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 | |
|---|---|---|---|---|---|---|
1301
CALL
Brookfield Asset Management
BAM
$71.2B
| $4.36M | ﹤0.01% |
97,300
+21,400
| +28% | +$1.01M |
|
1302
Charles River Laboratories
CRL
$14B
| $4.35M | ﹤0.01% |
+19,196
| New | +$3.42M |
|
1303
CALL
Mirion Technologies
MIR
$3.79B
| $4.35M | ﹤0.01% |
242,600
+119,600
| +97% | +$2.22M |
|
1304
Plains All American Pipeline
PAA
$17.2B
| $4.34M | ﹤0.01% |
+194,799
| New | +$4.33M |
|
1305
PUT
Nektar Therapeutics
NKTR
$1.95B
| $4.34M | ﹤0.01% |
62,100
+57,800
| +1,344% | +$4.23M |
|
|
LAC
1306
CALL
Lithium Americas
LAC
$998M
| $4.33M | ﹤0.01% |
1,123,500
-122,900
| -10% | -$585K |
|
1307
CALL
Invesco DB Commodity Index Tracking Fund
DBC
$1.93B
| $4.32M | ﹤0.01% |
162,000
+70,400
| +77% | +$2.07M |
|
1308
CALL
FMC
FMC
$1.49B
| $4.32M | ﹤0.01% |
375,500
+141,700
| +61% | +$1.98M |
|
1309
PUT
Infosys
INFY
$42.5B
| $4.32M | ﹤0.01% |
411,600
+18,400
| +5% | +$230K |
|
1310
PUT
CME Group
CME
$95.1B
| $4.31M | ﹤0.01% |
19,500
-32,000
| -62% | -$8.85M |
|
1311
PUT
Autodesk
ADSK
$43.8B
| $4.3M | ﹤0.01% |
22,100
+11,800
| +115% | +$2.69M |
|
1312
CALL
Dynatrace
DT
$16.7B
| $4.28M | ﹤0.01% |
97,500
+56,700
| +139% | +$2.21M |
|
1313
CALL
Uranium Energy
UEC
$4.66B
| $4.28M | ﹤0.01% |
401,100
+132,700
| +49% | +$1.78M |
|
1314
PUT
RH
RH
$2.35B
| $4.27M | ﹤0.01% |
25,900
-33,600
| -56% | -$4.63M |
|
1315
CALL
FIVE9
FIVN
$2.67B
| $4.24M | ﹤0.01% |
199,100
+41,600
| +26% | +$821K |
|
|
UNIT
1316
PUT
Uniti Group
UNIT
$2.16B
| $4.24M | ﹤0.01% |
369,500
+31,900
| +9% | +$362K |
|
1317
PUT
Southern Copper
SCCO
$172B
| $4.23M | ﹤0.01% |
24,592
-17,008
| -41% | -$3.06M |
|
1318
PUT
CSX Corp
CSX
$86.7B
| $4.23M | ﹤0.01% |
89,000
-133,100
| -60% | -$6.01M |
|
1319
Amkor Technology
AMKR
$13.3B
| $4.23M | ﹤0.01% |
+49,051
| New | +$3.5M |
|
1320
CALL
Calumet Specialty Products
CLMT
$4.72B
| $4.22M | ﹤0.01% |
117,200
-113,500
| -49% | -$3.82M |
|
1321
PUT
Campbell Soup
CPB
$5.78B
| $4.22M | ﹤0.01% |
189,400
-52,900
| -22% | -$1.12M |
|
1322
PUT
Intuitive Machines
LUNR
$2.5B
| $4.21M | ﹤0.01% |
196,900
+13,200
| +7% | +$371K |
|
1323
CALL
BILL Holdings
BILL
$3.77B
| $4.21M | ﹤0.01% |
116,400
+67,700
| +139% | +$2.49M |
|
1324
CALL
Bank of Montreal
BMO
$120B
| $4.21M | ﹤0.01% |
23,800
+11,200
| +89% | +$1.76M |
|
1325
CALL
Bio-Techne
TECH
$11.4B
| $4.2M | ﹤0.01% |
59,500
+57,700
| +3,206% | +$3.12M |
|
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.