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 | |
|---|---|---|---|---|---|---|
1
NVIDIA
NVDA
$4.72T
| $392M | 0.22% |
2,481,314
+1,367,934
|
|
||
2
Apple
AAPL
$4.04T
| $210M | 0.12% |
1,021,727
+772,959
|
|
||
3
Broadcom
AVGO
$1.68T
| $152M | 0.09% |
551,694
+464,849
|
|
||
4
iShares 20+ Year Treasury Bond ETF
TLT
$48.5B
| $129M | 0.07% |
1,457,996
-1,599,982
|
|
||
5
Alphabet (Google) Class A
GOOGL
$3.46T
| $126M | 0.07% |
714,528
+168,881
|
|
||
|
6
Booking.com
BKNG
$167B
| $78.5M | 0.05% |
13,563
+10,736
|
|
||
7
Micron Technology
MU
$275B
| $75.9M | 0.04% |
616,179
-37,759
|
|
||
|
8
Alphabet (Google) Class C
GOOG
$3.47T
| $63.5M | 0.04% |
357,870
+283,043
|
|
||
9
TSMC
TSM
$1.51T
| $63.2M | 0.04% |
278,926
-201,596
|
|
||
|
10
SPDR S&P 500 ETF Trust
SPY
$679B
| $61.9M | 0.04% |
+100,129
|
|
||
11
Meta Platforms (Facebook)
META
$1.54T
| $58.7M | 0.03% |
+79,568
|
|
||
12
UnitedHealth
UNH
$307B
| $56.2M | 0.03% |
180,167
+144,106
|
|
||
13
Intel
INTC
$181B
| $54.7M | 0.03% |
2,441,452
-938,844
|
|
||
14
Advanced Micro Devices
AMD
$421B
| $48.5M | 0.03% |
+342,008
|
|
||
15
Health Care Select Sector SPDR Fund
XLV
$37.7B
| $45M | 0.03% |
333,580
+306,130
|
|
||
16
iShares Russell 2000 ETF
IWM
$69.9B
| $41.6M | 0.02% |
+192,597
|
|
||
17
Nike
NKE
$94.9B
| $37.1M | 0.02% |
522,792
-14,487
|
|
||
18
Alibaba
BABA
$377B
| $35.7M | 0.02% |
+314,372
|
|
||
19
Robinhood
HOOD
$120B
| $28.2M | 0.02% |
301,109
+201,736
|
|
||
20
iShares MSCI Brazil ETF
EWZ
$6.13B
| $27.6M | 0.02% |
955,457
+869,110
|
|
||
21
SPDR Gold Trust
GLD
$134B
| $26.2M | 0.02% |
+85,931
|
|
||
22
Cigna
CI
$72.3B
| $25.4M | 0.01% |
76,861
-1,441
|
|
||
23
SoFi Technologies
SOFI
$38.8B
| $25.1M | 0.01% |
1,380,363
+305,953
|
|
||
24
Financial Select Sector SPDR Fund
XLF
$55.2B
| $23.7M | 0.01% |
+453,315
|
|
||
25
KraneShares CSI China Internet ETF
KWEB
$9.03B
| $22.2M | 0.01% |
645,901
-4,332
|
|