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 | |
|---|---|---|---|---|---|---|
1101
FuboTV Inc
FUBO
$245M
| $3.53M | 0.01% |
13,307
+5,249
| +65% | +$2.25M |
|
1102
PUT
Tootsie Roll Industries
TR
$2.82B
| $3.53M | 0.01% |
1,199
+1,193
| +19,883% | +$32.8K |
|
1103
CALL
Check Point Software Technologies
CHKP
$13.3B
| $3.5M | 0.01% |
313
-22
| -7% | -$2.65K |
|
|
UNVR
1104
CALL
DELISTED
Univar Solutions Inc.
UNVR
| $3.5M | 0.01% |
1,625
+1,588
| +4,292% | +$32.5K |
|
1105
iShares MSCI South Korea ETF
EWY
$21.7B
| $3.5M | 0.01% |
39,000
+19,908
| +104% | +$1.81M |
|
|
NNDM
1106
Nano Dimension
NNDM
$309M
| $3.5M | 0.01% |
407,112
+84,946
| +26% | +$976K |
|
1107
CALL
Alcon
ALC
$33.1B
| $3.49M | 0.01% |
498
+369
| +286% | +$26.1K |
|
|
AZEK
1108
CALL
DELISTED
The AZEK Co
AZEK
| $3.49M | 0.01% |
+831
| New | +$35.6K |
|
|
HZON
1109
PUT
DELISTED
Horizon Acquisition Corporation II
HZON
| $3.49M | 0.01% |
+3,424
| New | +$36.5K |
|
1110
CALL
UWM Holdings
UWMC
$621M
| $3.49M | 0.01% |
4,398
+1,140
| +35% | +$11.1K |
|
1111
PUT
Elanco Animal Health
ELAN
$12.4B
| $3.49M | 0.01% |
1,184
+842
| +246% | +$25.9K |
|
1112
CALL
Goodyear
GT
$2.07B
| $3.48M | 0.01% |
1,982
-167
| -8% | -$2.42K |
|
|
PLAN
1113
CALL
DELISTED
Anaplan, Inc.
PLAN
| $3.48M | 0.01% |
646
+388
| +150% | +$26.2K |
|
1114
US Global Jets ETF
JETS
$802M
| $3.48M | 0.01% |
129,221
-55,992
| -30% | -$1.37M |
|
1115
PUT
Digital Realty Trust
DLR
$73.7B
| $3.46M | 0.01% |
246
-276
| -53% | -$38.1K |
|
1116
CALL
PPG Industries
PPG
$25.9B
| $3.46M | 0.01% |
230
-85
| -27% | -$12.2K |
|
1117
CALL
InMode
INMD
$872M
| $3.45M | 0.01% |
954
+224
| +31% | +$7.27K |
|
1118
CALL
NovoCure
NVCR
$2.04B
| $3.45M | 0.01% |
261
-514
| -66% | -$81.3K |
|
1119
PUT
Dominion Energy
D
$62.5B
| $3.44M | 0.01% |
453
-192
| -30% | -$13.9K |
|
1120
Tyson Foods
TSN
$20.2B
| $3.43M | 0.01% |
46,178
+26,750
| +138% | +$1.85M |
|
|
ZEV
1121
CALL
DELISTED
Lightning eMotors, Inc.
ZEV
| $3.43M | 0.01% |
161
+118
| +274% | +$31.7K |
|
1122
PUT
Huntsman Corp
HUN
$2.24B
| $3.43M | 0.01% |
1,189
+947
| +391% | +$26.5K |
|
|
MNDT
1123
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $3.42M | 0.01% |
174,817
+85,298
| +95% | +$1.78M |
|
|
TTCF
1124
CALL
DELISTED
Tattooed Chef, Inc Class A Common Stock
TTCF
| $3.42M | 0.01% |
1,758
-65
| -4% | -$1.46K |
|
1125
Lincoln National
LNC
$7.91B
| $3.41M | 0.01% |
54,814
-17,179
| -24% | -$949K |
|
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.