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 | |
|---|---|---|---|---|---|---|
|
AXON
3301
Axon Enterprise
AXON
$42.4B
| $266K | ﹤0.01% |
+4,903
| New | +$251K |
|
3302
PUT
Tidewater
TDW
$3.91B
| $266K | ﹤0.01% |
115
+100
| +667% | +$2.25K |
|
3303
PUT
Vicor
VICR
$9.41B
| $266K | ﹤0.01% |
86
+38
| +79% | +$1.4K |
|
3304
PUT
AMC Entertainment Holdings
AMC
$2.24B
| $265K | ﹤0.01% |
18
-90
| -83% | -$12.8K |
|
3305
CALL
Benchmark Electronics
BHE
$2.86B
| $265K | ﹤0.01% |
101
+100
| +10,000% | +$2.56K |
|
3306
PUT
MACOM Technology Solutions
MTSI
$20.1B
| $265K | ﹤0.01% |
159
+2
| +1% | +$35 |
|
3307
Ryder
R
$10.3B
| $265K | ﹤0.01% |
4,276
-1,757
| -29% | -$103K |
|
3308
PUT
Coca-Cola Femsa
KOF
$22.9B
| $264K | ﹤0.01% |
+40
| New | +$2.51K |
|
3309
PUT
Nelnet
NNI
$4.81B
| $264K | ﹤0.01% |
48
+34
| +243% | +$1.83K |
|
3310
CALL
PetMed Express
PETS
$42.1M
| $264K | ﹤0.01% |
116
-39
| -25% | -$879 |
|
3311
PUT
Wolverine World Wide
WWW
$1.56B
| $264K | ﹤0.01% |
74
+17
| +30% | +$594 |
|
|
SAVE
3312
PUT
DELISTED
Spirit Airlines, Inc.
SAVE
| $264K | ﹤0.01% |
50
+11
| +28% | +$633 |
|
3313
CALL
G-III Apparel Group
GIII
$1.52B
| $263K | ﹤0.01% |
66
+56
| +560% | +$1.95K |
|
3314
PUT
Golar LNG
GLNG
$4.99B
| $263K | ﹤0.01% |
125
-79
| -39% | -$1.74K |
|
3315
CALL
Kodak
KODK
$788M
| $263K | ﹤0.01% |
891
-521
| -37% | -$1.58K |
|
3316
Safety Insurance
SAFT
$1.51B
| $263K | ﹤0.01% |
3,027
+23
| +0.8% | +$1.97K |
|
|
VER
3317
PUT
DELISTED
VEREIT, Inc.
VER
| $263K | ﹤0.01% |
63
+5
| +9% | +$200 |
|
3318
Axos Financial
AX
$5.45B
| $262K | ﹤0.01% |
+9,065
| New | +$272K |
|
|
CHU
3319
CALL
DELISTED
China Unicom (HONG KONG) Limited
CHU
| $262K | ﹤0.01% |
205
+200
| +4,000% | +$2.37K |
|
|
PR
3320
CALL
Permian Resources
PR
$17B
| $261K | ﹤0.01% |
297
+157
| +112% | +$1.78K |
|
|
ENDP
3321
DELISTED
Endo International plc
ENDP
| $261K | ﹤0.01% |
32,603
-5,286
| -14% | -$49.7K |
|
|
QIWI
3322
DELISTED
QIWI PLC
QIWI
| $261K | ﹤0.01% |
18,140
-1,777
| -9% | -$26K |
|
3323
PUT
Enphase Energy
ENPH
$5.01B
| $260K | ﹤0.01% |
282
-52
| -16% | -$395 |
|
3324
PUT
Energy Recovery
ERII
$439M
| $260K | ﹤0.01% |
298
+272
| +1,046% | +$2.17K |
|
|
CRZO
3325
DELISTED
Carrizo Oil & Gas Inc
CRZO
| $260K | ﹤0.01% |
+20,929
| New | +$249K |
|
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.