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 | |
|---|---|---|---|---|---|---|
1201
PUT
Healthpeak Properties
DOC
$15.3B
| $5.95M | ﹤0.01% |
296,000
+294,900
| +26,809% | +$6.12M |
|
1202
PUT
PennyMac Financial
PFSI
$4.38B
| $5.95M | ﹤0.01% |
84,600
+15,100
| +22% | +$956K |
|
1203
PUT
iShares Convertible Bond ETF
ICVT
$7.29B
| $5.94M | ﹤0.01% |
187,900
-469,300
| -71% | -$34.2M |
|
1204
CALL
Alexandria Real Estate Equities
ARE
$8.85B
| $5.93M | ﹤0.01% |
52,300
+41,800
| +398% | +$4.98M |
|
1205
CALL
Cognizant
CTSH
$21.1B
| $5.93M | ﹤0.01% |
90,800
-41,300
| -31% | -$2.56M |
|
1206
CALL
Ambarella
AMBA
$2.95B
| $5.92M | ﹤0.01% |
70,800
+10,100
| +17% | +$739K |
|
1207
PUT
Teradyne
TER
$56B
| $5.92M | ﹤0.01% |
53,200
+25,300
| +91% | +$2.54M |
|
|
SPR
1208
CALL
DELISTED
Spirit AeroSystems
SPR
| $5.92M | ﹤0.01% |
202,700
+60,300
| +42% | +$1.74M |
|
|
AXON
1209
PUT
Axon Enterprise
AXON
$40.1B
| $5.89M | ﹤0.01% |
30,200
-46,700
| -61% | -$9.67M |
|
|
SGI
1210
PUT
Somnigroup International
SGI
$15.1B
| $5.87M | ﹤0.01% |
146,600
+13,100
| +10% | +$493K |
|
1211
PUT
Universal Display
OLED
$3.7B
| $5.87M | ﹤0.01% |
40,700
+28,600
| +236% | +$4.1M |
|
1212
CALL
TransUnion
TRU
$14.6B
| $5.87M | ﹤0.01% |
74,900
-11,500
| -13% | -$796K |
|
1213
CALL
BridgeBio Pharma
BBIO
$16.6B
| $5.86M | ﹤0.01% |
340,800
+115,400
| +51% | +$1.74M |
|
1214
CALL
Chubb
CB
$138B
| $5.85M | ﹤0.01% |
30,400
-19,200
| -39% | -$3.76M |
|
1215
CALL
Bank OZK
OZK
$5.49B
| $5.82M | ﹤0.01% |
144,900
+14,600
| +11% | +$524K |
|
1216
PUT
Marqeta
MQ
$1.79B
| $5.8M | ﹤0.01% |
297,975
-39,025
| -12% | -$708K |
|
|
FTCH
1217
DELISTED
Farfetch Limited Class A Ordinary Shares
FTCH
| $5.79M | ﹤0.01% |
958,271
+193,466
| +25% | +$932K |
|
1218
PUT
Match Group
MTCH
$8.9B
| $5.78M | ﹤0.01% |
138,100
-247,700
| -64% | -$9.06M |
|
1219
PUT
First Citizens BancShares
FCNCA
$24.8B
| $5.78M | ﹤0.01% |
4,500
-9,600
| -68% | -$11.1M |
|
|
IMGN
1220
DELISTED
Immunogen Inc
IMGN
| $5.77M | ﹤0.01% |
305,978
+186,966
| +157% | +$2.21M |
|
1221
Comcast
CMCSA
$79.5B
| $5.77M | ﹤0.01% |
138,852
+65,168
| +88% | +$2.59M |
|
1222
CALL
Wabtec
WAB
$50.8B
| $5.77M | ﹤0.01% |
52,600
+5,100
| +11% | +$506K |
|
1223
Goodyear
GT
$2.07B
| $5.74M | ﹤0.01% |
419,720
+96,688
| +30% | +$1.21M |
|
1224
CALL
Alpha Metallurgical Resources
AMR
$1.8B
| $5.74M | ﹤0.01% |
34,900
-9,400
| -21% | -$1.44M |
|
|
LAZR
1225
CALL
DELISTED
Luminar Technologies
LAZR
| $5.72M | ﹤0.01% |
55,473
-5,454
| -9% | -$515K |
|
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.