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 | |
|---|---|---|---|---|---|---|
|
PTR
1801
PUT
DELISTED
PETROCHINA COMPANY LIMITED ADS (REP 100 H SHARES)
PTR
| $1.15M | ﹤0.01% |
226
-77
| -25% | -$4K |
|
1802
PUT
US Foods
USFD
$21.4B
| $1.15M | ﹤0.01% |
279
+278
| +27,800% | +$10.7K |
|
1803
BorgWarner
BWA
$13.2B
| $1.15M | ﹤0.01% |
35,461
+22,317
| +170% | +$719K |
|
|
DAY
1804
PUT
DELISTED
Dayforce
DAY
| $1.15M | ﹤0.01% |
232
+53
| +30% | +$2.77K |
|
1805
PUT
Macerich
MAC
$7.32B
| $1.14M | ﹤0.01% |
362
-92
| -20% | -$2.9K |
|
1806
PUT
Alcon
ALC
$33.1B
| $1.14M | ﹤0.01% |
196
+33
| +20% | +$1.98K |
|
|
DCP
1807
CALL
DELISTED
DCP Midstream, LP
DCP
| $1.14M | ﹤0.01% |
436
+397
| +1,018% | +$10.8K |
|
1808
CALL
DaVita
DVA
$15.1B
| $1.14M | ﹤0.01% |
200
-608
| -75% | -$35.3K |
|
1809
CALL
British American Tobacco
BTI
$132B
| $1.14M | ﹤0.01% |
309
-4
| -1% | -$146 |
|
1810
PUT
Fortive
FTV
$19B
| $1.14M | ﹤0.01% |
263
+239
| +996% | +$11K |
|
1811
CALL
F5
FFIV
$22.1B
| $1.14M | ﹤0.01% |
81
-5
| -6% | -$691 |
|
|
BZUN
1812
PUT
Baozun
BZUN
$144M
| $1.14M | ﹤0.01% |
266
-67
| -20% | -$3.19K |
|
1813
CALL
Steel Dynamics
STLD
$35.6B
| $1.14M | ﹤0.01% |
381
+64
| +20% | +$1.89K |
|
1814
Ambarella
AMBA
$2.99B
| $1.13M | ﹤0.01% |
18,061
+2,573
| +17% | +$133K |
|
|
BBBY
1815
PUT
Bed Bath & Beyond
BBBY
$473M
| $1.13M | ﹤0.01% |
1,424
+337
| +31% | +$4.61K |
|
1816
CALL
ICU Medical
ICUI
$3.93B
| $1.13M | ﹤0.01% |
71
+69
| +3,450% | +$13.7K |
|
1817
PUT
Nutrien
NTR
$32.7B
| $1.13M | ﹤0.01% |
227
+66
| +41% | +$3.37K |
|
1818
WisdomTree India Earnings Fund ETF
EPI
$2.02B
| $1.13M | ﹤0.01% |
47,302
-16,827
| -26% | -$404K |
|
|
AABA
1819
DELISTED
Altaba Inc
AABA
| $1.13M | ﹤0.01% |
57,919
+929
| +2% | +$61.4K |
|
1820
PUT
Synaptics
SYNA
$4.41B
| $1.13M | ﹤0.01% |
282
| – | – |
|
|
PINC
1821
PUT
DELISTED
Premier
PINC
| $1.12M | ﹤0.01% |
+389
| New | +$14.5K |
|
1822
Sea Limited
SE
$61.2B
| $1.12M | ﹤0.01% |
36,325
+22,491
| +163% | +$755K |
|
|
NEWR
1823
PUT
DELISTED
New Relic, Inc.
NEWR
| $1.12M | ﹤0.01% |
183
+38
| +26% | +$2.75K |
|
1824
CALL
Booz Allen Hamilton
BAH
$8.7B
| $1.12M | ﹤0.01% |
158
+120
| +316% | +$8.5K |
|
1825
PUT
Viasat
VSAT
$9.79B
| $1.12M | ﹤0.01% |
149
-239
| -62% | -$19K |
|
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.