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 | |
|---|---|---|---|---|---|---|
2076
YieldMax MSTR Option Income Strategy ETF
MSTY
$708M
| $2.56M | ﹤0.01% |
36,716
-4,622
| -11% | -$420K |
|
2077
CALL
Clear Secure
YOU
$5.26B
| $2.56M | ﹤0.01% |
76,700
-8,000
| -9% | -$265K |
|
2078
PUT
Calumet Specialty Products
CLMT
$3.63B
| $2.56M | ﹤0.01% |
140,200
+36,700
| +35% | +$604K |
|
2079
PUT
Idexx Laboratories
IDXX
$42.9B
| $2.56M | ﹤0.01% |
4,000
+2,500
| +167% | +$1.52M |
|
|
DQ
2080
PUT
Daqo New Energy
DQ
$790M
| $2.55M | ﹤0.01% |
90,800
+27,300
| +43% | +$640K |
|
2081
CALL
Vanguard ESG US Corporate Bond ETF
VCEB
$1.18B
| $2.55M | ﹤0.01% |
8,600
-3,700
| -30% | -$235K |
|
2082
Magnite
MGNI
$2.65B
| $2.55M | ﹤0.01% |
117,045
+64,211
| +122% | +$1.52M |
|
2083
PUT
SL Green Realty
SLG
$3.88B
| $2.55M | ﹤0.01% |
42,600
-16,300
| -28% | -$965K |
|
2084
PUT
iQIYI
IQ
$1.18B
| $2.54M | ﹤0.01% |
993,800
-52,800
| -5% | -$117K |
|
2085
Intellia Therapeutics
NTLA
$1.5B
| $2.54M | ﹤0.01% |
147,300
+70,523
| +92% | +$869K |
|
|
2086
CALL
iQIYI
IQ
$1.18B
| $2.54M | ﹤0.01% |
993,000
+202,100
| +26% | +$447K |
|
2087
CALL
Travelers Companies
TRV
$80.8B
| $2.54M | ﹤0.01% |
9,100
-3,300
| -27% | -$884K |
|
2088
CALL
Viking Holdings
VIK
$44.9B
| $2.54M | ﹤0.01% |
40,800
-7,200
| -15% | -$429K |
|
2089
CALL
American Water Works
AWK
$26.3B
| $2.53M | ﹤0.01% |
18,200
+12,100
| +198% | +$1.71M |
|
2090
PUT
Boyd Gaming
BYD
$6.47B
| $2.53M | ﹤0.01% |
29,300
+8,100
| +38% | +$680K |
|
2091
CALL
Natural Gas Services Group
NGS
$470M
| $2.53M | ﹤0.01% |
90,400
-19,400
| -18% | -$497K |
|
|
CNR
2092
CALL
Core Natural Resources Inc
CNR
$4.19B
| $2.53M | ﹤0.01% |
30,300
-2,700
| -8% | -$202K |
|
2093
CALL
PennyMac Financial
PFSI
$4.38B
| $2.53M | ﹤0.01% |
20,400
-800
| -4% | -$86.6K |
|
2094
CALL
Bank of Montreal
BMO
$125B
| $2.53M | ﹤0.01% |
19,400
+3,500
| +22% | +$414K |
|
2095
KLA
KLAC
$275B
| $2.52M | ﹤0.01% |
+23,390
| New | +$2.18M |
|
2096
CALL
Kimbell Royalty Partners
KRP
$1.47B
| $2.52M | ﹤0.01% |
187,000
-10,900
| -6% | -$153K |
|
2097
PUT
Texas Pacific Land
TPL
$28.9B
| $2.52M | ﹤0.01% |
8,100
| – | – |
|
2098
CALL
Jazz Pharmaceuticals
JAZZ
$15.9B
| $2.52M | ﹤0.01% |
19,100
+6,800
| +55% | +$816K |
|
2099
PUT
Sociedad Química y Minera de Chile
SQM
$19.6B
| $2.51M | ﹤0.01% |
58,500
+2,000
| +4% | +$83.4K |
|
|
GRMN
2100
CALL
Garmin
GRMN
$46.9B
| $2.51M | ﹤0.01% |
10,200
+2,100
| +26% | +$485K |
|
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.