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 |
SPDR Gold Trust
GLD
|
+$31.6M |
| 2 |
iShares Silver Trust
SLV
|
+$28.1M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.1M |
| 4 |
JPMorgan Chase
JPM
|
+$24.5M |
| 5 |
Direxion Daily Junior Gold Miners Index Bull 2X ETF
JNUG
|
+$24M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$51.6M |
| 2 |
Amazon
AMZN
|
+$47.4M |
| 3 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$44.7M |
| 4 |
Netflix
NFLX
|
+$38.3M |
| 5 |
NVIDIA
NVDA
|
+$31.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.49% |
| 2 | Healthcare | 0.33% |
| 3 | Consumer Discretionary | 0.32% |
| 4 | Financials | 0.16% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
NLSN
1976
PUT
DELISTED
Nielsen Holdings plc
NLSN
| $907K | ﹤0.01% |
724
-151
| -17% | -$2.83K |
|
|
SUM
1977
DELISTED
Summit Materials, Inc. Class A Common Stock
SUM
| $905K | ﹤0.01% |
+61,373
| New | +$1.19M |
|
|
MNK
1978
PUT
DELISTED
MALLINCKRODT PUBLIC LIMITED COMPANY
MNK
| $904K | ﹤0.01% |
4,570
+3,832
| +519% | +$14.5K |
|
1979
PUT
Arrowhead Research
ARWR
$12.1B
| $903K | ﹤0.01% |
314
-582
| -65% | -$23.5K |
|
|
IPHI
1980
CALL
DELISTED
INPHI CORPORATION
IPHI
| $902K | ﹤0.01% |
114
+64
| +128% | +$4.97K |
|
1981
CALL
Ally Financial
ALLY
$13.1B
| $900K | ﹤0.01% |
624
-168
| -21% | -$4.41K |
|
1982
CALL
Canadian Pacific Kansas City
CP
$82B
| $900K | ﹤0.01% |
205
-320
| -61% | -$15.8K |
|
1983
CALL
Weibo
WB
$1.9B
| $900K | ﹤0.01% |
272
-763
| -74% | -$32.3K |
|
1984
PUT
Deckers Outdoor
DECK
$13.3B
| $897K | ﹤0.01% |
402
-156
| -28% | -$4.34K |
|
1985
CALL
Mettler-Toledo International
MTD
$26.8B
| $897K | ﹤0.01% |
13
+5
| +63% | +$3.73K |
|
1986
CALL
Rithm Capital
RITM
$5.09B
| $897K | ﹤0.01% |
1,792
+127
| +8% | +$1.84K |
|
1987
PUT
American Water Works
AWK
$26.3B
| $896K | ﹤0.01% |
75
-161
| -68% | -$20.8K |
|
1988
CALL
Nordic American Tanker
NAT
$1.37B
| $896K | ﹤0.01% |
1,978
+1,326
| +203% | +$4.78K |
|
1989
Roku
ROKU
$21.1B
| $895K | ﹤0.01% |
+10,233
| New | +$1.18M |
|
|
SA
1990
PUT
Seabridge Gold
SA
$2.8B
| $894K | ﹤0.01% |
957
-59
| -6% | -$698 |
|
1991
Ascendis Pharma A/S
ASND
$16.7B
| $893K | ﹤0.01% |
+7,934
| New | +$1.03M |
|
1992
CALL
HEICO Corp Class A
HEI.A
$35.4B
| $893K | ﹤0.01% |
120
+110
| +1,100% | +$9.83K |
|
1993
PUT
Neurocrine Biosciences
NBIX
$17.7B
| $891K | ﹤0.01% |
103
+72
| +232% | +$7.05K |
|
1994
CALL
Cincinnati Financial
CINF
$28.3B
| $890K | ﹤0.01% |
118
+56
| +90% | +$5.58K |
|
1995
Walt Disney
DIS
$165B
| $889K | ﹤0.01% |
9,203
-20,143
| -69% | -$2.55M |
|
1996
Invesco Solar ETF
TAN
$1.47B
| $889K | ﹤0.01% |
35,254
+25,317
| +255% | +$826K |
|
1997
CALL
Carter's
CRI
$1.43B
| $887K | ﹤0.01% |
135
-94
| -41% | -$9.05K |
|
1998
Fortinet
FTNT
$112B
| $887K | ﹤0.01% |
43,840
-3,390
| -7% | -$72.6K |
|
1999
CALL
Invesco Aerospace & Defense ETF
PPA
$8.27B
| $887K | ﹤0.01% |
211
-3
| -1% | -$195 |
|
2000
PUT
Watsco Inc
WSO
$14.9B
| $884K | ﹤0.01% |
56
-6
| -10% | -$1.01K |
|
Similar funds
Simplex Trading's Q1 2020 Portfolio in Review
As of Q1 2020, Simplex Trading held 8,783 positions worth $56.7B, up 24% from $45.7B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q1 2020 filing shows 1,512 new, 3,249 increased, 2,705 reduced and 1,159 closed positions. Its largest new stake was SPDR Gold Trust: 212,230 shares worth $31.4M. The largest sale was Alphabet (Google) Class C, an estimated $51.6M.
By sector, the portfolio is most concentrated in Technology at 0.49% of assets, down from 0.75% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2020 buy was SPDR Gold Trust: 212,230 shares worth $31.4M.
- Simplex Trading added most to JPMorgan Chase in Q1 2020, an estimated $24.5M increase.
- Simplex Trading's biggest Q1 2020 reduction was Amazon, cutting an estimated $47.4M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2020, selling an estimated $51.6M.
- Simplex Trading's ten largest holdings make up 50% of its $56.7B portfolio in Q1 2020.
- Simplex Trading opened 1,512 new positions and closed 1,159 in Q1 2020.
- Simplex Trading's portfolio value rose 24% quarter-over-quarter to $56.7B.
Based on Simplex Trading's 13F filing for Q1 2020, filed 29 Apr 2020.