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 |
Alphabet (Google) Class C
GOOG
|
$41.4M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
$12.3M |
| 3 |
SPDR S&P 500 ETF Trust
SPY
|
$9.89M |
| 4 |
Alibaba
BABA
|
$9.66M |
| 5 |
Intel
INTC
|
$9.11M |
Top Sells
| 1 |
Apple
AAPL
|
$36.8M |
| 2 |
Gilead Sciences
GILD
|
$31.2M |
| 3 |
Booking.com
BKNG
|
$29M |
| 4 |
Amazon
AMZN
|
$25.6M |
| 5 |
Baidu
BIDU
|
$12.9M |
Sector Composition
| 1 | Communication Services | 13.31% |
| 2 | Consumer Discretionary | 13.07% |
| 3 | Healthcare | 12.41% |
| 4 | Technology | 11.91% |
| 5 | Financials | 8.28% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
26
UnitedHealth
UNH
$279B
| $3.15M | 0.37% |
26,609
+24,045
| +938% | +$2.84M |
|
27
Boeing
BA
$176B
| $3.07M | 0.36% |
20,423
+7,523
| +58% | +$1.13M |
|
|
TWTR
28
DELISTED
Twitter, Inc.
TWTR
| $2.96M | 0.34% |
59,038
-151,469
| -72% | -$7.58M |
|
29
WisdomTree Japan Hedged Equity Fund
DXJ
$3.73B
| $2.93M | 0.34% |
53,175
-28,110
| -35% | -$1.55M |
|
30
Caterpillar
CAT
$195B
| $2.89M | 0.34% |
+36,123
| New | +$2.89M |
|
31
Biogen
BIIB
$21B
| $2.88M | 0.34% |
+6,826
| New | +$2.88M |
|
32
Microsoft
MSFT
$3.76T
| $2.86M | 0.33% |
70,264
-111,358
| -61% | -$4.53M |
|
33
VanEck Junior Gold Miners ETF
GDXJ
$6.96B
| $2.85M | 0.33% |
125,426
+123,027
| +5,128% | +$2.79M |
|
34
Kinder Morgan
KMI
$59.4B
| $2.83M | 0.33% |
67,228
+5,826
| +9% | +$245K |
|
|
YHOO
35
DELISTED
Yahoo Inc
YHOO
| $2.71M | 0.32% |
61,009
-18,289
| -23% | -$812K |
|
36
Meta Platforms (Facebook)
META
$1.86T
| $2.7M | 0.31% |
32,819
-13,000
| -28% | -$1.07M |
|
37
iShares Biotechnology ETF
IBB
$5.73B
| $2.63M | 0.31% |
+7,646
| New | +$2.63M |
|
38
Western Digital
WDC
$29.5B
| $2.6M | 0.3% |
+28,592
| New | +$2.6M |
|
|
DD
39
DELISTED
Du Pont De Nemours E I
DD
| $2.58M | 0.3% |
36,142
+29,137
| +416% | +$2.08M |
|
40
Ionis Pharmaceuticals
IONS
$9.69B
| $2.56M | 0.3% |
+40,248
| New | +$2.56M |
|
|
TWC
41
DELISTED
TIME WARNER CABLE INC NEW COM STK
TWC
| $2.54M | 0.3% |
+16,935
| New | +$2.54M |
|
42
iShares US Real Estate ETF
IYR
$3.7B
| $2.34M | 0.27% |
+29,522
| New | +$2.34M |
|
|
MNDT
43
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $2.28M | 0.27% |
58,092
+10,317
| +22% | +$405K |
|
|
ICPT
44
DELISTED
Intercept Pharmaceuticals, Inc.
ICPT
| $2.24M | 0.26% |
+7,929
| New | +$2.24M |
|
|
VMW
45
DELISTED
VMware, Inc
VMW
| $2.15M | 0.25% |
26,246
-6,463
| -20% | -$530K |
|
46
GoPro
GPRO
$245M
| $2.11M | 0.24% |
48,507
+28,924
| +148% | +$1.26M |
|
47
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
$17.7B
| $2.1M | 0.24% |
+23,215
| New | +$2.1M |
|
|
CBI
48
DELISTED
Chicago Bridge & Iron Nv
CBI
| $2.09M | 0.24% |
+42,460
| New | +$2.09M |
|
49
W.W. Grainger
GWW
$48.6B
| $2.06M | 0.24% |
8,729
+8,253
| +1,734% | +$1.95M |
|
50
HCA Healthcare
HCA
$94.7B
| $2.03M | 0.24% |
+26,933
| New | +$2.03M |
|