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 |
Tesla
TSLA
|
+$33.5M |
| 2 |
Netflix
NFLX
|
+$22.8M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$20.9M |
| 4 |
TWX
Time Warner Inc
TWX
|
+$18.3M |
| 5 |
Alibaba
BABA
|
+$15.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$71.1M |
| 2 |
Micron Technology
MU
|
+$43.8M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$26.3M |
| 4 |
Booking.com
BKNG
|
+$22.2M |
| 5 |
Boeing
BA
|
+$21.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 7.87% |
| 2 | Communication Services | 7.14% |
| 3 | Technology | 6.23% |
| 4 | Financials | 5.5% |
| 5 | Healthcare | 5.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3501
PUT
Fabrinet
FN
$14.9B
| $17K | ﹤0.01% |
121
+99
| +450% | +$2.92K |
|
3502
ProShares UltraShort Gold
GLL
$127M
| $17K | ﹤0.01% |
66
-3,454
| -98% | -$919K |
|
|
GOOS
3503
CALL
Canada Goose Holdings
GOOS
$903M
| $17K | ﹤0.01% |
39
-126
| -76% | -$4.23K |
|
3504
PUT
Hasbro
HAS
$13.5B
| $17K | ﹤0.01% |
79
-36
| -31% | -$3.34K |
|
|
HEES
3505
CALL
DELISTED
H&E Equipment Services
HEES
| $17K | ﹤0.01% |
65
-154
| -70% | -$6.05K |
|
3506
HEICO Corp
HEI
$49.6B
| $17K | ﹤0.01% |
+249
| New | +$16.3K |
|
3507
PUT
Hilton Worldwide
HLT
$72.4B
| $17K | ﹤0.01% |
212
+20
| +10% | +$1.64K |
|
3508
iShares S&P Small-Cap 600 Growth ETF
IJT
$8.13B
| $17K | ﹤0.01% |
+200
| New | +$17.4K |
|
3509
CALL
Koppers
KOP
$946M
| $17K | ﹤0.01% |
104
+45
| +76% | +$1.98K |
|
3510
Lantheus
LNTH
$6.51B
| $17K | ﹤0.01% |
+1,099
| New | +$21.4K |
|
3511
CALL
MacroGenics
MGNX
$233M
| $17K | ﹤0.01% |
+67
| New | +$1.63K |
|
3512
PUT
MakeMyTrip
MMYT
$5.38B
| $17K | ﹤0.01% |
267
+110
| +70% | +$3.5K |
|
3513
PUT
Murphy Oil
MUR
$5.55B
| $17K | ﹤0.01% |
176
-77
| -30% | -$2.23K |
|
3514
PUT
Oshkosh
OSK
$8.91B
| $17K | ﹤0.01% |
79
+64
| +427% | +$5.45K |
|
3515
CALL
PACCAR
PCAR
$70.5B
| $17K | ﹤0.01% |
125
-433
| -78% | -$20.5K |
|
3516
PUT
Protolabs
PRLB
$1.7B
| $17K | ﹤0.01% |
+201
| New | +$22.7K |
|
|
RDFN
3517
PUT
DELISTED
Redfin
RDFN
| $17K | ﹤0.01% |
109
-60
| -36% | -$1.38K |
|
3518
CALL
Boston Beer
SAM
$1.95B
| $17K | ﹤0.01% |
12
-6
| -33% | -$1.1K |
|
3519
CALL
TD Synnex
SNX
$19.9B
| $17K | ﹤0.01% |
50
+36
| +257% | +$2.24K |
|
|
THS
3520
PUT
DELISTED
Treehouse Foods
THS
| $17K | ﹤0.01% |
46
+25
| +119% | +$1.09K |
|
3521
Interface
TILE
$1.95B
| $17K | ﹤0.01% |
696
-4,322
| -86% | -$107K |
|
3522
CALL
Marriott Vacations Worldwide
VAC
$3.53B
| $17K | ﹤0.01% |
78
+34
| +77% | +$4.81K |
|
3523
PUT
Vishay Intertechnology
VSH
$4.6B
| $17K | ﹤0.01% |
80
+39
| +95% | +$781 |
|
3524
CALL
NCR Voyix
VYX
$1.19B
| $17K | ﹤0.01% |
210
+1
| +0.5% | +$21 |
|
3525
CALL
Wingstop
WING
$3.8B
| $17K | ﹤0.01% |
80
-42
| -34% | -$1.93K |
|
Similar funds
Simplex Trading's Q1 2018 Portfolio in Review
As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.
Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.
- Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
- Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
- Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
- Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
- Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
- Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.
Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.