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 |
iShares Russell 2000 ETF
IWM
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3076
PUT
GoPro
GPRO
$119M
| $219K | ﹤0.01% |
518
-1,398
| -73% | -$7.82K |
|
3077
Gyre Therapeutics
GYRE
$683M
| $219K | ﹤0.01% |
3,716
+3,150
| +557% | +$232K |
|
3078
Hain Celestial
HAIN
$46M
| $219K | ﹤0.01% |
13,864
-26,231
| -65% | -$584K |
|
3079
CALL
Prospect Capital
PSEC
$1.12B
| $219K | ﹤0.01% |
348
+323
| +1,292% | +$2.18K |
|
3080
CALL
QuidelOrtho
QDEL
$1.15B
| $219K | ﹤0.01% |
45
+30
| +200% | +$1.79K |
|
3081
CALL
Revvity
RVTY
$12.1B
| $219K | ﹤0.01% |
28
-62
| -69% | -$5.24K |
|
3082
Valley National Bancorp
VLY
$7.94B
| $219K | ﹤0.01% |
+24,707
| New | +$249K |
|
|
TRTN
3083
DELISTED
Triton International Limited
TRTN
| $219K | ﹤0.01% |
7,070
+2,120
| +43% | +$68.4K |
|
3084
PUT
Brunswick
BC
$5.24B
| $218K | ﹤0.01% |
47
+42
| +840% | +$2.25K |
|
|
BHR
3085
PUT
Braemar Hotels & Resorts
BHR
$157M
| $218K | ﹤0.01% |
247
-20
| -7% | -$199 |
|
3086
CALL
MakeMyTrip
MMYT
$4.97B
| $218K | ﹤0.01% |
90
+9
| +11% | +$216 |
|
3087
PUT
Omeros
OMER
$821M
| $218K | ﹤0.01% |
196
+152
| +345% | +$2.13K |
|
3088
PUT
OneMain Financial
OMF
$7.08B
| $218K | ﹤0.01% |
90
+58
| +181% | +$1.65K |
|
|
ATSG
3089
PUT
DELISTED
Air Transport Services Group
ATSG
| $218K | ﹤0.01% |
96
+81
| +540% | +$1.59K |
|
|
AAN.A
3090
CALL
DELISTED
The Aaron's Company Inc Class A
AAN.A
| $218K | ﹤0.01% |
52
-1
| -2% | -$4.19K |
|
3091
CALL
Masco
MAS
$16.4B
| $216K | ﹤0.01% |
74
-153
| -67% | -$4.75K |
|
|
3092
PUT
Masco
MAS
$16.4B
| $216K | ﹤0.01% |
74
-114
| -61% | -$3.54K |
|
3093
National Grid
NGG
$81.6B
| $216K | ﹤0.01% |
+5,111
| New | +$239K |
|
3094
Prothena Corp
PRTA
$455M
| $216K | ﹤0.01% |
21,037
+874
| +4% | +$10.4K |
|
|
SCG
3095
CALL
DELISTED
Scana
SCG
| $216K | ﹤0.01% |
891
+586
| +192% | +$25.2K |
|
|
BLD
3096
DELISTED
TopBuild
BLD
| $215K | ﹤0.01% |
4,787
+2,185
| +84% | +$106K |
|
3097
Manulife Financial
MFC
$73.2B
| $215K | ﹤0.01% |
+15,153
| New | +$240K |
|
3098
CALL
SLM Corp
SLM
$4.78B
| $215K | ﹤0.01% |
259
+239
| +1,195% | +$2.38K |
|
|
IPHI
3099
CALL
DELISTED
INPHI CORPORATION
IPHI
| $215K | ﹤0.01% |
67
+49
| +272% | +$1.7K |
|
3100
PUT
HP
HPQ
$24.3B
| $214K | ﹤0.01% |
105
-1,354
| -93% | -$31.6K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.