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 | |
|---|---|---|---|---|---|---|
1351
CALL
EQT Corp
EQT
$33.2B
| $2.59M | ﹤0.01% |
1,392
-72
| -5% | -$1.25K |
|
|
XYZ
1352
Block Inc
XYZ
$45.9B
| $2.58M | ﹤0.01% |
11,386
+11,349
| +30,673% | +$2.65M |
|
|
WRK
1353
PUT
DELISTED
WestRock Company
WRK
| $2.58M | ﹤0.01% |
495
+124
| +33% | +$5.79K |
|
1354
PUT
Deutsche Bank
DB
$66.3B
| $2.57M | ﹤0.01% |
+2,143
| New | +$25K |
|
1355
CALL
Navios Maritime Partners
NMM
$2.25B
| $2.57M | ﹤0.01% |
1,091
+918
| +531% | +$16.4K |
|
1356
Celanese
CE
$5.09B
| $2.57M | ﹤0.01% |
17,146
+9,959
| +139% | +$1.37M |
|
1357
PUT
The Beachbody Company
BODI
$78.9M
| $2.56M | ﹤0.01% |
+51
| New | +$28.7K |
|
1358
CALL
Crown Holdings
CCK
$12.8B
| $2.56M | ﹤0.01% |
264
+181
| +218% | +$17.4K |
|
1359
CALL
Armstrong World Industries
AWI
$6.86B
| $2.56M | ﹤0.01% |
284
+282
| +14,100% | +$23.9K |
|
1360
CALL
Park Hotels & Resorts
PK
$2.97B
| $2.56M | ﹤0.01% |
1,185
+62
| +6% | +$1.23K |
|
1361
CALL
L3Harris
LHX
$55.9B
| $2.55M | ﹤0.01% |
126
-44
| -26% | -$8.26K |
|
|
ROIC
1362
CALL
DELISTED
Retail Opportunity Investments Corp.
ROIC
| $2.55M | ﹤0.01% |
1,607
-48
| -3% | -$736 |
|
1363
CALL
KB Home
KBH
$3.48B
| $2.55M | ﹤0.01% |
548
+39
| +8% | +$1.61K |
|
1364
CALL
AvalonBay Communities
AVB
$27.1B
| $2.55M | ﹤0.01% |
138
+8
| +6% | +$1.4K |
|
|
SI
1365
PUT
DELISTED
Silvergate Capital Corporation
SI
| $2.54M | ﹤0.01% |
+179
| New | +$21.2K |
|
1366
GSK
GSK
$103B
| $2.54M | ﹤0.01% |
56,996
-27,130
| -32% | -$1.23M |
|
1367
Intuit
INTU
$81.1B
| $2.54M | ﹤0.01% |
6,622
+3,518
| +113% | +$1.35M |
|
1368
CALL
Polaris
PII
$4.15B
| $2.54M | ﹤0.01% |
190
+13
| +7% | +$1.58K |
|
1369
CALL
RLX Technology
RLX
$2.48B
| $2.54M | ﹤0.01% |
+2,447
| New | +$47.1K |
|
|
MRSH
1370
PUT
Marsh
MRSH
$86.3B
| $2.53M | ﹤0.01% |
208
-212
| -50% | -$24.4K |
|
|
STMP
1371
CALL
DELISTED
Stamps.com, Inc.
STMP
| $2.53M | ﹤0.01% |
+127
| New | +$27.1K |
|
1372
CALL
Invesco CurrencyShares British Pound Sterling Trust
FXB
$76.9M
| $2.53M | ﹤0.01% |
190
+179
| +1,627% | +$23.8K |
|
1373
CALL
Camping World
CWH
$363M
| $2.52M | ﹤0.01% |
694
-923
| -57% | -$32.8K |
|
1374
Linde
LIN
$237B
| $2.52M | ﹤0.01% |
9,005
+8,645
| +2,401% | +$2.24M |
|
1375
CALL
Scorpio Tankers
STNG
$3.96B
| $2.52M | ﹤0.01% |
+1,366
| New | +$21.1K |
|
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 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.