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 | |
|---|---|---|---|---|---|---|
1726
PUT
Brookfield Asset Management
BAM
$71.2B
| $2.71M | ﹤0.01% |
60,500
-84,900
| -58% | -$4.01M |
|
1727
PUT
Viavi Solutions
VIAV
$10B
| $2.71M | ﹤0.01% |
56,800
+700
| +1% | +$33.5K |
|
1728
3M
MMM
$87.4B
| $2.71M | ﹤0.01% |
16,742
+5,032
| +43% | +$763K |
|
1729
CALL
Honeywell
HON
$67.4B
| $2.71M | ﹤0.01% |
212,800
+61,000
| +40% | +$13.6M |
|
1730
PUT
Harley-Davidson
HOG
$2.65B
| $2.7M | ﹤0.01% |
110,400
-59,200
| -35% | -$1.42M |
|
1731
CALL
Franco-Nevada
FNV
$49.7B
| $2.69M | ﹤0.01% |
12,900
+1,100
| +9% | +$256K |
|
1732
CALL
NiSource
NI
$18.9B
| $2.69M | ﹤0.01% |
56,500
+54,600
| +2,874% | +$2.58M |
|
1733
PUT
Novavax
NVAX
$1.75B
| $2.69M | ﹤0.01% |
285,100
+10,100
| +4% | +$90.5K |
|
1734
PUT
YieldMax TSLA Option Income Strategy ETF
TSLY
$692M
| $2.68M | ﹤0.01% |
132,100
-350,300
| -73% | -$10.3M |
|
1735
SGHC Ltd
SGHC
$6.08B
| $2.68M | ﹤0.01% |
+198,070
| New | +$2.51M |
|
1736
iShares US Medical Devices ETF
IHI
$3.52B
| $2.68M | ﹤0.01% |
+54,190
| New | +$2.75M |
|
1737
CALL
Canadian Pacific Kansas City
CP
$76.4B
| $2.68M | ﹤0.01% |
30,900
+16,500
| +115% | +$1.41M |
|
1738
PUT
Ecolab
ECL
$78.3B
| $2.67M | ﹤0.01% |
9,600
+9,200
| +2,300% | +$2.42M |
|
1739
PUT
ProShares UltraShort Industrials
SIJ
$6.53M
| $2.67M | ﹤0.01% |
59,500
+47,500
| +396% | +$848K |
|
1740
Monster Beverage
MNST
$84.5B
| $2.65M | ﹤0.01% |
+55,136
| New | +$2.32M |
|
1741
CALL
Lightwave Logic
LWLG
$819M
| $2.65M | ﹤0.01% |
279,800
+94,100
| +51% | +$1.1M |
|
1742
Atlassian
TEAM
$47.5B
| $2.65M | ﹤0.01% |
+34,025
| New | +$2.78M |
|
1743
CALL
StoneCo
STNE
$2.14B
| $2.65M | ﹤0.01% |
244,100
-230,100
| -49% | -$2.73M |
|
1744
CALL
ALPS REIT Dividend Dogs ETF
RDOG
$10.5M
| $2.64M | ﹤0.01% |
51,400
+2,600
| +5% | +$103K |
|
1745
AZZ Inc
AZZ
$4.12B
| $2.64M | ﹤0.01% |
17,017
+8,629
| +103% | +$1.23M |
|
1746
MKS Inc
MKSI
$17.6B
| $2.64M | ﹤0.01% |
+5,931
| New | +$1.86M |
|
1747
CALL
Monolithic Power Systems
MPWR
$67.2B
| $2.63M | ﹤0.01% |
1,900
-1,000
| -34% | -$1.5M |
|
1748
PUT
Star Bulk Carriers
SBLK
$3.43B
| $2.62M | ﹤0.01% |
105,100
+31,100
| +42% | +$804K |
|
1749
CALL
Modine Manufacturing
MOD
$10.5B
| $2.62M | ﹤0.01% |
9,800
+7,300
| +292% | +$1.92M |
|
1750
Globalstar
GSAT
$10.7B
| $2.61M | ﹤0.01% |
32,151
-15,662
| -33% | -$1.26M |
|
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.