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 | |
|---|---|---|---|---|---|---|
4801
PUT
Shattuck Labs
STTK
$656M
| $186K | ﹤0.01% |
+26,800
| New | +$167K |
|
4802
CALL
Murphy Oil
MUR
$5.15B
| $186K | ﹤0.01% |
5,700
-28,800
| -83% | -$1.1M |
|
|
AMBQ
4803
PUT
Ambiq Micro
AMBQ
$1.57B
| $185K | ﹤0.01% |
+2,100
| New | +$124K |
|
|
AADX
4804
Applied Aerospace & Defense Inc
AADX
$2.07B
| $185K | ﹤0.01% |
+8,136
| New | +$160K |
|
4805
PUT
Rayonier
RYN
$5.53B
| $185K | ﹤0.01% |
8,700
-15,200
| -64% | -$318K |
|
4806
Alto Ingredients
ALTO
$282M
| $185K | ﹤0.01% |
32,474
-15,846
| -33% | -$80.9K |
|
4807
CALL
Pembina Pipeline
PBA
$25.9B
| $185K | ﹤0.01% |
4,000
-18,800
| -82% | -$870K |
|
4808
PUT
USA Compression Partners
USAC
$3.63B
| $185K | ﹤0.01% |
7,000
+3,700
| +112% | +$102K |
|
4809
Babcock & Wilcox
BW
$865M
| $185K | ﹤0.01% |
13,092
+12,864
| +5,642% | +$218K |
|
4810
CALL
Assured Guaranty
AGO
$3.03B
| $184K | ﹤0.01% |
2,300
+2,100
| +1,050% | +$166K |
|
4811
CALL
Green Brick Partners
GRBK
$2.9B
| $184K | ﹤0.01% |
2,300
-900
| -28% | -$62.2K |
|
4812
PUT
International Seaways
INSW
$5.46B
| $184K | ﹤0.01% |
2,400
-12,400
| -84% | -$1.01M |
|
4813
CALL
EVgo
EVGO
$188M
| $184K | ﹤0.01% |
96,200
-3,200
| -3% | -$6.45K |
|
4814
American Resources Corp
AREC
$194M
| $184K | ﹤0.01% |
85,421
+23,304
| +38% | +$52.1K |
|
4815
CALL
Paymentus
PAY
$3.78B
| $184K | ﹤0.01% |
7,600
+400
| +6% | +$9.82K |
|
4816
CALL
Hafnia
HAFN
$4.83B
| $183K | ﹤0.01% |
27,600
+27,400
| +13,700% | +$222K |
|
4817
CALL
Target Hospitality
TH
$1.89B
| $183K | ﹤0.01% |
9,000
+8,900
| +8,900% | +$149K |
|
4818
CALL
Apple Hospitality REIT
APLE
$3.84B
| $183K | ﹤0.01% |
10,900
-7,000
| -39% | -$100K |
|
4819
Allegion
ALLE
$13.2B
| $183K | ﹤0.01% |
1,304
-72
| -5% | -$9.79K |
|
4820
Carlisle Companies
CSL
$12.9B
| $183K | ﹤0.01% |
+505
| New | +$177K |
|
|
HAWK
4821
HawkEye 360 Inc
HAWK
$1.51B
| $183K | ﹤0.01% |
+9,055
| New | +$250K |
|
4822
CALL
SiteOne Landscape Supply
SITE
$3.93B
| $183K | ﹤0.01% |
1,600
+700
| +78% | +$84.5K |
|
4823
CALL
Treace Medical Concepts
TMCI
$300M
| $183K | ﹤0.01% |
45,900
+45,800
| +45,800% | +$126K |
|
4824
PUT
Freedom Holding
FRHC
$10.8B
| $183K | ﹤0.01% |
1,400
+1,000
| +250% | +$146K |
|
|
SFIX
4825
CALL
Stitch Fix
SFIX
$338M
| $182K | ﹤0.01% |
44,400
+26,000
| +141% | +$94.6K |
|
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.