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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4526
CALL
Vital Farms
VITL
$586M
| $395K | ﹤0.01% |
19,800
+19,640
| +12,275% | +$435K |
|
|
ARTY
4527
iShares Future AI & Tech ETF
ARTY
$3.21B
| $395K | ﹤0.01% |
8,806
-3,501
| -28% | -$151K |
|
4528
PUT
Ascendis Pharma A/S
ASND
$16.5B
| $394K | ﹤0.01% |
3,000
+2,978
| +13,536% | +$397K |
|
4529
Acuity Brands
AYI
$9.99B
| $394K | ﹤0.01% |
2,110
-2,887
| -58% | -$525K |
|
4530
PUT
Delek Logistics
DKL
$3.12B
| $394K | ﹤0.01% |
9,400
+9,358
| +22,281% | +$384K |
|
|
ETWO
4531
DELISTED
E2open Parent Holdings
ETWO
| $394K | ﹤0.01% |
+34,579
| New | +$398K |
|
|
BSQR
4532
PUT
DELISTED
BSQUARE Corporation
BSQR
| $394K | ﹤0.01% |
82,600
+82,407
| +42,698% | +$218K |
|
4533
Illinois Tool Works
ITW
$84.1B
| $393K | ﹤0.01% |
+1,761
| New | +$403K |
|
4534
CALL
Loop Industries
LOOP
$34.8M
| $393K | ﹤0.01% |
31,900
+31,798
| +31,175% | +$310K |
|
4535
CALL
Old Republic International
ORI
$10.9B
| $393K | ﹤0.01% |
+15,800
| New | +$397K |
|
4536
CALL
Takeda Pharmaceutical
TAK
$56.7B
| $393K | ﹤0.01% |
23,400
+22,712
| +3,301% | +$387K |
|
|
EVA
4537
CALL
DELISTED
Enviva Inc.
EVA
| $393K | ﹤0.01% |
7,500
+7,456
| +16,945% | +$368K |
|
|
ZY
4538
DELISTED
Zymergen Inc. Common Stock
ZY
| $393K | ﹤0.01% |
+9,834
| New | +$388K |
|
|
WBT
4539
PUT
DELISTED
Welbilt, Inc.
WBT
| $393K | ﹤0.01% |
17,000
+16,919
| +20,888% | +$359K |
|
4540
PUT
Icon
ICLR
$13.7B
| $392K | ﹤0.01% |
+1,900
| New | +$410K |
|
4541
CALL
Universal Electronics
UEIC
$59.2M
| $392K | ﹤0.01% |
+8,100
| New | +$420K |
|
4542
PUT
Vanguard ESG US Corporate Bond ETF
VCEB
$1.18B
| $392K | ﹤0.01% |
2,800
+2,660
| +1,900% | +$195K |
|
4543
PUT
argenx
ARGX
$55.2B
| $391K | ﹤0.01% |
1,300
+1,296
| +32,400% | +$369K |
|
4544
CarGurus
CARG
$3.34B
| $390K | ﹤0.01% |
14,895
+11,102
| +293% | +$288K |
|
|
4545
CALL
Delek Logistics
DKL
$3.12B
| $390K | ﹤0.01% |
9,300
+9,286
| +66,329% | +$381K |
|
|
KG
4546
CALL
Kestrel Group
KG
$66.1M
| $390K | ﹤0.01% |
5,790
+5,693
| +5,869% | +$396K |
|
4547
CALL
Metallus
MTUS
$833M
| $390K | ﹤0.01% |
+27,600
| New | +$373K |
|
4548
PUT
Arcturus Therapeutics
ARCT
$165M
| $389K | ﹤0.01% |
11,500
+11,246
| +4,428% | +$381K |
|
4549
PUT
CMS Energy
CMS
$23B
| $389K | ﹤0.01% |
6,600
+6,579
| +31,329% | +$409K |
|
4550
WEC Energy
WEC
$36.3B
| $389K | ﹤0.01% |
4,377
+2,734
| +166% | +$258K |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.