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 | |
|---|---|---|---|---|---|---|
7526
PUT
Empire State Realty Trust
ESRT
$969M
| $16K | ﹤0.01% |
+2,100
| New | +$16.1K |
|
7527
CALL
FTI Consulting
FCN
$4.88B
| $16K | ﹤0.01% |
100
| – | – |
|
|
7528
PUT
FTI Consulting
FCN
$4.88B
| $16K | ﹤0.01% |
100
| – | – |
|
7529
CALL
First Trust US Equity Opportunities ETF
FPX
$1.51B
| $16K | ﹤0.01% |
100
| – | – |
|
7530
Greif
GEF
$4.56B
| $16K | ﹤0.01% |
271
+36
| +15% | +$2.32K |
|
7531
Gerdau
GGB
$9.48B
| $16K | ﹤0.01% |
5,260
-31,218
| -86% | -$94.5K |
|
7532
Genasys
GNSS
$74.2M
| $16K | ﹤0.01% |
6,734
+6,252
| +1,297% | +$12.3K |
|
7533
CALL
iShares S&P GSCI Commodity-Indexed Trust
GSG
$981M
| $16K | ﹤0.01% |
700
-300
| -30% | -$6.79K |
|
|
COLO
7534
Global X MSCI Colombia ETF
COLO
$198M
| $16K | ﹤0.01% |
493
-7,785
| -94% | -$242K |
|
7535
Hain Celestial
HAIN
$46M
| $16K | ﹤0.01% |
10,696
-1,269
| -11% | -$2.16K |
|
7536
HUTCHMED
HCM
$1.91B
| $16K | ﹤0.01% |
1,029
-1,028
| -50% | -$16.9K |
|
7537
International Money Express
IMXI
$386M
| $16K | ﹤0.01% |
1,200
-566
| -32% | -$7.01K |
|
7538
CALL
InfuSystem Holdings
INFU
$189M
| $16K | ﹤0.01% |
+1,600
| New | +$13.3K |
|
7539
CALL
Lincoln Educational Services
LINC
$1.29B
| $16K | ﹤0.01% |
700
-300
| -30% | -$6.43K |
|
7540
LPL Financial
LPLA
$26.5B
| $16K | ﹤0.01% |
+50
| New | +$18.1K |
|
7541
CALL
Mativ Holdings
MATV
$455M
| $16K | ﹤0.01% |
1,500
-12,200
| -89% | -$121K |
|
|
ORIO
7542
PUT
Orion Digital Corp
ORIO
$15.4M
| $16K | ﹤0.01% |
9,300
+7,800
| +520% | +$14.2K |
|
7543
Omnicell
OMCL
$1.89B
| $16K | ﹤0.01% |
537
-7,249
| -93% | -$223K |
|
7544
CALL
Outlook Therapeutics
OTLK
$198M
| $16K | ﹤0.01% |
15,300
-4,100
| -21% | -$7.09K |
|
7545
PUT
Paysign
PAYS
$497M
| $16K | ﹤0.01% |
2,600
+1,500
| +136% | +$9.59K |
|
7546
CALL
Playboy Inc
PLBY
$143M
| $16K | ﹤0.01% |
11,300
-7,500
| -40% | -$12.9K |
|
7547
PUT
PRA Group
PRAA
$683M
| $16K | ﹤0.01% |
1,100
+800
| +267% | +$13K |
|
7548
Pyxis Oncology
PYXS
$184M
| $16K | ﹤0.01% |
7,433
-5,182
| -41% | -$7.46K |
|
7549
CALL
Regencell Bioscience
RGC
$2.88B
| $16K | ﹤0.01% |
+1,100
| New | +$15.8K |
|
7550
CALL
Rockwell Medical
RMTI
$27.6M
| $16K | ﹤0.01% |
+1,340
| New | +$16.4K |
|
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.