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 | |
|---|---|---|---|---|---|---|
1826
Direxion Daily Small Cap Bull 3x ETF
TNA
$1.16B
| $2.43M | ﹤0.01% |
+32,406
| New | +$2.04M |
|
1827
PUT
Crane Co
CR
$12B
| $2.43M | ﹤0.01% |
+10,900
| New | +$2.05M |
|
1828
PUT
Diamondback Energy
FANG
$52.3B
| $2.43M | ﹤0.01% |
13,800
-9,000
| -39% | -$1.75M |
|
1829
PUT
Cardinal Health
CAH
$51B
| $2.42M | ﹤0.01% |
10,200
-15,400
| -60% | -$3.2M |
|
|
MPT
1830
Medical Properties Trust
MPT
$2.13B
| $2.42M | ﹤0.01% |
524,231
-22,975
| -4% | -$114K |
|
1831
CALL
NetEase
NTES
$73.9B
| $2.42M | ﹤0.01% |
18,900
+14,200
| +302% | +$1.68M |
|
1832
CALL
Power Integrations
POWI
$2.92B
| $2.42M | ﹤0.01% |
28,900
+27,900
| +2,790% | +$2.01M |
|
1833
Intuitive Surgical
ISRG
$143B
| $2.42M | ﹤0.01% |
+6,086
| New | +$2.66M |
|
1834
PUT
Sweetgreen
SG
$981M
| $2.42M | ﹤0.01% |
274,700
+35,500
| +15% | +$271K |
|
1835
PUT
Virgin Galactic
SPCE
$484M
| $2.41M | ﹤0.01% |
835,300
+395,400
| +90% | +$1.29M |
|
1836
CALL
Nasdaq
NDAQ
$52.3B
| $2.41M | ﹤0.01% |
30,600
+9,400
| +44% | +$825K |
|
1837
Walmart Inc
WMT
$857B
| $2.4M | ﹤0.01% |
+21,221
| New | +$2.63M |
|
1838
CALL
Denison Mines
DNN
$2.4B
| $2.4M | ﹤0.01% |
784,700
-427,100
| -35% | -$1.49M |
|
1839
CALL
Mondelez International
MDLZ
$76.9B
| $2.4M | ﹤0.01% |
41,500
+1,400
| +3% | +$84.3K |
|
1840
CALL
Lincoln National
LNC
$7.98B
| $2.4M | ﹤0.01% |
67,900
+21,100
| +45% | +$759K |
|
1841
CALL
VanEck Energy Income ETF
EINC
$81.6M
| $2.4M | ﹤0.01% |
100,700
+100,200
| +20,040% | +$11.8M |
|
1842
PUT
KE Holdings
BEKE
$18B
| $2.4M | ﹤0.01% |
165,000
+23,200
| +16% | +$382K |
|
1843
PUT
Tencent Music
TME
$13.7B
| $2.39M | ﹤0.01% |
286,800
+152,900
| +114% | +$1.4M |
|
1844
CALL
Revvity
RVTY
$16.9B
| $2.39M | ﹤0.01% |
21,500
+21,400
| +21,400% | +$2.06M |
|
1845
Entegris
ENTG
$23.2B
| $2.39M | ﹤0.01% |
13,273
+11,096
| +510% | +$1.6M |
|
1846
TTM Technologies
TTMI
$13.6B
| $2.38M | ﹤0.01% |
12,748
-25,567
| -67% | -$4.12M |
|
1847
PUT
C3.ai
AI
$1.71B
| $2.38M | ﹤0.01% |
262,200
+19,000
| +8% | +$180K |
|
|
UCD
1848
PUT
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $2.38M | ﹤0.01% |
42,900
-75,000
| -64% | -$4.17M |
|
1849
Crocs
CROX
$6.05B
| $2.38M | ﹤0.01% |
19,733
+3,967
| +25% | +$433K |
|
1850
CALL
VICI Properties
VICI
$25.9B
| $2.38M | ﹤0.01% |
89,600
-3,800
| -4% | -$106K |
|
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.