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 | |
|---|---|---|---|---|---|---|
|
ARUN
1051
CALL
DELISTED
ARUBA NETWORKS, INC.
ARUN
| $109K | 0.01% |
+382
| New | +$7.69K |
|
1052
Akamai
AKAM
$17B
| $108K | 0.01% |
+1,533
| New | +$101K |
|
1053
CALL
Microsoft
MSFT
$2.84T
| $108K | 0.01% |
742
-566
| -43% | -$24.6K |
|
|
ANDV
1054
PUT
DELISTED
Andeavor
ANDV
| $108K | 0.01% |
1,088
-390
| -26% | -$32.7K |
|
|
GLF
1055
DELISTED
GulfMark Offshore, Inc. Common Stock
GLF
| $108K | 0.01% |
8,332
+525
| +7% | +$9.4K |
|
1056
Advance Auto Parts
AAP
$3.23B
| $107K | 0.01% |
721
-291
| -29% | -$44.9K |
|
1057
Dycom Industries
DY
$13.5B
| $107K | 0.01% |
2,197
+1,732
| +372% | +$68.1K |
|
|
WPX
1058
DELISTED
WPX Energy, Inc.
WPX
| $107K | 0.01% |
9,855
+4,350
| +79% | +$49.7K |
|
|
FUEL
1059
PUT
DELISTED
Rocket Fuel Inc.
FUEL
| $107K | 0.01% |
190
+105
| +124% | +$1.27K |
|
|
OKS
1060
DELISTED
Oneok Partners LP
OKS
| $107K | 0.01% |
2,631
-1,169
| -31% | -$48.9K |
|
|
PCL
1061
DELISTED
PLUM CREEK TIMBER CO (REIT)
PCL
| $107K | 0.01% |
2,484
-368
| -13% | -$16K |
|
1062
PUT
Baxter International
BAX
$11.5B
| $106K | 0.01% |
+714
| New | +$27.1K |
|
|
DFS
1063
PUT
DELISTED
Discover Financial Services
DFS
| $106K | 0.01% |
391
+349
| +831% | +$20.7K |
|
1064
Amdocs
DOX
$5.5B
| $106K | 0.01% |
+1,957
| New | +$98.7K |
|
1065
PUT
Intuitive Surgical
ISRG
$120B
| $106K | 0.01% |
414
-1,179
| -74% | -$66.7K |
|
|
TGI
1066
DELISTED
Triumph Group
TGI
| $106K | 0.01% |
1,779
+1,248
| +235% | +$75K |
|
1067
CALL
Workday
WDAY
$32.7B
| $106K | 0.01% |
510
+371
| +267% | +$31.4K |
|
|
CONN
1068
CALL
DELISTED
Conn's Inc.
CONN
| $106K | 0.01% |
257
+158
| +160% | +$3.61K |
|
|
HCR
1069
PUT
DELISTED
Hi-Crush Inc. Common Stock
HCR
| $106K | 0.01% |
51
-62
| -55% | -$2.17K |
|
|
ACHN
1070
DELISTED
Achillion Pharmaceuticals
ACHN
| $106K | 0.01% |
10,832
-5,934
| -35% | -$74.1K |
|
|
GRMN
1071
PUT
Garmin
GRMN
$46.8B
| $105K | 0.01% |
+78
| New | +$3.98K |
|
1072
PUT
PepsiCo
PEP
$184B
| $105K | 0.01% |
654
+391
| +149% | +$37.8K |
|
1073
CALL
Sony
SONY
$123B
| $105K | 0.01% |
990
-525
| -35% | -$2.65K |
|
1074
Willis Towers Watson
WTW
$27.5B
| $105K | 0.01% |
+826
| New | +$101K |
|
|
P
1075
PUT
DELISTED
Pandora Media Inc
P
| $105K | 0.01% |
191
-382
| -67% | -$6.11K |
|
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.