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 | |
|---|---|---|---|---|---|---|
101
CALL
JPMorgan Chase
JPM
$912B
| $156M | 0.09% |
475,300
+98,200
| +26% | +$30.5M |
|
102
CALL
Walmart Inc
WMT
$857B
| $149M | 0.09% |
1,317,400
-8,200
| -0.6% | -$1.02M |
|
103
CALL
Palo Alto Networks
PANW
$307B
| $148M | 0.09% |
433,400
-53,700
| -11% | -$12.3M |
|
|
NBIS
104
CALL
Nebius Group N.V.
NBIS
$64.5B
| $147M | 0.09% |
533,500
+7,400
| +1% | +$1.47M |
|
105
PUT
GE Vernova
GEV
$255B
| $146M | 0.09% |
124,400
+11,500
| +10% | +$11.7M |
|
106
PUT
Bank of America
BAC
$396B
| $137M | 0.08% |
2,403,500
+93,200
| +4% | +$4.96M |
|
107
CALL
ASML
ASML
$670B
| $136M | 0.08% |
68,600
-42,600
| -38% | -$67.8M |
|
108
CALL
Berkshire Hathaway Class B
BRK.B
$1.08T
| $136M | 0.08% |
271,200
-105,800
| -28% | -$50.9M |
|
|
KNGS
109
PUT
DELISTED
Roundhill S&P Dividend Monarchs ETF
KNGS
| $135M | 0.08% |
1,847,100
+1,824,400
| +8,037% | +$134M |
|
110
PUT
CrowdStrike
CRWD
$258B
| $135M | 0.08% |
709,600
-140,400
| -17% | -$19.9M |
|
111
CALL
Dell
DELL
$358B
| $134M | 0.08% |
311,200
-16,500
| -5% | -$4.77M |
|
112
PUT
Lam Research
LRCX
$394B
| $133M | 0.08% |
307,300
-7,500
| -2% | -$2.28M |
|
113
CALL
Bloom Energy
BE
$85B
| $132M | 0.08% |
436,100
-62,300
| -13% | -$16M |
|
114
Alphabet (Google) Class A
GOOGL
$4.21T
| $132M | 0.08% |
368,241
+71,926
| +24% | +$25.9M |
|
115
CALL
Western Digital
WDC
$165B
| $130M | 0.08% |
201,600
-53,600
| -21% | -$26.1M |
|
116
PUT
Corning
GLW
$135B
| $130M | 0.08% |
507,800
+217,500
| +75% | +$39.6M |
|
117
CALL
IBM
IBM
$212B
| $128M | 0.08% |
456,800
+223,600
| +96% | +$56.3M |
|
|
118
PUT
Palo Alto Networks
PANW
$307B
| $126M | 0.07% |
368,700
+32,900
| +10% | +$7.53M |
|
|
KNGS
119
CALL
DELISTED
Roundhill S&P Dividend Monarchs ETF
KNGS
| $126M | 0.07% |
1,717,500
+1,677,300
| +4,172% | +$123M |
|
120
PUT
Iris Energy
IREN
$17.4B
| $121M | 0.07% |
2,638,000
+912,300
| +53% | +$47.4M |
|
121
CALL
Strategy Inc
MSTR
$63B
| $121M | 0.07% |
1,390,600
-45,000
| -3% | -$6.53M |
|
|
NVO
122
CALL
Novo Nordisk
NVO
$171B
| $120M | 0.07% |
2,500,400
+110,500
| +5% | +$4.75M |
|
123
CALL
Caterpillar
CAT
$378B
| $118M | 0.07% |
111,200
-2,800
| -2% | -$2.46M |
|
|
CRWV
124
PUT
CoreWeave
CRWV
$48.3B
| $118M | 0.07% |
1,184,900
-1,077,100
| -48% | -$116M |
|
125
CALL
Boeing
BA
$157B
| $117M | 0.07% |
539,200
-147,100
| -21% | -$32.7M |
|
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.