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 | |
|---|---|---|---|---|---|---|
3326
PUT
Newmark Group
NMRK
$2.89B
| $253K | ﹤0.01% |
280
+253
| +937% | +$2.35K |
|
3327
CALL
Ternium
TX
$9.69B
| $253K | ﹤0.01% |
+132
| New | +$2.63K |
|
3328
Virtu Financial
VIRT
$5.1B
| $253K | ﹤0.01% |
+15,502
| New | +$310K |
|
|
ENBL
3329
PUT
DELISTED
ENABLE MIDSTREAM PARTNERS, LP
ENBL
| $253K | ﹤0.01% |
211
+203
| +2,538% | +$2.65K |
|
3330
CALL
Frontdoor
FTDR
$5.19B
| $252K | ﹤0.01% |
52
-10
| -16% | -$483 |
|
3331
PUT
PACCAR
PCAR
$72.1B
| $252K | ﹤0.01% |
54
-141
| -72% | -$6.43K |
|
3332
Champion Homes
SKY
$4.59B
| $252K | ﹤0.01% |
+8,401
| New | +$243K |
|
3333
CALL
Digi International
DGII
$2.53B
| $251K | ﹤0.01% |
185
+135
| +270% | +$1.78K |
|
3334
PUT
Brunswick
BC
$5.39B
| $250K | ﹤0.01% |
48
+15
| +45% | +$716 |
|
3335
iShares Gold Trust
IAU
$62.7B
| $250K | ﹤0.01% |
8,868
-2,400
| -21% | -$67.7K |
|
3336
Iovance Biotherapeutics
IOVA
$2.12B
| $250K | ﹤0.01% |
13,743
-5,492
| -29% | -$121K |
|
3337
CALL
McCormick & Company Non-Voting
MKC
$13.8B
| $250K | ﹤0.01% |
32
-224
| -88% | -$18K |
|
|
INVX
3338
CALL
Innovex International
INVX
$1.81B
| $250K | ﹤0.01% |
+50
| New | +$2.44K |
|
|
VAR
3339
CALL
DELISTED
Varian Medical Systems, Inc.
VAR
| $250K | ﹤0.01% |
21
-211
| -91% | -$25.1K |
|
3340
PUT
Denali Therapeutics
DNLI
$3.74B
| $249K | ﹤0.01% |
+163
| New | +$3.11K |
|
3341
CALL
Inogen
INGN
$174M
| $249K | ﹤0.01% |
52
+29
| +126% | +$1.51K |
|
3342
CALL
LGI Homes
LGIH
$1.44B
| $249K | ﹤0.01% |
30
-202
| -87% | -$15.4K |
|
3343
PUT
Marker Therapeutics
MRKR
$20M
| $249K | ﹤0.01% |
49
+41
| +513% | +$2.42K |
|
3344
CALL
Myriad Genetics
MYGN
$502M
| $249K | ﹤0.01% |
87
-343
| -80% | -$9.99K |
|
3345
Royal Caribbean
RCL
$86.2B
| $249K | ﹤0.01% |
2,302
-40,010
| -95% | -$4.41M |
|
3346
PUT
W.R. Berkley
WRB
$28.4B
| $249K | ﹤0.01% |
65
-5
| -7% | -$156 |
|
3347
PUT
WisdomTree
WT
$2.99B
| $248K | ﹤0.01% |
476
-302
| -39% | -$1.71K |
|
|
VGR
3348
PUT
DELISTED
Vector Group Ltd.
VGR
| $248K | ﹤0.01% |
281
+133
| +90% | +$1.02K |
|
|
ENDP
3349
DELISTED
Endo International plc
ENDP
| $248K | ﹤0.01% |
77,491
+76,561
| +8,232% | +$247K |
|
|
TUFN
3350
CALL
DELISTED
Tufin Software Technologies Ltd.
TUFN
| $248K | ﹤0.01% |
+151
| New | +$3.1K |
|
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.