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 | |
|---|---|---|---|---|---|---|
1801
CALL
Recursion Pharmaceuticals
RXRX
$1.57B
| $3.44M | ﹤0.01% |
704,700
+218,400
| +45% | +$1.15M |
|
1802
Regeneron Pharmaceuticals
REGN
$68.8B
| $3.44M | ﹤0.01% |
+6,114
| New | +$3.46M |
|
1803
CALL
Aurora
AUR
$11.7B
| $3.43M | ﹤0.01% |
636,800
+317,800
| +100% | +$1.86M |
|
1804
PUT
Williams Companies
WMB
$90.5B
| $3.43M | ﹤0.01% |
54,100
-177,500
| -77% | -$10.4M |
|
1805
PUT
Dropbox
DBX
$6.81B
| $3.42M | ﹤0.01% |
113,400
-8,300
| -7% | -$237K |
|
1806
CALL
Gossamer Bio
GOSS
$66.5M
| $3.42M | ﹤0.01% |
1,302,400
+770,800
| +145% | +$1.7M |
|
1807
CALL
Hormel Foods
HRL
$13.9B
| $3.42M | ﹤0.01% |
138,400
-59,600
| -30% | -$1.65M |
|
1808
PUT
Synchrony
SYF
$23.7B
| $3.42M | ﹤0.01% |
48,200
-14,300
| -23% | -$1.04M |
|
1809
PUT
Ciena
CIEN
$55.3B
| $3.42M | ﹤0.01% |
23,500
-77,700
| -77% | -$7.91M |
|
1810
PUT
Performance Food Group
PFGC
$17.5B
| $3.42M | ﹤0.01% |
32,900
+27,100
| +467% | +$2.71M |
|
|
KOCG
1811
PUT
DELISTED
FIS Knights of Columbus Global Belief ETF
KOCG
| $3.42M | ﹤0.01% |
61,100
+9,000
| +17% | +$282K |
|
1812
CALL
Sphere Entertainment
SPHR
$4.88B
| $3.41M | ﹤0.01% |
54,900
+35,300
| +180% | +$1.67M |
|
1813
CALL
Huntington Bancshares
HBAN
$35.1B
| $3.41M | ﹤0.01% |
197,400
-4,500
| -2% | -$76.9K |
|
1814
CALL
RUM Group Inc
RUM
$1.57B
| $3.41M | ﹤0.01% |
470,900
-700
| -0.1% | -$5.72K |
|
1815
PUT
Viking Therapeutics
VKTX
$4.04B
| $3.41M | ﹤0.01% |
129,700
-41,400
| -24% | -$1.24M |
|
1816
PUT
Academy Sports + Outdoors
ASO
$2.89B
| $3.4M | ﹤0.01% |
68,000
| – | – |
|
1817
PUT
B2Gold
BTG
$5.16B
| $3.4M | ﹤0.01% |
686,500
+86,400
| +14% | +$340K |
|
1818
PUT
Blackstone Mortgage Trust
BXMT
$2.82B
| $3.4M | ﹤0.01% |
184,600
-7,900
| -4% | -$152K |
|
1819
CALL
nVent Electric
NVT
$24.5B
| $3.39M | ﹤0.01% |
34,400
+5,900
| +21% | +$512K |
|
1820
PUT
Diageo
DEO
$46.2B
| $3.39M | ﹤0.01% |
35,500
-3,000
| -8% | -$315K |
|
1821
CALL
ASP Isotopes
ASPI
$487M
| $3.38M | ﹤0.01% |
351,100
+243,700
| +227% | +$2.25M |
|
1822
CALL
Exelon
EXC
$48.6B
| $3.38M | ﹤0.01% |
75,000
-33,600
| -31% | -$1.48M |
|
|
APLS
1823
CALL
DELISTED
Apellis Pharmaceuticals
APLS
| $3.37M | ﹤0.01% |
149,100
+5,000
| +3% | +$117K |
|
1824
PUT
BioMarin Pharmaceuticals
BMRN
$11.5B
| $3.37M | ﹤0.01% |
62,200
+19,600
| +46% | +$1.12M |
|
1825
PUT
Stryker
SYK
$127B
| $3.36M | ﹤0.01% |
9,100
-4,100
| -31% | -$1.58M |
|
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.