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 | |
|---|---|---|---|---|---|---|
|
DMYD
1651
CALL
DELISTED
dMY Technology Group, Inc. II
DMYD
| $1.9M | ﹤0.01% |
+1,295
| New | +$23K |
|
|
SPR
1652
DELISTED
Spirit AeroSystems
SPR
| $1.9M | ﹤0.01% |
+39,123
| New | +$1.67M |
|
1653
American Express
AXP
$223B
| $1.9M | ﹤0.01% |
13,454
-2,716
| -17% | -$359K |
|
1654
BHP
BHP
$213B
| $1.9M | ﹤0.01% |
+30,695
| New | +$1.98M |
|
1655
Huntsman Corp
HUN
$2.24B
| $1.9M | ﹤0.01% |
+65,857
| New | +$1.84M |
|
1656
PUT
Xos
XOS
$27.7M
| $1.9M | ﹤0.01% |
+64
| New | +$20.8K |
|
1657
Five Below
FIVE
$11.2B
| $1.89M | ﹤0.01% |
9,916
-5,960
| -38% | -$1.12M |
|
1658
CALL
Wyndham Hotels & Resorts
WH
$5.46B
| $1.89M | ﹤0.01% |
271
+53
| +24% | +$3.38K |
|
|
AUY
1659
PUT
DELISTED
Yamana Gold, Inc.
AUY
| $1.89M | ﹤0.01% |
4,356
+1,974
| +83% | +$9.42K |
|
1660
PUT
Tower Semiconductor
TSEM
$26.4B
| $1.89M | ﹤0.01% |
674
-864
| -56% | -$25.5K |
|
|
QLTB
1661
PUT
DELISTED
ISHARES BAA BA RATED CORP BOND FUND
QLTB
| $1.89M | ﹤0.01% |
122
+88
| +259% | +$1.36M |
|
1662
Whirlpool
WHR
$2.42B
| $1.89M | ﹤0.01% |
8,559
+337
| +4% | +$66.9K |
|
1663
PUT
Schrodinger
SDGR
$1.12B
| $1.88M | ﹤0.01% |
+247
| New | +$22.2K |
|
|
MRTX
1664
PUT
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $1.88M | ﹤0.01% |
110
+35
| +47% | +$6.93K |
|
|
PSTH
1665
DELISTED
Pershing Square Tontine Holdings, Ltd.
PSTH
| $1.88M | ﹤0.01% |
78,439
-137,042
| -64% | -$3.84M |
|
1666
CALL
Xylem
XYL
$28.5B
| $1.88M | ﹤0.01% |
179
+73
| +69% | +$7.4K |
|
1667
PUT
WEC Energy
WEC
$37.7B
| $1.88M | ﹤0.01% |
201
-81
| -29% | -$7.06K |
|
|
XENT
1668
PUT
DELISTED
Intersect ENT, Inc
XENT
| $1.88M | ﹤0.01% |
901
+628
| +230% | +$14.5K |
|
|
ESPR
1669
PUT
DELISTED
Esperion Therapeutics
ESPR
| $1.88M | ﹤0.01% |
670
+416
| +164% | +$12.3K |
|
|
NGA
1670
PUT
DELISTED
Northern Genesis Acquisition Corp.
NGA
| $1.88M | ﹤0.01% |
1,151
+1,116
| +3,189% | +$24.9K |
|
1671
PUT
Omnicom Group
OMC
$22.7B
| $1.88M | ﹤0.01% |
253
-555
| -69% | -$38.3K |
|
1672
CALL
Nerdy
NRDY
$107M
| $1.87M | ﹤0.01% |
+1,892
| New | +$20.6K |
|
1673
The RealReal
REAL
$1.34B
| $1.87M | ﹤0.01% |
82,719
+75,388
| +1,028% | +$1.85M |
|
1674
CALL
FMC
FMC
$1.42B
| $1.87M | ﹤0.01% |
169
+14
| +9% | +$1.55K |
|
1675
CALL
Ameresco
AMRC
$1.15B
| $1.87M | ﹤0.01% |
384
-31
| -7% | -$1.71K |
|
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.