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 | |
|---|---|---|---|---|---|---|
|
AY
4626
DELISTED
Atlantica Sustainable Infrastructure plc Ordinary Shares
AY
| $216K | ﹤0.01% |
5,899
-2,679
| -31% | -$105K |
|
|
CGRO
4627
DELISTED
Collective Growth Corporation Class A Common Stock
CGRO
| $216K | ﹤0.01% |
21,704
-11,997
| -36% | -$150K |
|
|
BDN
4628
CALL
Brandywine Realty Trust
BDN
$525M
| $215K | ﹤0.01% |
167
-455
| -73% | -$5.56K |
|
4629
CALL
Compugen
CGEN
$220M
| $215K | ﹤0.01% |
251
-115
| -31% | -$1.27K |
|
4630
CALL
Caesarstone
CSTE
$71.6M
| $215K | ﹤0.01% |
157
+127
| +423% | +$1.68K |
|
4631
8x8 Inc
EGHT
$262M
| $215K | ﹤0.01% |
6,636
-9,827
| -60% | -$340K |
|
|
NS
4632
PUT
DELISTED
NuStar Energy L.P.
NS
| $215K | ﹤0.01% |
126
+84
| +200% | +$1.43K |
|
|
HEP
4633
CALL
DELISTED
Holly Energy Partners, L.P.
HEP
| $215K | ﹤0.01% |
113
-255
| -69% | -$4.2K |
|
|
NTUS
4634
PUT
DELISTED
Natus Medical Inc
NTUS
| $215K | ﹤0.01% |
84
+72
| +600% | +$1.85K |
|
|
WRI
4635
CALL
DELISTED
Weingarten Realty Investors
WRI
| $215K | ﹤0.01% |
80
+43
| +116% | +$1.06K |
|
4636
PUT
Evergy
EVRG
$19.2B
| $214K | ﹤0.01% |
36
-92
| -72% | -$5.09K |
|
4637
CALL
East-West Bancorp
EWBC
$17.9B
| $214K | ﹤0.01% |
29
+6
| +26% | +$408 |
|
4638
Dorian LPG
LPG
$1.98B
| $214K | ﹤0.01% |
16,350
+15,113
| +1,222% | +$201K |
|
4639
Vistra
VST
$50.1B
| $214K | ﹤0.01% |
12,155
-169
| -1% | -$3.36K |
|
4640
YPF
YPF
$20.4B
| $214K | ﹤0.01% |
+52,219
| New | +$221K |
|
4641
CALL
Energizer
ENR
$1.44B
| $213K | ﹤0.01% |
45
-227
| -83% | -$10.4K |
|
|
HOUS
4642
DELISTED
Anywhere Real Estate
HOUS
| $213K | ﹤0.01% |
+14,094
| New | +$224K |
|
4643
CALL
NewtekOne
NEWT
$423M
| $213K | ﹤0.01% |
80
-169
| -68% | -$3.86K |
|
4644
CALL
Natera
NTRA
$38.6B
| $213K | ﹤0.01% |
21
-98
| -82% | -$10.7K |
|
|
OLP
4645
PUT
One Liberty Properties
OLP
$532M
| $213K | ﹤0.01% |
96
+44
| +85% | +$948 |
|
4646
PUT
Telus
TU
$16.8B
| $213K | ﹤0.01% |
+107
| New | +$2.22K |
|
|
MSP
4647
PUT
DELISTED
Datto Holding Corp.
MSP
| $213K | ﹤0.01% |
93
+83
| +830% | +$2.08K |
|
4648
CALL
Broadstone Net Lease
BNL
$4.12B
| $212K | ﹤0.01% |
+116
| New | +$2.14K |
|
4649
CALL
Fossil Group
FOSL
$288M
| $212K | ﹤0.01% |
171
+7
| +4% | +$98 |
|
4650
NOV
NOV
$6.93B
| $212K | ﹤0.01% |
15,492
-1,307
| -8% | -$19K |
|
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.