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 | |
|---|---|---|---|---|---|---|
|
UWC
276
CALL
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $15.9M | 0.04% |
2,995
-2,830
| -49% | -$15M |
|
277
PUT
HSBC
HSBC
$354B
| $15.8M | 0.04% |
3,944
+1,792
| +83% | +$72.2K |
|
278
PUT
Marriott International
MAR
$97.5B
| $15.7M | 0.04% |
1,259
+178
| +16% | +$20.9K |
|
279
CALL
DuPont de Nemours
DD
$18.9B
| $15.7M | 0.04% |
1,166
-154
| -12% | -$21.4K |
|
|
CTXS
280
PUT
DELISTED
Citrix Systems Inc
CTXS
| $15.7M | 0.04% |
1,576
+731
| +87% | +$75.8K |
|
281
CALL
Lam Research
LRCX
$399B
| $15.6M | 0.04% |
8,720
-20,350
| -70% | -$340K |
|
282
PUT
Expedia Group
EXPE
$31.3B
| $15.6M | 0.04% |
1,307
+380
| +41% | +$46.1K |
|
283
PUT
AB InBev
BUD
$161B
| $15.6M | 0.04% |
1,852
+297
| +19% | +$22.8K |
|
284
CALL
Marathon Petroleum
MPC
$92.2B
| $15.5M | 0.04% |
2,584
+102
| +4% | +$6.42K |
|
285
CALL
Vanguard S&P 500 ETF
VOO
$979B
| $15.3M | 0.04% |
1,418
+594
| +72% | +$148K |
|
286
CALL
Petrobras
PBR
$122B
| $15.3M | 0.04% |
9,602
-7,068
| -42% | -$112K |
|
287
CALL
BP
BP
$112B
| $15.2M | 0.04% |
3,530
+1,827
| +107% | +$74.9K |
|
|
XLNX
288
CALL
DELISTED
Xilinx Inc
XLNX
| $15.1M | 0.04% |
1,191
-43
| -3% | -$4.83K |
|
289
CALL
Shopify
SHOP
$154B
| $15.1M | 0.04% |
7,290
-4,530
| -38% | -$80K |
|
290
CALL
SLB Ltd
SLB
$71.3B
| $15.1M | 0.04% |
3,456
+198
| +6% | +$8.56K |
|
291
PUT
Spotify
SPOT
$97.5B
| $15M | 0.04% |
1,084
+471
| +77% | +$64.4K |
|
292
CALL
United Airlines
UAL
$38.1B
| $15M | 0.04% |
1,880
+34
| +2% | +$2.87K |
|
293
PUT
Prudential Financial
PRU
$41.3B
| $15M | 0.04% |
1,632
+1,310
| +407% | +$121K |
|
|
WBA
294
PUT
DELISTED
Walgreens Boots Alliance
WBA
| $14.8M | 0.04% |
2,333
+271
| +13% | +$18.5K |
|
295
PUT
Carvana
CVNA
$44.9B
| $14.7M | 0.04% |
12,660
+10,200
| +415% | +$85.8K |
|
296
PUT
Tilray
TLRY
$514M
| $14.7M | 0.04% |
224
-68
| -23% | -$51.9K |
|
297
PUT
Charter Communications
CHTR
$15.9B
| $14.4M | 0.04% |
416
+41
| +11% | +$13.5K |
|
298
PUT
Mondelez International
MDLZ
$78.1B
| $14.4M | 0.04% |
2,890
+2,077
| +255% | +$95.3K |
|
299
CALL
United States Natural Gas Fund
UNG
$472M
| $14.4M | 0.04% |
1,536
+786
| +105% | +$78.6K |
|
300
PUT
RH
RH
$3.31B
| $14.4M | 0.04% |
1,399
+857
| +158% | +$117K |
|
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.