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 | |
|---|---|---|---|---|---|---|
3976
PUT
Paysign
PAYS
$517M
| $135K | ﹤0.01% |
134
-73
| -35% | -$972 |
|
3977
Prothena Corp
PRTA
$448M
| $135K | ﹤0.01% |
17,322
-1,147
| -6% | -$10.2K |
|
3978
PUT
ResMed
RMD
$31.1B
| $135K | ﹤0.01% |
10
-13
| -57% | -$1.7K |
|
3979
CALL
Workiva
WK
$3.45B
| $135K | ﹤0.01% |
31
+24
| +343% | +$1.26K |
|
|
ALTR
3980
CALL
DELISTED
Altair Engineering Inc
ALTR
| $135K | ﹤0.01% |
+39
| New | +$1.45K |
|
|
RVNC
3981
PUT
DELISTED
Revance Therapeutics, Inc.
RVNC
| $135K | ﹤0.01% |
104
| – | – |
|
|
APTS
3982
CALL
DELISTED
Preferred Apartment Communities, Inc.
APTS
| $135K | ﹤0.01% |
94
+16
| +21% | +$231 |
|
3983
PUT
Amneal Pharmaceuticals
AMRX
$6.1B
| $134K | ﹤0.01% |
464
+419
| +931% | +$1.46K |
|
3984
PUT
Ameresco
AMRC
$980M
| $134K | ﹤0.01% |
84
+58
| +223% | +$846 |
|
3985
CALL
Delek Logistics
DKL
$3.12B
| $134K | ﹤0.01% |
+43
| New | +$1.35K |
|
3986
PUT
Labcorp
LH
$25.2B
| $134K | ﹤0.01% |
9
-225
| -96% | -$32.8K |
|
3987
PUT
Plug Power
PLUG
$2.65B
| $134K | ﹤0.01% |
511
+274
| +116% | +$635 |
|
3988
CALL
Teekay
TK
$996M
| $134K | ﹤0.01% |
335
+31
| +10% | +$124 |
|
3989
Tenaris
TS
$28.2B
| $134K | ﹤0.01% |
6,361
+4,279
| +206% | +$100K |
|
3990
CALL
Virtu Financial
VIRT
$5.04B
| $134K | ﹤0.01% |
82
-100
| -55% | -$2K |
|
3991
PUT
Essential Utilities
WTRG
$11.5B
| $134K | ﹤0.01% |
30
+27
| +900% | +$1.16K |
|
|
GRA
3992
DELISTED
W.R. Grace & Co.
GRA
| $134K | ﹤0.01% |
2,014
+740
| +58% | +$51.8K |
|
3993
CALL
Brown & Brown
BRO
$25.1B
| $133K | ﹤0.01% |
+37
| New | +$1.32K |
|
|
SAND
3994
PUT
DELISTED
Sandstorm Gold
SAND
| $133K | ﹤0.01% |
236
+165
| +232% | +$1K |
|
3995
PUT
Star Bulk Carriers
SBLK
$3.05B
| $133K | ﹤0.01% |
133
+56
| +73% | +$571 |
|
3996
Sonoco
SON
$5.83B
| $133K | ﹤0.01% |
+2,297
| New | +$137K |
|
|
TPIC
3997
CALL
DELISTED
TPI Composites
TPIC
| $133K | ﹤0.01% |
71
+64
| +914% | +$1.37K |
|
3998
VirnetX Holding Corp
VHC
$53.8M
| $133K | ﹤0.01% |
1,236
-958
| -44% | -$114K |
|
3999
PUT
Vera Bradley
VRA
$98.7M
| $133K | ﹤0.01% |
132
+125
| +1,786% | +$1.32K |
|
|
TOO
4000
PUT
DELISTED
Teekay Offshore Partners L.P.
TOO
| $133K | ﹤0.01% |
1,153
+249
| +28% | +$296 |
|
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.