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 | |
|---|---|---|---|---|---|---|
5026
CALL
RLI Corp
RLI
$5.62B
| $167K | ﹤0.01% |
+30
| New | +$1.59K |
|
5027
Vanguard FTSE Pacific ETF
VPL
$8.08B
| $167K | ﹤0.01% |
+2,046
| New | +$168K |
|
5028
PUT
Artisan Partners
APAM
$2.79B
| $166K | ﹤0.01% |
32
-11
| -26% | -$561 |
|
|
APLT
5029
DELISTED
Applied Therapeutics
APLT
| $166K | ﹤0.01% |
8,865
-27,457
| -76% | -$592K |
|
5030
CALL
Alliance Resource Partners
ARLP
$3.34B
| $166K | ﹤0.01% |
287
-216
| -43% | -$1.24K |
|
5031
PUT
Precision BioSciences
DTIL
$180M
| $166K | ﹤0.01% |
+5
| New | +$1.75K |
|
5032
Douglas Dynamics
PLOW
$1.02B
| $166K | ﹤0.01% |
3,609
+2,752
| +321% | +$127K |
|
5033
CALL
Vericel Corp
VCEL
$2.35B
| $166K | ﹤0.01% |
30
+16
| +114% | +$724 |
|
5034
Zedge
ZDGE
$38.6M
| $166K | ﹤0.01% |
13,765
+11,411
| +485% | +$116K |
|
|
ATSG
5035
DELISTED
Air Transport Services Group
ATSG
| $166K | ﹤0.01% |
5,678
+3,714
| +189% | +$105K |
|
|
CVA
5036
CALL
DELISTED
Covanta Holding Corporation
CVA
| $166K | ﹤0.01% |
120
-13
| -10% | -$186 |
|
5037
PUT
1-800-Flowers.com
FLWS
$250M
| $165K | ﹤0.01% |
60
+29
| +94% | +$862 |
|
5038
PUT
iHeartMedia
IHRT
$543M
| $165K | ﹤0.01% |
91
-31
| -25% | -$468 |
|
5039
NGL Energy Partners
NGL
$2.05B
| $165K | ﹤0.01% |
80,968
+33,756
| +71% | +$86.5K |
|
5040
PUT
Sun Communities
SUI
$15.2B
| $165K | ﹤0.01% |
11
+8
| +267% | +$1.18K |
|
5041
CALL
Teledyne Technologies
TDY
$30.4B
| $165K | ﹤0.01% |
4
+2
| +100% | +$772 |
|
|
EMAN
5042
DELISTED
eMagin Corporation
EMAN
| $165K | ﹤0.01% |
44,318
+23,288
| +111% | +$78.5K |
|
5043
PUT
Korea Electric Power
KEP
$15.3B
| $164K | ﹤0.01% |
160
+149
| +1,355% | +$1.61K |
|
5044
PUT
Mercury Insurance
MCY
$5.93B
| $164K | ﹤0.01% |
27
-11
| -29% | -$629 |
|
5045
Comscore
SCOR
$106M
| $164K | ﹤0.01% |
2,247
+1,526
| +212% | +$108K |
|
5046
CALL
Wipro
WIT
$19.6B
| $164K | ﹤0.01% |
518
+280
| +118% | +$899 |
|
|
VNE
5047
CALL
DELISTED
Veoneer, Inc.
VNE
| $164K | ﹤0.01% |
67
-38
| -36% | -$992 |
|
|
IACA
5048
PUT
DELISTED
ION Acquisition Corp 1 Ltd.
IACA
| $164K | ﹤0.01% |
+163
| New | +$1.93K |
|
5049
Newmark Group
NMRK
$2.66B
| $163K | ﹤0.01% |
16,370
-31,113
| -66% | -$279K |
|
5050
CALL
Syndax Pharmaceuticals
SNDX
$1.69B
| $163K | ﹤0.01% |
73
+69
| +1,725% | +$1.56K |
|
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.