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 | |
|---|---|---|---|---|---|---|
3526
Beazer Homes USA
BZH
$913M
| $446K | ﹤0.01% |
21,351
+11,843
| +125% | +$218K |
|
3527
CALL
Healthcare Realty
HR
$7.58B
| $446K | ﹤0.01% |
162
-193
| -54% | -$5.4K |
|
3528
PUT
Vanguard FTSE Developed Markets ETF
VEA
$225B
| $446K | ﹤0.01% |
91
-104
| -53% | -$5.08K |
|
|
GNMK
3529
CALL
DELISTED
GenMark Diagnostics, Inc
GNMK
| $446K | ﹤0.01% |
+187
| New | +$3.48K |
|
3530
MacroGenics
MGNX
$245M
| $445K | ﹤0.01% |
13,984
+12,833
| +1,115% | +$312K |
|
3531
Sasol
SSL
$7.03B
| $445K | ﹤0.01% |
30,751
-14,469
| -32% | -$185K |
|
3532
Dentsply Sirona
XRAY
$2.7B
| $445K | ﹤0.01% |
+6,977
| New | +$405K |
|
3533
CALL
YPF
YPF
$19.5B
| $445K | ﹤0.01% |
1,084
-962
| -47% | -$4.07K |
|
|
CNH
3534
CNH Industrial
CNH
$14.2B
| $445K | ﹤0.01% |
32,752
+32,522
| +14,140% | +$409K |
|
3535
Global X MSCI China Consumer Discretionary ETF
CHIQ
$128M
| $444K | ﹤0.01% |
13,279
+7,525
| +131% | +$285K |
|
3536
PUT
MGIC Investment
MTG
$6.47B
| $444K | ﹤0.01% |
321
+197
| +159% | +$2.51K |
|
3537
CALL
National Fuel Gas
NFG
$7.73B
| $444K | ﹤0.01% |
89
+28
| +46% | +$1.27K |
|
3538
PUT
Amcor
AMCR
$21.6B
| $443K | ﹤0.01% |
76
+38
| +100% | +$2.17K |
|
3539
CALL
Conduent
CNDT
$251M
| $443K | ﹤0.01% |
666
+129
| +24% | +$735 |
|
3540
Lumentum
LITE
$50.7B
| $443K | ﹤0.01% |
4,856
+2,362
| +95% | +$219K |
|
|
IEA
3541
PUT
DELISTED
Infrastructure and Energy Alternatives, Inc. Common Stock
IEA
| $443K | ﹤0.01% |
272
+221
| +433% | +$3.99K |
|
3542
PUT
East-West Bancorp
EWBC
$18B
| $442K | ﹤0.01% |
60
-143
| -70% | -$9.73K |
|
3543
Teradyne
TER
$50.2B
| $442K | ﹤0.01% |
+3,639
| New | +$457K |
|
|
ASTR
3544
PUT
DELISTED
Astra Space, Inc. Class A Common Stock
ASTR
| $442K | ﹤0.01% |
+25
| New | +$5.15K |
|
3545
CMS Energy
CMS
$23B
| $441K | ﹤0.01% |
7,205
+5,528
| +330% | +$318K |
|
3546
PUT
Gerdau
GGB
$9.72B
| $441K | ﹤0.01% |
1,042
-3
| -0.3% | -$11 |
|
3547
Yext
YEXT
$564M
| $441K | ﹤0.01% |
30,482
+12,086
| +66% | +$202K |
|
3548
Trex
TREX
$4.57B
| $440K | ﹤0.01% |
4,807
+4,534
| +1,661% | +$426K |
|
|
YSG
3549
Yatsen Holding
YSG
$322M
| $440K | ﹤0.01% |
7,131
+3,428
| +93% | +$312K |
|
|
FUV
3550
CALL
DELISTED
Arcimoto, Inc. Common Stock
FUV
| $440K | ﹤0.01% |
17
-12
| -41% | -$4.78K |
|
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.