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 | |
|---|---|---|---|---|---|---|
|
PFSW
7276
DELISTED
PFSweb, Inc.
PFSW
| $67K | ﹤0.01% |
9,111
+9,078
| +27,509% | +$67.3K |
|
7277
PUT
Adeia
ADEA
$2.55B
| $66K | ﹤0.01% |
11,340
+11,253
| +12,934% | +$64K |
|
|
BPT
7278
DELISTED
BP Prudhoe Bay Royalty Trust
BPT
| $66K | ﹤0.01% |
13,009
+12,909
| +12,909% | +$51.6K |
|
7279
CALL
Brixmor Property Group
BRX
$9.72B
| $66K | ﹤0.01% |
2,900
+2,889
| +26,264% | +$64.4K |
|
7280
PUT
Clearwater Paper
CLW
$349M
| $66K | ﹤0.01% |
2,300
+2,295
| +45,900% | +$71.6K |
|
|
DHC
7281
PUT
Diversified Healthcare Trust
DHC
$2.15B
| $66K | ﹤0.01% |
15,800
+15,625
| +8,929% | +$64.5K |
|
7282
PUT
Invesco CurrencyShares British Pound Sterling Trust
FXB
$77.1M
| $66K | ﹤0.01% |
500
+468
| +1,463% | +$63.1K |
|
7283
CALL
IDEX
IEX
$17B
| $66K | ﹤0.01% |
300
+285
| +1,900% | +$63K |
|
7284
CALL
Lineage Cell Therapeutics
LCTX
$264M
| $66K | ﹤0.01% |
23,300
+23,177
| +18,843% | +$60K |
|
7285
PUT
Marker Therapeutics
MRKR
$18.5M
| $66K | ﹤0.01% |
2,390
+2,355
| +6,729% | +$62K |
|
7286
Prestige Consumer Healthcare
PBH
$2.47B
| $66K | ﹤0.01% |
1,278
+935
| +273% | +$44.9K |
|
7287
Petrobras Class A
PBR.A
$106B
| $66K | ﹤0.01% |
5,611
+3,477
| +163% | +$34.2K |
|
7288
CALL
RPC Inc
RES
$1.13B
| $66K | ﹤0.01% |
13,400
+13,308
| +14,465% | +$71.7K |
|
7289
PUT
Talkspace
TALK
$874M
| $66K | ﹤0.01% |
+8,000
| New | +$77.7K |
|
|
WSR
7290
CALL
DELISTED
Whitestone REIT
WSR
| $66K | ﹤0.01% |
8,000
+7,876
| +6,352% | +$70.8K |
|
|
CASA
7291
DELISTED
Casa Systems, Inc. Common Stock
CASA
| $66K | ﹤0.01% |
7,455
-14,085
| -65% | -$125K |
|
|
APTO
7292
DELISTED
Aptose Biosciences, Inc.
APTO
| $66K | ﹤0.01% |
44
-113
| -72% | -$246K |
|
|
Y
7293
CALL
DELISTED
Alleghany Corp
Y
| $66K | ﹤0.01% |
100
+85
| +567% | +$58.5K |
|
|
LMNX
7294
PUT
DELISTED
Luminex Corp
LMNX
| $66K | ﹤0.01% |
1,800
+1,672
| +1,306% | +$60.8K |
|
|
AMWD
7295
CALL
DELISTED
American Woodmark
AMWD
| $65K | ﹤0.01% |
800
+638
| +394% | +$59.7K |
|
7296
CALL
Ascendis Pharma A/S
ASND
$16.5B
| $65K | ﹤0.01% |
500
+496
| +12,400% | +$66.1K |
|
7297
Axos Financial
AX
$5.58B
| $65K | ﹤0.01% |
+1,420
| New | +$66.3K |
|
7298
PUT
Barrett Business Services
BBSI
$1.01B
| $65K | ﹤0.01% |
+3,600
| New | +$65.9K |
|
|
ETNB
7299
DELISTED
89bio
ETNB
| $65K | ﹤0.01% |
3,481
-8,138
| -70% | -$182K |
|
7300
PUT
Evogene
EVGN
$5.83M
| $65K | ﹤0.01% |
1,920
+1,902
| +10,567% | +$74.5K |
|
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.