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 | |
|---|---|---|---|---|---|---|
3026
CALL
Iridium Communications
IRDM
$4.87B
| $344K | ﹤0.01% |
162
+30
| +23% | +$715 |
|
|
EMBJ
3027
Embraer S.A. ADS
EMBJ
$12.1B
| $343K | ﹤0.01% |
19,938
-875
| -4% | -$16.7K |
|
3028
Jack Henry & Associates
JKHY
$10.9B
| $343K | ﹤0.01% |
+2,351
| New | +$333K |
|
|
CALY
3029
Callaway Golf Company
CALY
$3.28B
| $343K | ﹤0.01% |
17,690
+14,954
| +547% | +$272K |
|
3030
PUT
Red Rock Resorts
RRR
$3.8B
| $343K | ﹤0.01% |
169
-111
| -40% | -$2.32K |
|
3031
PUT
Revolve Group
RVLV
$1.84B
| $343K | ﹤0.01% |
147
+96
| +188% | +$2.74K |
|
3032
PUT
Cameco
CCJ
$38.9B
| $342K | ﹤0.01% |
360
-407
| -53% | -$3.82K |
|
3033
Coherus Oncology
CHRS
$225M
| $342K | ﹤0.01% |
16,886
-29,670
| -64% | -$593K |
|
|
MSB
3034
CALL
Mesabi Trust
MSB
$297M
| $342K | ﹤0.01% |
143
+127
| +794% | +$3.25K |
|
3035
PUT
Invesco Aerospace & Defense ETF
PPA
$8.37B
| $342K | ﹤0.01% |
67
+43
| +179% | +$2.87K |
|
3036
CALL
Quad
QUAD
$438M
| $342K | ﹤0.01% |
326
+310
| +1,938% | +$2.9K |
|
3037
PUT
Teck Resources
TECK
$29.3B
| $342K | ﹤0.01% |
211
-109
| -34% | -$2.06K |
|
3038
Veracyte
VCYT
$4.44B
| $342K | ﹤0.01% |
14,264
+4,544
| +47% | +$121K |
|
3039
CALL
Webster Financial
WBS
$12.5B
| $342K | ﹤0.01% |
+73
| New | +$3.45K |
|
|
PLAN
3040
DELISTED
Anaplan, Inc.
PLAN
| $342K | ﹤0.01% |
7,296
+3,875
| +113% | +$210K |
|
3041
Chord Energy
CHRD
$7.42B
| $341K | ﹤0.01% |
98,649
+23,111
| +31% | +$91.1K |
|
3042
CALL
LeMaitre Vascular
LMAT
$2.26B
| $341K | ﹤0.01% |
+100
| New | +$3.19K |
|
3043
CALL
Strategy Inc
MSTR
$36B
| $341K | ﹤0.01% |
230
-60
| -21% | -$822 |
|
3044
PUT
Public Service Enterprise Group
PEG
$39.5B
| $341K | ﹤0.01% |
55
+50
| +1,000% | +$2.99K |
|
|
CVM.WS
3045
PUT
DELISTED
Cel-Sci Corp Series S
CVM.WS
| $340K | ﹤0.01% |
381
+335
| +728% | +$299K |
|
3046
CALL
Avis
CAR
$5.78B
| $339K | ﹤0.01% |
120
-87
| -42% | -$2.67K |
|
|
MAG
3047
DELISTED
MAG Silver
MAG
| $339K | ﹤0.01% |
31,982
+29,800
| +1,366% | +$345K |
|
3048
CALL
Axsome Therapeutics
AXSM
$12.3B
| $338K | ﹤0.01% |
167
-205
| -55% | -$5.27K |
|
3049
CALL
Dover
DOV
$27.7B
| $338K | ﹤0.01% |
34
-10
| -23% | -$959 |
|
|
JKS
3050
JinkoSolar
JKS
$799M
| $338K | ﹤0.01% |
21,205
+13,478
| +174% | +$271K |
|
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.