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 | |
|---|---|---|---|---|---|---|
1876
CALL
Flex
FLEX
$43.4B
| $1.26M | ﹤0.01% |
1,331
+37
| +3% | +$319 |
|
1877
PUT
Bank OZK
OZK
$5.49B
| $1.26M | ﹤0.01% |
415
+276
| +199% | +$8.1K |
|
|
CLR
1878
PUT
DELISTED
CONTINENTAL RESOURCES INC.
CLR
| $1.26M | ﹤0.01% |
369
-63
| -15% | -$1.96K |
|
1879
CALL
Atmos Energy
ATO
$29.9B
| $1.26M | ﹤0.01% |
113
+72
| +176% | +$7.9K |
|
1880
ON Semiconductor
ON
$33.8B
| $1.26M | ﹤0.01% |
51,794
+10,707
| +26% | +$226K |
|
|
ZAYO
1881
CALL
DELISTED
Zayo Group Holdings, Inc.
ZAYO
| $1.26M | ﹤0.01% |
364
-4
| -1% | -$137 |
|
1882
CALL
OSI Systems
OSIS
$3.57B
| $1.26M | ﹤0.01% |
125
-67
| -35% | -$6.62K |
|
1883
PUT
Trex
TREX
$4.51B
| $1.26M | ﹤0.01% |
280
-496
| -64% | -$21.8K |
|
|
BPMC
1884
PUT
DELISTED
Blueprint Medicines
BPMC
| $1.26M | ﹤0.01% |
157
+109
| +227% | +$8.16K |
|
1885
CALL
Corcept Therapeutics
CORT
$10.2B
| $1.26M | ﹤0.01% |
1,039
+853
| +459% | +$11.9K |
|
1886
PUT
Brighthouse Financial
BHF
$3.63B
| $1.25M | ﹤0.01% |
320
+122
| +62% | +$4.8K |
|
1887
CALL
Federal Agricultural Mortgage Class A
AGM.A
| $1.25M | ﹤0.01% |
150
+143
| +2,043% | +$10.4K |
|
|
MNK
1888
CALL
DELISTED
MALLINCKRODT PUBLIC LIMITED COMPANY
MNK
| $1.25M | ﹤0.01% |
3,586
+247
| +7% | +$771 |
|
1889
PUT
Radware
RDWR
$1.24B
| $1.25M | ﹤0.01% |
485
+193
| +66% | +$4.57K |
|
1890
PUT
Suncor Energy
SU
$77.7B
| $1.25M | ﹤0.01% |
381
-144
| -27% | -$4.49K |
|
|
PBFX
1891
PUT
DELISTED
PBF LOGISTICS LP
PBFX
| $1.25M | ﹤0.01% |
617
-217
| -26% | -$4.53K |
|
|
CMA
1892
CALL
DELISTED
Comerica
CMA
| $1.25M | ﹤0.01% |
174
+67
| +63% | +$4.6K |
|
|
ROCC
1893
PUT
DELISTED
Ranger Oil Corporation Class A Common Stock
ROCC
| $1.25M | ﹤0.01% |
411
+233
| +131% | +$6.2K |
|
1894
F5
FFIV
$22.1B
| $1.25M | ﹤0.01% |
+8,926
| New | +$1.26M |
|
1895
CALL
Old National Bancorp
ONB
$10.1B
| $1.25M | ﹤0.01% |
681
-481
| -41% | -$8.64K |
|
1896
CALL
ALPS REIT Dividend Dogs ETF
RDOG
$11.6M
| $1.25M | ﹤0.01% |
1,426
+1,384
| +3,295% | +$66.9K |
|
1897
CALL
Baker Hughes
BKR
$56.8B
| $1.24M | ﹤0.01% |
485
-502
| -51% | -$11.4K |
|
1898
CALL
Plains All American Pipeline
PAA
$17.4B
| $1.24M | ﹤0.01% |
676
+316
| +88% | +$5.81K |
|
1899
Williams-Sonoma
WSM
$26.7B
| $1.24M | ﹤0.01% |
33,854
+25,222
| +292% | +$876K |
|
1900
CALL
BOK Financial
BOKF
$8.64B
| $1.24M | ﹤0.01% |
142
+119
| +517% | +$9.7K |
|
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.