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 |
Apple
AAPL
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.75% |
| 2 | Consumer Discretionary | 0.58% |
| 3 | Communication Services | 0.33% |
| 4 | Healthcare | 0.31% |
| 5 | Industrials | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2001
CALL
Cheesecake Factory
CAKE
$4.21B
| $1.11M | ﹤0.01% |
285
+74
| +35% | +$3.05K |
|
2002
PUT
Teradyne
TER
$54.8B
| $1.1M | ﹤0.01% |
162
-325
| -67% | -$20.6K |
|
2003
PUT
W.P. Carey
WPC
$17.1B
| $1.1M | ﹤0.01% |
141
-6
| -4% | -$503 |
|
|
PRAH
2004
PUT
DELISTED
PRA Health Sciences, Inc.
PRAH
| $1.1M | ﹤0.01% |
99
-139
| -58% | -$14.3K |
|
2005
J.M. Smucker
SJM
$12.6B
| $1.1M | ﹤0.01% |
10,558
+7,334
| +227% | +$776K |
|
2006
PUT
Karyopharm Therapeutics
KPTI
$168M
| $1.1M | ﹤0.01% |
38
+27
| +245% | +$5.86K |
|
2007
Target
TGT
$62.1B
| $1.1M | ﹤0.01% |
8,567
-9,117
| -52% | -$1.07M |
|
2008
Carlyle Group
CG
$16.3B
| $1.1M | ﹤0.01% |
+34,204
| New | +$967K |
|
|
TMX
2009
CALL
DELISTED
Terminix Global Holdings, Inc.
TMX
| $1.1M | ﹤0.01% |
284
+172
| +154% | +$7.31K |
|
2010
CALL
MDU Resources
MDU
$4.44B
| $1.1M | ﹤0.01% |
970
+299
| +45% | +$3.26K |
|
2011
PUT
Omega Healthcare
OHI
$15.4B
| $1.1M | ﹤0.01% |
259
+1
| +0.4% | +$42 |
|
2012
Deere & Co
DE
$170B
| $1.09M | ﹤0.01% |
6,316
-19,181
| -75% | -$3.3M |
|
2013
Innoviva
INVA
$1.58B
| $1.09M | ﹤0.01% |
+77,323
| New | +$949K |
|
2014
PUT
BorgWarner
BWA
$13.2B
| $1.09M | ﹤0.01% |
286
-498
| -64% | -$18.3K |
|
2015
CALL
Lands' End
LE
$361M
| $1.09M | ﹤0.01% |
651
+436
| +203% | +$5.71K |
|
2016
CALL
Steel Dynamics
STLD
$35.6B
| $1.09M | ﹤0.01% |
321
-60
| -16% | -$1.92K |
|
2017
CALL
Yeti Holdings
YETI
$3.82B
| $1.09M | ﹤0.01% |
314
-25
| -7% | -$788 |
|
|
SWCH
2018
CALL
DELISTED
Switch, Inc. Class A Common Stock
SWCH
| $1.09M | ﹤0.01% |
737
+341
| +86% | +$5.17K |
|
|
SMAR
2019
CALL
DELISTED
Smartsheet Inc.
SMAR
| $1.09M | ﹤0.01% |
243
-224
| -48% | -$9.26K |
|
2020
CALL
Entergy
ETR
$54.1B
| $1.09M | ﹤0.01% |
182
-42
| -19% | -$2.47K |
|
|
S
2021
CALL
DELISTED
Sprint Corporation
S
| $1.09M | ﹤0.01% |
2,090
-1,807
| -46% | -$10.6K |
|
2022
State Street SPDR S&P Homebuilders ETF
XHB
$1.74B
| $1.09M | ﹤0.01% |
+23,886
| New | +$1.08M |
|
2023
CALL
Fair Isaac
FICO
$28.7B
| $1.09M | ﹤0.01% |
29
-7
| -19% | -$2.35K |
|
2024
Bilibili
BILI
$7.18B
| $1.08M | ﹤0.01% |
58,287
+27,247
| +88% | +$442K |
|
2025
WEC Energy
WEC
$37.7B
| $1.08M | ﹤0.01% |
11,752
-24,428
| -68% | -$2.23M |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Technology at 0.75% of assets, up from 0.48% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.