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 | Held Since | |
|---|---|---|---|---|---|---|---|
8301
KRONOS Worldwide
KRO
$863M
| $3.92K | ﹤0.01% |
619
-11,354
| -95% | -$77.8K |
2025 Q3
3 quarters
|
|
8302
iShares MSCI Intl Quality Factor ETF
IQLT
$13.7B
| $3.91K | ﹤0.01% |
79
-48
| -38% | -$2.35K |
2025 Q4
2 quarters
|
|
8303
Invesco MSCI Global Timber ETF
CUT
$28.9M
| $3.91K | ﹤0.01% |
140
+119
| +567% | +$3.32K |
2026 Q1
1 quarter
|
|
8304
CALL
Liquidity Services
LQDT
$1.38B
| $3.91K | ﹤0.01% |
100
-200
| -67% | -$7.08K |
2025 Q3
3 quarters
|
|
8305
PUT
Zegna
ZGN
$3.72B
| $3.91K | ﹤0.01% |
+300
| New | +$3.87K |
2026 Q2
0 quarters
|
|
8306
Rani Therapeutics
RANI
$68.4M
| $3.9K | ﹤0.01% |
5,136
-4,965
| -49% | -$4.4K |
2026 Q1
1 quarter
|
|
8307
CALL
FreightCar America
RAIL
$137M
| $3.9K | ﹤0.01% |
400
-800
| -67% | -$6.74K |
2025 Q4
2 quarters
|
|
8308
PUT
CeriBell Inc
CBLL
$1.03B
| $3.89K | ﹤0.01% |
+200
| New | +$3.8K |
2026 Q2
0 quarters
|
|
|
SVC
8309
CALL
Service Properties Trust
SVC
$806M
| $3.89K | ﹤0.01% |
460
+300
| +188% | +$2.36K |
2025 Q1
5 quarters
|
|
8310
PUT
eHealth
EHTH
$18M
| $3.87K | ﹤0.01% |
+2,600
| New | +$4.36K |
2026 Q2
0 quarters
|
|
8311
Amplify Online Retail ETF
IBUY
$129M
| $3.87K | ﹤0.01% |
+56
| New | +$3.74K |
2026 Q2
0 quarters
|
|
8312
PUT
CarParts.com
PRTS
$60.3M
| $3.86K | ﹤0.01% |
+600
| New | +$4.45K |
2026 Q2
0 quarters
|
|
8313
Solana Company
HSDT
$147M
| $3.86K | ﹤0.01% |
2,341
-203
| -8% | -$388 |
2026 Q1
1 quarter
|
|
8314
CALL
iHeartMedia
IHRT
$255M
| $3.86K | ﹤0.01% |
900
-7,100
| -89% | -$31.5K |
2025 Q3
3 quarters
|
|
8315
PUT
VanEck Merk Gold Trust
OUNZ
$2.6B
| $3.86K | ﹤0.01% |
100
-100
| -50% | -$4.34K |
2025 Q4
2 quarters
|
|
|
WMCR
8316
CALL
DELISTED
Invesco Wilshire Micro-Cap ETF
WMCR
| $3.86K | ﹤0.01% |
100
-300
| -75% | -$11.6K |
2026 Q1
1 quarter
|
|
8317
American Coastal Insurance
ACIC
$541M
| $3.84K | ﹤0.01% |
+346
| New | +$3.82K |
2026 Q2
0 quarters
|
|
8318
NovaBridge Biosciences American Depositary Shares
NBP
$149M
| $3.84K | ﹤0.01% |
+1,967
| New | +$4.01K |
2026 Q2
0 quarters
|
|
8319
CALL
Essential Utilities
WTRG
$12B
| $3.83K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8320
YieldMax META Option Income Strategy ETF
FBY
$104M
| $3.82K | ﹤0.01% |
426
-7,462
| -95% | -$75.3K |
2024 Q3
7 quarters
|
|
8321
Civeo
CVEO
$289M
| $3.82K | ﹤0.01% |
+109
| New | +$3.51K |
2026 Q2
0 quarters
|
|
8322
Leverage Shares 2X Long TER Daily ETF
TERG
$4.73M
| $3.81K | ﹤0.01% |
+48
| New | +$2.63K |
2026 Q2
0 quarters
|
|
8323
Fidelity MSCI Utilities Index ETF
FUTY
$2.09B
| $3.8K | ﹤0.01% |
+65
| New | +$3.8K |
2026 Q2
0 quarters
|
|
8324
CALL
PRA Group
PRAA
$768M
| $3.8K | ﹤0.01% |
+200
| New | +$3.55K |
2026 Q2
0 quarters
|
|
|
8325
PUT
PRA Group
PRAA
$768M
| $3.8K | ﹤0.01% |
+200
| New | +$3.55K |
2026 Q2
0 quarters
|
|
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.