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 |
iShares Russell 2000 ETF
IWM
|
+$67.5M |
| 2 |
Palantir
PLTR
|
+$64.7M |
| 3 |
PARA
Paramount Global Class B
PARA
|
+$31.5M |
| 4 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$30.7M |
| 5 |
Carnival Corporation Ltd
CCL
|
+$25.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
Tesla
TSLA
|
+$53.7M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$38.1M |
| 4 |
Invesco QQQ Trust
QQQ
|
+$37.6M |
| 5 |
AutoZone
AZO
|
+$28.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.65% |
| 2 | Consumer Discretionary | 0.49% |
| 3 | Healthcare | 0.32% |
| 4 | Financials | 0.3% |
| 5 | Industrials | 0.29% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1901
PUT
LKQ Corp
LKQ
$6.58B
| $1.55M | ﹤0.01% |
367
+25
| +7% | +$983 |
|
1902
Virgin Galactic
SPCE
$320M
| $1.55M | ﹤0.01% |
2,534
+2,212
| +687% | +$1.67M |
|
|
LVOX
1903
CALL
DELISTED
LiveVox Holding, Inc. Class A Common Stock
LVOX
| $1.55M | ﹤0.01% |
+1,542
| New | +$15.9K |
|
1904
PUT
VeriSign
VRSN
$25.3B
| $1.55M | ﹤0.01% |
78
-206
| -73% | -$40.5K |
|
|
FRC
1905
PUT
DELISTED
First Republic Bank
FRC
| $1.55M | ﹤0.01% |
93
-101
| -52% | -$16.4K |
|
1906
MP Materials
MP
$7.35B
| $1.55M | ﹤0.01% |
+43,038
| New | +$1.59M |
|
1907
PUT
Banco Santander
SAN
$194B
| $1.54M | ﹤0.01% |
+4,502
| New | +$15.3K |
|
1908
KB Home
KBH
$3.48B
| $1.54M | ﹤0.01% |
+33,132
| New | +$1.37M |
|
1909
PUT
Hecla Mining
HL
$10.2B
| $1.54M | ﹤0.01% |
2,707
+381
| +16% | +$2.33K |
|
|
CYBR
1910
PUT
DELISTED
CyberArk
CYBR
| $1.54M | ﹤0.01% |
119
-193
| -62% | -$29.2K |
|
1911
PUT
Regions Financial
RF
$26.3B
| $1.54M | ﹤0.01% |
745
-721
| -49% | -$14.1K |
|
1912
PUT
Aecom
ACM
$9.07B
| $1.54M | ﹤0.01% |
240
-133
| -36% | -$7.57K |
|
1913
PUT
Alarm.com
ALRM
$2.56B
| $1.54M | ﹤0.01% |
178
+103
| +137% | +$9.71K |
|
1914
CALL
Range Resources
RRC
$9.11B
| $1.53M | ﹤0.01% |
1,486
-237
| -14% | -$2.3K |
|
|
IPFF
1915
CALL
DELISTED
iShares International Preferred Stock ETF
IPFF
| $1.53M | ﹤0.01% |
1,283
-68
| -5% | -$1.1K |
|
1916
PUT
National Vision
EYE
$1.6B
| $1.53M | ﹤0.01% |
349
+156
| +81% | +$7.43K |
|
|
FOLD
1917
DELISTED
Amicus Therapeutics
FOLD
| $1.53M | ﹤0.01% |
154,777
+113,246
| +273% | +$1.75M |
|
1918
CALL
Brunswick
BC
$5.19B
| $1.52M | ﹤0.01% |
160
-55
| -26% | -$5.04K |
|
|
LTCH
1919
CALL
DELISTED
Latch, Inc. Common Stock
LTCH
| $1.52M | ﹤0.01% |
+1,405
| New | +$18.3K |
|
|
SPCK
1920
The SPAC and New Issue ETF
SPCK
$8.3M
| $1.52M | ﹤0.01% |
+53,448
| New | +$1.58M |
|
1921
CALL
Dycom Industries
DY
$12.9B
| $1.52M | ﹤0.01% |
164
-11
| -6% | -$954 |
|
1922
CALL
Thor Industries
THO
$3.99B
| $1.52M | ﹤0.01% |
113
-39
| -26% | -$4.73K |
|
1923
PUT
AXIS Capital
AXS
$8.59B
| $1.52M | ﹤0.01% |
307
+280
| +1,037% | +$14K |
|
1924
CALL
OptimizeRx
OPRX
$117M
| $1.52M | ﹤0.01% |
312
+295
| +1,735% | +$14.2K |
|
1925
Roundhill Sports Betting & iGaming ETF
BETZ
$49.7M
| $1.52M | ﹤0.01% |
49,385
-25,224
| -34% | -$763K |
|
Similar funds
Simplex Trading's Q1 2021 Portfolio in Review
As of Q1 2021, Simplex Trading held 10,706 positions worth $55.7B, down 28% from $77.2B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading withdrew a net $23.5B in Q1 2021, closing 1,706 positions and reducing 3,151 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $38.1M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.65% of assets, up from 0.37% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Pfizer worth $16.8M.
- Simplex Trading's largest Q1 2021 buy was Pfizer: 464,628 shares worth $16.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q1 2021, an estimated $67.5M increase.
- Simplex Trading's biggest Q1 2021 reduction was Amazon, cutting an estimated $66M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2021, selling an estimated $38.1M.
- Simplex Trading's ten largest holdings make up 43% of its $55.7B portfolio in Q1 2021.
- Simplex Trading opened 2,258 new positions and closed 1,706 in Q1 2021.
- Simplex Trading's portfolio value fell 28% quarter-over-quarter to $55.7B.
Based on Simplex Trading's 13F filing for Q1 2021, filed 26 Apr 2021.