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 |
Alibaba
BABA
|
+$50.3M |
| 2 |
Boeing
BA
|
+$24.3M |
| 3 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 4 |
Biogen
BIIB
|
+$15.9M |
| 5 |
FedEx
FDX
|
+$15.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$60.3M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$36.4M |
| 3 |
Netflix
NFLX
|
+$19M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$17.3M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$14.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.49% |
| 2 | Technology | 0.48% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.35% |
| 5 | Communication Services | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3501
PUT
Cheesecake Factory
CAKE
$4.42B
| $212K | ﹤0.01% |
51
-272
| -84% | -$11.2K |
|
3502
CALL
Everest Group
EG
$15.8B
| $212K | ﹤0.01% |
8
-35
| -81% | -$8.84K |
|
3503
CALL
Green Dot
GDOT
$758M
| $212K | ﹤0.01% |
84
-601
| -88% | -$22.2K |
|
|
LX
3504
LexinFintech Holdings
LX
$239M
| $212K | ﹤0.01% |
21,167
+6,093
| +40% | +$66.3K |
|
3505
RLI Corp
RLI
$5.97B
| $212K | ﹤0.01% |
+4,568
| New | +$207K |
|
3506
CALL
Ascendis Pharma A/S
ASND
$16.7B
| $211K | ﹤0.01% |
22
+4
| +22% | +$446 |
|
|
ARQL
3507
PUT
DELISTED
Arqule Inc
ARQL
| $211K | ﹤0.01% |
295
-820
| -74% | -$7.7K |
|
3508
CALL
Compass Diversified
CODI
$777M
| $210K | ﹤0.01% |
107
+82
| +328% | +$1.57K |
|
3509
CALL
Darling Ingredients
DAR
$9.28B
| $210K | ﹤0.01% |
110
+38
| +53% | +$743 |
|
3510
PUT
IMAX
IMAX
$2.59B
| $210K | ﹤0.01% |
96
+81
| +540% | +$1.72K |
|
|
CLCT
3511
PUT
DELISTED
Collectors Universe
CLCT
| $210K | ﹤0.01% |
74
+62
| +517% | +$1.51K |
|
3512
EnerSys
ENS
$6.69B
| $209K | ﹤0.01% |
3,173
+752
| +31% | +$47.2K |
|
|
LOMA
3513
CALL
Loma Negra
LOMA
$1.34B
| $209K | ﹤0.01% |
364
+274
| +304% | +$2.3K |
|
3514
CALL
Rogers Communications
RCI
$18.8B
| $209K | ﹤0.01% |
43
-1
| -2% | -$52 |
|
|
SAND
3515
CALL
DELISTED
Sandstorm Gold
SAND
| $209K | ﹤0.01% |
371
+278
| +299% | +$1.69K |
|
3516
Amplify Junior Silver Miners ETF
SILJ
$3.19B
| $209K | ﹤0.01% |
22,198
+19,972
| +897% | +$200K |
|
3517
CALL
Valvoline
VVV
$5.13B
| $209K | ﹤0.01% |
95
-20
| -17% | -$429 |
|
3518
ZTO Express
ZTO
$18.2B
| $209K | ﹤0.01% |
+9,831
| New | +$198K |
|
|
PBCT
3519
PUT
DELISTED
People's United Financial Inc
PBCT
| $209K | ﹤0.01% |
134
+93
| +227% | +$1.45K |
|
3520
PUT
GoPro
GPRO
$125M
| $208K | ﹤0.01% |
402
-118
| -23% | -$554 |
|
3521
PUT
Iridium Communications
IRDM
$4.81B
| $208K | ﹤0.01% |
98
-90
| -48% | -$2.15K |
|
|
LX
3522
PUT
LexinFintech Holdings
LX
$239M
| $208K | ﹤0.01% |
208
+174
| +512% | +$1.89K |
|
3523
CALL
NovaGold Resources
NG
$2.55B
| $208K | ﹤0.01% |
343
+51
| +17% | +$334 |
|
3524
Under Armour Class C
UA
$2.97B
| $208K | ﹤0.01% |
11,488
+6,861
| +148% | +$135K |
|
|
MIK
3525
PUT
DELISTED
Michaels Stores, Inc
MIK
| $208K | ﹤0.01% |
213
-363
| -63% | -$2.71K |
|
Similar funds
Simplex Trading's Q3 2019 Portfolio in Review
As of Q3 2019, Simplex Trading held 8,410 positions worth $35.2B, down 4.1% from $36.6B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading's Q3 2019 filing shows 1,312 new, 3,129 increased, 2,596 reduced and 1,163 closed positions. Its largest new stake was SPDR Gold Trust: 131,281 shares worth $18.2M. The largest sale was Alphabet (Google) Class C, an estimated $60.3M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.49% of assets, up from 0.26% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q3 2019 buy was SPDR Gold Trust: 131,281 shares worth $18.2M.
- Simplex Trading added most to Alibaba in Q3 2019, an estimated $50.3M increase.
- Simplex Trading's biggest Q3 2019 reduction was Alphabet (Google) Class C, cutting an estimated $60.3M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q3 2019, selling an estimated $36.4M.
- Simplex Trading's ten largest holdings make up 33% of its $35.2B portfolio in Q3 2019.
- Simplex Trading opened 1,312 new positions and closed 1,163 in Q3 2019.
- Simplex Trading's portfolio value fell 4.1% quarter-over-quarter to $35.2B.
Based on Simplex Trading's 13F filing for Q3 2019, filed 15 Oct 2019.