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 | |
|---|---|---|---|---|---|---|
226
CALL
CrowdStrike
CRWD
$190B
| $27.9M | 0.05% |
6,104
-268
| -4% | -$14.2K |
|
227
PUT
Chewy
CHWY
$8.79B
| $27.5M | 0.05% |
3,246
-60
| -2% | -$5.84K |
|
228
PUT
Lucid Motors
LCID
$2.78B
| $27.4M | 0.05% |
+1,182
| New | +$316K |
|
229
PUT
Spotify
SPOT
$98.1B
| $27.1M | 0.05% |
1,012
-186
| -16% | -$58K |
|
230
CALL
Lyft
LYFT
$5.66B
| $27.1M | 0.05% |
+4,285
| New | +$239K |
|
231
PUT
Oracle
ORCL
$362B
| $27.1M | 0.05% |
3,856
+816
| +27% | +$52.8K |
|
|
PARA
232
DELISTED
Paramount Global Class B
PARA
| $27M | 0.05% |
597,826
+516,407
| +634% | +$31.5M |
|
233
PUT
Gaotu Techedu
GOTU
$398M
| $26.8M | 0.05% |
7,911
+2,944
| +59% | +$240K |
|
234
PUT
Direxion Daily Technology Bull 3x ETF
TECL
$5.64B
| $26.8M | 0.05% |
9,427
-32,853
| -78% | -$1.37M |
|
235
PUT
Hilton Worldwide
HLT
$74.2B
| $26.4M | 0.05% |
2,182
-39
| -2% | -$4.51K |
|
236
CALL
Norwegian Cruise Line
NCLH
$8.99B
| $26.2M | 0.05% |
9,492
+433
| +5% | +$11.5K |
|
237
CALL
Pinduoduo
PDD
$118B
| $26.1M | 0.05% |
+1,946
| New | +$329K |
|
238
PUT
American Tower
AMT
$77.1B
| $25.8M | 0.05% |
1,080
+336
| +45% | +$74.8K |
|
239
CALL
American Express
AXP
$238B
| $25.6M | 0.05% |
1,813
-1,563
| -46% | -$207K |
|
240
CALL
Elevance Health
ELV
$84.9B
| $25.6M | 0.05% |
713
+293
| +70% | +$94.2K |
|
|
241
PUT
Norwegian Cruise Line
NCLH
$8.99B
| $25.4M | 0.05% |
9,203
+955
| +12% | +$25.4K |
|
242
CALL
Marathon Digital Holdings
MARA
$4.75B
| $25.3M | 0.05% |
5,279
+1,407
| +36% | +$43.6K |
|
243
CALL
Marathon Petroleum
MPC
$93.3B
| $25.2M | 0.05% |
4,709
-805
| -15% | -$40.7K |
|
244
CALL
Wayfair
W
$11.3B
| $25M | 0.05% |
795
-560
| -41% | -$165K |
|
245
PUT
Wynn Resorts
WYNN
$9.85B
| $25M | 0.04% |
1,992
-2,952
| -60% | -$356K |
|
246
PUT
Thermo Fisher Scientific
TMO
$194B
| $24.5M | 0.04% |
536
-38
| -7% | -$18.1K |
|
247
Strategy Inc
MSTR
$36.1B
| $24.2M | 0.04% |
357,160
+81,060
| +29% | +$5.73M |
|
|
FISV
248
CALL
Fiserv Inc
FISV
$26.8B
| $24M | 0.04% |
+2,018
| New | +$232K |
|
249
CALL
Cloudflare
NET
$95.1B
| $23.9M | 0.04% |
+3,405
| New | +$262K |
|
|
250
CALL
Chewy
CHWY
$8.79B
| $23.5M | 0.04% |
2,773
+597
| +27% | +$58.1K |
|
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.