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 | |
|---|---|---|---|---|---|---|
|
FITB
1551
CALL
Fifth Third Bancorp
FITB
$52B
| $2.1M | ﹤0.01% |
561
+210
| +60% | +$7.12K |
|
1552
CALL
Seres Therapeutics
MCRB
$48M
| $2.1M | ﹤0.01% |
51
+49
| +2,450% | +$22.6K |
|
1553
PUT
Tandem Diabetes Care
TNDM
$1.17B
| $2.1M | ﹤0.01% |
238
-98
| -29% | -$9.11K |
|
1554
CALL
Zumiez
ZUMZ
$320M
| $2.1M | ﹤0.01% |
489
+83
| +20% | +$3.7K |
|
1555
PUT
UWM Holdings
UWMC
$621M
| $2.1M | ﹤0.01% |
2,643
-921
| -26% | -$8.93K |
|
|
BAND
1556
CALL
Bandwidth Inc
BAND
$1.91B
| $2.09M | ﹤0.01% |
165
+47
| +40% | +$7.28K |
|
1557
Coty
COTY
$2.33B
| $2.09M | ﹤0.01% |
231,987
+100,985
| +77% | +$771K |
|
|
HOUS
1558
PUT
DELISTED
Anywhere Real Estate
HOUS
| $2.09M | ﹤0.01% |
1,380
-776
| -36% | -$12.3K |
|
1559
Constellation Brands
STZ
$22.2B
| $2.08M | ﹤0.01% |
+9,141
| New | +$2.06M |
|
1560
PUT
Thomson Reuters
TRI
$39.4B
| $2.08M | ﹤0.01% |
226
+123
| +119% | +$10.9K |
|
1561
Vanguard Total Stock Market ETF
VTI
$654B
| $2.08M | ﹤0.01% |
+10,063
| New | +$2.04M |
|
|
INFO
1562
CALL
DELISTED
IHS Markit Ltd. Common Shares
INFO
| $2.07M | ﹤0.01% |
214
-32
| -13% | -$2.93K |
|
1563
PUT
ImmunityBio
IBRX
$7.44B
| $2.07M | ﹤0.01% |
872
-306
| -26% | -$7.93K |
|
1564
CALL
New York Times
NYT
$11.6B
| $2.07M | ﹤0.01% |
409
-320
| -44% | -$16.1K |
|
|
NUAN
1565
DELISTED
Nuance Communications, Inc.
NUAN
| $2.07M | ﹤0.01% |
47,417
+18,344
| +63% | +$843K |
|
1566
Corteva
CTVA
$59.7B
| $2.07M | ﹤0.01% |
+44,366
| New | +$1.96M |
|
1567
PUT
Consolidated Edison
ED
$41.6B
| $2.06M | ﹤0.01% |
276
-381
| -58% | -$26.8K |
|
1568
Oracle
ORCL
$331B
| $2.06M | ﹤0.01% |
+29,411
| New | +$1.9M |
|
1569
CALL
AdaptHealth
AHCO
$1.46B
| $2.06M | ﹤0.01% |
561
+556
| +11,120% | +$19.6K |
|
|
1570
Thomson Reuters
TRI
$39.4B
| $2.06M | ﹤0.01% |
22,356
+21,795
| +3,885% | +$1.94M |
|
1571
CALL
GeneDx Holdings
WGS
$1.75B
| $2.06M | ﹤0.01% |
+42
| New | +$21.8K |
|
1572
Magnite
MGNI
$2.65B
| $2.06M | ﹤0.01% |
49,469
+14,173
| +40% | +$614K |
|
1573
CALL
Porch Group
PRCH
$1.3B
| $2.06M | ﹤0.01% |
+1,163
| New | +$20.7K |
|
1574
PUT
Henry Schein
HSIC
$9.74B
| $2.06M | ﹤0.01% |
297
+28
| +10% | +$1.9K |
|
1575
Nano X Imaging
NNOX
$62.4M
| $2.06M | ﹤0.01% |
49,583
+48,393
| +4,067% | +$2.61M |
|
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.