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 | |
|---|---|---|---|---|---|---|
176
PUT
Blackrock
BLK
$163B
| $35.8M | 0.06% |
475
+96
| +25% | +$69.6K |
|
177
CALL
Teladoc Health
TDOC
$1.75B
| $35.5M | 0.06% |
1,954
-266
| -12% | -$61.7K |
|
178
CALL
Bilibili
BILI
$7.64B
| $35.5M | 0.06% |
3,317
-49
| -1% | -$5.99K |
|
179
PUT
XPeng
XPEV
$12.8B
| $35.3M | 0.06% |
9,660
+3,469
| +56% | +$144K |
|
180
CALL
Strategy Inc
MSTR
$37B
| $35M | 0.06% |
5,160
+1,240
| +32% | +$87.6K |
|
181
CALL
PepsiCo
PEP
$184B
| $34.6M | 0.06% |
2,448
+631
| +35% | +$86.6K |
|
182
PUT
Bristol-Myers Squibb
BMY
$124B
| $34.6M | 0.06% |
5,481
-801
| -13% | -$49.8K |
|
|
SHNY
183
CALL
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $34.4M | 0.06% |
11,311
+3,121
| +38% | +$9.5M |
|
184
CALL
Plug Power
PLUG
$3.17B
| $34.4M | 0.06% |
9,602
+2,170
| +29% | +$112K |
|
185
CALL
Rocket Companies
RKT
$38.6B
| $34.3M | 0.06% |
14,856
+10,402
| +234% | +$233K |
|
186
PUT
Skyworks Solutions
SWKS
$8.99B
| $34M | 0.06% |
1,853
+151
| +9% | +$26.2K |
|
187
CALL
CVS Health
CVS
$137B
| $33.6M | 0.06% |
+4,471
| New | +$326K |
|
188
CALL
Tilray
TLRY
$523M
| $33.6M | 0.06% |
1,479
+766
| +107% | +$180K |
|
189
PUT
CrowdStrike
CRWD
$195B
| $33.4M | 0.06% |
7,320
-3,908
| -35% | -$207K |
|
190
PUT
Zillow
Z
$7.56B
| $33.3M | 0.06% |
2,566
+868
| +51% | +$129K |
|
191
CALL
Futu Holdings
FUTU
$14.5B
| $33.2M | 0.06% |
2,088
+1,266
| +154% | +$157K |
|
192
PUT
Zscaler
ZS
$24B
| $33.1M | 0.06% |
1,930
-625
| -24% | -$124K |
|
193
PUT
Ford
F
$56.9B
| $32.8M | 0.06% |
26,807
+12,986
| +94% | +$149K |
|
194
PUT
Enphase Energy
ENPH
$5.26B
| $32.8M | 0.06% |
2,024
-102
| -5% | -$18.3K |
|
195
PUT
Vanguard S&P 500 ETF
VOO
$981B
| $32.5M | 0.06% |
1,509
-3,196
| -68% | -$1.13M |
|
|
196
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $32.3M | 0.06% |
97,753
+97,303
| +21,623% | +$30.7M |
|
|
197
PUT
Rocket Companies
RKT
$38.6B
| $32.2M | 0.06% |
13,964
+9,232
| +195% | +$206K |
|
198
PUT
Lyft
LYFT
$5.86B
| $32.1M | 0.06% |
+5,079
| New | +$284K |
|
199
PUT
Marriott International
MAR
$97B
| $32.1M | 0.06% |
2,164
-1,468
| -40% | -$200K |
|
200
PUT
Lockheed Martin
LMT
$117B
| $31.9M | 0.06% |
864
-418
| -33% | -$143K |
|
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.