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 |
Invesco QQQ Trust
QQQ
|
+$86.9M |
| 2 |
Walt Disney
DIS
|
+$25.5M |
| 3 |
Baidu
BIDU
|
+$12.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$12.3M |
| 5 |
RHT
Red Hat Inc
RHT
|
+$11.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$60.3M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$33.9M |
| 4 |
Apple
AAPL
|
+$21.1M |
| 5 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$18.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.58% |
| 2 | Technology | 0.42% |
| 3 | Healthcare | 0.34% |
| 4 | Consumer Discretionary | 0.29% |
| 5 | Industrials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3376
CALL
MillerKnoll
MLKN
$1.54B
| $249K | ﹤0.01% |
71
+69
| +3,450% | +$2.41K |
|
3377
Ultragenyx Pharmaceutical
RARE
$2.65B
| $249K | ﹤0.01% |
+3,593
| New | +$205K |
|
3378
Calix
CALX
$2.32B
| $248K | ﹤0.01% |
32,318
-365
| -1% | -$3.22K |
|
3379
CALL
Magna International
MGA
$18.3B
| $248K | ﹤0.01% |
51
+18
| +55% | +$908 |
|
3380
PUT
Sun Communities
SUI
$15B
| $248K | ﹤0.01% |
21
-7
| -25% | -$778 |
|
3381
CALL
Vanguard High Dividend Yield ETF
VYM
$81.3B
| $248K | ﹤0.01% |
29
+15
| +107% | +$1.25K |
|
|
RP
3382
PUT
DELISTED
RealPage, Inc.
RP
| $248K | ﹤0.01% |
41
+31
| +310% | +$1.78K |
|
|
VISN
3383
PUT
Vistance Networks Inc
VISN
$2.67B
| $247K | ﹤0.01% |
114
+32
| +39% | +$673 |
|
|
SWIR
3384
PUT
DELISTED
Sierra Wireless
SWIR
| $247K | ﹤0.01% |
200
+89
| +80% | +$1.22K |
|
|
EPAY
3385
DELISTED
Bottomline Technologies Inc
EPAY
| $247K | ﹤0.01% |
4,949
-3,875
| -44% | -$187K |
|
|
PER
3386
DELISTED
SANDRIDGE PERMIAN TRUST
PER
| $247K | ﹤0.01% |
105,520
+23,843
| +29% | +$54.4K |
|
3387
Direxion Daily Financial Bull 3x ETF
FAS
$2.43B
| $246K | ﹤0.01% |
3,978
-61,677
| -94% | -$3.59M |
|
3388
PUT
TechnipFMC
FTI
$29.9B
| $246K | ﹤0.01% |
141
+47
| +50% | +$795 |
|
3389
Wintrust Financial
WTFC
$10.7B
| $246K | ﹤0.01% |
+3,655
| New | +$261K |
|
3390
CALL
Canadian Solar
CSIQ
$936M
| $245K | ﹤0.01% |
132
-470
| -78% | -$9.66K |
|
3391
PUT
Icon
ICLR
$13B
| $245K | ﹤0.01% |
+18
| New | +$2.45K |
|
3392
CALL
Navient
NAVI
$809M
| $245K | ﹤0.01% |
212
+197
| +1,313% | +$2.25K |
|
3393
CALL
Vicor
VICR
$9.41B
| $245K | ﹤0.01% |
79
+20
| +34% | +$738 |
|
3394
PUT
Aegon
AEG
$13.5B
| $244K | ﹤0.01% |
595
+558
| +1,508% | +$2.44K |
|
3395
National Fuel Gas
NFG
$7.67B
| $244K | ﹤0.01% |
4,004
-16
| -0.4% | -$929 |
|
3396
PUT
Progress Software
PRGS
$1.59B
| $244K | ﹤0.01% |
55
+41
| +293% | +$1.5K |
|
|
3397
CALL
Calix
CALX
$2.32B
| $243K | ﹤0.01% |
316
+5
| +2% | +$44 |
|
3398
PUT
Zurn Elkay Water Solutions
ZWS
$8.14B
| $243K | ﹤0.01% |
+201
| New | +$2.5K |
|
3399
PUT
Pilgrim's Pride
PPC
$6.94B
| $242K | ﹤0.01% |
109
-152
| -58% | -$2.98K |
|
|
SOHU
3400
PUT
Sohu.com
SOHU
$345M
| $242K | ﹤0.01% |
146
+82
| +128% | +$1.58K |
|
Similar funds
Simplex Trading's Q1 2019 Portfolio in Review
As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
- Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
- Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
- Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
- Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
- Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.
Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.