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 | |
|---|---|---|---|---|---|---|
9226
CALL
GameStop
GME
$9.5B
| – | – |
-12,052
| Closed | -$5.68M |
|
|
9227
GameStop
GME
$9.5B
| $0 | ﹤0.01% |
1,400
+600
| +75% | +$17.7K |
|
|
9228
PUT
GameStop
GME
$9.5B
| – | – |
-10,292
| Closed | -$4.85M |
|
9229
Global Net Lease
GNL
$1.87B
| – | – |
-2,771
| Closed | -$49.1K |
|
9230
PUT
Genasys
GNSS
$75.6M
| – | – |
-14
| Closed | -$9K |
|
9231
CALL
Gogo Inc
GOGO
$515M
| – | – |
-2,935
| Closed | -$2.83M |
|
|
9232
Gogo Inc
GOGO
$515M
| $0 | ﹤0.01% |
33
-29,785
| -100% | -$354K |
|
|
9233
PUT
Gogo Inc
GOGO
$515M
| – | – |
-2,286
| Closed | -$2.2M |
|
|
B
9234
CALL
Barrick Mining
B
$62.2B
| – | – |
-5,948
| Closed | -$13.5M |
|
|
B
9235
Barrick Mining
B
$62.2B
| $0 | ﹤0.01% |
533,036
+93,003
| +21% | +$2M |
|
|
B
9236
PUT
Barrick Mining
B
$62.2B
| – | – |
-11,784
| Closed | -$26.8M |
|
|
9237
Alphabet (Google) Class C
GOOG
$3.9T
| – | – |
-434,640
| Closed | -$38.1M |
|
|
GP
9238
GreenPower Motor Co
GP
$10.5M
| – | – |
-592
| Closed | -$162K |
|
9239
CALL
GoPro
GPRO
$116M
| – | – |
-2,159
| Closed | -$1.79M |
|
|
9240
GoPro
GPRO
$116M
| – | – |
-21,636
| Closed | -$204K |
|
|
9241
PUT
GoPro
GPRO
$116M
| – | – |
-1,481
| Closed | -$1.23M |
|
9242
Groupon
GRPN
$980M
| – | – |
-32,889
| Closed | -$1.42M |
|
9243
GrowGeneration
GRWG
$82.9M
| – | – |
-61,059
| Closed | -$3.05M |
|
9244
Goosehead Insurance
GSHD
$1.39B
| – | – |
-270
| Closed | -$36.5K |
|
9245
Gran Tierra Energy
GTE
$260M
| $0 | ﹤0.01% |
2,837
+2,827
| +28,270% | +$20.2K |
|
|
GTLS
9246
CALL
DELISTED
Chart Industries
GTLS
| – | – |
-80
| Closed | -$942K |
|
|
GTLS
9247
DELISTED
Chart Industries
GTLS
| $0 | ﹤0.01% |
+575
| New | +$81.2K |
|
|
GTLS
9248
PUT
DELISTED
Chart Industries
GTLS
| – | – |
-6
| Closed | -$70K |
|
9249
CALL
Gray Television
GTN
$407M
| – | – |
-147
| Closed | -$262K |
|
|
9250
Gray Television
GTN
$407M
| $0 | ﹤0.01% |
641
-9,359
| -94% | -$173K |
|
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.