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 | |
|---|---|---|---|---|---|---|
876
PUT
BHP
BHP
$213B
| $4.68M | 0.01% |
756
+237
| +46% | +$15.3K |
|
877
PUT
Automatic Data Processing
ADP
$100B
| $4.67M | 0.01% |
248
-36
| -13% | -$6.25K |
|
|
NNDM
878
PUT
Nano Dimension
NNDM
$309M
| $4.66M | 0.01% |
5,422
+2,811
| +108% | +$32.3K |
|
|
K
879
CALL
DELISTED
Kellanova
K
| $4.65M | 0.01% |
783
+107
| +16% | +$5.99K |
|
880
PUT
Alcon
ALC
$33.1B
| $4.64M | 0.01% |
662
+411
| +164% | +$29.1K |
|
881
Sea Limited
SE
$61.2B
| $4.64M | 0.01% |
20,804
-21,400
| -51% | -$4.97M |
|
|
AKRO
882
PUT
DELISTED
Akero Therapeutics
AKRO
| $4.63M | 0.01% |
+1,598
| New | +$48.4K |
|
|
FL
883
CALL
DELISTED
Foot Locker
FL
| $4.62M | 0.01% |
+822
| New | +$41.8K |
|
884
PUT
Nexstar Media Group
NXST
$5.6B
| $4.62M | 0.01% |
+329
| New | +$43.1K |
|
|
FSR
885
CALL
DELISTED
Fisker Inc.
FSR
| $4.61M | 0.01% |
2,677
-1,867
| -41% | -$34.2K |
|
886
CALL
First Trust Natural Gas ETF
FCG
$632M
| $4.6M | 0.01% |
307
+65
| +27% | +$766 |
|
|
PRAH
887
PUT
DELISTED
PRA Health Sciences, Inc.
PRAH
| $4.6M | 0.01% |
+300
| New | +$40.7K |
|
888
CALL
RingCentral
RNG
$4.05B
| $4.59M | 0.01% |
+154
| New | +$56.6K |
|
889
PUT
Revvity
RVTY
$12.3B
| $4.58M | 0.01% |
357
+126
| +55% | +$17.5K |
|
890
CALL
Americold
COLD
$4.09B
| $4.58M | 0.01% |
1,190
+1,182
| +14,775% | +$42.5K |
|
|
CMRC
891
CALL
Commerce.com Inc Series 1
CMRC
$224M
| $4.57M | 0.01% |
791
+48
| +6% | +$3.19K |
|
892
PUT
Dick's Sporting Goods
DKS
$18.4B
| $4.57M | 0.01% |
600
-306
| -34% | -$22K |
|
893
CALL
Ventas
VTR
$48.9B
| $4.57M | 0.01% |
856
+586
| +217% | +$30.1K |
|
894
PUT
Pan American Silver
PAAS
$18.6B
| $4.56M | 0.01% |
1,518
+507
| +50% | +$16.5K |
|
|
MNDT
895
PUT
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $4.54M | 0.01% |
2,320
-573
| -20% | -$12K |
|
896
CALL
Oshkosh
OSK
$9.67B
| $4.53M | 0.01% |
382
+8
| +2% | +$829 |
|
897
PUT
Vuzix
VUZI
$190M
| $4.53M | 0.01% |
1,780
+1,014
| +132% | +$16.5K |
|
898
PUT
Manulife Financial
MFC
$72.6B
| $4.53M | 0.01% |
2,106
+823
| +64% | +$16.4K |
|
899
Blackrock
BLK
$164B
| $4.52M | 0.01% |
5,998
+4,315
| +256% | +$3.13M |
|
900
Sherwin-Williams
SHW
$78.3B
| $4.51M | 0.01% |
18,342
+14,436
| +370% | +$3.44M |
|
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.