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 | |
|---|---|---|---|---|---|---|
1976
CALL
Omega Healthcare
OHI
$15.4B
| $1.45M | ﹤0.01% |
397
-490
| -55% | -$18K |
|
1977
CALL
Omnicom Group
OMC
$22.7B
| $1.45M | ﹤0.01% |
196
-1,085
| -85% | -$74.9K |
|
|
ARNC
1978
CALL
DELISTED
Arconic Corporation
ARNC
| $1.45M | ﹤0.01% |
572
+444
| +347% | +$11.9K |
|
|
VLDR
1979
PUT
DELISTED
Velodyne Lidar, Inc. Common Stock
VLDR
| $1.45M | ﹤0.01% |
1,274
+328
| +35% | +$6.17K |
|
1980
CALL
Alarm.com
ALRM
$2.56B
| $1.45M | ﹤0.01% |
168
+42
| +33% | +$3.96K |
|
1981
AvalonBay Communities
AVB
$27.1B
| $1.45M | ﹤0.01% |
7,861
+5,595
| +247% | +$978K |
|
|
NVTA
1982
DELISTED
Invitae Corporation
NVTA
| $1.45M | ﹤0.01% |
37,929
-42,477
| -53% | -$1.93M |
|
1983
PUT
Monolithic Power Systems
MPWR
$65.5B
| $1.45M | ﹤0.01% |
41
+40
| +4,000% | +$14.6K |
|
|
CTLT
1984
DELISTED
CATALENT, INC.
CTLT
| $1.45M | ﹤0.01% |
+13,753
| New | +$1.53M |
|
|
GTM
1985
CALL
ZoomInfo Technologies
GTM
$861M
| $1.45M | ﹤0.01% |
296
-290
| -49% | -$14.6K |
|
1986
CALL
VF Corp
VFC
$6.68B
| $1.45M | ﹤0.01% |
181
-354
| -66% | -$28.7K |
|
1987
Dollar General
DG
$25.9B
| $1.44M | ﹤0.01% |
7,130
-3,062
| -30% | -$608K |
|
1988
CALL
BorgWarner
BWA
$13.2B
| $1.44M | ﹤0.01% |
821
+135
| +20% | +$5.26K |
|
1989
PUT
Masco
MAS
$16B
| $1.44M | ﹤0.01% |
241
-234
| -49% | -$13.1K |
|
|
FINV
1990
PUT
FinVolution Group
FINV
$1.12B
| $1.44M | ﹤0.01% |
2,056
+1,923
| +1,446% | +$10.2K |
|
1991
PUT
Ribbon Communications
RBBN
$354M
| $1.44M | ﹤0.01% |
1,756
+139
| +9% | +$1.15K |
|
1992
Scorpio Tankers
STNG
$3.96B
| $1.44M | ﹤0.01% |
78,035
+42,726
| +121% | +$661K |
|
1993
PUT
FirstEnergy
FE
$28.9B
| $1.44M | ﹤0.01% |
415
-253
| -38% | -$8.26K |
|
1994
CALL
Quest Diagnostics
DGX
$25.1B
| $1.44M | ﹤0.01% |
112
-34
| -23% | -$4.19K |
|
1995
CALL
Protolabs
PRLB
$1.86B
| $1.44M | ﹤0.01% |
118
+99
| +521% | +$16.5K |
|
1996
PUT
McCormick & Company Non-Voting
MKC
$13.4B
| $1.44M | ﹤0.01% |
161
+49
| +44% | +$4.36K |
|
1997
PUT
8x8 Inc
EGHT
$247M
| $1.43M | ﹤0.01% |
442
-192
| -30% | -$6.64K |
|
1998
PUT
Moody's
MCO
$81.7B
| $1.43M | ﹤0.01% |
48
-31
| -39% | -$8.73K |
|
1999
Edwards Lifesciences
EW
$47.6B
| $1.43M | ﹤0.01% |
17,127
-9,438
| -36% | -$798K |
|
2000
CALL
Celsius Holdings
CELH
$6.93B
| $1.43M | ﹤0.01% |
894
-219
| -20% | -$4.11K |
|
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.