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 | |
|---|---|---|---|---|---|---|---|
8651
CALL
Controladora Vuela Compania de Aviacion
VLRS
$654M
| $1.87K | ﹤0.01% |
200
-30,400
| -99% | -$234K |
2026 Q1
1 quarter
|
|
8652
CALL
Oatly Group
OTLY
$386M
| $1.87K | ﹤0.01% |
+200
| New | +$2.06K |
2026 Q2
0 quarters
|
|
8653
CALL
NIQ Global Intelligence PLC
NIQ
$5.86B
| $1.87K | ﹤0.01% |
200
+100
| +100% | +$967 |
2025 Q4
2 quarters
|
|
8654
Banco de Chile
BCH
$19.5B
| $1.87K | ﹤0.01% |
47
-1,636
| -97% | -$62.3K |
2025 Q4
2 quarters
|
|
8655
PUT
Lexeo Therapeutics
LXEO
$237M
| $1.86K | ﹤0.01% |
400
-100
| -20% | -$541 |
2025 Q2
4 quarters
|
|
8656
Atlantic Union Bankshares
AUB
$5.73B
| $1.86K | ﹤0.01% |
44
+9
| +26% | +$343 |
2026 Q1
1 quarter
|
|
8657
KraneShares California Carbon Allowance Strategy ETF
KCCA
$121M
| $1.85K | ﹤0.01% |
109
-2,005
| -95% | -$31.4K |
2025 Q2
4 quarters
|
|
8658
CALL
NerdWallet
NRDS
$713M
| $1.85K | ﹤0.01% |
200
-600
| -75% | -$5.62K |
2021 Q4
18 quarters
|
|
8659
PUT
MacroGenics
MGNX
$231M
| $1.85K | ﹤0.01% |
400
-700
| -64% | -$2.65K |
2025 Q1
5 quarters
|
|
8660
CALL
Lineage Cell Therapeutics
LCTX
$249M
| $1.83K | ﹤0.01% |
1,400
+700
| +100% | +$967 |
2026 Q1
1 quarter
|
|
8661
Financial Institutions
FISI
$802M
| $1.83K | ﹤0.01% |
47
-406
| -90% | -$14.4K |
2025 Q4
2 quarters
|
|
8662
PUT
Piedmont Realty Trust
PDM
$1.21B
| $1.83K | ﹤0.01% |
200
-200
| -50% | -$1.65K |
2025 Q4
2 quarters
|
|
8663
CALL
DELISTED
Simulations Plus
SLP
| $1.83K | ﹤0.01% |
+100
| New | +$1.54K |
2026 Q2
0 quarters
|
|
8664
Invesco S&P 500 Equal Weight Health Care ETF
RSPH
$941M
| $1.82K | ﹤0.01% |
+55
| New | +$1.71K |
2026 Q2
0 quarters
|
|
8665
Roundhill MSFT WeeklyPay ETF
MSFW
$33.5M
| $1.82K | ﹤0.01% |
+74
| New | +$2.09K |
2026 Q2
0 quarters
|
|
8666
CALL
Pulmonx
LUNG
$80.7M
| $1.82K | ﹤0.01% |
+1,400
| New | +$1.93K |
2026 Q2
0 quarters
|
|
8667
CALL
SIGA Technologies
SIGA
$226M
| $1.82K | ﹤0.01% |
+500
| New | +$2.24K |
2026 Q2
0 quarters
|
|
8668
Invesco Agriculture Commodity Strategy No K-1 ETF
PDBA
$475M
| $1.82K | ﹤0.01% |
+51
| New | +$1.85K |
2026 Q2
0 quarters
|
|
8669
CALL
Grupo Aeromexico SAB de CV
AERO
$2.22B
| $1.8K | ﹤0.01% |
+100
| New | +$1.6K |
2026 Q2
0 quarters
|
|
8670
PUT
Betterware México
BWMX
$595M
| $1.8K | ﹤0.01% |
+100
| New | +$1.75K |
2026 Q2
0 quarters
|
|
8671
CALL
Heron Therapeutics
HRTX
$56.2M
| $1.79K | ﹤0.01% |
4,200
+2,800
| +200% | +$2.24K |
2023 Q3
11 quarters
|
|
8672
Amalgamated Financial
AMAL
$1.5B
| $1.79K | ﹤0.01% |
+39
| New | +$1.64K |
2026 Q2
0 quarters
|
|
8673
PUT
Docebo
DCBO
$761M
| $1.79K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8674
PUT
Global Net Lease
GNL
$1.68B
| $1.79K | ﹤0.01% |
200
-17,200
| -99% | -$161K |
2018 Q3
31 quarters
|
|
8675
CALL
Zumiez
ZUMZ
$220M
| $1.78K | ﹤0.01% |
100
-100
| -50% | -$2.24K |
2025 Q4
2 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.