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 | |
|---|---|---|---|---|---|---|
1926
CALL
PPG Industries
PPG
$25.9B
| $1.2M | ﹤0.01% |
90
-104
| -54% | -$13.2K |
|
|
WMGI
1927
DELISTED
Wright Medical Group Inc
WMGI
| $1.2M | ﹤0.01% |
39,377
+33,650
| +588% | +$881K |
|
1928
CALL
Angi Inc
ANGI
$224M
| $1.2M | ﹤0.01% |
141
+125
| +781% | +$9.34K |
|
1929
GrafTech
EAF
$194M
| $1.2M | ﹤0.01% |
+10,290
| New | +$1.29M |
|
1930
PUT
Royal Bank of Canada
RY
$291B
| $1.2M | ﹤0.01% |
151
+9
| +6% | +$725 |
|
1931
PUT
Regenxbio
RGNX
$623M
| $1.19M | ﹤0.01% |
291
+255
| +708% | +$10.1K |
|
1932
PUT
Tandem Diabetes Care
TNDM
$1.17B
| $1.19M | ﹤0.01% |
200
-100
| -33% | -$6.17K |
|
1933
PUT
Fortive
FTV
$19B
| $1.19M | ﹤0.01% |
247
-16
| -6% | -$723 |
|
|
ATSG
1934
PUT
DELISTED
Air Transport Services Group
ATSG
| $1.19M | ﹤0.01% |
508
-118
| -19% | -$2.65K |
|
1935
CALL
Pinterest
PINS
$12.4B
| $1.19M | ﹤0.01% |
638
-507
| -44% | -$10.9K |
|
1936
PUT
Cal-Maine
CALM
$4.28B
| $1.19M | ﹤0.01% |
278
-30
| -10% | -$1.25K |
|
1937
PVH
PVH
$3.71B
| $1.19M | ﹤0.01% |
11,287
-4,303
| -28% | -$411K |
|
1938
SAP
SAP
$187B
| $1.18M | ﹤0.01% |
8,837
-11,370
| -56% | -$1.49M |
|
1939
Zebra Technologies
ZBRA
$12.4B
| $1.18M | ﹤0.01% |
4,639
+208
| +5% | +$48.7K |
|
|
WRK
1940
CALL
DELISTED
WestRock Company
WRK
| $1.18M | ﹤0.01% |
276
+58
| +27% | +$2.26K |
|
1941
Edgewell Personal Care
EPC
$1.27B
| $1.18M | ﹤0.01% |
38,234
-8,785
| -19% | -$284K |
|
|
SAGE
1942
PUT
DELISTED
Sage Therapeutics
SAGE
| $1.18M | ﹤0.01% |
164
-24
| -13% | -$2.95K |
|
1943
PUT
Tapestry
TPR
$28.8B
| $1.18M | ﹤0.01% |
438
-452
| -51% | -$11.8K |
|
1944
PUT
StoneCo
STNE
$2.62B
| $1.18M | ﹤0.01% |
296
+70
| +31% | +$2.56K |
|
|
ARQL
1945
PUT
DELISTED
Arqule Inc
ARQL
| $1.18M | ﹤0.01% |
590
+295
| +100% | +$3.42K |
|
1946
Vulcan Materials
VMC
$36.3B
| $1.18M | ﹤0.01% |
8,165
+7,495
| +1,119% | +$1.07M |
|
1947
WisdomTree India Earnings Fund ETF
EPI
$2.02B
| $1.17M | ﹤0.01% |
47,192
-110
| -0.2% | -$2.67K |
|
1948
CALL
Vipshop
VIPS
$6.84B
| $1.17M | ﹤0.01% |
828
+525
| +173% | +$6.22K |
|
1949
PUT
Nordson
NDSN
$16.5B
| $1.17M | ﹤0.01% |
72
+39
| +118% | +$6.16K |
|
|
PRFT
1950
PUT
DELISTED
Perficient Inc
PRFT
| $1.17M | ﹤0.01% |
254
+230
| +958% | +$9.38K |
|
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.