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 |
Alphabet (Google) Class C
GOOG
|
+$40.1M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
+$12.5M |
| 3 |
Alibaba
BABA
|
+$10.5M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.89M |
| 5 |
Intel
INTC
|
+$9.83M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$35.7M |
| 2 |
Gilead Sciences
GILD
|
+$32.3M |
| 3 |
Amazon
AMZN
|
+$29M |
| 4 |
Booking.com
BKNG
|
+$28.4M |
| 5 |
Baidu
BIDU
|
+$13.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 7.76% |
| 2 | Consumer Discretionary | 7.62% |
| 3 | Healthcare | 7.24% |
| 4 | Technology | 6.95% |
| 5 | Financials | 4.83% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
76
PUT
Amazon
AMZN
$2.66T
| $2.2M | 0.26% |
+84,980
| New | +$1.49M |
|
|
VMW
77
DELISTED
VMware, Inc
VMW
| $2.15M | 0.25% |
26,246
-6,463
| -20% | -$529K |
|
78
GoPro
GPRO
$118M
| $2.1M | 0.24% |
48,507
+28,924
| +148% | +$1.36M |
|
79
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
$16.4B
| $2.1M | 0.24% |
+23,215
| New | +$2.1M |
|
|
CBI
80
DELISTED
Chicago Bridge & Iron Nv
CBI
| $2.09M | 0.24% |
+42,460
| New | +$1.79M |
|
81
W.W. Grainger
GWW
$64.7B
| $2.06M | 0.24% |
8,729
+8,253
| +1,734% | +$1.97M |
|
82
HCA Healthcare
HCA
$82.2B
| $2.03M | 0.24% |
+26,933
| New | +$1.93M |
|
|
WLL
83
DELISTED
Whiting Petroleum Corporation
WLL
| $2.03M | 0.24% |
219
-30
| -12% | -$304K |
|
|
84
PUT
Gilead Sciences
GILD
$165B
| $1.97M | 0.23% |
5,879
-1,965
| -25% | -$200K |
|
|
85
CALL
Alibaba
BABA
$283B
| $1.96M | 0.23% |
9,222
+1,089
| +13% | +$98.3K |
|
|
TIF
86
DELISTED
Tiffany & Co.
TIF
| $1.95M | 0.23% |
22,125
+14,920
| +207% | +$1.33M |
|
|
GMCR
87
DELISTED
KEURIG GREEN MTN INC
GMCR
| $1.94M | 0.23% |
17,346
+10,101
| +139% | +$1.26M |
|
|
HSP
88
DELISTED
HOSPIRA INC
HSP
| $1.9M | 0.22% |
21,626
+20,995
| +3,327% | +$1.65M |
|
|
89
Baidu
BIDU
$36.8B
| $1.87M | 0.22% |
8,997
-61,931
| -87% | -$13.3M |
|
90
3M
MMM
$89.1B
| $1.85M | 0.22% |
+13,449
| New | +$1.85M |
|
|
91
CALL
Gilead Sciences
GILD
$165B
| $1.84M | 0.21% |
6,737
-157
| -2% | -$15.9K |
|
92
PUT
Caterpillar
CAT
$410B
| $1.83M | 0.21% |
2,173
+891
| +70% | +$74K |
|
93
PepsiCo
PEP
$184B
| $1.82M | 0.21% |
+19,018
| New | +$1.84M |
|
94
PUT
Transocean
RIG
$5.8B
| $1.81M | 0.21% |
+2,103
| New | +$34.1K |
|
95
PUT
Meta Platforms (Facebook)
META
$1.63T
| $1.78M | 0.21% |
4,717
+2,309
| +96% | +$181K |
|
96
Walt Disney
DIS
$167B
| $1.78M | 0.21% |
+16,969
| New | +$1.71M |
|
|
CBI
97
PUT
DELISTED
Chicago Bridge & Iron Nv
CBI
| $1.77M | 0.21% |
1,333
+756
| +131% | +$31.8K |
|
98
Public Storage
PSA
$55.4B
| $1.73M | 0.2% |
8,758
+7,337
| +516% | +$1.45M |
|
|
SNDK
99
PUT
DELISTED
SANDISK CORP
SNDK
| $1.73M | 0.2% |
1,306
+589
| +82% | +$47.9K |
|
100
Yelp
YELP
$1.45B
| $1.72M | 0.2% |
36,405
-3,955
| -10% | -$196K |
|
Similar funds
Simplex Trading's Q1 2015 Portfolio in Review
As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.
By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
- Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
- Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
- Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
- Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
- Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
- Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.
Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.