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 | |
|---|---|---|---|---|---|---|
2626
CALL
MSC Industrial Direct
MSM
$6.96B
| $500K | ﹤0.01% |
69
+60
| +667% | +$4.2K |
|
2627
CALL
Coeur Mining
CDE
$15.6B
| $499K | ﹤0.01% |
1,039
-457
| -31% | -$2.26K |
|
2628
PUT
Funko
FNKO
$340M
| $499K | ﹤0.01% |
243
-121
| -33% | -$2.8K |
|
2629
CALL
Pilgrim's Pride
PPC
$7.01B
| $499K | ﹤0.01% |
156
-25
| -14% | -$726 |
|
2630
CALL
Coherus Oncology
CHRS
$228M
| $498K | ﹤0.01% |
246
+245
| +24,500% | +$4.89K |
|
2631
Fox Class A
FOXA
$24.1B
| $498K | ﹤0.01% |
+15,815
| New | +$547K |
|
2632
PUT
Scholastic
SCHL
$753M
| $498K | ﹤0.01% |
+132
| New | +$4.64K |
|
|
MRTX
2633
PUT
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $498K | ﹤0.01% |
64
-51
| -44% | -$4.79K |
|
|
PSXP
2634
CALL
DELISTED
PHILLIPS 66 PARTNERS LP
PSXP
| $498K | ﹤0.01% |
88
+1
| +1% | +$54 |
|
2635
BioMarin Pharmaceuticals
BMRN
$11.7B
| $497K | ﹤0.01% |
+7,375
| New | +$568K |
|
2636
CALL
Broadridge
BR
$17.8B
| $497K | ﹤0.01% |
40
-273
| -87% | -$35.2K |
|
|
PE
2637
CALL
DELISTED
PARSLEY ENERGY INC
PE
| $497K | ﹤0.01% |
296
+10
| +3% | +$172 |
|
2638
CALL
Fabrinet
FN
$16.5B
| $496K | ﹤0.01% |
95
+65
| +217% | +$3.41K |
|
2639
CALL
Solid Biosciences
SLDB
$790M
| $496K | ﹤0.01% |
32
+16
| +100% | +$1.81K |
|
2640
CALL
Vishay Intertechnology
VSH
$5.51B
| $496K | ﹤0.01% |
293
+59
| +25% | +$968 |
|
2641
Amphenol
APH
$182B
| $495K | ﹤0.01% |
20,540
-11,704
| -36% | -$270K |
|
|
NS
2642
PUT
DELISTED
NuStar Energy L.P.
NS
| $495K | ﹤0.01% |
175
+45
| +35% | +$1.25K |
|
2643
PUT
Black Stone Minerals
BSM
$3.18B
| $494K | ﹤0.01% |
347
+35
| +11% | +$513 |
|
2644
CALL
Kratos Defense & Security Solutions
KTOS
$9.17B
| $494K | ﹤0.01% |
266
-238
| -47% | -$5K |
|
2645
Exponent
EXPO
$3.06B
| $493K | ﹤0.01% |
+7,058
| New | +$476K |
|
2646
CALL
JELD-WEN Holding
JELD
$99.1M
| $493K | ﹤0.01% |
256
+243
| +1,869% | +$4.7K |
|
2647
PUT
UroGen Pharma
URGN
$1.97B
| $493K | ﹤0.01% |
+207
| New | +$6.77K |
|
2648
CALL
Globus Medical
GMED
$10.7B
| $490K | ﹤0.01% |
96
-47
| -33% | -$2.24K |
|
2649
PUT
Murphy Oil
MUR
$5.44B
| $490K | ﹤0.01% |
222
+196
| +754% | +$4.21K |
|
2650
PUT
Diodes
DIOD
$3.85B
| $489K | ﹤0.01% |
122
+76
| +165% | +$2.94K |
|
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.