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 | |
|---|---|---|---|---|---|---|
|
FRMM
5926
PUT
Forum Markets
FRMM
$71.1M
| $86K | ﹤0.01% |
+3,580
| New | +$107K |
|
5927
Buckle
BKE
$2.25B
| $86K | ﹤0.01% |
+1,481
| New | +$80.1K |
|
5928
Clarivate
CLVT
$1.23B
| $86K | ﹤0.01% |
22,578
-30,161
| -57% | -$127K |
|
5929
Cheniere Energy
CQP
$32B
| $86K | ﹤0.01% |
1,601
+1,036
| +183% | +$56.3K |
|
5930
CALL
Manitowoc
MTW
$491M
| $86K | ﹤0.01% |
8,600
+2,600
| +43% | +$28.9K |
|
5931
PUT
Vanguard Dividend Appreciation ETF
VIG
$111B
| $86K | ﹤0.01% |
400
-800
| -67% | -$168K |
|
5932
AutoZone
AZO
$49.3B
| $85K | ﹤0.01% |
20
-346
| -95% | -$1.39M |
|
5933
Enovis
ENOV
$1.65B
| $85K | ﹤0.01% |
+2,817
| New | +$85.4K |
|
5934
PUT
Expeditors International
EXPD
$22.1B
| $85K | ﹤0.01% |
700
-400
| -36% | -$47.6K |
|
5935
Graphic Packaging
GPK
$3.15B
| $85K | ﹤0.01% |
+4,390
| New | +$95.5K |
|
5936
The Joint Corp
JYNT
$120M
| $85K | ﹤0.01% |
8,972
+6,010
| +203% | +$65.2K |
|
5937
CALL
Paymentus
PAY
$4.21B
| $85K | ﹤0.01% |
2,800
+2,300
| +460% | +$76K |
|
|
TUYA
5938
PUT
Tuya Inc
TUYA
$1.03B
| $85K | ﹤0.01% |
34,600
+27,000
| +355% | +$67.6K |
|
5939
CALL
InfraCap MLP ETF
AMZA
$471M
| $84K | ﹤0.01% |
3,400
-5,800
| -63% | -$246K |
|
5940
Xtrackers Harvest CSI 300 China A-Shares ETF
ASHR
$1.54B
| $84K | ﹤0.01% |
+2,554
| New | +$76.8K |
|
5941
CALL
Certara
CERT
$1.23B
| $84K | ﹤0.01% |
6,900
-2,600
| -27% | -$28.4K |
|
5942
PUT
Grindr
GRND
$2.98B
| $84K | ﹤0.01% |
5,600
-5,600
| -50% | -$98.2K |
|
5943
PUT
Lifecore Biomedical
LFCR
$161M
| $84K | ﹤0.01% |
11,500
+9,800
| +576% | +$74.2K |
|
5944
PUT
First Trust Exchange-Traded Fund VI Multi-Asset Diversified Income Index Fund
MDIV
$429M
| $84K | ﹤0.01% |
1,600
-1,000
| -38% | -$16.1K |
|
5945
PUT
Perma-Fix Environmental Services
PESI
$350M
| $84K | ﹤0.01% |
8,400
+200
| +2% | +$2.21K |
|
5946
Vanguard Russell 1000 Growth ETF
VONG
$42.3B
| $84K | ﹤0.01% |
702
-206
| -23% | -$23.6K |
|
5947
PUT
Woodside Energy
WDS
$44.5B
| $84K | ﹤0.01% |
5,600
-3,800
| -40% | -$62.6K |
|
|
YSG
5948
CALL
Yatsen Holding
YSG
$324M
| $84K | ﹤0.01% |
9,300
-52,000
| -85% | -$495K |
|
|
OZEM
5949
Roundhill GLP-1 & Weight Loss ETF
OZEM
$61.3M
| $84K | ﹤0.01% |
+3,108
| New | +$80K |
|
5950
Vanguard Short-Term Bond ETF
BSV
$44.6B
| $83K | ﹤0.01% |
+1,057
| New | +$83.1K |
|
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.