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
| 1 |
NVIDIA
NVDA
|
+$60M |
| 2 |
Microsoft
MSFT
|
+$58.6M |
| 3 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$52.5M |
| 4 |
PayPal
PYPL
|
+$40.9M |
| 5 |
Netflix
NFLX
|
+$29.7M |
Top Sells
| 1 |
Apple
AAPL
|
+$48.7M |
| 2 |
Walmart
WMT
|
+$45.2M |
| 3 |
Adobe
ADBE
|
+$40.6M |
| 4 |
VanEck Oil Services ETF
OIH
|
+$34.2M |
| 5 |
Enphase Energy
ENPH
|
+$27.2M |
Sector Composition
| 1 | Technology | 21.17% |
| 2 | Healthcare | 10.87% |
| 3 | Consumer Discretionary | 10.73% |
| 4 | Communication Services | 10.55% |
| 5 | Financials | 7.54% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
801
Mersana Therapeutics
MRSN
$37.3M
| $216K | ﹤0.01% |
2,634
+812
| +45% | +$66.6K |
|
802
Bumble
BMBL
$702M
| $215K | ﹤0.01% |
+12,865
| New | +$215K |
|
803
ProShares Ultra Dow30
DDM
$452M
| $215K | ﹤0.01% |
3,201
+2,035
| +175% | +$137K |
|
804
Liquidia Corp
LQDA
$2.32B
| $215K | ﹤0.01% |
27,461
+22,568
| +461% | +$177K |
|
805
Energy Fuels
UUUU
$2.89B
| $215K | ﹤0.01% |
34,519
-85,631
| -71% | -$533K |
|
806
Equity Residential
EQR
$25.5B
| $214K | ﹤0.01% |
+3,259
| New | +$214K |
|
807
Vanguard Mid-Cap ETF
VO
$88.6B
| $214K | ﹤0.01% |
975
-1,187
| -55% | -$261K |
|
808
ProShares UltraPro Short 20+ Year Treasury
TTT
$21.5M
| $212K | ﹤0.01% |
3,238
+1,556
| +93% | +$102K |
|
809
Flex
FLEX
$21.6B
| $211K | ﹤0.01% |
+10,178
| New | +$211K |
|
810
RLI Corp
RLI
$6.15B
| $210K | ﹤0.01% |
+3,084
| New | +$210K |
|
811
iShares National Muni Bond ETF
MUB
$39.5B
| $209K | ﹤0.01% |
+1,959
| New | +$209K |
|
|
SA
812
Seabridge Gold
SA
$1.9B
| $208K | ﹤0.01% |
17,315
+10,091
| +140% | +$121K |
|
813
TG Therapeutics
TGTX
$5.15B
| $208K | ﹤0.01% |
8,385
-62,285
| -88% | -$1.55M |
|
814
ARK Autonomous Technology & Robotics ETF
ARKQ
$1.33B
| $207K | ﹤0.01% |
+3,685
| New | +$207K |
|
815
ProShares Short Bitcoin Strategy ETF
BITI
$74M
| $206K | ﹤0.01% |
2,191
+1,321
| +152% | +$124K |
|
816
Mister Car Wash
MCW
$1.81B
| $206K | ﹤0.01% |
+21,400
| New | +$206K |
|
817
Alliant Energy
LNT
$16.6B
| $205K | ﹤0.01% |
3,925
-40,086
| -91% | -$2.09M |
|
818
Vanguard Russell 2000 ETF
VTWO
$12.9B
| $205K | ﹤0.01% |
2,714
+519
| +24% | +$39.2K |
|
819
Bain Capital Specialty
BCSF
$1.01B
| $203K | ﹤0.01% |
15,059
-10,163
| -40% | -$137K |
|
820
FIGS
FIGS
$1.19B
| $203K | ﹤0.01% |
+24,558
| New | +$203K |
|
821
Light & Wonder
LNW
$7.42B
| $203K | ﹤0.01% |
2,958
+1,638
| +124% | +$112K |
|
822
UDR
UDR
$12.9B
| $201K | ﹤0.01% |
4,685
+247
| +6% | +$10.6K |
|
823
Herbalife
HLF
$964M
| $200K | ﹤0.01% |
15,174
-3,470
| -19% | -$45.7K |
|
824
Olin
OLN
$3.09B
| $200K | ﹤0.01% |
3,892
-8,711
| -69% | -$448K |
|
|
HIMX
825
Himax Technologies
HIMX
$1.45B
| $198K | ﹤0.01% |
+29,413
| New | +$198K |
|