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 | |
|---|---|---|---|---|---|---|
3901
Blink Charging
BLNK
$74.1M
| $472K | ﹤0.01% |
288,295
+86,395
| +43% | +$96K |
|
|
PINC
3902
PUT
DELISTED
Premier
PINC
| $472K | ﹤0.01% |
+17,000
| New | +$411K |
|
3903
PUT
Commault Systems
CVLT
$4.97B
| $471K | ﹤0.01% |
2,500
-66,700
| -96% | -$12M |
|
|
DRD
3904
PUT
DRDGold
DRD
$1.79B
| $471K | ﹤0.01% |
17,100
+5,500
| +47% | +$98.4K |
|
3905
Euronet Worldwide
EEFT
$3.15B
| $471K | ﹤0.01% |
5,369
+5,149
| +2,340% | +$494K |
|
3906
PUT
Honda
HMC
$39.3B
| $471K | ﹤0.01% |
15,300
-183,100
| -92% | -$5.97M |
|
3907
PUT
indie Semiconductor
INDI
$678M
| $471K | ﹤0.01% |
115,800
+110,600
| +2,127% | +$456K |
|
3908
CALL
Avita Medical
RCEL
$142M
| $471K | ﹤0.01% |
92,200
+77,200
| +515% | +$403K |
|
|
CTLP
3909
PUT
DELISTED
Cantaloupe
CTLP
| $470K | ﹤0.01% |
44,500
+36,800
| +478% | +$401K |
|
|
FLNA
3910
Filana Therapeutics
FLNA
$42.7M
| $470K | ﹤0.01% |
161,678
+144,417
| +837% | +$332K |
|
3911
PUT
JB Hunt Transport Services
JBHT
$26.1B
| $469K | ﹤0.01% |
3,500
-11,200
| -76% | -$1.61M |
|
|
CPRX
3912
CALL
DELISTED
Catalyst Pharmaceutical
CPRX
| $468K | ﹤0.01% |
23,800
+19,100
| +406% | +$393K |
|
|
CD
3913
Chaince Digital Holdings
CD
$244M
| $468K | ﹤0.01% |
+19,049
| New | +$120K |
|
3914
CALL
Brunswick
BC
$5.33B
| $467K | ﹤0.01% |
7,400
+5,400
| +270% | +$335K |
|
3915
Global Ship Lease
GSL
$1.57B
| $467K | ﹤0.01% |
+15,236
| New | +$454K |
|
3916
PagerDuty
PD
$795M
| $467K | ﹤0.01% |
+28,309
| New | +$450K |
|
3917
PUT
Revolution Medicines
RVMD
$39.1B
| $467K | ﹤0.01% |
10,000
+5,200
| +108% | +$204K |
|
3918
PUT
Vanguard FTSE Developed Markets ETF
VEA
$225B
| $467K | ﹤0.01% |
7,800
-12,500
| -62% | -$729K |
|
3919
Liberty Global Class A
LBTYA
$3.49B
| $466K | ﹤0.01% |
+40,689
| New | +$448K |
|
3920
PUT
NovoCure
NVCR
$1.89B
| $465K | ﹤0.01% |
36,000
+11,500
| +47% | +$154K |
|
|
SVM
3921
Silvercorp Metals
SVM
$2.08B
| $465K | ﹤0.01% |
73,715
-68,887
| -48% | -$337K |
|
3922
CALL
Apogee Therapeutics
APGE
$10.1B
| $464K | ﹤0.01% |
11,700
-7,000
| -37% | -$267K |
|
3923
PUT
iShares iBonds 2030 Term High Yield and Income ETF
IBHJ
$151M
| $464K | ﹤0.01% |
20,600
+12,600
| +158% | +$335K |
|
3924
PUT
Qorvo
QRVO
$8.09B
| $464K | ﹤0.01% |
5,100
-9,100
| -64% | -$810K |
|
3925
CALL
Acadia Pharmaceuticals
ACAD
$4.45B
| $463K | ﹤0.01% |
21,700
+7,600
| +54% | +$180K |
|
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.