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 | |
|---|---|---|---|---|---|---|
|
WRK
801
CALL
DELISTED
WestRock Company
WRK
| $5.11M | 0.01% |
981
+51
| +5% | +$2.38K |
|
802
CALL
NCR Voyix
VYX
$1.26B
| $5.1M | 0.01% |
2,192
+1,675
| +324% | +$36.8K |
|
803
PUT
Invesco S&P SmallCap Low Volatility ETF
XSLV
$253M
| $5.1M | 0.01% |
3,786
-1,532
| -29% | -$68K |
|
804
Apple
AAPL
$4.67T
| $5.1M | 0.01% |
41,755
-183,892
| -81% | -$23.6M |
|
805
PUT
Duke Energy
DUK
$93.7B
| $5.09M | 0.01% |
527
-487
| -48% | -$44.4K |
|
806
PUT
Boston Scientific
BSX
$69.3B
| $5.08M | 0.01% |
1,315
-1,202
| -48% | -$45.5K |
|
807
CALL
Ionis Pharmaceuticals
IONS
$9.65B
| $5.08M | 0.01% |
1,130
+102
| +10% | +$5.69K |
|
808
PUT
Invesco CurrencyShares Euro Currency Trust
FXE
$370M
| $5.08M | 0.01% |
462
-1,598
| -78% | -$181K |
|
|
SPR
809
CALL
DELISTED
Spirit AeroSystems
SPR
| $5.07M | 0.01% |
1,043
-690
| -40% | -$29.5K |
|
|
RBAC
810
CALL
DELISTED
RedBall Acquisition Corp.
RBAC
| $5.06M | 0.01% |
5,090
+4,503
| +767% | +$47.5K |
|
811
CALL
JB Hunt Transport Services
JBHT
$25.7B
| $5.06M | 0.01% |
301
+191
| +174% | +$28.7K |
|
812
CALL
DXC Technology
DXC
$1.86B
| $5.06M | 0.01% |
1,618
+684
| +73% | +$18.8K |
|
813
Novavax
NVAX
$1.69B
| $5.05M | 0.01% |
27,851
-10,451
| -27% | -$2.08M |
|
|
HUYA
814
PUT
Huya Inc
HUYA
$484M
| $5.04M | 0.01% |
2,590
-87
| -3% | -$2.18K |
|
815
CALL
Nutrien
NTR
$37.9B
| $5.04M | 0.01% |
936
+639
| +215% | +$34.8K |
|
816
PUT
Rockwell Automation
ROK
$48.2B
| $5.04M | 0.01% |
+190
| New | +$48.5K |
|
817
PUT
Mondelez International
MDLZ
$78.2B
| $5.04M | 0.01% |
861
-152
| -15% | -$8.58K |
|
818
PUT
State Street
STT
$53.4B
| $5.03M | 0.01% |
599
-232
| -28% | -$18K |
|
819
PUT
Keurig Dr Pepper
KDP
$44.3B
| $5M | 0.01% |
1,454
-304
| -17% | -$9.85K |
|
820
PUT
STMicroelectronics
STM
$46.6B
| $4.99M | 0.01% |
1,303
-1,551
| -54% | -$60.5K |
|
|
DISH
821
CALL
DELISTED
DISH Network Corp.
DISH
| $4.99M | 0.01% |
+1,378
| New | +$45.9K |
|
822
Tencent Music
TME
$13.5B
| $4.98M | 0.01% |
+243,272
| New | +$6.17M |
|
823
Zscaler
ZS
$27.7B
| $4.98M | 0.01% |
+29,026
| New | +$5.77M |
|
|
MIC
824
PUT
DELISTED
Macquarie Infrastructure Holdings, LLC
MIC
| $4.97M | 0.01% |
1,564
-220
| -12% | -$6.89K |
|
825
PUT
Church & Dwight Co
CHD
$23.4B
| $4.97M | 0.01% |
569
+205
| +56% | +$17.1K |
|
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.