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 | |
|---|---|---|---|---|---|---|
2026
Arrowhead Research
ARWR
$12.1B
| $903K | ﹤0.01% |
32,069
-14,909
| -32% | -$441K |
|
2027
CALL
Cogent Communications
CCOI
$594M
| $903K | ﹤0.01% |
164
+101
| +160% | +$6.02K |
|
2028
PUT
Tanger
SKT
$4.82B
| $902K | ﹤0.01% |
583
+402
| +222% | +$6.29K |
|
2029
PUT
BlackBerry
BB
$5.01B
| $901K | ﹤0.01% |
1,717
+279
| +19% | +$1.96K |
|
2030
PUT
Fastly Inc
FSLY
$3.17B
| $900K | ﹤0.01% |
375
+343
| +1,072% | +$8.08K |
|
2031
CALL
Lennox International
LII
$18.8B
| $898K | ﹤0.01% |
37
| – | – |
|
2032
QuidelOrtho
QDEL
$1.09B
| $898K | ﹤0.01% |
14,651
+12,123
| +480% | +$729K |
|
2033
Teledyne Technologies
TDY
$30.4B
| $898K | ﹤0.01% |
2,792
+2,666
| +2,116% | +$796K |
|
2034
ProShares UltraPro Dow 30
UDOW
$849M
| $898K | ﹤0.01% |
34,192
-18,216
| -35% | -$469K |
|
2035
CALL
Consolidated Edison
ED
$41.6B
| $897K | ﹤0.01% |
95
-91
| -49% | -$8.08K |
|
2036
PUT
Viper Energy
VNOM
$8.81B
| $896K | ﹤0.01% |
324
+155
| +92% | +$4.62K |
|
|
VAL
2037
PUT
DELISTED
Valaris plc Class A Ordinary Share
VAL
| $896K | ﹤0.01% |
+1,865
| New | +$10K |
|
2038
Global X Silver Miners ETF NEW
SIL
$4.08B
| $895K | ﹤0.01% |
31,861
+23,460
| +279% | +$676K |
|
|
SBNY
2039
PUT
DELISTED
Signature Bank
SBNY
| $894K | ﹤0.01% |
75
-22
| -23% | -$2.66K |
|
2040
CALL
Cenovus Energy
CVE
$54.6B
| $893K | ﹤0.01% |
953
-305
| -24% | -$2.77K |
|
2041
Banco Santander
SAN
$194B
| $893K | ﹤0.01% |
231,939
+16,227
| +8% | +$64.4K |
|
|
NEWR
2042
CALL
DELISTED
New Relic, Inc.
NEWR
| $891K | ﹤0.01% |
145
+114
| +368% | +$8.24K |
|
|
SC
2043
PUT
DELISTED
SANTANDER CONSUMER USA HOLDINGS INC
SC
| $890K | ﹤0.01% |
349
-106
| -23% | -$2.76K |
|
2044
Nektar Therapeutics
NKTR
$2.39B
| $888K | ﹤0.01% |
3,250
+2,625
| +420% | +$963K |
|
2045
CALL
Citizens Financial Group
CFG
$30.4B
| $887K | ﹤0.01% |
251
-317
| -56% | -$11.1K |
|
2046
PUT
Steven Madden
SHOO
$3.12B
| $887K | ﹤0.01% |
248
+201
| +428% | +$6.64K |
|
2047
PUT
Casey's General Stores
CASY
$31.9B
| $886K | ﹤0.01% |
55
-28
| -34% | -$4.61K |
|
2048
PUT
Valmont Industries
VMI
$9.44B
| $886K | ﹤0.01% |
64
-5
| -7% | -$671 |
|
|
MXIM
2049
PUT
DELISTED
Maxim Integrated Products
MXIM
| $886K | ﹤0.01% |
153
+10
| +7% | +$579 |
|
2050
CALL
Grand Canyon Education
LOPE
$3.71B
| $883K | ﹤0.01% |
90
+13
| +17% | +$1.55K |
|
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.