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 | +$278M | |
| 2 | +$84.4M | |
| 3 | +$76.9M | |
| 4 |
TSMC
TSM
|
+$74.9M |
| 5 |
Amazon
AMZN
|
+$53.5M |
Top Sells
| 1 | +$497M | |
| 2 | +$73.7M | |
| 3 | +$49M | |
| 4 |
Advanced Micro Devices
AMD
|
+$48.1M |
| 5 |
Uber
UBER
|
+$41.8M |
Sector Composition
| 1 | Technology | 22.9% |
| 2 | Consumer Discretionary | 12.26% |
| 3 | Healthcare | 9.52% |
| 4 | Communication Services | 8.42% |
| 5 | Financials | 7.07% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1
iShares 20+ Year Treasury Bond ETF
TLT
$48.4B
| $278M | 0.18% |
+3,057,978
|
|
||
2
NVIDIA
NVDA
$4.84T
| $121M | 0.08% |
1,113,380
+709,408
|
|
||
3
Alphabet (Google) Class A
GOOGL
$3.35T
| $84.4M | 0.05% |
+545,647
|
|
||
|
4
TSMC
TSM
$1.53T
| $79.8M | 0.05% |
480,522
+451,305
|
|
||
5
Intel
INTC
$176B
| $76.8M | 0.05% |
3,380,296
-190,644
|
|
||
6
Micron Technology
MU
$245B
| $56.8M | 0.04% |
653,938
+613,262
|
|
||
7
Apple
AAPL
$3.99T
| $55.3M | 0.04% |
248,768
-2,235,748
|
|
||
|
8
Amazon
AMZN
$2.67T
| $53.5M | 0.03% |
+281,158
|
|
||
9
Pfizer
PFE
$191B
| $41M | 0.03% |
1,616,802
+50,149
|
|
||
10
Citigroup
C
$181B
| $36.8M | 0.02% |
519,037
-168,447
|
|
||
11
Nike
NKE
$90.5B
| $34.1M | 0.02% |
537,279
-53,645
|
|
||
12
Netflix
NFLX
$463B
| $32.8M | 0.02% |
+35,144
|
|
||
13
Tesla
TSLA
$1.48T
| $30.4M | 0.02% |
117,279
+107,115
|
|
||
14
Baidu
BIDU
$43B
| $30.3M | 0.02% |
328,925
+65,746
|
|
||
15
Constellation Energy
CEG
$113B
| $27.2M | 0.02% |
135,142
+75,144
|
|
||
16
Arm
ARM
$170B
| $27M | 0.02% |
252,824
+67,022
|
|
||
17
Cigna
CI
$70.7B
| $25.8M | 0.02% |
78,302
-8,753
|
|
||
|
B
18
Barrick Mining
B
$54B
| $24M | 0.02% |
1,235,654
-582,333
|
|
||
19
iShares Bitcoin Trust
IBIT
$77.1B
| $23.5M | 0.02% |
+503,019
|
|
||
20
Dell
DELL
$104B
| $23.1M | 0.01% |
253,933
+151,761
|
|
||
21
KraneShares CSI China Internet ETF
KWEB
$8.97B
| $22.7M | 0.01% |
650,233
+647,364
|
|
||
22
CVS Health
CVS
$99.1B
| $22.5M | 0.01% |
332,331
-125,135
|
|
||
23
ProShares Short QQQ
PSQ
$517M
| $20.1M | 0.01% |
495,320
+39,852
|
|
||
24
Energy Transfer Partners
ET
$56.8B
| $19.6M | 0.01% |
1,055,768
-122,901
|
|
||
25
State Street SPDR S&P Biotech ETF
XBI
$6.26B
| $19.5M | 0.01% |
241,039
-61,655
|
|