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 | |
|---|---|---|---|---|---|---|
|
BIG
1326
CALL
DELISTED
Big Lots, Inc.
BIG
| $2.64M | ﹤0.01% |
387
+111
| +40% | +$6.63K |
|
|
WWE
1327
CALL
DELISTED
World Wrestling Entertainment
WWE
| $2.64M | ﹤0.01% |
487
+426
| +698% | +$22.4K |
|
|
OSH
1328
CALL
DELISTED
Oak Street Health, Inc.
OSH
| $2.64M | ﹤0.01% |
487
+341
| +234% | +$19K |
|
1329
CALL
Beam Therapeutics
BEAM
$2.58B
| $2.64M | ﹤0.01% |
330
+300
| +1,000% | +$28.5K |
|
1330
CALL
eHealth
EHTH
$42.5M
| $2.64M | ﹤0.01% |
363
+186
| +105% | +$11.9K |
|
1331
CALL
Vera Bradley
VRA
$105M
| $2.64M | ﹤0.01% |
2,611
+1,227
| +89% | +$11.5K |
|
1332
Fluor
FLR
$7.29B
| $2.63M | ﹤0.01% |
113,726
-156,545
| -58% | -$3.04M |
|
1333
PUT
Silicon Motion
SIMO
$9.19B
| $2.62M | ﹤0.01% |
441
-547
| -55% | -$31.1K |
|
1334
CALL
JetBlue
JBLU
$1.96B
| $2.62M | ﹤0.01% |
1,287
-229
| -15% | -$3.97K |
|
1335
ARK Innovation ETF
ARKK
$5.89B
| $2.61M | ﹤0.01% |
21,794
+15,151
| +228% | +$2.05M |
|
1336
Centene
CNC
$31.3B
| $2.61M | ﹤0.01% |
40,912
-11,081
| -21% | -$686K |
|
1337
PUT
Enbridge
ENB
$124B
| $2.61M | ﹤0.01% |
718
+75
| +12% | +$2.64K |
|
1338
PUT
CleanSpark
CLSK
$3.73B
| $2.61M | ﹤0.01% |
1,096
+105
| +11% | +$2.96K |
|
1339
CALL
Vanguard Total Bond Market
BND
$157B
| $2.61M | ﹤0.01% |
308
-72
| -19% | -$6.21K |
|
1340
CALL
Radian Group
RDN
$5.14B
| $2.61M | ﹤0.01% |
1,121
+511
| +84% | +$10.9K |
|
1341
PUT
Edgewell Personal Care
EPC
$1.27B
| $2.6M | ﹤0.01% |
658
+425
| +182% | +$14.7K |
|
|
LOGC
1342
PUT
DELISTED
ContextLogic
LOGC
| $2.6M | ﹤0.01% |
55
+34
| +162% | +$22.5K |
|
1343
PUT
Franklin Resources
BEN
$16.9B
| $2.6M | ﹤0.01% |
880
+516
| +142% | +$14.1K |
|
|
PPL
1344
CALL
PPL Corp
PPL
$27.3B
| $2.6M | ﹤0.01% |
903
-1,193
| -57% | -$33.4K |
|
1345
CALL
Aramark
ARMK
$15B
| $2.6M | ﹤0.01% |
954
+507
| +113% | +$13.9K |
|
1346
RingCentral
RNG
$4.05B
| $2.6M | ﹤0.01% |
8,734
-6,929
| -44% | -$2.55M |
|
1347
PUT
Southern Company
SO
$110B
| $2.6M | ﹤0.01% |
418
-661
| -61% | -$39.6K |
|
|
ATIP
1348
CALL
DELISTED
ATI Physical Therapy, Inc.
ATIP
| $2.6M | ﹤0.01% |
+52
| New | +$28.5K |
|
1349
PUT
J.M. Smucker
SJM
$12.6B
| $2.59M | ﹤0.01% |
205
-36
| -15% | -$4.25K |
|
1350
CALL
Teucrium Soybean Fund
SOYB
$57.2M
| $2.59M | ﹤0.01% |
1,505
-299
| -17% | -$6.19K |
|
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.