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 | |
|---|---|---|---|---|---|---|
1826
PUT
Bausch Health
BHC
$1.65B
| $3.36M | ﹤0.01% |
521,200
+33,700
| +7% | +$230K |
|
1827
PUT
Exelixis
EXEL
$13.9B
| $3.35M | ﹤0.01% |
81,100
-36,900
| -31% | -$1.48M |
|
1828
PUT
Eldorado Gold
EGO
$8.31B
| $3.35M | ﹤0.01% |
115,800
+33,900
| +41% | +$798K |
|
1829
Uranium Energy
UEC
$4.71B
| $3.34M | ﹤0.01% |
250,670
+109,006
| +77% | +$1.09M |
|
1830
State Street Utilities Select Sector SPDR ETF
XLU
$24.1B
| $3.34M | ﹤0.01% |
76,688
+75,026
| +4,514% | +$3.17M |
|
1831
CALL
UWM Holdings
UWMC
$621M
| $3.33M | ﹤0.01% |
547,700
+431,100
| +370% | +$2.26M |
|
1832
PUT
PagerDuty
PD
$700M
| $3.33M | ﹤0.01% |
201,600
-199,500
| -50% | -$3.17M |
|
1833
PUT
Urban Outfitters
URBN
$5.99B
| $3.33M | ﹤0.01% |
46,600
+21,600
| +86% | +$1.59M |
|
1834
CALL
Upexi
UPXI
$58.8M
| $3.31M | ﹤0.01% |
573,300
+533,300
| +1,333% | +$3.24M |
|
1835
CALL
STMicroelectronics
STM
$46B
| $3.3M | ﹤0.01% |
116,800
-18,200
| -13% | -$509K |
|
1836
PUT
American Water Works
AWK
$26.3B
| $3.3M | ﹤0.01% |
23,700
+17,400
| +276% | +$2.46M |
|
1837
PUT
Sweetgreen
SG
$713M
| $3.29M | ﹤0.01% |
412,900
+120,200
| +41% | +$1.31M |
|
1838
PUT
SBA Communications
SBAC
$18.4B
| $3.29M | ﹤0.01% |
17,000
-18,900
| -53% | -$4.09M |
|
|
KNGS
1839
CALL
DELISTED
Roundhill S&P Dividend Monarchs ETF
KNGS
| $3.28M | ﹤0.01% |
76,000
+34,400
| +83% | +$1.49M |
|
1840
CALL
GoDaddy
GDDY
$12.3B
| $3.28M | ﹤0.01% |
24,000
-20,600
| -46% | -$3.17M |
|
1841
CALL
Antero Midstream
AM
$10.8B
| $3.28M | ﹤0.01% |
168,800
+84,000
| +99% | +$1.52M |
|
1842
CALL
Flutter Entertainment
FLUT
$17.6B
| $3.28M | ﹤0.01% |
12,900
+1,300
| +11% | +$380K |
|
|
CTRA
1843
PUT
DELISTED
Coterra Energy
CTRA
| $3.27M | ﹤0.01% |
138,400
+53,300
| +63% | +$1.29M |
|
1844
Keurig Dr Pepper
KDP
$40.4B
| $3.27M | ﹤0.01% |
+128,301
| New | +$4.02M |
|
1845
CALL
Viasat
VSAT
$9.79B
| $3.27M | ﹤0.01% |
111,700
-37,900
| -25% | -$907K |
|
1846
PUT
Lincoln National
LNC
$7.91B
| $3.27M | ﹤0.01% |
81,000
+300
| +0.4% | +$11.6K |
|
1847
CALL
Parker-Hannifin
PH
$125B
| $3.26M | ﹤0.01% |
4,300
+300
| +8% | +$221K |
|
1848
Constellation Brands
STZ
$22.2B
| $3.26M | ﹤0.01% |
24,201
+18,310
| +311% | +$2.91M |
|
1849
Blue Owl Capital
OWL
$6.39B
| $3.26M | ﹤0.01% |
+192,455
| New | +$3.66M |
|
1850
PUT
Tyson Foods
TSN
$20.2B
| $3.26M | ﹤0.01% |
60,000
-169,100
| -74% | -$9.34M |
|
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.