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 | |
|---|---|---|---|---|---|---|
1626
CALL
Targa Resources
TRGP
$60.4B
| $1.95M | ﹤0.01% |
614
-175
| -22% | -$5.4K |
|
1627
CALL
TC Energy
TRP
$73.5B
| $1.95M | ﹤0.01% |
606
+301
| +99% | +$13.3K |
|
1628
CALL
Silicon Laboratories
SLAB
$7.15B
| $1.95M | ﹤0.01% |
138
-111
| -45% | -$15.9K |
|
1629
PUT
LyondellBasell Industries
LYB
$19.5B
| $1.95M | ﹤0.01% |
187
-32
| -15% | -$3.18K |
|
1630
PUT
Schwab US Broad Market ETF
SCHB
$42.8B
| $1.94M | ﹤0.01% |
1,596
+666
| +72% | +$10.5K |
|
1631
CALL
Williams Companies
WMB
$90.5B
| $1.94M | ﹤0.01% |
818
-573
| -41% | -$13K |
|
1632
PUT
Exelon
EXC
$48.6B
| $1.93M | ﹤0.01% |
620
-71
| -10% | -$2.13K |
|
|
FITB
1633
Fifth Third Bancorp
FITB
$52B
| $1.93M | ﹤0.01% |
+51,629
| New | +$1.75M |
|
1634
PUT
Curis
CRIS
$9.53M
| $1.93M | ﹤0.01% |
4
+3
| +300% | +$12.5K |
|
1635
PUT
Playtika
PLTK
$1.4B
| $1.93M | ﹤0.01% |
+708
| New | +$20.8K |
|
1636
CALL
Enbridge
ENB
$124B
| $1.93M | ﹤0.01% |
529
+42
| +9% | +$1.48K |
|
|
MRSH
1637
CALL
Marsh
MRSH
$86.3B
| $1.92M | ﹤0.01% |
158
-94
| -37% | -$10.8K |
|
1638
Guardant Health
GH
$19.5B
| $1.92M | ﹤0.01% |
12,601
+10,048
| +394% | +$1.52M |
|
1639
PUT
Kimbell Royalty Partners
KRP
$1.47B
| $1.92M | ﹤0.01% |
1,896
+1,851
| +4,113% | +$17.9K |
|
1640
CALL
Perion Network
PERI
$367M
| $1.92M | ﹤0.01% |
1,074
-1,043
| -49% | -$18.8K |
|
|
CVAC
1641
PUT
DELISTED
CureVac
CVAC
| $1.92M | ﹤0.01% |
+210
| New | +$20.4K |
|
1642
CALL
Principal Financial Group
PFG
$23.6B
| $1.92M | ﹤0.01% |
320
+180
| +129% | +$10K |
|
|
HOME
1643
CALL
DELISTED
At Home Group Inc.
HOME
| $1.92M | ﹤0.01% |
668
-132
| -17% | -$3.32K |
|
|
ELMS
1644
DELISTED
Electric Last Mile Solutions, Inc. Class A Common stock
ELMS
| $1.92M | ﹤0.01% |
+192,189
| New | +$2.25M |
|
1645
CALL
Baker Hughes
BKR
$56.8B
| $1.91M | ﹤0.01% |
886
+141
| +19% | +$3.21K |
|
|
THBR
1646
CALL
DELISTED
Thunder Bridge Acquisition II, Ltd. Class A Ordinary Shares
THBR
| $1.91M | ﹤0.01% |
+1,837
| New | +$21.3K |
|
1647
CALL
iShares Convertible Bond ETF
ICVT
$7.23B
| $1.91M | ﹤0.01% |
745
-143
| -16% | -$14.7K |
|
1648
PUT
First Horizon
FHN
$12.1B
| $1.91M | ﹤0.01% |
1,131
+263
| +30% | +$4.16K |
|
1649
CALL
Mattel
MAT
$4.17B
| $1.91M | ﹤0.01% |
959
+107
| +13% | +$2.07K |
|
1650
CALL
Levi Strauss
LEVI
$9.44B
| $1.91M | ﹤0.01% |
797
-298
| -27% | -$6.67K |
|
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.