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 | |
|---|---|---|---|---|---|---|
1376
CALL
Schrodinger
SDGR
$1.12B
| $2.51M | ﹤0.01% |
+329
| New | +$29.6K |
|
1377
CALL
Citizens Financial Group
CFG
$30.4B
| $2.5M | ﹤0.01% |
567
-56
| -9% | -$2.33K |
|
1378
PUT
Edison International
EIX
$30.7B
| $2.5M | ﹤0.01% |
427
-224
| -34% | -$13.1K |
|
|
SI
1379
CALL
DELISTED
Silvergate Capital Corporation
SI
| $2.5M | ﹤0.01% |
+176
| New | +$20.9K |
|
1380
PUT
Synchrony
SYF
$23.7B
| $2.5M | ﹤0.01% |
615
-1,274
| -67% | -$49.1K |
|
1381
CALL
Appian
APPN
$1.74B
| $2.5M | ﹤0.01% |
+188
| New | +$33.3K |
|
1382
PUT
Leggett & Platt
LEG
$1.52B
| $2.5M | ﹤0.01% |
547
+274
| +100% | +$12.2K |
|
1383
CALL
Public Storage
PSA
$60.2B
| $2.49M | ﹤0.01% |
101
-5
| -5% | -$1.16K |
|
1384
CALL
Purple Innovation
PRPL
$33.2M
| $2.49M | ﹤0.01% |
31
+10
| +48% | +$8.69K |
|
1385
TAL Education Group
TAL
$5.71B
| $2.48M | ﹤0.01% |
46,136
+7,023
| +18% | +$514K |
|
1386
CALL
ArcBest
ARCB
$3.44B
| $2.48M | ﹤0.01% |
352
+289
| +459% | +$16.7K |
|
|
PMT
1387
CALL
PennyMac Mortgage Investment
PMT
$849M
| $2.48M | ﹤0.01% |
1,263
+171
| +16% | +$3.17K |
|
|
TWO
1388
CALL
Two Harbors Investment
TWO
$1.27B
| $2.47M | ﹤0.01% |
844
+442
| +110% | +$12.1K |
|
|
CTLT
1389
PUT
DELISTED
CATALENT, INC.
CTLT
| $2.47M | ﹤0.01% |
235
+89
| +61% | +$9.93K |
|
1390
CALL
Qfin Holdings
QFIN
$1.61B
| $2.47M | ﹤0.01% |
951
+905
| +1,967% | +$20.2K |
|
1391
PUT
Tenaris
TS
$29.1B
| $2.47M | ﹤0.01% |
1,090
-218
| -17% | -$4.17K |
|
1392
CALL
Fluor
FLR
$7.29B
| $2.47M | ﹤0.01% |
1,071
+478
| +81% | +$9.29K |
|
|
BLUE
1393
DELISTED
bluebird bio
BLUE
| $2.47M | ﹤0.01% |
6,329
+2,183
| +53% | +$1.07M |
|
1394
ARK Genomic Revolution ETF
ARKG
$1.51B
| $2.47M | ﹤0.01% |
27,828
+18,815
| +209% | +$1.87M |
|
|
GBIO
1395
PUT
DELISTED
Generation Bio
GBIO
| $2.46M | ﹤0.01% |
+87
| New | +$27.8K |
|
1396
Johnson Controls International
JCI
$87.5B
| $2.46M | ﹤0.01% |
+41,228
| New | +$2.27M |
|
|
CLR
1397
PUT
DELISTED
CONTINENTAL RESOURCES INC.
CLR
| $2.46M | ﹤0.01% |
951
+396
| +71% | +$9.29K |
|
1398
CALL
Matador Resources
MTDR
$6.31B
| $2.45M | ﹤0.01% |
1,046
-343
| -25% | -$6.84K |
|
1399
Direxion Daily Technology Bull 3x ETF
TECL
$5.14B
| $2.45M | ﹤0.01% |
59,318
-4,502
| -7% | -$187K |
|
|
FRC
1400
CALL
DELISTED
First Republic Bank
FRC
| $2.45M | ﹤0.01% |
147
+113
| +332% | +$18.3K |
|
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.