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 | |
|---|---|---|---|---|---|---|
701
Regenxbio
RGNX
$483M
| $305K | ﹤0.01% |
15,272
+12,574
| +466% | +$251K |
|
702
ProShares Ultra Silver
AGQ
$853M
| $304K | ﹤0.01% |
+11,314
| New | +$304K |
|
703
Guidewire Software
GWRE
$21.3B
| $304K | ﹤0.01% |
4,002
+2,050
| +105% | +$156K |
|
704
iQIYI
IQ
$2.5B
| $303K | ﹤0.01% |
+56,812
| New | +$303K |
|
705
Manhattan Associates
MANH
$12.8B
| $303K | ﹤0.01% |
+1,516
| New | +$303K |
|
706
Arlo Technologies
ARLO
$1.77B
| $301K | ﹤0.01% |
27,655
+26,024
| +1,596% | +$283K |
|
707
dLocal
DLO
$4.02B
| $301K | ﹤0.01% |
+24,702
| New | +$301K |
|
|
DX
708
Dynex Capital
DX
$1.65B
| $301K | ﹤0.01% |
23,984
-10,239
| -30% | -$129K |
|
|
EDR
709
DELISTED
Endeavor Group Holdings, Inc.
EDR
| $301K | ﹤0.01% |
+12,608
| New | +$301K |
|
710
Papa John's
PZZA
$1.63B
| $299K | ﹤0.01% |
4,054
-28,840
| -88% | -$2.13M |
|
711
ProShares UltraShort Yen
YCS
$30.7M
| $297K | ﹤0.01% |
8,752
-32,686
| -79% | -$1.11M |
|
712
Burford Capital
BUR
$2.73B
| $296K | ﹤0.01% |
24,353
-82,098
| -77% | -$998K |
|
713
iShares Core S&P Mid-Cap ETF
IJH
$100B
| $296K | ﹤0.01% |
5,665
-16,880
| -75% | -$882K |
|
714
Vanguard Long-Term Treasury ETF
VGLT
$10.1B
| $296K | ﹤0.01% |
+4,667
| New | +$296K |
|
715
SK Telecom
SKM
$8.33B
| $295K | ﹤0.01% |
15,127
+7,456
| +97% | +$145K |
|
716
Modine Manufacturing
MOD
$7.95B
| $293K | ﹤0.01% |
+8,894
| New | +$293K |
|
|
HDRO
717
DELISTED
Defiance Next Gen H2 ETF
HDRO
| $293K | ﹤0.01% |
4,422
-6,126
| -58% | -$406K |
|
718
Alto Ingredients
ALTO
$89M
| $292K | ﹤0.01% |
101,310
+37,760
| +59% | +$109K |
|
719
Seres Therapeutics
MCRB
$154M
| $292K | ﹤0.01% |
3,051
-2,704
| -47% | -$259K |
|
720
SLM Corp
SLM
$6.01B
| $292K | ﹤0.01% |
17,912
+9,007
| +101% | +$147K |
|
721
PIMCO 25+ Year Zero Coupon US Treasury Index Exchange-Traded Fund
ZROZ
$1.72B
| $292K | ﹤0.01% |
3,180
+2,346
| +281% | +$215K |
|
|
VRN
722
DELISTED
Veren
VRN
| $292K | ﹤0.01% |
43,434
-28,699
| -40% | -$193K |
|
723
Anavex Life Sciences
AVXL
$763M
| $291K | ﹤0.01% |
35,867
-25,338
| -41% | -$206K |
|
724
The Greenbrier Companies
GBX
$1.42B
| $291K | ﹤0.01% |
+6,774
| New | +$291K |
|
725
Invesco Mortgage Capital
IVR
$515M
| $290K | ﹤0.01% |
25,344
-13,359
| -35% | -$153K |
|