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 |
Microsoft
MSFT
|
+$101M |
| 2 |
NVIDIA
NVDA
|
+$66M |
| 3 |
Citigroup
C
|
+$51.8M |
| 4 |
Berkshire Hathaway Class B
BRK.B
|
+$42.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$39.4M |
Top Sells
| 1 |
Apple
AAPL
|
+$411M |
| 2 |
Vanguard S&P 500 ETF
VOO
|
+$64M |
| 3 |
Meta Platforms (Facebook)
META
|
+$39.8M |
| 4 |
iShares Core S&P 500 ETF
IVV
|
+$34.3M |
| 5 |
PayPal
PYPL
|
+$32.9M |
Sector Composition
| 1 | Technology | 17.4% |
| 2 | Financials | 12.04% |
| 3 | Consumer Discretionary | 10.17% |
| 4 | Healthcare | 8.63% |
| 5 | Industrials | 6.03% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
776
Hologic
HOLX
$14.8B
| $277K | ﹤0.01% |
4,306
-12,614
| -75% | -$811K |
|
777
Open Text
OTEX
$8.96B
| $277K | ﹤0.01% |
10,477
+9,439
| +909% | +$250K |
|
778
Invesco Solar ETF
TAN
$727M
| $276K | ﹤0.01% |
3,750
+1,620
| +76% | +$119K |
|
779
Comstock Resources
CRK
$4.69B
| $275K | ﹤0.01% |
+15,931
| New | +$275K |
|
780
Cedar Fair
FUN
$2.2B
| $275K | ﹤0.01% |
6,683
-3,786
| -36% | -$156K |
|
781
ImmunityBio
IBRX
$2.45B
| $274K | ﹤0.01% |
55,252
+14,400
| +35% | +$71.4K |
|
782
VanEck Brazil Small-Cap ETF
BRF
$21.8M
| $273K | ﹤0.01% |
17,885
+15,820
| +766% | +$241K |
|
783
Fluence Energy
FLNC
$909M
| $272K | ﹤0.01% |
18,672
+8,282
| +80% | +$121K |
|
|
AIV
784
Aimco
AIV
$1.08B
| $271K | ﹤0.01% |
37,127
-41,568
| -53% | -$303K |
|
785
AvalonBay Communities
AVB
$28B
| $271K | ﹤0.01% |
1,475
-725
| -33% | -$133K |
|
786
NexGen Energy
NXE
$4.5B
| $271K | ﹤0.01% |
73,959
+69,116
| +1,427% | +$253K |
|
|
OBE
787
Obsidian Energy
OBE
$405M
| $271K | ﹤0.01% |
37,821
-16,398
| -30% | -$117K |
|
788
Sun Communities
SUI
$16.4B
| $271K | ﹤0.01% |
2,006
+326
| +19% | +$44K |
|
|
BECN
789
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $271K | ﹤0.01% |
+4,965
| New | +$271K |
|
790
Petrobras Class A
PBR.A
$75.1B
| $269K | ﹤0.01% |
24,361
+22,129
| +991% | +$244K |
|
|
OLK
791
DELISTED
Olink Holding AB (publ) American Depositary Shares
OLK
| $269K | ﹤0.01% |
22,234
+9,993
| +82% | +$121K |
|
792
The Greenbrier Companies
GBX
$1.46B
| $268K | ﹤0.01% |
+11,073
| New | +$268K |
|
793
Helix Energy Solutions
HLX
$932M
| $267K | ﹤0.01% |
+69,310
| New | +$267K |
|
794
International Money Express
IMXI
$431M
| $267K | ﹤0.01% |
11,745
-3,624
| -24% | -$82.4K |
|
795
Papa John's
PZZA
$1.64B
| $267K | ﹤0.01% |
+3,827
| New | +$267K |
|
796
Paycom
PAYC
$12.7B
| $264K | ﹤0.01% |
803
-1,109
| -58% | -$365K |
|
797
Smith Micro Software
SMSI
$15.4M
| $264K | ﹤0.01% |
14,622
+13
| +0.1% | +$235 |
|
|
SLGC
798
DELISTED
SomaLogic, Inc. Class A Common Stock
SLGC
| $264K | ﹤0.01% |
91,364
+57,729
| +172% | +$167K |
|
799
First Trust Natural Gas ETF
FCG
$332M
| $263K | ﹤0.01% |
11,522
+9,328
| +425% | +$213K |
|
800
iShares US Financial Services ETF
IYG
$1.94B
| $262K | ﹤0.01% |
5,571
+1,479
| +36% | +$69.6K |
|