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 | |
|---|---|---|---|---|---|---|
|
WWE
2051
DELISTED
World Wrestling Entertainment
WWE
| $883K | ﹤0.01% |
12,415
-1,275
| -9% | -$91.4K |
|
2052
ANI Pharmaceuticals
ANIP
$1.77B
| $882K | ﹤0.01% |
12,115
+10,251
| +550% | +$767K |
|
2053
CALL
Ingredion
INGR
$6.38B
| $882K | ﹤0.01% |
108
-331
| -75% | -$26.3K |
|
2054
CALL
Ametek
AME
$55.5B
| $881K | ﹤0.01% |
96
+93
| +3,100% | +$8.21K |
|
2055
PUT
Ziff Davis
ZD
$1.9B
| $880K | ﹤0.01% |
112
+106
| +1,767% | +$8.03K |
|
2056
CALL
Cheesecake Factory
CAKE
$4.21B
| $879K | ﹤0.01% |
211
+69
| +49% | +$2.84K |
|
|
P
2057
CALL
Everpure Inc
P
$24.8B
| $879K | ﹤0.01% |
519
+155
| +43% | +$2.43K |
|
2058
PUT
Targa Resources
TRGP
$60.4B
| $879K | ﹤0.01% |
219
-540
| -71% | -$20.6K |
|
2059
CALL
LivePerson
LPSN
$18.9M
| $878K | ﹤0.01% |
16
-16
| -50% | -$8.5K |
|
2060
PUT
Essential Properties Realty Trust
EPRT
$6.99B
| $877K | ﹤0.01% |
383
-26
| -6% | -$560 |
|
2061
PUT
United Therapeutics
UTHR
$26.3B
| $877K | ﹤0.01% |
110
-81
| -42% | -$6.52K |
|
|
ZNGA
2062
PUT
DELISTED
ZYNGA INC. CL A COMMON
ZNGA
| $876K | ﹤0.01% |
1,506
+745
| +98% | +$4.48K |
|
2063
Agios Pharmaceuticals
AGIO
$2.16B
| $875K | ﹤0.01% |
+27,037
| New | +$1.12M |
|
|
GTT
2064
CALL
DELISTED
GTT Communications, Inc.
GTT
| $874K | ﹤0.01% |
928
+751
| +424% | +$8.45K |
|
2065
PUT
A.O. Smith
AOS
$8.38B
| $873K | ﹤0.01% |
183
-9
| -5% | -$416 |
|
2066
PUT
Korn Ferry
KFY
$3.98B
| $873K | ﹤0.01% |
226
+111
| +97% | +$4.29K |
|
2067
CALL
Puma Biotechnology
PBYI
$406M
| $873K | ﹤0.01% |
811
+154
| +23% | +$1.66K |
|
|
TRTN
2068
PUT
DELISTED
Triton International Limited
TRTN
| $873K | ﹤0.01% |
258
+102
| +65% | +$3.33K |
|
2069
PUT
BGC Group
BGC
$5.58B
| $871K | ﹤0.01% |
1,584
+89
| +6% | +$477 |
|
2070
Knowles
KN
$3.22B
| $870K | ﹤0.01% |
42,780
+21,305
| +99% | +$418K |
|
2071
PUT
Sempra
SRE
$60.8B
| $870K | ﹤0.01% |
118
-128
| -52% | -$8.96K |
|
2072
PUT
The RealReal
REAL
$1.34B
| $869K | ﹤0.01% |
+389
| New | +$7.82K |
|
2073
Magnachip Semiconductor
MX
$128M
| $868K | ﹤0.01% |
85,676
+84,242
| +5,875% | +$886K |
|
2074
CALL
Sunoco
SUN
$14.2B
| $868K | ﹤0.01% |
276
+120
| +77% | +$3.83K |
|
2075
Tesla
TSLA
$1.24T
| $867K | ﹤0.01% |
54,045
+27,555
| +104% | +$431K |
|
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.