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 | |
|---|---|---|---|---|---|---|
2976
Strive Inc
ASST
$2.83B
| $842K | ﹤0.01% |
77,191
+13,216
| +21% | +$196K |
|
2977
Churchill Downs
CHDN
$5.42B
| $841K | ﹤0.01% |
9,385
+9,333
| +17,948% | +$837K |
|
2978
IDEX
IEX
$17B
| $838K | ﹤0.01% |
+3,694
| New | +$782K |
|
2979
PUT
Array Technologies
ARRY
$593M
| $838K | ﹤0.01% |
113,100
+41,900
| +59% | +$334K |
|
2980
CALL
Booz Allen Hamilton
BAH
$8.57B
| $837K | ﹤0.01% |
13,800
+4,600
| +50% | +$351K |
|
2981
CALL
Leidos
LDOS
$15.3B
| $834K | ﹤0.01% |
8,100
+4,800
| +145% | +$637K |
|
2982
PUT
Northern Oil and Gas
NOG
$2.49B
| $833K | ﹤0.01% |
45,900
+38,700
| +538% | +$917K |
|
2983
CALL
Red Rock Resorts
RRR
$2.98B
| $833K | ﹤0.01% |
12,800
+12,500
| +4,167% | +$711K |
|
2984
Twist Bioscience
TWST
$12B
| $831K | ﹤0.01% |
8,078
+7,605
| +1,608% | +$495K |
|
2985
CALL
Motorola Solutions
MSI
$75.4B
| $831K | ﹤0.01% |
2,000
-15,800
| -89% | -$6.61M |
|
2986
CALL
Comstock Resources
CRK
$3.8B
| $830K | ﹤0.01% |
55,600
-124,600
| -69% | -$1.9M |
|
2987
CALL
Ryanair
RYAAY
$28.4B
| $829K | ﹤0.01% |
12,800
+10,900
| +574% | +$643K |
|
2988
Vail Resorts
MTN
$4.88B
| $828K | ﹤0.01% |
6,080
+2,305
| +61% | +$300K |
|
2989
Compass
COMP
$6.95B
| $827K | ﹤0.01% |
67,074
-33,753
| -33% | -$281K |
|
2990
Agnico Eagle Mines
AEM
$94B
| $826K | ﹤0.01% |
5,325
-10,003
| -65% | -$1.85M |
|
2991
CALL
Fortis
FTS
$26.9B
| $824K | ﹤0.01% |
14,400
+14,200
| +7,100% | +$801K |
|
2992
PUT
Rambus
RMBS
$10.9B
| $823K | ﹤0.01% |
6,200
+4,300
| +226% | +$559K |
|
2993
Coca-Cola Consolidated
COKE
$12.6B
| $821K | ﹤0.01% |
4,302
+3,620
| +531% | +$674K |
|
2994
Sherwin-Williams
SHW
$79.7B
| $821K | ﹤0.01% |
+2,385
| New | +$762K |
|
2995
PUT
WIX.com
WIX
$3B
| $821K | ﹤0.01% |
18,100
-4,100
| -18% | -$253K |
|
2996
Equinox Gold
EQX
$13.2B
| $821K | ﹤0.01% |
84,419
+4,489
| +6% | +$57.9K |
|
|
HTGCR
2997
PUT
DELISTED
HERCULES TECHNOLOGY GROWTH CAP INC TRANS RGTS TO PUR COM STK
HTGCR
| $820K | ﹤0.01% |
52,000
-37,200
| -42% | -$587K |
|
2998
CALL
EXL Service
EXLS
$5.21B
| $820K | ﹤0.01% |
31,700
+1,500
| +5% | +$44.2K |
|
2999
CALL
Krystal Biotech
KRYS
$10B
| $818K | ﹤0.01% |
2,200
+1,600
| +267% | +$478K |
|
3000
Celsius Holdings
CELH
$7.1B
| $817K | ﹤0.01% |
+27,916
| New | +$880K |
|
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.