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 | |
|---|---|---|---|---|---|---|
4976
PUT
Flowers Foods
FLO
$1.51B
| $193K | ﹤0.01% |
14,800
+12,500
| +543% | +$189K |
|
4977
PUT
Newell Brands
NWL
$2.18B
| $193K | ﹤0.01% |
37,000
-4,600
| -11% | -$26.1K |
|
4978
Ollie's Bargain Outlet
OLLI
$4.4B
| $193K | ﹤0.01% |
1,504
-5,651
| -79% | -$750K |
|
4979
PUT
Camden Property Trust
CPT
$11.2B
| $192K | ﹤0.01% |
1,800
+800
| +80% | +$87.9K |
|
|
SUIG
4980
Sui Group Holdings
SUIG
$70.4M
| $192K | ﹤0.01% |
+49,754
| New | +$225K |
|
4981
PUT
Mueller Industries
MLI
$14.8B
| $192K | ﹤0.01% |
3,800
+3,600
| +1,800% | +$165K |
|
|
MURA
4982
CALL
DELISTED
Mural Oncology
MURA
| $192K | ﹤0.01% |
93,000
+33,300
| +56% | +$71.6K |
|
4983
PUT
Olin
OLN
$2.53B
| $192K | ﹤0.01% |
7,700
+4,400
| +133% | +$97.7K |
|
4984
CALL
ProShares UltraShort Industrials
SIJ
$5.97M
| $192K | ﹤0.01% |
2,150
+800
| +59% | +$19.3K |
|
4985
CALL
SoundThinking
SSTI
$103M
| $192K | ﹤0.01% |
16,000
| – | – |
|
4986
PUT
Atour Lifestyle Holdings
ATAT
$4.66B
| $191K | ﹤0.01% |
5,100
-8,000
| -61% | -$292K |
|
4987
CALL
Gaming and Leisure Properties
GLPI
$12.7B
| $191K | ﹤0.01% |
4,100
-23,700
| -85% | -$1.12M |
|
4988
CALL
Markel Group
MKL
$23.6B
| $191K | ﹤0.01% |
100
-800
| -89% | -$1.57M |
|
4989
PUT
Merit Medical Systems
MMSI
$4.97B
| $191K | ﹤0.01% |
2,300
-100
| -4% | -$8.71K |
|
|
SII
4990
PUT
Sprott
SII
$2.75B
| $191K | ﹤0.01% |
2,300
-2,900
| -56% | -$202K |
|
4991
PUT
UL Solutions
ULS
$18.6B
| $191K | ﹤0.01% |
2,700
+2,300
| +575% | +$157K |
|
4992
PUT
Cullinan Oncology
CGEM
$1.08B
| $190K | ﹤0.01% |
32,200
-28,700
| -47% | -$210K |
|
4993
PUT
Essent Group
ESNT
$6.12B
| $190K | ﹤0.01% |
3,000
+100
| +3% | +$6.08K |
|
4994
Matthews International
MATW
$866M
| $190K | ﹤0.01% |
7,848
-1,388
| -15% | -$34.1K |
|
4995
Range Nuclear Renaissance Index ETF
NUKZ
$768M
| $190K | ﹤0.01% |
+2,924
| New | +$175K |
|
4996
Simplify Short Term Treasury Futures Strategy ETF
TUA
$699M
| $190K | ﹤0.01% |
8,697
-5,323
| -38% | -$116K |
|
4997
AutoNation
AN
$7.18B
| $189K | ﹤0.01% |
866
-1,834
| -68% | -$387K |
|
4998
Direxion Daily Energy Bull 2X ETF
ERX
$233M
| $189K | ﹤0.01% |
3,368
-6,360
| -65% | -$345K |
|
4999
PUT
EverQuote
EVER
$886M
| $189K | ﹤0.01% |
8,300
+7,900
| +1,975% | +$191K |
|
5000
CALL
Freedom Holding
FRHC
$9.88B
| $189K | ﹤0.01% |
1,100
+800
| +267% | +$135K |
|
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.