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 | |
|---|---|---|---|---|---|---|
1126
PUT
Churchill Downs
CHDN
$6.03B
| $3.41M | 0.01% |
300
| – | – |
|
1127
CALL
The Beachbody Company
BODI
$78.9M
| $3.41M | 0.01% |
+67
| New | +$37.7K |
|
1128
CALL
Sherwin-Williams
SHW
$78.3B
| $3.39M | 0.01% |
138
-438
| -76% | -$104K |
|
1129
CALL
Ouster
OUST
$2.29B
| $3.39M | 0.01% |
+399
| New | +$49.4K |
|
1130
CALL
Ocugen
OCGN
$410M
| $3.39M | 0.01% |
+4,988
| New | +$33.2K |
|
1131
PUT
Penumbra
PEN
$12.5B
| $3.38M | 0.01% |
+125
| New | +$32.3K |
|
1132
CALL
AGNC Investment
AGNC
$12.3B
| $3.38M | 0.01% |
2,017
+198
| +11% | +$3.2K |
|
1133
PUT
Polaris
PII
$4.15B
| $3.38M | 0.01% |
253
+69
| +38% | +$8.41K |
|
1134
PUT
Jazz Pharmaceuticals
JAZZ
$15.9B
| $3.37M | 0.01% |
205
-33
| -14% | -$5.43K |
|
1135
PUT
Vodafone
VOD
$34.9B
| $3.37M | 0.01% |
1,827
+94
| +5% | +$1.7K |
|
1136
TransDigm Group
TDG
$69.2B
| $3.36M | 0.01% |
5,710
+5,083
| +811% | +$3M |
|
1137
PUT
Cencora
COR
$60.3B
| $3.35M | 0.01% |
284
-420
| -60% | -$45.4K |
|
1138
CALL
Fair Isaac
FICO
$28.7B
| $3.35M | 0.01% |
69
+22
| +47% | +$10.5K |
|
1139
Occidental Petroleum
OXY
$57B
| $3.35M | 0.01% |
125,845
-51,055
| -29% | -$1.28M |
|
|
JNPR
1140
CALL
DELISTED
Juniper Networks
JNPR
| $3.34M | 0.01% |
1,319
-84
| -6% | -$2.07K |
|
1141
PUT
H&R Block
HRB
$5.18B
| $3.33M | 0.01% |
1,528
+920
| +151% | +$17.4K |
|
|
BLUE
1142
PUT
DELISTED
bluebird bio
BLUE
| $3.31M | 0.01% |
85
+28
| +49% | +$13.8K |
|
1143
CALL
Funko
FNKO
$323M
| $3.3M | 0.01% |
1,677
+1,112
| +197% | +$15.5K |
|
1144
CALL
Vontier
VNT
$4.33B
| $3.3M | 0.01% |
1,090
+1,051
| +2,695% | +$34.3K |
|
1145
PUT
Intellia Therapeutics
NTLA
$1.5B
| $3.29M | 0.01% |
410
-63
| -13% | -$4.23K |
|
|
ML
1146
CALL
DELISTED
MoneyLion Inc.
ML
| $3.28M | 0.01% |
+110
| New | +$36.7K |
|
1147
CALL
Ball Corp
BALL
$17B
| $3.28M | 0.01% |
387
-19
| -5% | -$1.66K |
|
1148
PUT
Travelers Companies
TRV
$80.8B
| $3.28M | 0.01% |
218
-145
| -40% | -$21.3K |
|
1149
CALL
Cheesecake Factory
CAKE
$4.21B
| $3.28M | 0.01% |
560
+141
| +34% | +$7.13K |
|
1150
Aptiv
APTV
$12B
| $3.27M | 0.01% |
+23,741
| New | +$3.45M |
|
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.