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 | |
|---|---|---|---|---|---|---|
|
OTLY
1526
PUT
Oatly Group
OTLY
$417M
| $3.45M | ﹤0.01% |
+7,060
| New | +$3.51M |
|
1527
DoorDash
DASH
$75.3B
| $3.45M | ﹤0.01% |
19,362
+19,293
| +27,961% | +$2.83M |
|
1528
iShares Global Clean Energy ETF
ICLN
$2.38B
| $3.45M | ﹤0.01% |
147,127
-148,302
| -50% | -$3.38M |
|
1529
PUT
Evercore
EVR
$13.1B
| $3.45M | ﹤0.01% |
24,500
+24,286
| +11,349% | +$3.39M |
|
|
TIGR
1530
UP Fintech Holding
TIGR
$845M
| $3.45M | ﹤0.01% |
118,985
-46,780
| -28% | -$995K |
|
1531
PUT
Five Below
FIVE
$11.2B
| $3.44M | ﹤0.01% |
17,800
+17,463
| +5,182% | +$3.34M |
|
1532
CALL
Titan Machinery
TITN
$466M
| $3.44M | ﹤0.01% |
111,100
+111,060
| +277,650% | +$3.11M |
|
|
ALXN
1533
DELISTED
Alexion Pharmaceuticals
ALXN
| $3.44M | ﹤0.01% |
18,712
-16,844
| -47% | -$2.89M |
|
|
CCXI
1534
PUT
DELISTED
ChemoCentryx, Inc.
CCXI
| $3.44M | ﹤0.01% |
256,600
+256,569
| +827,642% | +$6.32M |
|
1535
PUT
Ubiquiti
UI
$31.8B
| $3.43M | ﹤0.01% |
11,000
+10,778
| +4,855% | +$3.16M |
|
|
USCR
1536
PUT
DELISTED
U S Concrete, Inc.
USCR
| $3.43M | ﹤0.01% |
46,500
+46,403
| +47,838% | +$3M |
|
|
AVLR
1537
CALL
DELISTED
Avalara, Inc.
AVLR
| $3.43M | ﹤0.01% |
21,200
+20,889
| +6,717% | +$2.91M |
|
|
JKS
1538
PUT
JinkoSolar
JKS
$775M
| $3.43M | ﹤0.01% |
+61,200
| New | +$2.34M |
|
1539
PUT
Revvity
RVTY
$12.3B
| $3.43M | ﹤0.01% |
22,200
+21,843
| +6,118% | +$3.07M |
|
|
BIG
1540
CALL
DELISTED
Big Lots, Inc.
BIG
| $3.42M | ﹤0.01% |
51,900
+51,513
| +13,311% | +$3.43M |
|
1541
PUT
AngloGold Ashanti
AU
$40.3B
| $3.42M | ﹤0.01% |
+184,200
| New | +$4.05M |
|
|
JNPR
1542
CALL
DELISTED
Juniper Networks
JNPR
| $3.42M | ﹤0.01% |
124,900
+123,581
| +9,369% | +$3.29M |
|
1543
CALL
Alcon
ALC
$33.1B
| $3.41M | ﹤0.01% |
48,500
+48,002
| +9,639% | +$3.42M |
|
1544
PUT
ResMed
RMD
$28.3B
| $3.4M | ﹤0.01% |
13,800
+13,795
| +275,900% | +$2.9M |
|
1545
KB Home
KBH
$3.48B
| $3.4M | ﹤0.01% |
83,440
+50,308
| +152% | +$2.32M |
|
|
BTWN
1546
PUT
DELISTED
Bridgetown Holdings Limited Class A Ordinary Shares
BTWN
| $3.4M | ﹤0.01% |
335,700
+334,510
| +28,110% | +$3.47M |
|
|
VTLE
1547
CALL
DELISTED
Vital Energy
VTLE
| $3.4M | ﹤0.01% |
36,600
+36,274
| +11,127% | +$1.87M |
|
1548
PUT
United Parks & Resorts
PRKS
$2.11B
| $3.4M | ﹤0.01% |
+68,000
| New | +$3.61M |
|
1549
PUT
Fulgent Genetics
FLGT
$559M
| $3.39M | ﹤0.01% |
36,800
+36,352
| +8,114% | +$2.9M |
|
|
ZH
1550
PUT
Zhihu
ZH
$270M
| $3.39M | ﹤0.01% |
+41,717
| New | +$2.39M |
|
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.