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 | |
|---|---|---|---|---|---|---|
1776
CALL
Prologis
PLD
$138B
| $1.72M | ﹤0.01% |
+162
| New | +$16.5K |
|
1777
CALL
TAL Education Group
TAL
$5.71B
| $1.72M | ﹤0.01% |
319
-358
| -53% | -$26.2K |
|
1778
Gaotu Techedu
GOTU
$372M
| $1.72M | ﹤0.01% |
+50,641
| New | +$4.12M |
|
|
NCTY
1779
CALL
The9 Ltd
NCTY
$49M
| $1.72M | ﹤0.01% |
55
+48
| +686% | +$16.4K |
|
1780
CALL
Ovintiv
OVV
$17.5B
| $1.72M | ﹤0.01% |
1,558
-1,099
| -41% | -$23.5K |
|
|
SPTN
1781
PUT
DELISTED
SpartanNash
SPTN
| $1.72M | ﹤0.01% |
874
+709
| +430% | +$13.4K |
|
1782
CALL
Sensata Technologies
ST
$6.65B
| $1.72M | ﹤0.01% |
296
+106
| +56% | +$6.11K |
|
1783
CALL
Katapult Holdings
KPLT
$32.8M
| $1.71M | ﹤0.01% |
+52
| New | +$20.1K |
|
1784
Alcoa
AA
$11.7B
| $1.71M | ﹤0.01% |
52,552
+19,450
| +59% | +$492K |
|
1785
CALL
Boot Barn
BOOT
$4.55B
| $1.71M | ﹤0.01% |
274
+58
| +27% | +$3.4K |
|
1786
CALL
ResMed
RMD
$28.3B
| $1.71M | ﹤0.01% |
88
-115
| -57% | -$23.1K |
|
|
CLR
1787
CALL
DELISTED
CONTINENTAL RESOURCES INC.
CLR
| $1.71M | ﹤0.01% |
660
-379
| -36% | -$8.89K |
|
1788
PUT
Agios Pharmaceuticals
AGIO
$2.16B
| $1.7M | ﹤0.01% |
330
-3
| -0.9% | -$149 |
|
1789
CALL
Lifetime Brands
LCUT
$199M
| $1.7M | ﹤0.01% |
1,160
+226
| +24% | +$3.27K |
|
1790
CALL
LendingTree
TREE
$544M
| $1.7M | ﹤0.01% |
80
-2
| -2% | -$569 |
|
1791
PUT
Mid-America Apartment Communities
MAA
$15.6B
| $1.7M | ﹤0.01% |
118
-27
| -19% | -$3.67K |
|
1792
PUT
Teleflex
TFX
$5.85B
| $1.7M | ﹤0.01% |
41
+40
| +4,000% | +$16K |
|
1793
Public Storage
PSA
$60.2B
| $1.7M | ﹤0.01% |
+6,899
| New | +$1.61M |
|
1794
BioMarin Pharmaceuticals
BMRN
$11.5B
| $1.7M | ﹤0.01% |
22,524
+22,424
| +22,424% | +$1.83M |
|
|
CHNG
1795
PUT
DELISTED
Change Healthcare Inc. Common Stock
CHNG
| $1.7M | ﹤0.01% |
+769
| New | +$17.8K |
|
1796
CALL
1-800-Flowers.com
FLWS
$245M
| $1.7M | ﹤0.01% |
615
-27
| -4% | -$802 |
|
|
XIFR
1797
CALL
XPLR Infrastructure LP
XIFR
$1.18B
| $1.7M | ﹤0.01% |
233
+178
| +324% | +$13.7K |
|
1798
PUT
AudioCodes
AUDC
$244M
| $1.69M | ﹤0.01% |
628
+571
| +1,002% | +$17K |
|
1799
Hershey
HSY
$35.4B
| $1.69M | ﹤0.01% |
10,711
+1,343
| +14% | +$202K |
|
|
DM
1800
DELISTED
Desktop Metal, Inc.
DM
| $1.69M | ﹤0.01% |
11,369
+5,515
| +94% | +$1.21M |
|
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.