3B
| $161M | 0.09% |
1,860,997
+1,252,985
| +206% | +$108M |
|
98
PUT
Western Digital
WDC
$165B
| $160M | 0.09% |
257,100
-14,900
| -5% | -$7.24M |
|
99
CALL
ExxonMobil
XOM
$660B
| $159M | 0.09% |
1,160,300
-427,200
| -27% | -$63.9M |
|
100
PUT
Robinhood
HOOD
$107B
| $158M | 0.09% |
1,579,700
-6,600
| -0.4% | -$553K |
|
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.