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 | |
|---|---|---|---|---|---|---|
|
MAXN
1951
CALL
DELISTED
Maxeon Solar Technologies
MAXN
| $2.08M | ﹤0.01% |
738
+35
| +5% | +$100K |
|
1952
PUT
Roper Technologies
ROP
$36.3B
| $2.07M | ﹤0.01% |
4,300
+2,300
| +115% | +$1.04M |
|
1953
Apollo Global Management
APO
$70.7B
| $2.06M | ﹤0.01% |
26,887
-132,817
| -83% | -$8.88M |
|
1954
CALL
Xponential Fitness
XPOF
$265M
| $2.06M | ﹤0.01% |
119,700
+70,800
| +145% | +$2M |
|
|
GTLS
1955
PUT
DELISTED
Chart Industries
GTLS
| $2.06M | ﹤0.01% |
12,900
+7,600
| +143% | +$971K |
|
1956
PUT
Melco Resorts & Entertainment
MLCO
$2.1B
| $2.06M | ﹤0.01% |
168,500
+28,500
| +20% | +$353K |
|
1957
CALL
Fluence Energy
FLNC
$1.78B
| $2.05M | ﹤0.01% |
77,100
+13,700
| +22% | +$306K |
|
1958
PUT
Star Bulk Carriers
SBLK
$3.14B
| $2.05M | ﹤0.01% |
116,000
-422,200
| -78% | -$8.13M |
|
1959
Medtronic
MDT
$107B
| $2.05M | ﹤0.01% |
23,255
-40,523
| -64% | -$3.49M |
|
1960
Weibo
WB
$1.9B
| $2.05M | ﹤0.01% |
156,195
+37,312
| +31% | +$593K |
|
1961
CALL
Neurocrine Biosciences
NBIX
$17.7B
| $2.05M | ﹤0.01% |
21,700
+18,600
| +600% | +$1.82M |
|
1962
CALL
NNN REIT
NNN
$9.39B
| $2.04M | ﹤0.01% |
47,800
-1,400
| -3% | -$60.2K |
|
1963
CALL
Alaska Air
ALK
$5.15B
| $2.04M | ﹤0.01% |
38,300
-23,300
| -38% | -$1.06M |
|
1964
PUT
FLEX LNG
FLNG
$1.67B
| $2.04M | ﹤0.01% |
66,700
-9,600
| -13% | -$307K |
|
|
MAXN
1965
PUT
DELISTED
Maxeon Solar Technologies
MAXN
| $2.04M | ﹤0.01% |
723
+56
| +8% | +$160K |
|
|
TE
1966
PUT
T1 Energy
TE
$1.4B
| $2.03M | ﹤0.01% |
217,300
-42,600
| -16% | -$320K |
|
1967
PUT
Honda
HMC
$36.5B
| $2.02M | ﹤0.01% |
66,800
-23,500
| -26% | -$663K |
|
1968
PUT
Magna International
MGA
$17.9B
| $2.02M | ﹤0.01% |
35,800
-6,400
| -15% | -$339K |
|
1969
CALL
Sociedad Química y Minera de Chile
SQM
$19.6B
| $2.02M | ﹤0.01% |
27,800
-16,600
| -37% | -$1.18M |
|
1970
PUT
Louisiana-Pacific
LPX
$5.2B
| $2.02M | ﹤0.01% |
26,900
-20,600
| -43% | -$1.27M |
|
|
EWCZ
1971
CALL
DELISTED
European Wax Center
EWCZ
| $2.01M | ﹤0.01% |
108,000
+57,700
| +115% | +$1.03M |
|
|
1972
PUT
Sociedad Química y Minera de Chile
SQM
$19.6B
| $2M | ﹤0.01% |
27,600
-8,900
| -24% | -$633K |
|
1973
CALL
Danaos Corp
DAC
$2.55B
| $2M | ﹤0.01% |
30,000
+20,000
| +200% | +$1.21M |
|
1974
CALL
Aramark
ARMK
$15B
| $2M | ﹤0.01% |
64,403
+34,764
| +117% | +$947K |
|
1975
Impinj
PI
$3.89B
| $2M | ﹤0.01% |
+22,321
| New | +$2.38M |
|
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.