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 | |
|---|---|---|---|---|---|---|
|
BZUN
1026
CALL
Baozun
BZUN
$145M
| $3M | 0.01% |
723
+668
| +1,215% | +$23.4K |
|
1027
CME Group
CME
$91B
| $3M | 0.01% |
+18,246
| New | +$3.23M |
|
1028
CALL
Allison Transmission
ALSN
$10.2B
| $3M | 0.01% |
668
-9
| -1% | -$427 |
|
1029
PUT
Arrow Electronics
ARW
$11B
| $3M | 0.01% |
389
+384
| +7,680% | +$29.5K |
|
1030
CALL
Ubiquiti
UI
$32.2B
| $2.99M | 0.01% |
200
-48
| -19% | -$6.06K |
|
|
BFYT
1031
PUT
DELISTED
Benefytt Technologies, Inc. Class A Common Stock
BFYT
| $2.98M | 0.01% |
1,113
+695
| +166% | +$24.6K |
|
1032
PUT
Textron
TXT
$16.6B
| $2.98M | 0.01% |
589
+136
| +30% | +$7.02K |
|
|
THS
1033
PUT
DELISTED
Treehouse Foods
THS
| $2.98M | 0.01% |
462
+362
| +362% | +$21.3K |
|
1034
PUT
Idexx Laboratories
IDXX
$42.9B
| $2.97M | 0.01% |
133
-102
| -43% | -$21.1K |
|
|
APHA
1035
PUT
DELISTED
Aphria Inc. Common Shares
APHA
| $2.97M | 0.01% |
3,190
-1,983
| -38% | -$17.4K |
|
1036
PUT
Macy's
M
$6.14B
| $2.97M | 0.01% |
1,235
-2,478
| -67% | -$62.6K |
|
|
B
1037
PUT
Barrick Mining
B
$62.9B
| $2.96M | 0.01% |
2,163
+1,820
| +531% | +$23.5K |
|
1038
CALL
Akamai
AKAM
$17B
| $2.96M | 0.01% |
413
-395
| -49% | -$26.8K |
|
1039
CALL
Corpay
CPAY
$24.3B
| $2.96M | 0.01% |
120
-3
| -2% | -$649 |
|
1040
PNC Financial Services
PNC
$100B
| $2.96M | 0.01% |
+24,091
| New | +$2.98M |
|
1041
PUT
Restaurant Brands International
QSR
$25.3B
| $2.95M | 0.01% |
453
-531
| -54% | -$32.6K |
|
1042
PUT
United States Oil Fund
USO
$2.42B
| $2.94M | 0.01% |
294
-788
| -73% | -$72.6K |
|
1043
PUT
Snap
SNAP
$7.37B
| $2.94M | 0.01% |
2,669
+863
| +48% | +$7.34K |
|
1044
PUT
Fastenal
FAST
$53.7B
| $2.94M | 0.01% |
1,828
+1,240
| +211% | +$18.7K |
|
1045
PUT
Travelers Companies
TRV
$80.6B
| $2.94M | 0.01% |
214
-264
| -55% | -$33.8K |
|
1046
PUT
AptarGroup
ATR
$8.37B
| $2.92M | 0.01% |
+275
| New | +$27.5K |
|
1047
PUT
Ascendis Pharma A/S
ASND
$16.9B
| $2.92M | 0.01% |
248
+130
| +110% | +$11.4K |
|
1048
Microchip Technology
MCHP
$43.1B
| $2.92M | 0.01% |
70,344
+49,066
| +231% | +$2.03M |
|
|
BZUN
1049
PUT
Baozun
BZUN
$145M
| $2.92M | 0.01% |
702
+46
| +7% | +$1.61K |
|
1050
CALL
Marvell Technology
MRVL
$178B
| $2.92M | 0.01% |
1,466
-699
| -32% | -$13.1K |
|
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.