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 | Miscellaneous | 97.22% |
| 2 | Technology | 0.66% |
| 3 | Consumer Discretionary | 0.49% |
| 4 | Healthcare | 0.33% |
| 5 | Financials | 0.3% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
901
CALL
Wolfspeed
WOLF
$1.47B
| $4.51M | 0.01% |
417
-554
| -57% | -$62.2K |
|
902
CALL
Joby Aviation
JOBY
$6.67B
| $4.5M | 0.01% |
+4,438
| New | +$53.8K |
|
903
PUT
Amplify Junior Silver Miners ETF
SILJ
$4.16B
| $4.5M | 0.01% |
3,585
+1,756
| +96% | +$27K |
|
904
CALL
PagSeguro Digital
PAGS
$2.68B
| $4.5M | 0.01% |
971
-28
| -3% | -$1.5K |
|
905
CALL
Teradyne
TER
$55.8B
| $4.49M | 0.01% |
369
-44
| -11% | -$5.53K |
|
906
CALL
ProShares Ultra Bloomberg Natural Gas
BOIL
$417M
| $4.48M | 0.01% |
5
-10
| -67% | -$47.4K |
|
|
GAP
907
The Gap Inc
GAP
$7.88B
| $4.48M | 0.01% |
150,430
+130,184
| +643% | +$3.24M |
|
908
PUT
New Oriental
EDU
$9.47B
| $4.47M | 0.01% |
320
+82
| +34% | +$14.3K |
|
909
CALL
Upstart Holdings
UPST
$2.73B
| $4.47M | 0.01% |
+347
| New | +$26.6K |
|
910
PUT
3D Systems Corp
DDD
$575M
| $4.47M | 0.01% |
1,629
+464
| +40% | +$15.3K |
|
911
PUT
O'Reilly Automotive
ORLY
$71.1B
| $4.46M | 0.01% |
1,320
-1,545
| -54% | -$47.9K |
|
|
CALY
912
CALL
Callaway Golf Company
CALY
$2.84B
| $4.46M | 0.01% |
1,668
+682
| +69% | +$19.3K |
|
913
CALL
GrowGeneration
GRWG
$97.2M
| $4.46M | 0.01% |
+897
| New | +$44.7K |
|
|
QNGY
914
CALL
DELISTED
Quanergy Systems, Inc.
QNGY
| $4.46M | 0.01% |
+223
| New | +$47.8K |
|
915
CALL
Weyerhaeuser
WY
$16.6B
| $4.45M | 0.01% |
1,251
-226
| -15% | -$7.7K |
|
|
916
PUT
GrowGeneration
GRWG
$97.2M
| $4.45M | 0.01% |
+896
| New | +$44.7K |
|
917
CALL
Hasbro
HAS
$13.1B
| $4.45M | 0.01% |
463
+9
| +2% | +$854 |
|
918
PUT
Sysco
SYY
$38.4B
| $4.45M | 0.01% |
565
-323
| -36% | -$25K |
|
919
PUT
Ball Corp
BALL
$16.6B
| $4.44M | 0.01% |
524
-613
| -54% | -$53.7K |
|
920
PUT
Yum! Brands
YUM
$41.1B
| $4.43M | 0.01% |
+410
| New | +$43.4K |
|
|
APHA
921
PUT
DELISTED
Aphria Inc. Common Shares
APHA
| $4.43M | 0.01% |
2,410
-1,152
| -32% | -$18.7K |
|
922
CALL
Booz Allen Hamilton
BAH
$8.76B
| $4.42M | 0.01% |
549
+262
| +91% | +$22K |
|
923
PUT
Urban Outfitters
URBN
$6.94B
| $4.41M | 0.01% |
+1,185
| New | +$38.3K |
|
924
Johnson & Johnson
JNJ
$663B
| $4.38M | 0.01% |
26,670
-93,750
| -78% | -$15.2M |
|
925
PUT
Acadia Healthcare
ACHC
$2.62B
| $4.38M | 0.01% |
767
+765
| +38,250% | +$41.4K |
|
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's Q1 2021 filing shows 2,255 new, 3,360 increased, 3,150 reduced and 1,707 closed positions. Its largest new stake was Pfizer: 464,628 shares worth $16.8M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Miscellaneous at 97% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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 2,255 new positions and closed 1,707 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.