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 | |
|---|---|---|---|---|---|---|
2876
CALL
Harmony Gold Mining
HMY
$11.3B
| $923K | ﹤0.01% |
60,700
-16,100
| -21% | -$267K |
|
2877
Madison Square Garden
MSGE
$3.81B
| $923K | ﹤0.01% |
11,411
+9,712
| +572% | +$662K |
|
2878
CALL
Crexendo
CXDO
$197M
| $923K | ﹤0.01% |
123,500
+118,500
| +2,370% | +$926K |
|
|
DLLL
2879
GraniteShares 2x Long DELL Daily ETF
DLLL
$218M
| $922K | ﹤0.01% |
36,941
+12,829
| +53% | +$171K |
|
|
BKV
2880
BKV Corp
BKV
$2.37B
| $922K | ﹤0.01% |
+33,691
| New | +$927K |
|
2881
PUT
Ryan Specialty Holdings
RYAN
$4.61B
| $921K | ﹤0.01% |
24,400
-17,700
| -42% | -$601K |
|
2882
CALL
HDFC Bank
HDB
$116B
| $920K | ﹤0.01% |
35,600
-6,100
| -15% | -$153K |
|
2883
Elastic
ESTC
$9.04B
| $919K | ﹤0.01% |
16,116
+1,598
| +11% | +$85.7K |
|
2884
LyondellBasell Industries
LYB
$19B
| $919K | ﹤0.01% |
17,453
-20,980
| -55% | -$1.45M |
|
2885
PUT
Unusual Machines
UMAC
$1.19B
| $919K | ﹤0.01% |
41,200
+31,700
| +334% | +$587K |
|
2886
CALL
Consolidated Edison
ED
$38.2B
| $918K | ﹤0.01% |
8,300
+1,500
| +22% | +$163K |
|
2887
LGI Homes
LGIH
$1.16B
| $918K | ﹤0.01% |
14,412
+9,313
| +183% | +$445K |
|
2888
PUT
WEX
WEX
$6.11B
| $917K | ﹤0.01% |
+6,500
| New | +$963K |
|
2889
CALL
ODDITY Tech
ODD
$820M
| $917K | ﹤0.01% |
60,600
-2,800
| -4% | -$37.5K |
|
2890
Hallador Energy
HNRG
$686M
| $912K | ﹤0.01% |
52,458
-70
| -0.1% | -$1.2K |
|
|
AMRZ
2891
CALL
Amrize Ltd
AMRZ
$20.8B
| $911K | ﹤0.01% |
17,100
+6,000
| +54% | +$325K |
|
2892
iShares US Aerospace & Defense ETF
ITA
$12.4B
| $911K | ﹤0.01% |
+3,757
| New | +$856K |
|
2893
Entravision Communication
EVC
$673M
| $910K | ﹤0.01% |
69,812
+49,810
| +249% | +$353K |
|
2894
CALL
Lantheus
LNTH
$6.52B
| $910K | ﹤0.01% |
8,200
+2,900
| +55% | +$270K |
|
2895
PUT
Energizer
ENR
$1.5B
| $909K | ﹤0.01% |
42,400
+28,600
| +207% | +$545K |
|
2896
PUT
Ero Copper
ERO
$3.87B
| $907K | ﹤0.01% |
33,900
-65,200
| -66% | -$1.85M |
|
2897
Apollo Global Management
APO
$71.2B
| $905K | ﹤0.01% |
+7,648
| New | +$962K |
|
2898
CALL
Praxis Precision Medicines
PRAX
$7.87B
| $904K | ﹤0.01% |
2,700
-3,200
| -54% | -$1.01M |
|
2899
Rambus
RMBS
$11B
| $903K | ﹤0.01% |
+6,803
| New | +$885K |
|
2900
Qualys
QLYS
$5.91B
| $902K | ﹤0.01% |
6,563
+6,467
| +6,736% | +$636K |
|
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.