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 | |
|---|---|---|---|---|---|---|
6951
Gran Tierra Energy
GTE
$357M
| $23.9K | ﹤0.01% |
3,817
+1,178
| +45% | +$9.63K |
|
|
ONIT
6952
CALL
Onity Group
ONIT
$296M
| $23.9K | ﹤0.01% |
600
+100
| +20% | +$3.95K |
|
6953
PUT
Packaging Corp of America
PKG
$21.1B
| $23.8K | ﹤0.01% |
100
| – | – |
|
|
CAIE
6954
Calamos Autocallable Income ETF
CAIE
$1.27B
| $23.8K | ﹤0.01% |
+875
| New | +$23.6K |
|
6955
CALL
MSC Industrial Direct
MSM
$6.78B
| $23.8K | ﹤0.01% |
+200
| New | +$21.2K |
|
|
INIO
6956
INNIO N.V.
INIO
$15.6B
| $23.7K | ﹤0.01% |
+599
| New | +$21.3K |
|
6957
Kaiser Aluminum
KALU
$2.68B
| $23.7K | ﹤0.01% |
121
-7,647
| -98% | -$1.3M |
|
6958
Fidelity Yield Enhanced Equity ETF
FYEE
$252M
| $23.7K | ﹤0.01% |
+819
| New | +$23.7K |
|
|
PR
6959
Permian Resources
PR
$19.6B
| $23.7K | ﹤0.01% |
1,285
-10,412
| -89% | -$209K |
|
6960
PUT
G-III Apparel Group
GIII
$1.17B
| $23.6K | ﹤0.01% |
700
-20,600
| -97% | -$650K |
|
6961
Schwab 5-10 Year Corporate Bond ETF
SCHI
$11.4B
| $23.5K | ﹤0.01% |
+1,038
| New | +$23.5K |
|
6962
ProFrac Holding
ACDC
$938M
| $23.5K | ﹤0.01% |
+4,042
| New | +$27.2K |
|
6963
PUT
First Bancorp
FBP
$4.35B
| $23.5K | ﹤0.01% |
+900
| New | +$21.7K |
|
6964
Avista
AVA
$3.14B
| $23.4K | ﹤0.01% |
572
-208
| -27% | -$8.56K |
|
6965
PUT
America Movil
AMX
$68.9B
| $23.4K | ﹤0.01% |
900
+800
| +800% | +$21K |
|
6966
PUT
Akebia Therapeutics
AKBA
$270M
| $23.3K | ﹤0.01% |
20,400
+18,500
| +974% | +$22K |
|
6967
iShares Core 80/20 Aggressive Allocation ETF
AOA
$3.31B
| $23.2K | ﹤0.01% |
+238
| New | +$22.7K |
|
6968
PUT
Vontier
VNT
$4.5B
| $23.2K | ﹤0.01% |
800
-1,000
| -56% | -$31.9K |
|
6969
Fuel Tech
FTEK
$48.4M
| $23.2K | ﹤0.01% |
10,491
+9,487
| +945% | +$14.1K |
|
|
CRESY
6970
Cresud
CRESY
$856M
| $23.1K | ﹤0.01% |
2,065
+171
| +9% | +$1.96K |
|
6971
Enliven Therapeutics
ELVN
$4.35B
| $23.1K | ﹤0.01% |
456
-7,427
| -94% | -$315K |
|
6972
PUT
Marqeta
MQ
$1.73B
| $23.1K | ﹤0.01% |
1,425
-50
| -3% | -$812 |
|
|
VBNK
6973
VersaBank
VBNK
$727M
| $23.1K | ﹤0.01% |
+997
| New | +$18K |
|
6974
CALL
Brookfield Infrastructure
BIPC
$4.6B
| $23.1K | ﹤0.01% |
+600
| New | +$24.2K |
|
6975
Nuvation Bio
NUVB
$2.39B
| $23.1K | ﹤0.01% |
4,066
-30,272
| -88% | -$148K |
|
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.