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 | |
|---|---|---|---|---|---|---|
1726
EPR Properties
EPR
$4.86B
| $1.8M | ﹤0.01% |
38,613
+15,009
| +64% | +$633K |
|
1727
PG&E
PCG
$47.8B
| $1.8M | ﹤0.01% |
153,458
-158,730
| -51% | -$1.84M |
|
1728
PUT
Momentus
MNTS
$88.7M
| – | – |
0
| – | – |
|
1729
CALL
PetMed Express
PETS
$42.5M
| $1.79M | ﹤0.01% |
510
+266
| +109% | +$9.25K |
|
1730
CALL
AllianceBernstein
AB
$3.47B
| $1.79M | ﹤0.01% |
448
-301
| -40% | -$11.3K |
|
1731
iShares MSCI USA Momentum Factor ETF
MTUM
$25.5B
| $1.79M | ﹤0.01% |
11,128
+10,255
| +1,175% | +$1.7M |
|
|
SEE
1732
CALL
DELISTED
Sealed Air
SEE
| $1.79M | ﹤0.01% |
390
+92
| +31% | +$4.11K |
|
1733
CALL
Federal Realty Investment Trust
FRT
$10.9B
| $1.78M | ﹤0.01% |
176
+117
| +198% | +$11.3K |
|
|
TPGY
1734
PUT
DELISTED
TPG Pace Beneficial Finance Corp.
TPGY
| $1.78M | ﹤0.01% |
912
+826
| +960% | +$19.4K |
|
1735
PUT
Brunswick
BC
$5.19B
| $1.78M | ﹤0.01% |
187
+88
| +89% | +$8.06K |
|
1736
PUT
Yum China
YUMC
$14.9B
| $1.78M | ﹤0.01% |
301
-36
| -11% | -$2.15K |
|
1737
CALL
Rockwell Automation
ROK
$51.4B
| $1.78M | ﹤0.01% |
+67
| New | +$17.1K |
|
1738
CALL
Entegris
ENTG
$19.7B
| $1.78M | ﹤0.01% |
159
-50
| -24% | -$5.15K |
|
|
FIRY
1739
Firy Inc
FIRY
$127M
| $1.78M | ﹤0.01% |
4,668
+4,079
| +693% | +$2.34M |
|
|
1740
PUT
EPR Properties
EPR
$4.86B
| $1.77M | ﹤0.01% |
381
-1,208
| -76% | -$50.9K |
|
1741
CALL
Honda
HMC
$36.5B
| $1.77M | ﹤0.01% |
588
+567
| +2,700% | +$16.3K |
|
|
HZON
1742
DELISTED
Horizon Acquisition Corporation II
HZON
| $1.77M | ﹤0.01% |
+174,070
| New | +$1.85M |
|
|
SRG
1743
PUT
Seritage Growth Properties
SRG
$130M
| $1.77M | ﹤0.01% |
967
-7
| -0.7% | -$130 |
|
1744
Steel Dynamics
STLD
$35.6B
| $1.77M | ﹤0.01% |
+34,965
| New | +$1.47M |
|
|
SOL
1745
CALL
DELISTED
Emeren Group
SOL
| $1.77M | ﹤0.01% |
1,438
+1,081
| +303% | +$19.7K |
|
1746
CALL
Tandem Diabetes Care
TNDM
$1.17B
| $1.77M | ﹤0.01% |
201
-335
| -63% | -$31.1K |
|
1747
CALL
Chemours
CC
$2.59B
| $1.77M | ﹤0.01% |
634
-365
| -37% | -$9.71K |
|
|
LKFT
1748
CALL
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.82B
| $1.76M | ﹤0.01% |
+229
| New | +$21.1K |
|
|
RPAI
1749
CALL
DELISTED
RETAIL PROPERTIES OF AMERICA, INC.
RPAI
| $1.76M | ﹤0.01% |
1,679
+887
| +112% | +$9.06K |
|
1750
GoDaddy
GDDY
$12.3B
| $1.76M | ﹤0.01% |
22,639
+3,376
| +18% | +$272K |
|
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.