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 | |
|---|---|---|---|---|---|---|
|
ATNX
3476
PUT
DELISTED
Athenex, Inc. Common Stock
ATNX
| $466K | ﹤0.01% |
54
+52
| +2,600% | +$9.96K |
|
|
AIV
3477
PUT
Aimco
AIV
$375M
| $465K | ﹤0.01% |
770
-517
| -40% | -$2.62K |
|
3478
MarineMax
HZO
$782M
| $465K | ﹤0.01% |
9,438
+5,482
| +139% | +$259K |
|
3479
CALL
Xeris Biopharma Holdings
XERS
$1.42B
| $465K | ﹤0.01% |
1,032
-370
| -26% | -$2K |
|
|
RC
3480
CALL
Ready Capital
RC
$261M
| $464K | ﹤0.01% |
347
+106
| +44% | +$1.37K |
|
3481
Ternium
TX
$9.68B
| $464K | ﹤0.01% |
11,971
+2,004
| +20% | +$64.5K |
|
|
TBCH
3482
CALL
Turtle Beach Corp
TBCH
$258M
| $464K | ﹤0.01% |
+174
| New | +$4.76K |
|
|
SPAK
3483
DELISTED
Defiance Next Gen SPAC Derived ETF
SPAK
| $464K | ﹤0.01% |
+17,583
| New | +$532K |
|
3484
Fox Factory Holding Corp
FOXF
$801M
| $463K | ﹤0.01% |
3,644
+3,443
| +1,713% | +$444K |
|
|
TGNA
3485
CALL
DELISTED
TEGNA Inc
TGNA
| $463K | ﹤0.01% |
246
+87
| +55% | +$1.52K |
|
3486
Teucrium Wheat Fund
WEAT
$294M
| $463K | ﹤0.01% |
15,418
+9,721
| +171% | +$302K |
|
3487
CALL
FerroAtlántica
GSM
$628M
| $462K | ﹤0.01% |
1,224
+49
| +4% | +$146 |
|
3488
CALL
Malibu Boats
MBUU
$559M
| $462K | ﹤0.01% |
58
-245
| -81% | -$18.9K |
|
3489
Mercer International
MERC
$45.6M
| $462K | ﹤0.01% |
+32,165
| New | +$429K |
|
3490
PUT
Red Robin
RRGB
$139M
| $462K | ﹤0.01% |
116
-127
| -52% | -$3.84K |
|
|
ATSG
3491
PUT
DELISTED
Air Transport Services Group
ATSG
| $462K | ﹤0.01% |
158
-87
| -36% | -$2.47K |
|
3492
CALL
Advantage Solutions
ADV
$542M
| $461K | ﹤0.01% |
16
+9
| +129% | +$2.4K |
|
|
NEWR
3493
CALL
DELISTED
New Relic, Inc.
NEWR
| $461K | ﹤0.01% |
75
-151
| -67% | -$10K |
|
|
ZGNX
3494
DELISTED
Zogenix, Inc.
ZGNX
| $461K | ﹤0.01% |
23,618
+13,625
| +136% | +$279K |
|
3495
First Majestic Silver
AG
$7.75B
| $460K | ﹤0.01% |
29,549
+7,419
| +34% | +$119K |
|
3496
PUT
Cooper Companies
COO
$14.1B
| $460K | ﹤0.01% |
48
-12
| -20% | -$1.14K |
|
3497
EyePoint Inc
EYPT
$1B
| $460K | ﹤0.01% |
45,298
+42,614
| +1,588% | +$480K |
|
3498
CALL
Freshpet
FRPT
$3.01B
| $460K | ﹤0.01% |
29
-16
| -36% | -$2.41K |
|
|
NVRO
3499
PUT
DELISTED
NEVRO CORP.
NVRO
| $460K | ﹤0.01% |
33
+2
| +6% | +$326 |
|
|
AVTA
3500
DELISTED
Avantax, Inc. Common Stock
AVTA
| $460K | ﹤0.01% |
27,676
-72
| -0.3% | -$1.21K |
|
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.