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 | |
|---|---|---|---|---|---|---|
1926
CALL
Texas Pacific Land
TPL
$28.9B
| $2.99M | ﹤0.01% |
9,600
-13,500
| -58% | -$4.25M |
|
1927
CALL
Lincoln National
LNC
$7.91B
| $2.98M | ﹤0.01% |
74,000
-81,600
| -52% | -$3.16M |
|
1928
CALL
UL Solutions
ULS
$17.2B
| $2.98M | ﹤0.01% |
42,100
+31,200
| +286% | +$2.13M |
|
1929
CALL
Coursera
COUR
$1.54B
| $2.98M | ﹤0.01% |
254,700
+79,600
| +45% | +$865K |
|
1930
TKO Group
TKO
$13.5B
| $2.98M | ﹤0.01% |
14,753
-19,343
| -57% | -$3.54M |
|
1931
HubSpot
HUBS
$10.5B
| $2.97M | ﹤0.01% |
6,350
+3,222
| +103% | +$1.62M |
|
1932
CALL
Wingstop
WING
$3.68B
| $2.97M | ﹤0.01% |
11,800
+2,500
| +27% | +$777K |
|
1933
Direxion Daily AAPL Bull 2X ETF
AAPU
$193M
| $2.96M | ﹤0.01% |
91,751
+63,427
| +224% | +$1.66M |
|
1934
CALL
Lightbridge
LTBR
$246M
| $2.96M | ﹤0.01% |
139,500
+47,400
| +51% | +$713K |
|
1935
CALL
Xponential Fitness
XPOF
$265M
| $2.96M | ﹤0.01% |
379,500
+296,900
| +359% | +$2.71M |
|
1936
PUT
Box
BOX
$4.02B
| $2.96M | ﹤0.01% |
91,600
+60,100
| +191% | +$1.95M |
|
1937
CALL
Fortive
FTV
$19B
| $2.95M | ﹤0.01% |
60,200
+39,400
| +189% | +$1.94M |
|
1938
CALL
Ocular Therapeutix
OCUL
$1.86B
| $2.95M | ﹤0.01% |
252,100
+96,300
| +62% | +$1.15M |
|
1939
PUT
Regions Financial
RF
$26.3B
| $2.94M | ﹤0.01% |
111,700
+6,300
| +6% | +$164K |
|
1940
PUT
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.9B
| $2.94M | ﹤0.01% |
95,900
+49,700
| +108% | +$1.37M |
|
|
ABK
1941
CALL
DELISTED
Ambac Financial Group
ABK
| $2.94M | ﹤0.01% |
353,100
-17,600
| -5% | -$147K |
|
1942
CALL
Urban Outfitters
URBN
$5.99B
| $2.94M | ﹤0.01% |
41,200
+18,800
| +84% | +$1.38M |
|
1943
Dynatrace
DT
$12.1B
| $2.94M | ﹤0.01% |
60,707
+24,196
| +66% | +$1.22M |
|
1944
ACM Research
ACMR
$5.83B
| $2.94M | ﹤0.01% |
75,018
-20,692
| -22% | -$614K |
|
1945
CALL
Root
ROOT
$917M
| $2.94M | ﹤0.01% |
32,800
+11,300
| +53% | +$1.18M |
|
1946
CALL
Clover Health Investments
CLOV
$2.28B
| $2.93M | ﹤0.01% |
958,300
+458,700
| +92% | +$1.31M |
|
1947
CALL
Bread Financial
BFH
$4.21B
| $2.93M | ﹤0.01% |
52,500
+46,900
| +838% | +$2.89M |
|
1948
PUT
Invesco Equal Weight 0-30 Year Treasury ETF
GOVI
$1.22B
| $2.92M | ﹤0.01% |
41,100
+11,500
| +39% | +$315K |
|
1949
PUT
StoneCo
STNE
$2.62B
| $2.92M | ﹤0.01% |
154,600
+20,300
| +15% | +$323K |
|
1950
PUT
Aurora
AUR
$11.7B
| $2.92M | ﹤0.01% |
542,200
+28,500
| +6% | +$167K |
|
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.