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 | |
|---|---|---|---|---|---|---|
2651
Rapid7
RPD
$654M
| $824K | ﹤0.01% |
11,053
-10,525
| -49% | -$875K |
|
2652
Banco Bradesco
BBD
$38.4B
| $823K | ﹤0.01% |
+212,057
| New | +$814K |
|
2653
Atlanta Braves Holdings Series B
BATRK
$3.25B
| $822K | ﹤0.01% |
29,580
+13,053
| +79% | +$368K |
|
2654
Papa John's
PZZA
$1.02B
| $822K | ﹤0.01% |
9,276
+962
| +12% | +$90.9K |
|
2655
PUT
Eldorado Gold
EGO
$8.42B
| $821K | ﹤0.01% |
761
+52
| +7% | +$615 |
|
2656
PUT
Ingersoll Rand
IR
$33B
| $821K | ﹤0.01% |
167
+101
| +153% | +$4.67K |
|
|
SWCH
2657
CALL
DELISTED
Switch, Inc. Class A Common Stock
SWCH
| $821K | ﹤0.01% |
505
-92
| -15% | -$1.53K |
|
2658
CALL
Anterix
ATEX
$1.77B
| $820K | ﹤0.01% |
+174
| New | +$7.16K |
|
2659
PUT
JFrog
FROG
$9.82B
| $820K | ﹤0.01% |
185
-42
| -19% | -$2.42K |
|
|
MAPS
2660
PUT
DELISTED
WM TECHNOLOGY INC A
MAPS
| $820K | ﹤0.01% |
+447
| New | +$9.39K |
|
2661
PUT
NovoCure
NVCR
$2B
| $819K | ﹤0.01% |
62
-535
| -90% | -$84.6K |
|
2662
CALL
Telos
TLS
$346M
| $819K | ﹤0.01% |
+216
| New | +$7.61K |
|
2663
Protolabs
PRLB
$1.84B
| $818K | ﹤0.01% |
6,725
+5,926
| +742% | +$985K |
|
2664
CALL
Designer Brands
DBI
$295M
| $817K | ﹤0.01% |
470
+242
| +106% | +$3.04K |
|
2665
PUT
Kimco Realty
KIM
$17.9B
| $817K | ﹤0.01% |
436
-430
| -50% | -$7.59K |
|
|
DMTK
2666
PUT
DELISTED
DermTech, Inc. Common Stock
DMTK
| $817K | ﹤0.01% |
161
+120
| +293% | +$6.28K |
|
2667
PUT
Travere Therapeutics
TVTX
$5.28B
| $816K | ﹤0.01% |
327
+42
| +15% | +$1.16K |
|
|
BECN
2668
CALL
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $816K | ﹤0.01% |
156
-376
| -71% | -$17.5K |
|
|
2669
Anterix
ATEX
$1.77B
| $815K | ﹤0.01% |
17,288
+10,124
| +141% | +$417K |
|
2670
Direxion Daily Real Estate Bull 3X ETF
DRN
$48M
| $815K | ﹤0.01% |
51,491
+15,063
| +41% | +$209K |
|
2671
CALL
St. Joe Company
JOE
$3.53B
| $815K | ﹤0.01% |
190
+11
| +6% | +$526 |
|
|
FUV
2672
DELISTED
Arcimoto, Inc. Common Stock
FUV
| $815K | ﹤0.01% |
+3,083
| New | +$1.23M |
|
2673
Global X Uranium ETF
URA
$5.54B
| $814K | ﹤0.01% |
43,250
-7,706
| -15% | -$134K |
|
|
QTT
2674
PUT
DELISTED
Qutoutiao Inc. American Depositary Shares
QTT
| $814K | ﹤0.01% |
356
+335
| +1,595% | +$10.4K |
|
|
REGI
2675
DELISTED
Renewable Energy Group, Inc.
REGI
| $814K | ﹤0.01% |
12,327
-7,068
| -36% | -$606K |
|
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.