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 | +$237M | |
| 2 | +$103M | |
| 3 | +$93.9M | |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.5M |
| 5 |
Pinduoduo
PDD
|
+$61.3M |
Top Sells
| 1 | +$129M | |
| 2 | +$108M | |
| 3 | +$89.1M | |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$79.3M |
| 5 |
Micron Technology
MU
|
+$64.3M |
Sector Composition
| 1 | Technology | 34.04% |
| 2 | Consumer Discretionary | 13.08% |
| 3 | Healthcare | 10.63% |
| 4 | Financials | 7.02% |
| 5 | Industrials | 3.96% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
126
Mirion Technologies
MIR
$6.68B
| $4.71M | ﹤0.01% |
202,331
+83,382
|
|
||
|
FLG
127
Flagstar Bank National Association
FLG
$4.59B
| $4.68M | ﹤0.01% |
405,234
+151,109
|
|
||
128
Archer Aviation
ACHR
$5.63B
| $4.66M | ﹤0.01% |
486,861
+291,947
|
|
||
129
Lyft
LYFT
$9.81B
| $4.64M | ﹤0.01% |
211,048
-89,840
|
|
||
130
DraftKings
DKNG
$15.7B
| $4.6M | ﹤0.01% |
123,107
-9,941
|
|
||
131
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$238M
| $4.6M | ﹤0.01% |
138,761
+117,520
|
|
||
132
ProShares UltraPro Short QQQ
SQQQ
$1.81B
| $4.59M | ﹤0.01% |
+301,488
|
|
||
133
Snowflake
SNOW
$91.4B
| $4.58M | ﹤0.01% |
+20,298
|
|
||
134
Global X Defense Tech ETF
SHLD
$4.22B
| $4.58M | ﹤0.01% |
65,169
+39,936
|
|
||
135
AstraZeneca
AZN
$272B
| $4.56M | ﹤0.01% |
59,483
-41,810
|
|
||
136
Halliburton
HAL
$22.7B
| $4.53M | ﹤0.01% |
184,168
+133,941
|
|
||
137
Credo Technology Group
CRDO
$27.7B
| $4.51M | ﹤0.01% |
30,997
-4,218
|
|
||
138
UBS Group
UBS
$124B
| $4.51M | ﹤0.01% |
109,948
+74,402
|
|
||
139
NuScale Power
SMR
$4.35B
| $4.49M | ﹤0.01% |
124,678
+44,304
|
|
||
140
Roblox
RBLX
$73.2B
| $4.49M | ﹤0.01% |
+32,383
|
|
||
141
Wayfair
W
$14.6B
| $4.47M | ﹤0.01% |
+50,028
|
|
||
142
Atlassian
TEAM
$40.9B
| $4.46M | ﹤0.01% |
+27,934
|
|
||
143
EQT Corp
EQT
$38B
| $4.43M | ﹤0.01% |
81,422
+32,131
|
|
||
144
Spotify
SPOT
$133B
| $4.35M | ﹤0.01% |
6,236
+3,569
|
|
||
145
Nektar Therapeutics
NKTR
$1.17B
| $4.35M | ﹤0.01% |
76,450
+29,497
|
|
||
146
lululemon athletica
LULU
$20.3B
| $4.35M | ﹤0.01% |
24,432
-5,356
|
|
||
147
Okta
OKTA
$14.9B
| $4.32M | ﹤0.01% |
+47,070
|
|
||
148
Comcast
CMCSA
$102B
| $4.31M | ﹤0.01% |
+137,122
|
|
||
149
TE Connectivity
TEL
$72.5B
| $4.3M | ﹤0.01% |
19,606
+16,106
|
|
||
150
American Airlines Group
AAL
$8.88B
| $4.29M | ﹤0.01% |
381,568
-469,752
|
|