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 | |
|---|---|---|---|---|---|---|
|
JNPR
826
CALL
DELISTED
Juniper Networks
JNPR
| $4.15M | 0.01% |
1,677
+53
| +3% | +$1.33K |
|
827
Chipotle Mexican Grill
CMG
$40.8B
| $4.15M | 0.01% |
246,850
-206,000
| -45% | -$3.29M |
|
|
WCG
828
CALL
DELISTED
Wellcare Health Plans, Inc.
WCG
| $4.15M | 0.01% |
160
-243
| -60% | -$67.1K |
|
829
CALL
Alnylam Pharmaceuticals
ALNY
$36.3B
| $4.14M | 0.01% |
515
+238
| +86% | +$18.8K |
|
830
PUT
Dominion Energy
D
$62.5B
| $4.13M | 0.01% |
510
-140
| -22% | -$10.8K |
|
831
PUT
Acadia Pharmaceuticals
ACAD
$4.25B
| $4.13M | 0.01% |
1,148
-275
| -19% | -$8.34K |
|
832
CALL
Equity Residential
EQR
$25.4B
| $4.11M | 0.01% |
477
+469
| +5,863% | +$38.4K |
|
833
CALL
JB Hunt Transport Services
JBHT
$27.1B
| $4.11M | 0.01% |
371
-90
| -20% | -$9.27K |
|
834
PUT
Galicia Financial Group
GGAL
$7.92B
| $4.1M | 0.01% |
3,153
+1,514
| +92% | +$35.6K |
|
|
STMP
835
CALL
DELISTED
Stamps.com, Inc.
STMP
| $4.09M | 0.01% |
549
-1,108
| -67% | -$65K |
|
836
CALL
CrowdStrike
CRWD
$187B
| $4.08M | 0.01% |
2,800
+2,100
| +300% | +$41.7K |
|
837
CALL
Westlake Corp
WLK
$9.46B
| $4.08M | 0.01% |
623
+252
| +68% | +$16.2K |
|
838
PUT
Bausch Health
BHC
$1.65B
| $4.08M | 0.01% |
1,865
-256
| -12% | -$5.86K |
|
839
CALL
Travelers Companies
TRV
$80.8B
| $4.07M | 0.01% |
274
+115
| +72% | +$17.1K |
|
840
CALL
McKesson
MCK
$98.5B
| $4.07M | 0.01% |
298
+39
| +15% | +$5.53K |
|
841
CALL
T-Mobile US
TMUS
$193B
| $4.07M | 0.01% |
517
-454
| -47% | -$35.6K |
|
842
PUT
Snap-on
SNA
$20.9B
| $4.07M | 0.01% |
260
+36
| +16% | +$5.53K |
|
843
CALL
Trip.com Group
TCOM
$27.5B
| $4.06M | 0.01% |
1,386
+620
| +81% | +$21.8K |
|
|
SPLK
844
DELISTED
Splunk Inc
SPLK
| $4.05M | 0.01% |
34,374
+26,675
| +346% | +$3.33M |
|
845
CALL
Kinder Morgan
KMI
$73.1B
| $4.05M | 0.01% |
1,964
+1,046
| +114% | +$21.5K |
|
846
CALL
Qiagen
QGEN
$8.53B
| $4.04M | 0.01% |
1,157
+605
| +110% | +$23.3K |
|
847
CALL
PTC
PTC
$13.7B
| $4.04M | 0.01% |
593
-67
| -10% | -$4.9K |
|
848
Automatic Data Processing
ADP
$100B
| $4.04M | 0.01% |
25,045
+12,075
| +93% | +$1.99M |
|
849
PUT
United States Natural Gas Fund
UNG
$470M
| $4.04M | 0.01% |
507
-28
| -5% | -$2.25K |
|
850
PUT
Realty Income
O
$61.2B
| $4.03M | 0.01% |
543
+82
| +18% | +$5.75K |
|
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.