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 | |
|---|---|---|---|---|---|---|
1901
PUT
Malibu Boats
MBUU
$544M
| $1.24M | ﹤0.01% |
303
+268
| +766% | +$9.69K |
|
1902
CALL
SS&C Technologies
SSNC
$17.8B
| $1.24M | ﹤0.01% |
202
-1,914
| -90% | -$107K |
|
1903
CALL
MSC Industrial Direct
MSM
$7.02B
| $1.24M | ﹤0.01% |
158
+89
| +129% | +$6.57K |
|
|
KYNB
1904
CALL
Kyntra Bio
KYNB
$28.5M
| $1.24M | ﹤0.01% |
12
+8
| +200% | +$8.17K |
|
1905
McDonald's
MCD
$188B
| $1.23M | ﹤0.01% |
+6,236
| New | +$1.24M |
|
1906
CALL
Planet Fitness
PLNT
$4.23B
| $1.23M | ﹤0.01% |
165
-330
| -67% | -$22.2K |
|
1907
CALL
Crocs
CROX
$6.69B
| $1.23M | ﹤0.01% |
294
+183
| +165% | +$6.39K |
|
1908
PUT
WPP
WPP
$4.04B
| $1.23M | ﹤0.01% |
175
-20
| -10% | -$1.27K |
|
1909
CALL
Kinross Gold
KGC
$28.5B
| $1.23M | ﹤0.01% |
2,593
+1,747
| +207% | +$7.88K |
|
|
WUBA
1910
PUT
DELISTED
58.com Inc
WUBA
| $1.23M | ﹤0.01% |
190
+105
| +124% | +$5.91K |
|
1911
NCR Voyix
VYX
$1.06B
| $1.23M | ﹤0.01% |
56,820
+8,960
| +19% | +$174K |
|
|
MRTX
1912
PUT
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $1.22M | ﹤0.01% |
95
+31
| +48% | +$2.99K |
|
1913
DuPont de Nemours
DD
$18.6B
| $1.22M | ﹤0.01% |
15,169
+13,895
| +1,091% | +$1.15M |
|
1914
Jacobs Solutions
J
$15.9B
| $1.22M | ﹤0.01% |
+16,455
| New | +$1.25M |
|
1915
CALL
M&T Bank
MTB
$36.2B
| $1.22M | ﹤0.01% |
72
-252
| -78% | -$40.9K |
|
1916
CALL
Huntington Bancshares
HBAN
$35.1B
| $1.22M | ﹤0.01% |
810
+517
| +176% | +$7.58K |
|
1917
CALL
BCE
BCE
$19.9B
| $1.21M | ﹤0.01% |
262
-129
| -33% | -$6.18K |
|
|
GES
1918
CALL
DELISTED
Guess Inc
GES
| $1.21M | ﹤0.01% |
542
+356
| +191% | +$6.63K |
|
1919
CALL
Dover
DOV
$27.2B
| $1.21M | ﹤0.01% |
105
+71
| +209% | +$7.61K |
|
1920
Lands' End
LE
$361M
| $1.21M | ﹤0.01% |
72,008
+35,270
| +96% | +$461K |
|
1921
CALL
Vermilion Energy
VET
$1.73B
| $1.21M | ﹤0.01% |
739
+133
| +22% | +$2K |
|
1922
CALL
Abercrombie & Fitch
ANF
$4.17B
| $1.21M | ﹤0.01% |
698
+428
| +159% | +$7.08K |
|
|
1923
PUT
M&T Bank
MTB
$36.2B
| $1.21M | ﹤0.01% |
71
+1
| +1% | +$162 |
|
|
FG
1924
DELISTED
FGL Holdings Ordinary Shares
FG
| $1.21M | ﹤0.01% |
+113,221
| New | +$1.03M |
|
1925
CALL
Amplify Junior Silver Miners ETF
SILJ
$3.27B
| $1.2M | ﹤0.01% |
525
-245
| -32% | -$2.57K |
|
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.