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 | |
|---|---|---|---|---|---|---|
1501
PUT
Williams-Sonoma
WSM
$26.7B
| $1.64M | ﹤0.01% |
482
+264
| +121% | +$8.74K |
|
1502
CALL
HCA Healthcare
HCA
$84.8B
| $1.64M | ﹤0.01% |
136
-134
| -50% | -$17.3K |
|
1503
PUT
Avis
CAR
$5.63B
| $1.64M | ﹤0.01% |
579
-635
| -52% | -$19.5K |
|
|
MXIM
1504
CALL
DELISTED
Maxim Integrated Products
MXIM
| $1.63M | ﹤0.01% |
282
-174
| -38% | -$10.1K |
|
|
VIAB
1505
DELISTED
Viacom Inc. Class B
VIAB
| $1.63M | ﹤0.01% |
67,877
+43,810
| +182% | +$1.22M |
|
1506
PUT
Signet Jewelers
SIG
$3.55B
| $1.63M | ﹤0.01% |
973
-476
| -33% | -$7.48K |
|
1507
CALL
Entegris
ENTG
$19.7B
| $1.63M | ﹤0.01% |
346
-133
| -28% | -$5.61K |
|
1508
PUT
Gen Digital
GEN
$15.6B
| $1.63M | ﹤0.01% |
689
+3
| +0.4% | +$70 |
|
1509
PUT
Corning
GLW
$126B
| $1.62M | ﹤0.01% |
569
+68
| +14% | +$2.04K |
|
1510
TransDigm Group
TDG
$69.2B
| $1.62M | ﹤0.01% |
+3,114
| New | +$1.6M |
|
1511
ProShares UltraPro QQQ
TQQQ
$31.1B
| $1.62M | ﹤0.01% |
+210,288
| New | +$1.67M |
|
1512
PUT
Popular Inc
BPOP
$11B
| $1.62M | ﹤0.01% |
299
-148
| -33% | -$8.02K |
|
1513
CALL
Amplify Junior Silver Miners ETF
SILJ
$3.27B
| $1.61M | ﹤0.01% |
770
+176
| +30% | +$1.76K |
|
|
TWO
1514
CALL
Two Harbors Investment
TWO
$1.27B
| $1.61M | ﹤0.01% |
307
+216
| +237% | +$11.4K |
|
1515
PUT
NIO
NIO
$11.3B
| $1.61M | ﹤0.01% |
10,324
+3,918
| +61% | +$12K |
|
1516
CALL
Corteva
CTVA
$59.7B
| $1.61M | ﹤0.01% |
574
-361
| -39% | -$10.4K |
|
1517
CALL
Zimmer Biomet
ZBH
$17.7B
| $1.61M | ﹤0.01% |
121
+61
| +102% | +$7.88K |
|
1518
CALL
Guardant Health
GH
$19.5B
| $1.6M | ﹤0.01% |
251
+38
| +18% | +$3.35K |
|
1519
CoStar Group
CSGP
$11.3B
| $1.6M | ﹤0.01% |
27,000
-21,840
| -45% | -$1.31M |
|
1520
PUT
Trane Technologies
TT
$106B
| $1.6M | ﹤0.01% |
130
+22
| +20% | +$2.69K |
|
|
LL
1521
CALL
DELISTED
LL Flooring Holdings, Inc.
LL
| $1.6M | ﹤0.01% |
1,623
+1,298
| +399% | +$12.7K |
|
1522
CALL
Ziff Davis
ZD
$1.9B
| $1.6M | ﹤0.01% |
202
+86
| +74% | +$6.52K |
|
|
SA
1523
PUT
Seabridge Gold
SA
$2.8B
| $1.6M | ﹤0.01% |
1,262
+825
| +189% | +$11.7K |
|
|
CS
1524
DELISTED
Credit Suisse Group
CS
| $1.6M | ﹤0.01% |
130,842
+63,575
| +95% | +$764K |
|
|
FRC
1525
CALL
DELISTED
First Republic Bank
FRC
| $1.59M | ﹤0.01% |
165
-495
| -75% | -$46.9K |
|
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.