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
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2026
NetEase
NTES
$76.5B
| $2.68M | ﹤0.01% |
17,621
+5,936
| +51% | +$817K |
|
2027
Norfolk Southern
NSC
$78.8B
| $2.68M | ﹤0.01% |
8,912
-1,049
| -11% | -$291K |
|
2028
CALL
Richtech Robotics
RR
$347M
| $2.68M | ﹤0.01% |
+623,800
| New | +$1.64M |
|
2029
CALL
Jefferies Financial Group
JEF
$12.9B
| $2.67M | ﹤0.01% |
40,900
-15,300
| -27% | -$933K |
|
|
FETH
2030
CALL
Fidelity Ethereum Fund
FETH
$1B
| $2.67M | ﹤0.01% |
64,400
+6,900
| +12% | +$270K |
|
2031
PUT
PACCAR
PCAR
$69.6B
| $2.67M | ﹤0.01% |
27,200
-16,800
| -38% | -$1.66M |
|
|
WBTN
2032
PUT
WEBTOON Entertainment Inc
WBTN
$1.22B
| $2.67M | ﹤0.01% |
+137,800
| New | +$1.84M |
|
2033
PUT
Planet Fitness
PLNT
$4.23B
| $2.67M | ﹤0.01% |
25,700
-8,400
| -25% | -$893K |
|
2034
PUT
Rambus
RMBS
$10.4B
| $2.67M | ﹤0.01% |
25,600
-79,900
| -76% | -$6.16M |
|
|
LAZR
2035
CALL
DELISTED
Luminar Technologies
LAZR
| $2.67M | ﹤0.01% |
1,395,400
+305,400
| +28% | +$749K |
|
2036
Royal Gold
RGLD
$17.1B
| $2.66M | ﹤0.01% |
13,283
+10,791
| +433% | +$1.87M |
|
2037
CALL
Sportradar
SRAD
$4.23B
| $2.66M | ﹤0.01% |
98,900
+59,800
| +153% | +$1.77M |
|
|
2038
CALL
NetEase
NTES
$76.5B
| $2.66M | ﹤0.01% |
17,500
-5,100
| -23% | -$702K |
|
2039
CALL
TechnipFMC
FTI
$30.6B
| $2.66M | ﹤0.01% |
67,400
+13,300
| +25% | +$487K |
|
|
HAPN
2040
CALL
Happen Inc
HAPN
$2.08B
| $2.64M | ﹤0.01% |
174,100
+90,700
| +109% | +$1.38M |
|
|
CDTX
2041
PUT
DELISTED
Cidara Therapeutics
CDTX
| $2.64M | ﹤0.01% |
27,600
-79,800
| -74% | -$5.09M |
|
2042
PUT
Tilray
TLRY
$479M
| $2.64M | ﹤0.01% |
152,700
+37,460
| +33% | +$358K |
|
2043
PUT
Factset
FDS
$9.05B
| $2.63M | ﹤0.01% |
9,200
+8,400
| +1,050% | +$3.21M |
|
2044
Abbott
ABT
$180B
| $2.63M | ﹤0.01% |
19,656
-19,983
| -50% | -$2.62M |
|
2045
PUT
Jackson Financial
JXN
$8.32B
| $2.63M | ﹤0.01% |
26,000
+3,800
| +17% | +$355K |
|
|
SNV
2046
CALL
DELISTED
Synovus
SNV
| $2.63M | ﹤0.01% |
53,600
+18,900
| +54% | +$969K |
|
|
RNAM
2047
PUT
DELISTED
Avidity Biosciences
RNAM
| $2.63M | ﹤0.01% |
60,300
+58,700
| +3,669% | +$2.37M |
|
2048
PUT
Exelon
EXC
$48.6B
| $2.62M | ﹤0.01% |
58,300
-98,100
| -63% | -$4.31M |
|
2049
CALL
MKS Inc
MKSI
$22.2B
| $2.62M | ﹤0.01% |
21,200
+2,500
| +13% | +$266K |
|
2050
PUT
Kodiak Gas Services
KGS
$5.96B
| $2.62M | ﹤0.01% |
70,900
+48,100
| +211% | +$1.62M |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.