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 | |
|---|---|---|---|---|---|---|
101
CALL
Pfizer
PFE
$142B
| $71M | 0.13% |
21,540
-18,707
| -46% | -$664K |
|
102
PUT
Nike
NKE
$63.7B
| $71M | 0.13% |
5,345
+1,216
| +29% | +$169K |
|
103
CALL
DraftKings
DKNG
$11.8B
| $70.4M | 0.13% |
11,474
+2,999
| +35% | +$180K |
|
104
PUT
Pinterest
PINS
$12.8B
| $70.1M | 0.13% |
9,471
-269
| -3% | -$20K |
|
105
CALL
United Parcel Service
UPS
$96.2B
| $70M | 0.13% |
4,118
-1,777
| -30% | -$287K |
|
106
PUT
Teladoc Health
TDOC
$1.74B
| $69.3M | 0.12% |
3,812
+947
| +33% | +$220K |
|
107
CALL
Bank of America
BAC
$430B
| $69.2M | 0.12% |
17,875
-2,148
| -11% | -$74.1K |
|
108
PUT
Twilio
TWLO
$31.2B
| $68.8M | 0.12% |
2,018
-623
| -24% | -$233K |
|
|
109
CALL
Pinterest
PINS
$12.8B
| $68.1M | 0.12% |
9,196
+2,936
| +47% | +$218K |
|
110
CALL
Sea Limited
SE
$65.1B
| $67.9M | 0.12% |
+3,040
| New | +$706K |
|
111
PUT
Uber
UBER
$146B
| $67.3M | 0.12% |
+12,340
| New | +$689K |
|
112
CALL
Cisco
CSCO
$442B
| $66.5M | 0.12% |
+12,866
| New | +$604K |
|
113
CALL
Verizon
VZ
$182B
| $64.2M | 0.12% |
11,032
+4,097
| +59% | +$231K |
|
|
SPLK
114
CALL
DELISTED
Splunk Inc
SPLK
| $63.2M | 0.11% |
4,668
+2,539
| +119% | +$396K |
|
115
PUT
Airbnb
ABNB
$86B
| $61.9M | 0.11% |
3,292
+2,207
| +203% | +$409K |
|
116
PUT
Bilibili
BILI
$7.64B
| $61.8M | 0.11% |
5,774
+1,577
| +38% | +$193K |
|
117
PUT
ASML
ASML
$692B
| $60.4M | 0.11% |
978
+334
| +52% | +$185K |
|
|
118
PUT
United Parcel Service
UPS
$96.2B
| $59.7M | 0.11% |
3,514
-2,298
| -40% | -$372K |
|
|
DOCU
119
PUT
DocuSign
DOCU
$9.99B
| $59.3M | 0.11% |
+2,931
| New | +$680K |
|
120
PUT
Chevron
CVX
$381B
| $58.2M | 0.1% |
5,555
+123
| +2% | +$12K |
|
121
PUT
United Airlines
UAL
$38.2B
| $57.4M | 0.1% |
9,967
-248
| -2% | -$12.1K |
|
122
CALL
Peloton Interactive
PTON
$2.82B
| $57.1M | 0.1% |
5,075
-676
| -12% | -$89.7K |
|
123
CALL
American Airlines Group
AAL
$10.1B
| $56.9M | 0.1% |
23,793
+1,835
| +8% | +$35.4K |
|
124
CALL
Beyond Meat
BYND
$314M
| $56.4M | 0.1% |
+4,337
| New | +$638K |
|
125
PUT
RTX Corp
RTX
$262B
| $55.1M | 0.1% |
3,093
-1,370
| -31% | -$100K |
|
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.