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
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$45.9M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$30.1M |
| 3 |
TWX
Time Warner Inc
TWX
|
+$25.8M |
| 4 |
Booking.com
BKNG
|
+$22.5M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$17.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$43.6M |
| 2 |
Amgen
AMGN
|
+$33.2M |
| 3 |
Baidu
BIDU
|
+$19.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$17.3M |
| 5 |
Micron Technology
MU
|
+$17.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 14.31% |
| 2 | Technology | 13.17% |
| 3 | Communication Services | 11.81% |
| 4 | Healthcare | 4.06% |
| 5 | Financials | 3.84% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
51
Mastercard
MA
$476B
| $7.99M | 0.33% |
56,609
-36,701
| -39% | -$4.86M |
|
52
CALL
Netflix
NFLX
$286B
| $7.42M | 0.3% |
53,690
+16,550
| +45% | +$289K |
|
53
CALL
Berkshire Hathaway Class B
BRK.B
$1.06T
| $7.29M | 0.3% |
2,990
+226
| +8% | +$39.9K |
|
54
Wells Fargo
WFC
$266B
| $7.25M | 0.3% |
131,568
+47,175
| +56% | +$2.51M |
|
55
T-Mobile US
TMUS
$206B
| $7.21M | 0.29% |
116,967
-35,638
| -23% | -$2.23M |
|
56
Applied Materials
AMAT
$448B
| $7.1M | 0.29% |
136,299
+54,174
| +66% | +$2.45M |
|
57
CALL
Invesco QQQ Trust
QQQ
$471B
| $7.05M | 0.29% |
17,604
-7,083
| -29% | -$1.01M |
|
58
Mondelez International
MDLZ
$76.8B
| $6.94M | 0.28% |
170,798
-145,855
| -46% | -$6.19M |
|
|
59
CALL
Baidu
BIDU
$36.8B
| $6.56M | 0.27% |
3,337
+2,153
| +182% | +$470K |
|
60
PUT
Chipotle Mexican Grill
CMG
$42.7B
| $6.55M | 0.27% |
149,750
+56,700
| +61% | +$382K |
|
61
PUT
Apple
AAPL
$4.81T
| $6.34M | 0.26% |
51,208
-11,184
| -18% | -$434K |
|
62
Wynn Resorts
WYNN
$9.82B
| $6.15M | 0.25% |
41,317
+41,117
| +20,559% | +$5.61M |
|
63
ConocoPhillips
COP
$143B
| $6.06M | 0.25% |
121,169
+200
| +0.2% | +$8.99K |
|
64
United Airlines
UAL
$38.2B
| $6M | 0.24% |
98,542
+71,890
| +270% | +$4.79M |
|
|
UCD
65
PUT
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $5.99M | 0.24% |
19,785
+4,903
| +33% | +$1.48M |
|
66
Visa
V
$677B
| $5.89M | 0.24% |
55,934
-73,080
| -57% | -$7.41M |
|
67
Colgate-Palmolive
CL
$72.4B
| $5.84M | 0.24% |
80,128
+42,071
| +111% | +$3.03M |
|
|
ALR
68
DELISTED
Alere Inc
ALR
| $5.79M | 0.24% |
113,533
+81,786
| +258% | +$4.08M |
|
|
69
CALL
Booking.com
BKNG
$139B
| $5.45M | 0.22% |
14,650
-5,300
| -27% | -$402K |
|
70
APA Corp
APA
$12.6B
| $5.41M | 0.22% |
+118,044
| New | +$5.2M |
|
|
COL
71
DELISTED
Rockwell Collins
COL
| $5.38M | 0.22% |
41,162
+31,684
| +334% | +$3.85M |
|
72
Nike
NKE
$63.7B
| $5.23M | 0.21% |
+100,895
| New | +$5.66M |
|
|
KITE
73
DELISTED
Kite Pharma, Inc.
KITE
| $5.18M | 0.21% |
+28,828
| New | +$4.02M |
|
74
VanEck Semiconductor ETF
SMH
$70.3B
| $5.09M | 0.21% |
+109,084
| New | +$4.77M |
|
75
MGM Resorts International
MGM
$11.7B
| $5.07M | 0.21% |
155,685
+147,682
| +1,845% | +$4.75M |
|
Similar funds
Simplex Trading's Q3 2017 Portfolio in Review
As of Q3 2017, Simplex Trading held 7,357 positions worth $2.45B, up 6.4% from $2.3B the previous quarter. Its ten largest holdings account for 24% of the portfolio.
Simplex Trading's Q3 2017 filing shows 1,313 new, 2,078 increased, 2,339 reduced and 1,500 closed positions. Its largest new stake was iShares Russell 2000 ETF: 214,170 shares worth $31.7M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $43.6M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, up from 9.7% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q3 2017 buy was iShares Russell 2000 ETF: 214,170 shares worth $31.7M.
- Simplex Trading added most to Amazon in Q3 2017, an estimated $45.9M increase.
- Simplex Trading's biggest Q3 2017 reduction was Baidu, cutting an estimated $19.3M.
- Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q3 2017, selling an estimated $43.6M.
- Simplex Trading's ten largest holdings make up 24% of its $2.45B portfolio in Q3 2017.
- Simplex Trading opened 1,313 new positions and closed 1,500 in Q3 2017.
- Simplex Trading's portfolio value rose 6.4% quarter-over-quarter to $2.45B.
Based on Simplex Trading's 13F filing for Q3 2017, filed 25 Oct 2017.