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 | Miscellaneous | 97.22% |
| 2 | Technology | 0.66% |
| 3 | Consumer Discretionary | 0.49% |
| 4 | Healthcare | 0.33% |
| 5 | Financials | 0.3% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
126
CALL
Nike
NKE
$57B
| $55.1M | 0.1% |
4,632
+1,198
| +35% | +$167K |
|
127
CALL
Airbnb
ABNB
$107B
| $54.5M | 0.1% |
2,901
+1,756
| +153% | +$325K |
|
128
CALL
QuantumScape Corp
QS
$3.37B
| $53.5M | 0.1% |
11,966
+10,662
| +818% | +$559K |
|
129
PUT
Pinduoduo
PDD
$117B
| $53.2M | 0.1% |
+3,972
| New | +$671K |
|
130
PUT
PENN Entertainment
PENN
$2.29B
| $52.8M | 0.09% |
5,040
+618
| +14% | +$68.4K |
|
131
CALL
AbbVie
ABBV
$453B
| $52M | 0.09% |
4,807
+1,189
| +33% | +$127K |
|
132
PUT
Plug Power
PLUG
$3.03B
| $51.8M | 0.09% |
14,451
+6,648
| +85% | +$343K |
|
133
PUT
Morgan Stanley
MS
$342B
| $51.7M | 0.09% |
6,659
-145
| -2% | -$11.1K |
|
134
PUT
Eli Lilly
LLY
$1.02T
| $51.3M | 0.09% |
2,746
+1,769
| +181% | +$346K |
|
135
PUT
Futu Holdings
FUTU
$17.1B
| $50.2M | 0.09% |
3,162
+2,391
| +310% | +$296K |
|
136
PUT
Novavax
NVAX
$1.69B
| $49.4M | 0.09% |
2,726
-769
| -22% | -$153K |
|
137
PUT
Expedia Group
EXPE
$35.8B
| $49.4M | 0.09% |
+2,870
| New | +$442K |
|
138
PUT
DraftKings
DKNG
$11.9B
| $48.9M | 0.09% |
7,974
+1,531
| +24% | +$92K |
|
139
PUT
Moderna
MRNA
$58.1B
| $47.6M | 0.09% |
3,637
-2,514
| -41% | -$364K |
|
140
PUT
Marathon Digital Holdings
MARA
$4.37B
| $47.4M | 0.09% |
9,881
+6,529
| +195% | +$202K |
|
141
PUT
iShares MSCI Australia ETF
EWA
$1.34B
| $46.9M | 0.08% |
41,530
+10,361
| +33% | +$258K |
|
142
CALL
Riot Platforms
RIOT
$8.18B
| $45.7M | 0.08% |
8,572
+2,253
| +36% | +$91.2K |
|
|
143
CALL
Moderna
MRNA
$58.1B
| $45.4M | 0.08% |
3,469
-809
| -19% | -$117K |
|
144
PUT
Verizon
VZ
$208B
| $45.2M | 0.08% |
7,776
+1,493
| +24% | +$84.3K |
|
145
PUT
Texas Instruments
TXN
$236B
| $44.8M | 0.08% |
+2,369
| New | +$412K |
|
146
PUT
Lam Research
LRCX
$385B
| $44.5M | 0.08% |
7,480
+760
| +11% | +$41.4K |
|
147
PUT
Trade Desk
TTD
$6.78B
| $44.5M | 0.08% |
6,830
-1,680
| -20% | -$130K |
|
148
CALL
Vanguard S&P 500 ETF
VOO
$1.05T
| $44.4M | 0.08% |
2,214
-425
| -16% | -$151K |
|
149
PUT
Comcast
CMCSA
$94B
| $44.1M | 0.08% |
8,146
-2,858
| -26% | -$151K |
|
|
150
CALL
Comcast
CMCSA
$94B
| $43.3M | 0.08% |
8,004
-707
| -8% | -$37.3K |
|
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's Q1 2021 filing shows 2,255 new, 3,360 increased, 3,150 reduced and 1,707 closed positions. Its largest new stake was Pfizer: 464,628 shares worth $16.8M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Miscellaneous at 97% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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 2,255 new positions and closed 1,707 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.