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 | |
|---|---|---|---|---|---|---|
1976
Linde
LIN
$237B
| $1.14M | ﹤0.01% |
+5,361
| New | +$1.08M |
|
1977
CALL
Ecolab
ECL
$75.6B
| $1.14M | ﹤0.01% |
59
+18
| +44% | +$3.42K |
|
|
MASI
1978
PUT
DELISTED
Masimo
MASI
| $1.14M | ﹤0.01% |
72
+47
| +188% | +$7.07K |
|
1979
PUT
Old Dominion Freight Line
ODFL
$48.5B
| $1.14M | ﹤0.01% |
180
-1,035
| -85% | -$63.5K |
|
1980
CALL
National Beverage
FIZZ
$2.87B
| $1.14M | ﹤0.01% |
446
-54
| -11% | -$1.3K |
|
1981
CALL
Welltower
WELL
$178B
| $1.14M | ﹤0.01% |
139
-206
| -60% | -$17.6K |
|
|
AXNX
1982
CALL
DELISTED
Axonics, Inc. Common Stock
AXNX
| $1.13M | ﹤0.01% |
408
+403
| +8,060% | +$9.62K |
|
|
BOLD
1983
CALL
DELISTED
Audentes Therapeutics, Inc
BOLD
| $1.13M | ﹤0.01% |
189
+187
| +9,350% | +$7.02K |
|
1984
Coeur Mining
CDE
$15.6B
| $1.13M | ﹤0.01% |
139,338
+58,567
| +73% | +$361K |
|
1985
CALL
Cooper Companies
COO
$13.7B
| $1.12M | ﹤0.01% |
140
-212
| -60% | -$16K |
|
1986
Dollar General
DG
$25.9B
| $1.12M | ﹤0.01% |
7,212
-363
| -5% | -$57.6K |
|
1987
CALL
Flowserve
FLS
$9.25B
| $1.12M | ﹤0.01% |
226
-8
| -3% | -$383 |
|
1988
CALL
Winnebago Industries
WGO
$870M
| $1.12M | ﹤0.01% |
212
+168
| +382% | +$7.86K |
|
1989
CALL
Sysco
SYY
$39.7B
| $1.12M | ﹤0.01% |
131
-377
| -74% | -$30.5K |
|
|
VRNT
1990
DELISTED
Verint Systems
VRNT
| $1.12M | ﹤0.01% |
+39,719
| New | +$968K |
|
1991
Ralph Lauren
RL
$22.2B
| $1.12M | ﹤0.01% |
9,550
-5,693
| -37% | -$600K |
|
1992
PUT
Stepan Co
SCL
$1.31B
| $1.12M | ﹤0.01% |
109
+106
| +3,533% | +$10.3K |
|
1993
PUT
Watsco Inc
WSO
$14.9B
| $1.12M | ﹤0.01% |
+62
| New | +$10.9K |
|
1994
Extreme Networks
EXTR
$3.86B
| $1.11M | ﹤0.01% |
+151,380
| New | +$1.06M |
|
1995
PUT
AnaptysBio
ANAB
$1.6B
| $1.11M | ﹤0.01% |
686
+683
| +22,767% | +$16.2K |
|
|
LGF.B
1996
PUT
DELISTED
Lions Gate Entertainment Corp. Class B Non-Voting Shares
LGF.B
| $1.11M | ﹤0.01% |
1,047
+115
| +12% | +$992 |
|
|
FLXN
1997
DELISTED
Flexion Therapeutics, Inc.
FLXN
| $1.11M | ﹤0.01% |
53,745
+48,176
| +865% | +$812K |
|
1998
Check Point Software Technologies
CHKP
$13.3B
| $1.11M | ﹤0.01% |
10,007
-2,821
| -22% | -$317K |
|
|
CTLT
1999
CALL
DELISTED
CATALENT, INC.
CTLT
| $1.11M | ﹤0.01% |
197
-175
| -47% | -$8.92K |
|
|
ATCO
2000
DELISTED
Atlas Corp.
ATCO
| $1.11M | ﹤0.01% |
78,003
+71,909
| +1,180% | +$858K |
|
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.