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 | |
|---|---|---|---|---|---|---|
1451
CALL
Sempra
SRE
$60.8B
| $2.33M | ﹤0.01% |
352
+270
| +329% | +$16.8K |
|
|
NGA
1452
CALL
DELISTED
Northern Genesis Acquisition Corp.
NGA
| $2.33M | ﹤0.01% |
1,428
+720
| +102% | +$16.1K |
|
|
GOEV
1453
CALL
DELISTED
Canoo Inc. Class A Common Stock
GOEV
| $2.33M | ﹤0.01% |
6
+1
| +20% | +$6.86K |
|
|
ELMS
1454
PUT
DELISTED
Electric Last Mile Solutions, Inc. Class A Common stock
ELMS
| $2.32M | ﹤0.01% |
+2,328
| New | +$27.3K |
|
1455
PUT
Celsius Holdings
CELH
$6.93B
| $2.32M | ﹤0.01% |
1,449
+648
| +81% | +$12.2K |
|
1456
PUT
Corsair Gaming
CRSR
$1.05B
| $2.32M | ﹤0.01% |
697
+11
| +2% | +$409 |
|
|
RP
1457
CALL
DELISTED
RealPage, Inc.
RP
| $2.32M | ﹤0.01% |
266
-201
| -43% | -$17.5K |
|
1458
PUT
Toll Brothers
TOL
$14B
| $2.31M | ﹤0.01% |
408
-291
| -42% | -$15.2K |
|
|
CERN
1459
CALL
DELISTED
Cerner Corp
CERN
| $2.31M | ﹤0.01% |
322
-281
| -47% | -$21.1K |
|
1460
CALL
Knight Transportation
KNX
$11.8B
| $2.31M | ﹤0.01% |
481
+217
| +82% | +$9.52K |
|
|
MFA
1461
PUT
MFA Financial
MFA
$929M
| $2.31M | ﹤0.01% |
1,420
-698
| -33% | -$11.1K |
|
1462
Cummins
CMI
$91.7B
| $2.31M | ﹤0.01% |
8,900
+8,306
| +1,398% | +$2.08M |
|
1463
CALL
Telephone and Data Systems
TDS
$3.91B
| $2.3M | ﹤0.01% |
1,003
+809
| +417% | +$16.5K |
|
1464
PUT
RLX Technology
RLX
$2.48B
| $2.3M | ﹤0.01% |
+2,218
| New | +$42.7K |
|
1465
PUT
KKR & Co
KKR
$89.2B
| $2.29M | ﹤0.01% |
470
-681
| -59% | -$30.5K |
|
|
HBI
1466
PUT
DELISTED
Hanesbrands
HBI
| $2.29M | ﹤0.01% |
1,163
+539
| +86% | +$9.54K |
|
1467
PUT
MasTec
MTZ
$26.7B
| $2.29M | ﹤0.01% |
244
+142
| +139% | +$12.2K |
|
1468
Wolfspeed
WOLF
$1.2B
| $2.28M | ﹤0.01% |
21,103
+9,215
| +78% | +$1.04M |
|
|
ACB
1469
CALL
Aurora Cannabis
ACB
$165M
| $2.28M | ﹤0.01% |
952
+47
| +5% | +$5.25K |
|
|
IPOD
1470
PUT
DELISTED
Social Capital Hedosophia Holdings Corp. IV
IPOD
| $2.27M | ﹤0.01% |
+2,075
| New | +$29.5K |
|
|
LFC
1471
PUT
DELISTED
China Life Insurance Company Ltd.
LFC
| $2.27M | ﹤0.01% |
2,185
+414
| +23% | +$4.48K |
|
1472
CALL
Zions Bancorporation
ZION
$10.1B
| $2.27M | ﹤0.01% |
413
-389
| -49% | -$20K |
|
1473
CALL
Fortive
FTV
$19B
| $2.27M | ﹤0.01% |
426
-30
| -7% | -$1.55K |
|
1474
CALL
MSCI
MSCI
$40B
| $2.26M | ﹤0.01% |
54
-18
| -25% | -$7.56K |
|
1475
CALL
Bakkt Inc
BKKT
$333M
| $2.26M | ﹤0.01% |
+70
| New | +$26.1K |
|
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.