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 | |
|---|---|---|---|---|---|---|
601
CALL
ChargePoint
CHPT
$140M
| $6.97M | 0.01% |
131
+77
| +143% | +$52K |
|
|
ISBC
602
CALL
DELISTED
Investors Bancorp, Inc.
ISBC
| $6.93M | 0.01% |
4,720
+4,592
| +3,588% | +$59.3K |
|
603
PUT
Workhorse Group
WKHS
$30.1M
| $6.92M | 0.01% |
2
+1
| +100% | +$71.8K |
|
604
PUT
Stellantis
STLA
$16.7B
| $6.92M | 0.01% |
+3,891
| New | +$65.4K |
|
|
JWN
605
PUT
DELISTED
Nordstrom
JWN
| $6.92M | 0.01% |
1,826
+803
| +78% | +$29.7K |
|
606
CALL
Caesars Entertainment
CZR
$6.09B
| $6.9M | 0.01% |
789
-282
| -26% | -$23.7K |
|
607
CALL
HCA Healthcare
HCA
$83.5B
| $6.89M | 0.01% |
366
+64
| +21% | +$11.3K |
|
608
PUT
Opendoor
OPEN
$3.71B
| $6.89M | 0.01% |
3,358
+747
| +29% | +$19.7K |
|
609
PUT
International Flavors & Fragrances
IFF
$18.8B
| $6.88M | 0.01% |
493
-598
| -55% | -$77.3K |
|
610
CALL
Sysco
SYY
$39.1B
| $6.88M | 0.01% |
874
+518
| +146% | +$40.2K |
|
|
ZEN
611
CALL
DELISTED
ZENDESK INC
ZEN
| $6.87M | 0.01% |
518
-61
| -11% | -$8.74K |
|
612
PUT
ScottsMiracle-Gro
SMG
$3.93B
| $6.86M | 0.01% |
280
-10
| -3% | -$2.26K |
|
613
Fiverr
FVRR
$370M
| $6.85M | 0.01% |
31,528
+18,624
| +144% | +$4.56M |
|
614
PUT
General Mills
GIS
$19B
| $6.84M | 0.01% |
1,116
-37
| -3% | -$2.13K |
|
615
PUT
Cleveland-Cliffs
CLF
$6.25B
| $6.83M | 0.01% |
3,396
+1,607
| +90% | +$26.2K |
|
|
JMIA
616
PUT
Jumia Technologies
JMIA
$734M
| $6.83M | 0.01% |
1,926
-892
| -32% | -$42.7K |
|
|
WORK
617
DELISTED
Slack Technologies, Inc.
WORK
| $6.82M | 0.01% |
167,959
+167,609
| +47,888% | +$7.01M |
|
618
CALL
Universal Display
OLED
$3.71B
| $6.82M | 0.01% |
288
-145
| -33% | -$33.5K |
|
619
iShares Expanded Tech-Software Sector ETF
IGV
$12.9B
| $6.79M | 0.01% |
+99,470
| New | +$7.05M |
|
|
CVAC
620
CALL
DELISTED
CureVac
CVAC
| $6.79M | 0.01% |
+742
| New | +$72K |
|
621
CALL
Nano X Imaging
NNOX
$67.8M
| $6.77M | 0.01% |
1,633
+780
| +91% | +$42K |
|
622
CALL
Synopsys
SNPS
$71.5B
| $6.76M | 0.01% |
273
-27
| -9% | -$6.86K |
|
623
Ford
F
$56.4B
| $6.74M | 0.01% |
550,304
+500,304
| +1,001% | +$5.72M |
|
624
PUT
Nokia
NOK
$54.3B
| $6.73M | 0.01% |
17,007
+13,595
| +398% | +$56.7K |
|
625
CALL
Vodafone
VOD
$35.1B
| $6.7M | 0.01% |
3,638
+2,364
| +186% | +$42.7K |
|
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.