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 | |
|---|---|---|---|---|---|---|
2126
PUT
Janus Henderson Small Cap Growth Alpha ETF
JSML
$366M
| $2.43M | ﹤0.01% |
50,500
+50,100
| +12,525% | +$3.56M |
|
2127
PUT
Western Alliance Bancorporation
WAL
$9.07B
| $2.43M | ﹤0.01% |
28,000
+13,900
| +99% | +$1.18M |
|
2128
Fastenal
FAST
$54B
| $2.42M | ﹤0.01% |
49,375
-2,806
| -5% | -$133K |
|
2129
CALL
loanDepot
LDI
$548M
| $2.42M | ﹤0.01% |
788,500
+701,700
| +808% | +$1.62M |
|
2130
PUT
SentinelOne
S
$6.22B
| $2.42M | ﹤0.01% |
137,400
-59,100
| -30% | -$1.06M |
|
2131
Vail Resorts
MTN
$5.19B
| $2.42M | ﹤0.01% |
16,165
+9,013
| +126% | +$1.4M |
|
|
HSAI
2132
PUT
Hesai Group
HSAI
$2.29B
| $2.41M | ﹤0.01% |
85,800
+19,000
| +28% | +$465K |
|
2133
PUT
Group 1 Automotive
GPI
$3.94B
| $2.41M | ﹤0.01% |
5,500
-600
| -10% | -$269K |
|
2134
CALL
Vaxcyte
PCVX
$7.89B
| $2.41M | ﹤0.01% |
66,800
+33,500
| +101% | +$1.11M |
|
2135
PUT
Norfolk Southern
NSC
$78.8B
| $2.4M | ﹤0.01% |
8,000
-600
| -7% | -$167K |
|
2136
PUT
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$263M
| $2.4M | ﹤0.01% |
31,600
+23,200
| +276% | +$1.56M |
|
2137
PUT
Enterprise Products Partners
EPD
$83.8B
| $2.4M | ﹤0.01% |
76,700
+35,200
| +85% | +$1.11M |
|
2138
PUT
BRC Group Holdings
RILY
$277M
| $2.4M | ﹤0.01% |
401,200
+106,900
| +36% | +$591K |
|
2139
PUT
EPR Properties
EPR
$4.86B
| $2.4M | ﹤0.01% |
41,300
+13,400
| +48% | +$753K |
|
2140
PUT
Fluence Energy
FLNC
$1.78B
| $2.4M | ﹤0.01% |
221,800
-26,100
| -11% | -$218K |
|
|
MRUS
2141
PUT
DELISTED
Merus
MRUS
| $2.39M | ﹤0.01% |
25,400
-300
| -1% | -$19.5K |
|
2142
CALL
Nokia
NOK
$50.8B
| $2.39M | ﹤0.01% |
496,400
+76,200
| +18% | +$344K |
|
2143
Simon Property Group
SPG
$74.5B
| $2.38M | ﹤0.01% |
12,712
+11,033
| +657% | +$1.9M |
|
2144
CALL
ATI
ATI
$27B
| $2.38M | ﹤0.01% |
29,300
-57,700
| -66% | -$4.68M |
|
2145
CALL
Global X S&P 500 Tail Risk ETF
XTR
$4.77M
| $2.38M | ﹤0.01% |
38,200
-9,300
| -20% | -$273K |
|
|
CYBR
2146
PUT
DELISTED
CyberArk
CYBR
| $2.37M | ﹤0.01% |
4,900
-4,200
| -46% | -$1.8M |
|
2147
Genius Sports
GENI
$1.73B
| $2.37M | ﹤0.01% |
191,240
+63,802
| +50% | +$763K |
|
2148
PUT
FMC
FMC
$1.42B
| $2.36M | ﹤0.01% |
70,300
+5,000
| +8% | +$195K |
|
2149
PUT
Pitney Bowes
PBI
$2.42B
| $2.36M | ﹤0.01% |
207,200
+6,200
| +3% | +$72.2K |
|
2150
CALL
West Pharmaceutical
WST
$23.1B
| $2.36M | ﹤0.01% |
9,000
-11,600
| -56% | -$2.82M |
|
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.