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 | |
|---|---|---|---|---|---|---|
6226
CALL
Medallion Financial
MFIN
$233M
| $63K | ﹤0.01% |
6,300
-17,800
| -74% | -$181K |
|
6227
Rollins
ROL
$18.5B
| $63K | ﹤0.01% |
+1,088
| New | +$61.9K |
|
|
RVPH
6228
DELISTED
REVIVA PHARMA HLDGS INC
RVPH
| $63K | ﹤0.01% |
8,626
-2,777
| -24% | -$23.6K |
|
6229
CALL
Boston Beer
SAM
$1.93B
| $63K | ﹤0.01% |
300
-1,800
| -86% | -$383K |
|
6230
CALL
Simmons First National
SFNC
$3.38B
| $63K | ﹤0.01% |
3,300
+3,100
| +1,550% | +$61.9K |
|
6231
CALL
Steven Madden
SHOO
$3.5B
| $63K | ﹤0.01% |
1,900
-2,600
| -58% | -$72.9K |
|
6232
CALL
Tiptree Inc
TIPT
$655M
| $63K | ﹤0.01% |
+3,300
| New | +$73.5K |
|
6233
PUT
Viavi Solutions
VIAV
$8.65B
| $63K | ﹤0.01% |
5,000
+1,300
| +35% | +$14.3K |
|
6234
American Healthcare REIT
AHR
$10.7B
| $63K | ﹤0.01% |
+1,523
| New | +$61.2K |
|
|
CCC
6235
CCC Intelligent Solutions
CCC
$3.56B
| $62K | ﹤0.01% |
+6,862
| New | +$66.4K |
|
6236
CALL
Community Health Systems
CYH
$391M
| $62K | ﹤0.01% |
19,500
-62,400
| -76% | -$187K |
|
6237
CALL
Horizon Technology Finance
HRZN
$300M
| $62K | ﹤0.01% |
10,200
+9,200
| +920% | +$66.9K |
|
6238
iRhythm Holdings
IRTC
$3.91B
| $62K | ﹤0.01% |
+362
| New | +$57.5K |
|
6239
CALL
Kite Realty
KRG
$5.88B
| $62K | ﹤0.01% |
2,800
+2,300
| +460% | +$51.3K |
|
6240
MYR Group
MYRG
$5.15B
| $62K | ﹤0.01% |
+300
| New | +$56K |
|
6241
Ranpak Holdings
PACK
$442M
| $62K | ﹤0.01% |
11,044
-62
| -0.6% | -$271 |
|
|
PLYM
6242
CALL
DELISTED
Plymouth Industrial REIT
PLYM
| $62K | ﹤0.01% |
2,800
+1,800
| +180% | +$33K |
|
6243
CALL
Thryv Holdings
THRY
$180M
| $62K | ﹤0.01% |
+5,200
| New | +$65.8K |
|
6244
PUT
Turkcell
TKC
$4.72B
| $62K | ﹤0.01% |
10,400
+6,000
| +136% | +$35.1K |
|
|
FLD
6245
CALL
Fold Holdings
FLD
$22.9M
| $62K | ﹤0.01% |
+16,100
| New | +$63.4K |
|
|
WTMY
6246
PUT
WisdomTree High Income Laddered Municipal Fund
WTMY
$5.01M
| $62K | ﹤0.01% |
1,200
+1,000
| +500% | +$25K |
|
|
ABX
6247
CALL
Abacus Global Management
ABX
$1B
| $61K | ﹤0.01% |
10,800
+6,100
| +130% | +$36.2K |
|
|
CVSA
6248
Covista Inc
CVSA
$4.3B
| $61K | ﹤0.01% |
399
-948
| -70% | -$121K |
|
6249
Alibaba
BABA
$279B
| $61K | ﹤0.01% |
343
-314,029
| -100% | -$41.1M |
|
6250
Invesco DB Agriculture Fund
DBA
$1.23B
| $61K | ﹤0.01% |
+2,300
| New | +$61.3K |
|
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.