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 | |
|---|---|---|---|---|---|---|
1601
PUT
Bumble
BMBL
$367M
| $2.01M | ﹤0.01% |
+322
| New | +$21.7K |
|
1602
Bionano Genomics
BNGO
$12.7M
| $2M | ﹤0.01% |
+414
| New | +$2.33M |
|
|
SGI
1603
CALL
Somnigroup International
SGI
$15.1B
| $2M | ﹤0.01% |
548
-175
| -24% | -$5.67K |
|
1604
CALL
FIVE9
FIVN
$1.77B
| $2M | ﹤0.01% |
128
-18
| -12% | -$3.08K |
|
|
HAPN
1605
Happen Inc
HAPN
$2.08B
| $2M | ﹤0.01% |
121,135
+96,496
| +392% | +$1.27M |
|
1606
CALL
Moody's
MCO
$81.7B
| $2M | ﹤0.01% |
67
+26
| +63% | +$7.32K |
|
|
SLCA
1607
PUT
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
| $2M | ﹤0.01% |
1,627
+90
| +6% | +$980 |
|
1608
CALL
AvePoint
AVPT
$2.6B
| $2M | ﹤0.01% |
1,804
+1,177
| +188% | +$16.5K |
|
1609
Paysafe
PSFE
$407M
| $2M | ﹤0.01% |
+12,339
| New | +$2M |
|
|
GRMN
1610
CALL
Garmin
GRMN
$46.9B
| $1.99M | ﹤0.01% |
151
-245
| -62% | -$30.5K |
|
1611
PUT
Conagra Brands
CAG
$7.07B
| $1.99M | ﹤0.01% |
+529
| New | +$18.7K |
|
1612
Chegg
CHGG
$108M
| $1.99M | ﹤0.01% |
+23,188
| New | +$2.21M |
|
1613
Capri Holdings
CPRI
$1.77B
| $1.98M | ﹤0.01% |
38,872
-14,623
| -27% | -$689K |
|
1614
PUT
Aflac
AFL
$63.9B
| $1.98M | ﹤0.01% |
387
-270
| -41% | -$13K |
|
|
AKRO
1615
DELISTED
Akero Therapeutics
AKRO
| $1.97M | ﹤0.01% |
+68,063
| New | +$2.06M |
|
|
GMS
1616
DELISTED
GMS Inc
GMS
| $1.97M | ﹤0.01% |
47,289
+46,574
| +6,514% | +$1.66M |
|
1617
CALL
Parsons
PSN
$6.28B
| $1.97M | ﹤0.01% |
488
+449
| +1,151% | +$17K |
|
1618
PUT
Assured Guaranty
AGO
$3.78B
| $1.97M | ﹤0.01% |
465
+172
| +59% | +$6.88K |
|
1619
PUT
Corning
GLW
$126B
| $1.97M | ﹤0.01% |
452
-911
| -67% | -$35K |
|
1620
Halliburton
HAL
$27.9B
| $1.96M | ﹤0.01% |
91,524
+1,763
| +2% | +$36.9K |
|
1621
PUT
New Fortress Energy
NFE
$101M
| $1.96M | ﹤0.01% |
428
+254
| +146% | +$12.4K |
|
1622
ProShares Ultra Bloomberg Crude Oil
UCO
$443M
| $1.96M | ﹤0.01% |
148,448
-37,012
| -20% | -$465K |
|
1623
CALL
Travel + Leisure Co
TNL
$4.54B
| $1.96M | ﹤0.01% |
320
-46
| -13% | -$2.5K |
|
1624
Blackbaud
BLKB
$1.5B
| $1.95M | ﹤0.01% |
27,475
+14,431
| +111% | +$996K |
|
1625
Teradata
TDC
$2.68B
| $1.95M | ﹤0.01% |
50,607
+24,927
| +97% | +$910K |
|
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.