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 | |
|---|---|---|---|---|---|---|
1851
PUT
Photronics
PLAB
$1.79B
| $2.38M | ﹤0.01% |
73,100
+72,100
| +7,210% | +$3.05M |
|
1852
CALL
Butterfly Network
BFLY
$2.5B
| $2.38M | ﹤0.01% |
282,200
+80,800
| +40% | +$418K |
|
1853
CALL
Cogent Biosciences
COGT
$5.61B
| $2.36M | ﹤0.01% |
61,100
+14,700
| +32% | +$514K |
|
1854
CALL
Xylem
XYL
$24B
| $2.36M | ﹤0.01% |
20,000
-15,300
| -43% | -$1.77M |
|
1855
Arrowhead Research
ARWR
$9.31B
| $2.36M | ﹤0.01% |
29,002
+14,721
| +103% | +$1.09M |
|
1856
CALL
Aehr Test Systems
AEHR
$3.41B
| $2.36M | ﹤0.01% |
24,600
+2,000
| +9% | +$183K |
|
1857
PUT
Waters Corp
WAT
$42.6B
| $2.36M | ﹤0.01% |
6,300
+5,100
| +425% | +$1.74M |
|
1858
PUT
Innovative Industrial Properties
IIPR
$1.53B
| $2.36M | ﹤0.01% |
38,100
+23,400
| +159% | +$1.31M |
|
1859
CALL
Incyte
INCY
$25.1B
| $2.36M | ﹤0.01% |
20,800
+8,000
| +63% | +$793K |
|
1860
PUT
Whirlpool
WHR
$2.07B
| $2.36M | ﹤0.01% |
59,800
-9,800
| -14% | -$459K |
|
1861
Rubrik
RBRK
$22.7B
| $2.35M | ﹤0.01% |
+29,284
| New | +$1.84M |
|
|
INFQ
1862
Infleqtion Inc
INFQ
$3.27B
| $2.35M | ﹤0.01% |
+176,239
| New | +$2.42M |
|
1863
CALL
Sibanye-Stillwater
SBSW
$7.51B
| $2.35M | ﹤0.01% |
276,300
-117,700
| -30% | -$1.37M |
|
1864
Ituran Location and Control
ITRN
$1.02B
| $2.34M | ﹤0.01% |
38,435
+38,400
| +109,714% | +$2.28M |
|
|
FLY
1865
PUT
Firefly Aerospace
FLY
$4.08B
| $2.34M | ﹤0.01% |
79,500
+55,600
| +233% | +$2.08M |
|
1866
Movado Group
MOV
$761M
| $2.34M | ﹤0.01% |
+59,418
| New | +$1.85M |
|
1867
Enphase Energy
ENPH
$4.28B
| $2.34M | ﹤0.01% |
47,431
-3,102
| -6% | -$141K |
|
|
DGXX
1868
PUT
Digi Power X Inc
DGXX
$465M
| $2.34M | ﹤0.01% |
428,500
+414,100
| +2,876% | +$2.26M |
|
1869
PUT
Sprott Uranium Miners ETF
URNM
$1.86B
| $2.33M | ﹤0.01% |
47,700
+10,300
| +28% | +$637K |
|
1870
CALL
Warrior Met Coal
HCC
$4.73B
| $2.33M | ﹤0.01% |
28,700
+2,000
| +7% | +$181K |
|
1871
PUT
Kratos Defense & Security Solutions
KTOS
$8.56B
| $2.33M | ﹤0.01% |
46,700
+26,600
| +132% | +$1.61M |
|
1872
CALL
Vail Resorts
MTN
$4.85B
| $2.33M | ﹤0.01% |
17,100
+5,600
| +49% | +$729K |
|
1873
PUT
TFI International
TFII
$9.95B
| $2.33M | ﹤0.01% |
16,200
+16,100
| +16,100% | +$2.27M |
|
1874
PUT
Iron Mountain
IRM
$33.2B
| $2.32M | ﹤0.01% |
18,400
+3,400
| +23% | +$417K |
|
1875
SentinelOne
S
$7.79B
| $2.32M | ﹤0.01% |
136,771
+93,961
| +219% | +$1.45M |
|
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.