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 |
Microsoft
MSFT
|
+$53.9M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$52.9M |
| 3 |
NVIDIA
NVDA
|
+$47.1M |
| 4 |
PayPal
PYPL
|
+$41.7M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$28.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$51.4M |
| 2 |
Walmart Inc
WMT
|
+$46.4M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$34.2M |
| 4 |
Adobe
ADBE
|
+$33.5M |
| 5 |
Starbucks
SBUX
|
+$26.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Healthcare | 0.21% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.2% |
| 5 | Financials | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3026
CALL
PTC Therapeutics
PTCT
$6.29B
| $654K | ﹤0.01% |
16,100
-7,300
| -31% | -$357K |
|
3027
CALL
Freshworks
FRSH
$2.99B
| $653K | ﹤0.01% |
37,200
+14,200
| +62% | +$214K |
|
3028
CALL
Jack in the Box
JACK
$299M
| $653K | ﹤0.01% |
6,700
-1,600
| -19% | -$146K |
|
3029
PUT
Schrodinger
SDGR
$1.14B
| $653K | ﹤0.01% |
13,100
+7,300
| +126% | +$247K |
|
|
MASI
3030
DELISTED
Masimo
MASI
| $652K | ﹤0.01% |
3,965
+630
| +19% | +$110K |
|
3031
PUT
Sabre
SABR
$704M
| $652K | ﹤0.01% |
204,700
+191,600
| +1,463% | +$692K |
|
3032
CALL
Sprouts Farmers Market
SFM
$7.23B
| $650K | ﹤0.01% |
17,700
+2,500
| +16% | +$87.3K |
|
3033
PUT
Fabrinet
FN
$16.9B
| $649K | ﹤0.01% |
5,000
-7,500
| -60% | -$801K |
|
3034
PUT
Fresenius Medical Care
FMS
$13.4B
| $648K | ﹤0.01% |
27,100
+13,600
| +101% | +$312K |
|
3035
PUT
Dycom Industries
DY
$12.7B
| $647K | ﹤0.01% |
5,700
-4,400
| -44% | -$435K |
|
3036
PUT
Aldeyra Therapeutics
ALDX
$95.3M
| $646K | ﹤0.01% |
77,000
+13,500
| +21% | +$133K |
|
3037
Wynn Resorts
WYNN
$10.3B
| $646K | ﹤0.01% |
+6,117
| New | +$655K |
|
3038
PUT
Westlake Corp
WLK
$9.27B
| $645K | ﹤0.01% |
5,400
+2,700
| +100% | +$309K |
|
3039
Invesco Senior Loan ETF
BKLN
$6.97B
| $644K | ﹤0.01% |
+30,617
| New | +$638K |
|
3040
PUT
Hecla Mining
HL
$10.2B
| $643K | ﹤0.01% |
124,900
+13,200
| +12% | +$75.4K |
|
3041
CALL
Lattice Semiconductor
LSCC
$16.8B
| $643K | ﹤0.01% |
6,700
-48,400
| -88% | -$4.16M |
|
3042
CALL
Tenaris
TS
$28.5B
| $643K | ﹤0.01% |
21,500
+16,000
| +291% | +$444K |
|
|
WW
3043
PUT
DELISTED
WW International
WW
| $643K | ﹤0.01% |
95,800
-14,900
| -13% | -$106K |
|
3044
Amplify Energy
AMPY
$155M
| $642K | ﹤0.01% |
94,832
+35,870
| +61% | +$250K |
|
3045
PUT
Evercore
EVR
$13.2B
| $642K | ﹤0.01% |
5,200
+1,300
| +33% | +$150K |
|
|
ETNB
3046
DELISTED
89bio
ETNB
| $641K | ﹤0.01% |
33,858
-123,842
| -79% | -$2.17M |
|
3047
CALL
Expeditors International
EXPD
$22.4B
| $641K | ﹤0.01% |
5,300
+4,900
| +1,225% | +$557K |
|
3048
AdvisorShares Pure US Cannabis ETF
MSOS
$860M
| $641K | ﹤0.01% |
115,823
-226,190
| -66% | -$1.24M |
|
3049
CALL
Taboola.com
TBLA
$1.35B
| $641K | ﹤0.01% |
206,200
-6,400
| -3% | -$17.5K |
|
3050
CALL
Planet Fitness
PLNT
$4.29B
| $640K | ﹤0.01% |
9,500
-62,200
| -87% | -$4.46M |
|
Similar funds
Simplex Trading's Q2 2023 Portfolio in Review
As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
- Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
- Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
- Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
- Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
- Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.
Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.