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 | |
|---|---|---|---|---|---|---|
1026
PUT
Ventas
VTR
$48.9B
| $3.83M | 0.01% |
719
-1,169
| -62% | -$60K |
|
|
NEWR
1027
PUT
DELISTED
New Relic, Inc.
NEWR
| $3.83M | 0.01% |
623
+573
| +1,146% | +$38.1K |
|
1028
CALL
Antero Resources
AR
$10.9B
| $3.83M | 0.01% |
3,753
-377
| -9% | -$3.19K |
|
1029
CALL
Factset
FDS
$9.05B
| $3.83M | 0.01% |
124
+80
| +182% | +$25.3K |
|
|
SFIX
1030
PUT
Stitch Fix
SFIX
$478M
| $3.82M | 0.01% |
+772
| New | +$54.4K |
|
1031
Synopsys
SNPS
$71.5B
| $3.82M | 0.01% |
+15,435
| New | +$3.92M |
|
1032
CALL
Vanguard FTSE Europe ETF
VGK
$30B
| $3.82M | 0.01% |
690
-494
| -42% | -$30.7K |
|
1033
CALL
Toronto Dominion Bank
TD
$198B
| $3.81M | 0.01% |
585
-14
| -2% | -$855 |
|
1034
CALL
Microvast
MVST
$267M
| $3.81M | 0.01% |
+3,096
| New | +$50.5K |
|
|
ATIP
1035
PUT
DELISTED
ATI Physical Therapy, Inc.
ATIP
| $3.81M | 0.01% |
+76
| New | +$41.6K |
|
1036
CALL
Aptiv
APTV
$12B
| $3.81M | 0.01% |
276
-253
| -48% | -$36.8K |
|
1037
PUT
Hewlett Packard
HPE
$63.2B
| $3.8M | 0.01% |
2,417
-392
| -14% | -$5.43K |
|
1038
CALL
Agilent Technologies
A
$39.1B
| $3.8M | 0.01% |
299
-3
| -1% | -$371 |
|
1039
CALL
International Flavors & Fragrances
IFF
$19.4B
| $3.8M | 0.01% |
272
-45
| -14% | -$5.82K |
|
1040
Marriott International
MAR
$98.7B
| $3.79M | 0.01% |
+25,598
| New | +$3.49M |
|
1041
CALL
Ferrari
RACE
$63.3B
| $3.79M | 0.01% |
181
-156
| -46% | -$31.9K |
|
1042
PUT
Danaher
DHR
$135B
| $3.78M | 0.01% |
190
-67
| -26% | -$13.6K |
|
|
SF
1043
CALL
Stifel
SF
$12.3B
| $3.77M | 0.01% |
593
-238
| -29% | -$9.28K |
|
|
BFX
1044
PUT
DELISTED
BowFlex Inc.
BFX
| $3.77M | 0.01% |
2,410
+1,212
| +101% | +$26.1K |
|
1045
CALL
Eastman Chemical
EMN
$7.8B
| $3.77M | 0.01% |
342
+70
| +26% | +$7.6K |
|
1046
CALL
EPR Properties
EPR
$4.86B
| $3.76M | 0.01% |
808
-886
| -52% | -$37.4K |
|
|
ABMD
1047
CALL
DELISTED
Abiomed Inc
ABMD
| $3.76M | 0.01% |
118
-22
| -16% | -$7.04K |
|
1048
PUT
iShares Gold Trust
IAU
$63B
| $3.76M | 0.01% |
1,156
+468
| +68% | +$16K |
|
1049
CALL
Ericsson
ERIC
$30.7B
| $3.75M | 0.01% |
2,841
+824
| +41% | +$10.5K |
|
1050
CALL
US Foods
USFD
$21.4B
| $3.75M | 0.01% |
983
+716
| +268% | +$25.9K |
|
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.