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 | |
|---|---|---|---|---|---|---|
|
CMBT
3176
CMB.TECH NV
CMBT
$4.46B
| $565K | ﹤0.01% |
+37,133
| New | +$605K |
|
3177
CALL
Elbit Systems
ESLT
$38.1B
| $564K | ﹤0.01% |
+2,700
| New | +$523K |
|
3178
CALL
Mattel
MAT
$4.3B
| $564K | ﹤0.01% |
28,900
+10,300
| +55% | +$186K |
|
3179
PUT
Progress Software
PRGS
$1.59B
| $563K | ﹤0.01% |
+9,700
| New | +$551K |
|
|
DADA
3180
PUT
DELISTED
Dada Nexus
DADA
| $562K | ﹤0.01% |
105,900
-8,200
| -7% | -$49.7K |
|
3181
CALL
Stratasys
SSYS
$700M
| $562K | ﹤0.01% |
31,700
+2,600
| +9% | +$40.7K |
|
|
SPR
3182
DELISTED
Spirit AeroSystems
SPR
| $561K | ﹤0.01% |
19,245
-3,726
| -16% | -$107K |
|
3183
PUT
Invitation Homes
INVH
$17.6B
| $560K | ﹤0.01% |
16,300
-76,800
| -82% | -$2.57M |
|
3184
CALL
ACV Auctions
ACVA
$1.4B
| $559K | ﹤0.01% |
32,400
-29,700
| -48% | -$454K |
|
3185
CALL
Asure Software
ASUR
$222M
| $559K | ﹤0.01% |
46,000
+37,200
| +423% | +$495K |
|
3186
CALL
SkinHealth Systems
SKIN
$96.9M
| $559K | ﹤0.01% |
66,900
+49,400
| +282% | +$513K |
|
3187
PUT
Alta Equipment Group
ALTG
$208M
| $558K | ﹤0.01% |
32,200
-4,300
| -12% | -$63.5K |
|
3188
CALL
Integer Holdings
ITGR
$3.38B
| $558K | ﹤0.01% |
6,300
+5,000
| +385% | +$409K |
|
3189
CALL
News Corp Class B
NWS
$16.8B
| $558K | ﹤0.01% |
28,700
+5,200
| +22% | +$95.1K |
|
3190
PUT
Sprouts Farmers Market
SFM
$7.23B
| $558K | ﹤0.01% |
15,200
+8,200
| +117% | +$286K |
|
3191
PUT
Axalta
AXTA
$7.22B
| $557K | ﹤0.01% |
17,000
+13,700
| +415% | +$425K |
|
3192
PUT
Buckle
BKE
$2.25B
| $557K | ﹤0.01% |
16,100
-4,600
| -22% | -$154K |
|
|
WIRE
3193
PUT
DELISTED
Encore Wire Corp
WIRE
| $557K | ﹤0.01% |
3,000
+1,100
| +58% | +$186K |
|
3194
PUT
Cathay General Bancorp
CATY
$4.18B
| $556K | ﹤0.01% |
17,300
+15,400
| +811% | +$489K |
|
3195
PUT
JPMorgan Inflation Managed Bond ETF
JCPI
$868M
| $556K | ﹤0.01% |
11,500
-12,200
| -51% | -$571K |
|
3196
CALL
MannKind Corp
MNKD
$1.22B
| $556K | ﹤0.01% |
136,800
-111,500
| -45% | -$465K |
|
3197
Viridian Therapeutics
VRDN
$2.18B
| $556K | ﹤0.01% |
23,380
+22,821
| +4,082% | +$585K |
|
3198
CALL
Camtek
CAMT
$7.07B
| $555K | ﹤0.01% |
15,600
+14,200
| +1,014% | +$407K |
|
3199
PUT
Teradata
TDC
$2.8B
| $555K | ﹤0.01% |
10,400
-30,700
| -75% | -$1.38M |
|
3200
CALL
AbCellera Biologics
ABCL
$1.6B
| $554K | ﹤0.01% |
85,800
-27,200
| -24% | -$186K |
|
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.