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 |
Boeing
BA
|
+$49.5M |
| 2 |
Pinduoduo
PDD
|
+$45.3M |
| 3 |
Microsoft
MSFT
|
+$42.5M |
| 4 |
Apple
AAPL
|
+$33.3M |
| 5 |
Direxion Daily Semiconductor Bull 3X Shares
SOXL
|
+$25.4M |
Top Sells
| 1 |
Broadcom
AVGO
|
+$95.4M |
| 2 |
Citigroup
C
|
+$57.9M |
| 3 |
Pfizer
PFE
|
+$55.9M |
| 4 |
TSMC
TSM
|
+$40.4M |
| 5 |
Starbucks
SBUX
|
+$40.4M |
Sector Composition
| 1 | Technology | 23.11% |
| 2 | Consumer Discretionary | 16.53% |
| 3 | Healthcare | 8.58% |
| 4 | Industrials | 7.58% |
| 5 | Financials | 7.29% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
776
Ascendis Pharma
ASND
$12.1B
| $288K | ﹤0.01% |
+1,934
| New | +$288K |
|
777
Portillo's
PTLO
$441M
| $288K | ﹤0.01% |
21,391
+4,264
| +25% | +$57.4K |
|
778
Ceco Environmental
CECO
$1.7B
| $286K | ﹤0.01% |
10,142
+1,017
| +11% | +$28.7K |
|
779
DHT Holdings
DHT
$1.95B
| $284K | ﹤0.01% |
+25,762
| New | +$284K |
|
780
Central Garden & Pet
CENT
$2.29B
| $283K | ﹤0.01% |
+7,770
| New | +$283K |
|
781
Dream Finders Homes
DFH
$2.86B
| $283K | ﹤0.01% |
+7,841
| New | +$283K |
|
782
Phathom Pharmaceuticals
PHAT
$854M
| $283K | ﹤0.01% |
+15,698
| New | +$283K |
|
|
MRO
783
DELISTED
Marathon Oil Corporation
MRO
| $281K | ﹤0.01% |
+10,567
| New | +$281K |
|
784
Baytex Energy
BTE
$1.81B
| $280K | ﹤0.01% |
94,401
-2,141
| -2% | -$6.35K |
|
785
Cooper Companies
COO
$13.6B
| $279K | ﹤0.01% |
+2,529
| New | +$279K |
|
786
FS KKR Capital
FSK
$5.01B
| $279K | ﹤0.01% |
+14,142
| New | +$279K |
|
787
Cheesecake Factory
CAKE
$2.9B
| $278K | ﹤0.01% |
+6,867
| New | +$278K |
|
788
Ionis Pharmaceuticals
IONS
$10.1B
| $278K | ﹤0.01% |
6,944
-56,403
| -89% | -$2.26M |
|
789
Dynavax Technologies
DVAX
$1.13B
| $276K | ﹤0.01% |
24,829
+17,787
| +253% | +$198K |
|
790
BlackBerry
BB
$2.28B
| $275K | ﹤0.01% |
105,091
-74,133
| -41% | -$194K |
|
791
Matador Resources
MTDR
$6.07B
| $275K | ﹤0.01% |
5,579
+836
| +18% | +$41.2K |
|
792
Blue Bird Corp
BLBD
$1.86B
| $274K | ﹤0.01% |
+5,720
| New | +$274K |
|
793
Domo
DOMO
$669M
| $274K | ﹤0.01% |
36,537
-67,338
| -65% | -$505K |
|
794
Arista Networks
ANET
$192B
| $273K | ﹤0.01% |
+2,848
| New | +$273K |
|
795
Reddit
RDDT
$49.3B
| $273K | ﹤0.01% |
4,151
-33,205
| -89% | -$2.18M |
|
796
Aehr Test Systems
AEHR
$840M
| $271K | ﹤0.01% |
21,162
-11,657
| -36% | -$149K |
|
797
Manchester United
MANU
$2.77B
| $271K | ﹤0.01% |
16,775
-13,809
| -45% | -$223K |
|
|
BDN
798
Brandywine Realty Trust
BDN
$782M
| $268K | ﹤0.01% |
49,445
+28,730
| +139% | +$156K |
|
|
DRD
799
DRDGold
DRD
$1.97B
| $267K | ﹤0.01% |
27,792
+24,645
| +783% | +$237K |
|
800
Opko Health
OPK
$1.14B
| $265K | ﹤0.01% |
178,187
-212,320
| -54% | -$316K |
|