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 | |
|---|---|---|---|---|---|---|
6126
PUT
BGC Group
BGC
$5.6B
| $69K | ﹤0.01% |
7,300
+500
| +7% | +$5.01K |
|
6127
Capital Group Dividend Value ETF
CGDV
$37.4B
| $69K | ﹤0.01% |
1,658
+58
| +4% | +$2.38K |
|
6128
CALL
Central Pacific Financial
CPF
$1.02B
| $69K | ﹤0.01% |
+2,300
| New | +$67.4K |
|
6129
CALL
The Greenbrier Companies
GBX
$1.52B
| $69K | ﹤0.01% |
1,500
-9,200
| -86% | -$438K |
|
6130
CALL
Ingles Markets
IMKTA
$1.7B
| $69K | ﹤0.01% |
1,000
-100
| -9% | -$6.67K |
|
|
NEWP
6131
New Pacific Metals
NEWP
$881M
| $69K | ﹤0.01% |
25,488
+25,454
| +74,865% | +$47.3K |
|
6132
CALL
OFS Capital
OFS
$44.1M
| $69K | ﹤0.01% |
9,100
+5,000
| +122% | +$42.1K |
|
6133
PUT
Advanced Drainage Systems
WMS
$10.5B
| $69K | ﹤0.01% |
500
-1,500
| -75% | -$197K |
|
6134
CALL
Xencor
XNCR
$1.59B
| $69K | ﹤0.01% |
+5,900
| New | +$51.2K |
|
|
SARO
6135
StandardAero Inc
SARO
$9.64B
| $69K | ﹤0.01% |
+2,561
| New | +$71.9K |
|
|
IMSR
6136
PUT
Terrestrial Energy
IMSR
$553M
| $69K | ﹤0.01% |
+65,200
| New | +$775K |
|
6137
American Homes 4 Rent
AMH
$11.9B
| $68K | ﹤0.01% |
+2,068
| New | +$72.1K |
|
6138
CALL
Avalo Therapeutics
AVTX
$1.03B
| $68K | ﹤0.01% |
5,400
+1,400
| +35% | +$12K |
|
6139
BJ's Restaurants
BJRI
$1.56B
| $68K | ﹤0.01% |
+2,257
| New | +$80.5K |
|
6140
Cerus
CERS
$579M
| $68K | ﹤0.01% |
43,248
+37,793
| +693% | +$51K |
|
6141
CALL
Dime Commercial Bancshares
DCOM
$1.8B
| $68K | ﹤0.01% |
2,300
+2,000
| +667% | +$58.6K |
|
|
FWDI
6142
Forward Industries Inc
FWDI
$303M
| $68K | ﹤0.01% |
+2,695
| New | +$44.4K |
|
6143
CALL
First Trust Asia Pacific ex-Japan AlphaDEX Fund
FPA
$102M
| $68K | ﹤0.01% |
+1,200
| New | +$43.9K |
|
6144
Lakeland Industries
LAKE
$109M
| $68K | ﹤0.01% |
4,650
-581
| -11% | -$8.46K |
|
|
MITT
6145
CALL
TPG Mortgage Investment Trust
MITT
$225M
| $68K | ﹤0.01% |
9,500
+6,900
| +265% | +$52.4K |
|
6146
PUT
Nomad Foods
NOMD
$1.73B
| $68K | ﹤0.01% |
5,200
+2,900
| +126% | +$45.4K |
|
6147
Saratoga Investment
SAR
$307M
| $68K | ﹤0.01% |
2,829
+2,828
| +282,800% | +$70.6K |
|
6148
CALL
Allison Transmission
ALSN
$9.57B
| $67K | ﹤0.01% |
800
-7,300
| -90% | -$650K |
|
|
ARI
6149
CALL
Apollo Commercial Real Estate
ARI
$851M
| $67K | ﹤0.01% |
6,700
+100
| +2% | +$1.02K |
|
6150
BRC Inc
BRCC
$119M
| $67K | ﹤0.01% |
43,108
+21,553
| +100% | +$34.5K |
|
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.