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 | |
|---|---|---|---|---|---|---|
151
CALL
Morgan Stanley
MS
$340B
| $43M | 0.08% |
5,542
-2,005
| -27% | -$154K |
|
152
PUT
American Express
AXP
$240B
| $43M | 0.08% |
3,042
-1,400
| -32% | -$185K |
|
153
PUT
Merck
MRK
$312B
| $42.2M | 0.08% |
+5,741
| New | +$423K |
|
154
CALL
NextEra Energy
NEE
$183B
| $41.6M | 0.07% |
5,504
+200
| +4% | +$15.6K |
|
155
CALL
Eli Lilly
LLY
$1.02T
| $41.6M | 0.07% |
2,225
+629
| +39% | +$123K |
|
156
PUT
AT&T
T
$155B
| $41M | 0.07% |
17,927
-12,211
| -41% | -$270K |
|
157
CALL
PENN Entertainment
PENN
$2.84B
| $40.6M | 0.07% |
3,874
+852
| +28% | +$94.4K |
|
158
CALL
Twilio
TWLO
$31.2B
| $40.1M | 0.07% |
1,177
+613
| +109% | +$230K |
|
159
PUT
Deere & Co
DE
$158B
| $40.1M | 0.07% |
1,071
-543
| -34% | -$178K |
|
160
CALL
Oracle
ORCL
$366B
| $39.5M | 0.07% |
5,630
+1,661
| +42% | +$108K |
|
|
ATVI
161
CALL
DELISTED
Activision Blizzard
ATVI
| $39.3M | 0.07% |
4,231
+492
| +13% | +$46.3K |
|
162
PUT
PepsiCo
PEP
$184B
| $39.3M | 0.07% |
2,779
+799
| +40% | +$110K |
|
163
PUT
AbbVie
ABBV
$448B
| $39.2M | 0.07% |
3,618
-2,854
| -44% | -$305K |
|
164
CALL
Texas Instruments
TXN
$265B
| $38.7M | 0.07% |
+2,047
| New | +$356K |
|
165
CALL
Intuitive Surgical
ISRG
$124B
| $38.6M | 0.07% |
1,569
-66
| -4% | -$16.6K |
|
166
CALL
Expedia Group
EXPE
$31.8B
| $37.9M | 0.07% |
+2,202
| New | +$339K |
|
167
PUT
CVS Health
CVS
$137B
| $37.6M | 0.07% |
+5,002
| New | +$364K |
|
|
168
CALL
Deere & Co
DE
$158B
| $36.7M | 0.07% |
982
+720
| +275% | +$236K |
|
169
PUT
DoorDash
DASH
$81.9B
| $36.6M | 0.07% |
2,791
+2,311
| +481% | +$387K |
|
170
PUT
Etsy
ETSY
$7.97B
| $36.5M | 0.07% |
1,808
-1,645
| -48% | -$344K |
|
171
PUT
Riot Platforms
RIOT
$8.13B
| $36.3M | 0.07% |
6,809
+2,482
| +57% | +$100K |
|
172
CALL
Enphase Energy
ENPH
$5.26B
| $36.1M | 0.06% |
2,226
+441
| +25% | +$79.2K |
|
173
CALL
ServiceNow
NOW
$105B
| $36M | 0.06% |
3,600
-1,010
| -22% | -$107K |
|
174
PUT
Wayfair
W
$11.2B
| $35.9M | 0.06% |
1,140
-869
| -43% | -$256K |
|
|
DOCU
175
CALL
DocuSign
DOCU
$9.99B
| $35.9M | 0.06% |
+1,771
| New | +$411K |
|
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.