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 | |
|---|---|---|---|---|---|---|
6901
CALL
Carlisle Companies
CSL
$13.5B
| $32K | ﹤0.01% |
100
-100
| -50% | -$38.1K |
|
|
HELP
6902
PUT
Cybin Inc
HELP
$490M
| $32K | ﹤0.01% |
5,500
+3,200
| +139% | +$22.7K |
|
6903
CALL
Amdocs
DOX
$6.03B
| $32K | ﹤0.01% |
400
-200
| -33% | -$17.3K |
|
6904
Excelerate Energy
EE
$1.19B
| $32K | ﹤0.01% |
1,285
-1,901
| -60% | -$47.5K |
|
6905
CALL
Edgewise Therapeutics
EWTX
$4.28B
| $32K | ﹤0.01% |
2,000
+800
| +67% | +$11.3K |
|
6906
MicroSectors FANG+ ETNs due Jan 8 2038
FNGS
$532M
| $32K | ﹤0.01% |
468
+151
| +48% | +$10.1K |
|
6907
Golub Capital BDC
GBDC
$3.33B
| $32K | ﹤0.01% |
2,346
+1,874
| +397% | +$27.6K |
|
|
GTY
6908
CALL
Getty Realty Corp
GTY
$2.16B
| $32K | ﹤0.01% |
1,200
+300
| +33% | +$8.37K |
|
6909
ICU Medical
ICUI
$4.16B
| $32K | ﹤0.01% |
+267
| New | +$33.8K |
|
6910
iShares Core MSCI International Developed Markets ETF
IDEV
$31.1B
| $32K | ﹤0.01% |
+400
| New | +$31.1K |
|
6911
Amplify Mobile Payments ETF
IPAY
$173M
| $32K | ﹤0.01% |
+570
| New | +$33.6K |
|
6912
PUT
John B. Sanfilippo & Son
JBSS
$986M
| $32K | ﹤0.01% |
500
+400
| +400% | +$25.9K |
|
6913
PUT
Kforce
KFRC
$1.05B
| $32K | ﹤0.01% |
+1,100
| New | +$39K |
|
6914
CALL
LifeVantage
LFVN
$80.1M
| $32K | ﹤0.01% |
3,300
+3,000
| +1,000% | +$37.6K |
|
6915
CALL
Malibu Boats
MBUU
$548M
| $32K | ﹤0.01% |
1,000
+900
| +900% | +$30.8K |
|
|
6916
PUT
Malibu Boats
MBUU
$548M
| $32K | ﹤0.01% |
1,000
+300
| +43% | +$10.3K |
|
6917
CALL
Movado Group
MOV
$840M
| $32K | ﹤0.01% |
1,700
+300
| +21% | +$5.2K |
|
6918
PUT
Paysafe
PSFE
$443M
| $32K | ﹤0.01% |
2,500
-40,800
| -94% | -$546K |
|
6919
CALL
Solid Biosciences
SLDB
$792M
| $32K | ﹤0.01% |
5,200
-24,700
| -83% | -$144K |
|
6920
PUT
SEACOR Marine Holdings
SMHI
$209M
| $32K | ﹤0.01% |
+5,000
| New | +$30.3K |
|
6921
PUT
Suzano
SUZ
$10.2B
| $32K | ﹤0.01% |
3,500
-33,400
| -91% | -$317K |
|
6922
CALL
Entrada Therapeutics
TRDA
$254M
| $32K | ﹤0.01% |
5,600
-200
| -3% | -$1.17K |
|
6923
CALL
United States Gasoline Fund
UGA
$146M
| $32K | ﹤0.01% |
500
-200
| -29% | -$12.7K |
|
6924
PUT
Universal Technical Institute
UTI
$2.26B
| $32K | ﹤0.01% |
+1,000
| New | +$29.4K |
|
6925
CALL
WSFS Financial
WSFS
$4.14B
| $32K | ﹤0.01% |
+600
| New | +$33.9K |
|
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.