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 | |
|---|---|---|---|---|---|---|
3776
CALL
Howard Hughes
HHH
$4.42B
| $436K | ﹤0.01% |
6,100
-22,500
| -79% | -$1.46M |
|
3777
PUT
abrdn Physical Gold Shares ETF
SGOL
$6.88B
| $436K | ﹤0.01% |
11,400
-1,700
| -13% | -$73.1K |
|
3778
CALL
Amplitude
AMPL
$1.66B
| $435K | ﹤0.01% |
56,800
+24,500
| +76% | +$169K |
|
3779
WPP
WPP
$5.52B
| $434K | ﹤0.01% |
28,025
-10,505
| -27% | -$187K |
|
3780
CALL
Perion Network
PERI
$332M
| $434K | ﹤0.01% |
44,700
+30,400
| +213% | +$290K |
|
3781
CALL
Vertex
VERX
$1.79B
| $434K | ﹤0.01% |
37,800
-300
| -0.8% | -$3.75K |
|
3782
PUT
Mirum Pharmaceuticals
MIRM
$5.71B
| $433K | ﹤0.01% |
3,700
+3,300
| +825% | +$331K |
|
3783
PUT
ManpowerGroup
MAN
$2.65B
| $432K | ﹤0.01% |
12,800
+12,100
| +1,729% | +$370K |
|
3784
Magnolia Oil & Gas
MGY
$6.38B
| $432K | ﹤0.01% |
16,880
-96
| -0.6% | -$2.74K |
|
|
MESO
3785
PUT
Mesoblast
MESO
$1.88B
| $432K | ﹤0.01% |
31,900
+24,100
| +309% | +$358K |
|
|
GRRR
3786
Gorilla Technology Group
GRRR
$377M
| $431K | ﹤0.01% |
21,701
-2,215
| -9% | -$33.3K |
|
3787
PUT
Ternium
TX
$10.7B
| $431K | ﹤0.01% |
10,100
-18,000
| -64% | -$811K |
|
3788
CALL
Vermilion Energy
VET
$1.76B
| $431K | ﹤0.01% |
46,000
-71,500
| -61% | -$850K |
|
3789
PUT
Geron
GERN
$803M
| $431K | ﹤0.01% |
336,700
-19,900
| -6% | -$28K |
|
3790
CALL
AGCO
AGCO
$8.24B
| $431K | ﹤0.01% |
3,600
+600
| +20% | +$69.7K |
|
3791
CALL
Biohaven
BHVN
$2B
| $430K | ﹤0.01% |
28,900
-32,200
| -53% | -$347K |
|
3792
PUT
iQIYI
IQ
$994M
| $429K | ﹤0.01% |
412,900
+136,800
| +50% | +$159K |
|
3793
CALL
Outdoor Holding Co
POWW
$263M
| $429K | ﹤0.01% |
188,200
+50,000
| +36% | +$103K |
|
3794
CALL
Icahn Enterprises
IEP
$4.88B
| $429K | ﹤0.01% |
59,500
-74,200
| -55% | -$571K |
|
3795
PUT
Vital Farms
VITL
$415M
| $428K | ﹤0.01% |
36,800
+24,100
| +190% | +$269K |
|
|
INGM
3796
Ingram Micro Holding
INGM
$6.09B
| $427K | ﹤0.01% |
+15,579
| New | +$438K |
|
3797
CALL
Loar Holdings
LOAR
$5.96B
| $427K | ﹤0.01% |
5,300
-1,000
| -16% | -$63.7K |
|
3798
CALL
Douglas Emmett
DEI
$1.62B
| $427K | ﹤0.01% |
36,200
-16,200
| -31% | -$182K |
|
3799
PUT
Magna International
MGA
$17.3B
| $427K | ﹤0.01% |
6,500
+4,900
| +306% | +$306K |
|
3800
Mitsubishi UFJ Financial
MUFG
$263B
| $426K | ﹤0.01% |
+21,438
| New | +$404K |
|
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.