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 | |
|---|---|---|---|---|---|---|
1076
lululemon athletica
LULU
$13B
| $3.64M | 0.01% |
11,868
-22,100
| -65% | -$7.25M |
|
1077
CALL
Aemetis
AMTX
$119M
| $3.64M | 0.01% |
1,484
+1,440
| +3,273% | +$16.1K |
|
1078
PUT
Tradeweb Markets
TW
$21.3B
| $3.63M | 0.01% |
491
-115
| -19% | -$7.9K |
|
|
DM
1079
PUT
DELISTED
Desktop Metal, Inc.
DM
| $3.63M | 0.01% |
244
+76
| +45% | +$16.7K |
|
|
UPH
1080
CALL
DELISTED
UpHealth, Inc.
UPH
| $3.63M | 0.01% |
362
+163
| +82% | +$16.9K |
|
1081
NetEase
NTES
$76.5B
| $3.62M | 0.01% |
35,050
+16,876
| +93% | +$1.91M |
|
1082
CALL
Realty Income
O
$61.2B
| $3.62M | 0.01% |
588
+290
| +97% | +$17.2K |
|
|
MAXR
1083
CALL
DELISTED
Maxar Technologies Inc. Common Stock
MAXR
| $3.62M | 0.01% |
956
+176
| +23% | +$7.84K |
|
1084
CALL
M&T Bank
MTB
$36.2B
| $3.61M | 0.01% |
238
-382
| -62% | -$56.3K |
|
1085
PUT
Diageo
DEO
$46.2B
| $3.6M | 0.01% |
219
-47
| -18% | -$7.69K |
|
1086
PUT
CRISPR Therapeutics
CRSP
$4.58B
| $3.59M | 0.01% |
295
-118
| -29% | -$17.8K |
|
1087
CALL
Raymond James Financial
RJF
$32.5B
| $3.59M | 0.01% |
440
+3
| +0.7% | +$224 |
|
1088
PUT
Paycom
PAYC
$6.78B
| $3.59M | 0.01% |
97
-263
| -73% | -$104K |
|
1089
CALL
Invesco Aerospace & Defense ETF
PPA
$8.27B
| $3.57M | 0.01% |
382
+198
| +108% | +$13.7K |
|
1090
CALL
Schwab US Broad Market ETF
SCHB
$42.8B
| $3.56M | 0.01% |
2,928
+1,536
| +110% | +$24.2K |
|
1091
CALL
Renaissance IPO ETF
IPO
$154M
| $3.56M | 0.01% |
573
+442
| +337% | +$29.8K |
|
1092
CALL
H&R Block
HRB
$5.18B
| $3.56M | 0.01% |
1,632
+1,285
| +370% | +$24.3K |
|
1093
Medtronic
MDT
$107B
| $3.55M | 0.01% |
30,086
-55,765
| -65% | -$6.54M |
|
1094
PUT
TMC The Metals Company
TMC
$1.59B
| $3.55M | 0.01% |
+3,580
| New | +$38.9K |
|
1095
CALL
Keurig Dr Pepper
KDP
$40.4B
| $3.55M | 0.01% |
1,034
+376
| +57% | +$12.2K |
|
1096
PUT
FIVE9
FIVN
$1.77B
| $3.55M | 0.01% |
227
-16
| -7% | -$2.73K |
|
1097
CALL
Mirion Technologies
MIR
$4.05B
| $3.55M | 0.01% |
+3,400
| New | +$39.9K |
|
1098
PUT
Eastman Chemical
EMN
$7.8B
| $3.53M | 0.01% |
321
-17
| -5% | -$1.85K |
|
1099
CALL
Old Dominion Freight Line
ODFL
$48.5B
| $3.53M | 0.01% |
294
+186
| +172% | +$20K |
|
|
AYX
1100
CALL
DELISTED
Alteryx Inc
AYX
| $3.53M | 0.01% |
426
-343
| -45% | -$36.3K |
|
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 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.