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 | |
|---|---|---|---|---|---|---|
1301
Builders FirstSource
BLDR
$7.84B
| $2.71M | ﹤0.01% |
58,359
+54,998
| +1,636% | +$2.34M |
|
1302
CALL
Neurocrine Biosciences
NBIX
$17.7B
| $2.7M | ﹤0.01% |
278
+43
| +18% | +$4.51K |
|
1303
PUT
SAP
SAP
$187B
| $2.7M | ﹤0.01% |
220
-214
| -49% | -$27.1K |
|
1304
PUT
America Movil
AMX
$78.1B
| $2.7M | ﹤0.01% |
1,988
-112
| -5% | -$1.54K |
|
1305
CALL
Petco
WOOF
$745M
| $2.7M | ﹤0.01% |
+1,218
| New | +$29K |
|
1306
CALL
Groupon
GRPN
$980M
| $2.7M | ﹤0.01% |
534
-421
| -44% | -$18.2K |
|
1307
PUT
TE Connectivity
TEL
$58.8B
| $2.7M | ﹤0.01% |
209
+4
| +2% | +$514 |
|
|
FFAI
1308
PUT
Faraday Future Intelligent Electric
FFAI
$15.8M
| – | – |
0
| – | – |
|
1309
CALL
Canadian Pacific Kansas City
CP
$82B
| $2.69M | ﹤0.01% |
355
+145
| +69% | +$10.4K |
|
1310
PUT
MicroSectors FANG+ ETNs due Jan 8 2038
FNGS
$542M
| $2.69M | ﹤0.01% |
948
+780
| +464% | +$22.8K |
|
1311
Zillow
Z
$7.04B
| $2.68M | ﹤0.01% |
+20,709
| New | +$3.07M |
|
1312
CALL
Western Union
WU
$2.57B
| $2.68M | ﹤0.01% |
1,086
+355
| +49% | +$8.36K |
|
|
MNDT
1313
CALL
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $2.68M | ﹤0.01% |
1,368
-3,280
| -71% | -$68.5K |
|
1314
CALL
KLA
KLAC
$275B
| $2.68M | ﹤0.01% |
810
-2,150
| -73% | -$64.8K |
|
1315
PUT
Texas Roadhouse
TXRH
$12.7B
| $2.68M | ﹤0.01% |
279
+65
| +30% | +$5.68K |
|
1316
PUT
Howard Hughes
HHH
$3.93B
| $2.67M | ﹤0.01% |
295
-166
| -36% | -$14.6K |
|
1317
CALL
Darling Ingredients
DAR
$9.93B
| $2.67M | ﹤0.01% |
363
-163
| -31% | -$11.2K |
|
1318
PUT
New York Times
NYT
$11.6B
| $2.67M | ﹤0.01% |
527
-501
| -49% | -$25.1K |
|
1319
PUT
Teradyne
TER
$54.8B
| $2.66M | ﹤0.01% |
219
-751
| -77% | -$94.4K |
|
1320
CALL
Cerence
CRNC
$382M
| $2.66M | ﹤0.01% |
297
-258
| -46% | -$28.4K |
|
|
SAGE
1321
DELISTED
Sage Therapeutics
SAGE
| $2.65M | ﹤0.01% |
35,473
+31,751
| +853% | +$2.6M |
|
1322
CALL
Domo
DOMO
$166M
| $2.65M | ﹤0.01% |
+471
| New | +$30.6K |
|
1323
CALL
Equity Residential
EQR
$25.4B
| $2.65M | ﹤0.01% |
370
-1,874
| -84% | -$124K |
|
|
CLVR
1324
CALL
DELISTED
Clever Leaves Holdings Inc. Common Shares
CLVR
| $2.65M | ﹤0.01% |
+86
| New | +$31.4K |
|
1325
CALL
Unilever
UL
$131B
| $2.65M | ﹤0.01% |
+421
| New | +$26.8K |
|
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.