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 | +$216M | |
| 2 | +$159M | |
| 3 | +$128M | |
| 4 |
Booking.com
BKNG
|
+$62.2M |
| 5 |
SPDR S&P 500 ETF Trust
SPY
|
+$61.9M |
Top Sells
| 1 | +$141M | |
| 2 | +$53.1M | |
| 3 | +$45.7M | |
| 4 |
Netflix
NFLX
|
+$45.3M |
| 5 |
Pfizer
PFE
|
+$38.3M |
Sector Composition
| 1 | Technology | 34.74% |
| 2 | Communication Services | 9% |
| 3 | Consumer Discretionary | 8.67% |
| 4 | Healthcare | 8.07% |
| 5 | Financials | 6.38% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
101
DraftKings
DKNG
$15.7B
| $5.71M | ﹤0.01% |
133,048
+67,813
|
|
||
102
Seagate
STX
$60.5B
| $5.39M | ﹤0.01% |
+37,369
|
|
||
103
Abbott
ABT
$224B
| $5.39M | ﹤0.01% |
+39,639
|
|
||
104
GSK
GSK
$96.6B
| $5.21M | ﹤0.01% |
+135,595
|
|
||
105
MongoDB
MDB
$29.7B
| $5.05M | ﹤0.01% |
+24,049
|
|
||
106
iShares MSCI China ETF
MCHI
$8.33B
| $5.02M | ﹤0.01% |
+91,103
|
|
||
107
Eos Energy Enterprises
EOSE
$4.98B
| $4.98M | ﹤0.01% |
972,664
+61,948
|
|
||
108
C3.ai
AI
$2.04B
| $4.96M | ﹤0.01% |
201,899
+94,356
|
|
||
|
TIGR
109
UP Fintech Holding
TIGR
$1.84B
| $4.87M | ﹤0.01% |
504,169
-271,637
|
|
||
110
ServiceNow
NOW
$180B
| $4.81M | ﹤0.01% |
4,675
-3,808
|
|
||
111
BigBear.ai
BBAI
$3.13B
| $4.79M | ﹤0.01% |
705,719
+533,466
|
|
||
112
Woodward
WWD
$16.4B
| $4.75M | ﹤0.01% |
19,377
+18,266
|
|
||
113
Lyft
LYFT
$9.81B
| $4.74M | ﹤0.01% |
300,888
+294,699
|
|
||
114
Direxion Daily Small Cap Bull 3x Shares
TNA
$2.31B
| $4.72M | ﹤0.01% |
140,768
+96,716
|
|
||
115
State Street SPDR S&P Bank ETF
KBE
$1.46B
| $4.72M | ﹤0.01% |
84,604
-20,864
|
|
||
116
Hilton Worldwide
HLT
$63.9B
| $4.67M | ﹤0.01% |
17,550
+15,137
|
|
||
117
YieldMax MSTR Option Income Strategy ETF
MSTY
$2.58B
| $4.58M | ﹤0.01% |
206,692
+83,883
|
|
||
118
CleanSpark
CLSK
$3.97B
| $4.54M | ﹤0.01% |
411,956
-117,687
|
|
||
119
Oscar Health
OSCR
$4.35B
| $4.52M | ﹤0.01% |
+210,776
|
|
||
120
Teladoc Health
TDOC
$1.33B
| $4.42M | ﹤0.01% |
507,190
+292,251
|
|
||
121
XPeng
XPEV
$26B
| $4.4M | ﹤0.01% |
+246,121
|
|
||
|
QXO
122
QXO Inc
QXO
$12.7B
| $4.37M | ﹤0.01% |
202,888
+68,303
|
|
||
123
Sunrun
RUN
$4.51B
| $4.34M | ﹤0.01% |
530,872
+462,813
|
|
||
124
Canadian Pacific Kansas City
CP
$65.2B
| $4.32M | ﹤0.01% |
54,477
-38,742
|
|
||
125
BP
BP
$94.2B
| $4.24M | ﹤0.01% |
+141,526
|
|