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 | |
|---|---|---|---|---|---|---|
1826
CALL
AudioCodes
AUDC
$244M
| $1.67M | ﹤0.01% |
619
+555
| +867% | +$16.5K |
|
1827
PUT
nCino
NCNO
$1.81B
| $1.67M | ﹤0.01% |
250
+192
| +331% | +$13.7K |
|
1828
Vishay Intertechnology
VSH
$5.86B
| $1.67M | ﹤0.01% |
69,299
+50,517
| +269% | +$1.18M |
|
1829
CALL
IPG Photonics
IPGP
$3.89B
| $1.67M | ﹤0.01% |
79
+14
| +22% | +$3.18K |
|
1830
CALL
Rambus
RMBS
$10.4B
| $1.66M | ﹤0.01% |
856
-351
| -29% | -$7.05K |
|
1831
CALL
Hyatt Hotels
H
$17.6B
| $1.66M | ﹤0.01% |
201
+153
| +319% | +$12K |
|
1832
CALL
Royalty Pharma
RPRX
$26.1B
| $1.66M | ﹤0.01% |
381
+232
| +156% | +$11K |
|
|
FCAC
1833
PUT
DELISTED
Falcon Capital Acquisition Corp. Class A Common Stock
FCAC
| $1.66M | ﹤0.01% |
+1,666
| New | +$18.2K |
|
|
BZUN
1834
CALL
Baozun
BZUN
$144M
| $1.66M | ﹤0.01% |
435
-446
| -51% | -$19K |
|
1835
Lennar Class A
LEN
$20.4B
| $1.66M | ﹤0.01% |
16,924
+361
| +2% | +$30.4K |
|
1836
PUT
Universal Display
OLED
$3.71B
| $1.66M | ﹤0.01% |
70
-170
| -71% | -$39.3K |
|
1837
PUT
Papa John's
PZZA
$999M
| $1.66M | ﹤0.01% |
187
-163
| -47% | -$15.4K |
|
|
SLAI
1838
PUT
DELISTED
SOLAI Ltd ADS
SLAI
| $1.66M | ﹤0.01% |
11
+8
| +267% | +$10.1K |
|
1839
PUT
Entegris
ENTG
$19.7B
| $1.65M | ﹤0.01% |
148
+143
| +2,860% | +$14.7K |
|
1840
CALL
Amkor Technology
AMKR
$16.1B
| $1.65M | ﹤0.01% |
696
+529
| +317% | +$10.8K |
|
1841
CALL
Ameriprise Financial
AMP
$46.8B
| $1.65M | ﹤0.01% |
71
+23
| +48% | +$4.97K |
|
|
PVG
1842
CALL
DELISTED
PRETIUM RESOURCES INC.
PVG
| $1.65M | ﹤0.01% |
1,591
-923
| -37% | -$9.88K |
|
1843
CALL
EVgo
EVGO
$200M
| $1.64M | ﹤0.01% |
+1,200
| New | +$18.4K |
|
1844
CALL
Root
ROOT
$917M
| $1.64M | ﹤0.01% |
72
+56
| +350% | +$16.9K |
|
1845
PUT
Qfin Holdings
QFIN
$1.61B
| $1.64M | ﹤0.01% |
630
+585
| +1,300% | +$13K |
|
|
NOVA
1846
PUT
DELISTED
Sunnova Energy
NOVA
| $1.63M | ﹤0.01% |
400
+358
| +852% | +$15.9K |
|
1847
Direxion Daily Regional Banks Bull 3X ETF
DPST
$451M
| $1.63M | ﹤0.01% |
3,520
+1,973
| +128% | +$797K |
|
1848
CALL
Hewlett Packard
HPE
$63.2B
| $1.63M | ﹤0.01% |
1,036
-1,391
| -57% | -$19.3K |
|
1849
CALL
Chefs' Warehouse
CHEF
$3.87B
| $1.63M | ﹤0.01% |
535
+314
| +142% | +$9.32K |
|
|
TRVG
1850
PUT
trivago
TRVG
$386M
| $1.62M | ﹤0.01% |
756
+717
| +1,838% | +$12.1K |
|
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.