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 | |
|---|---|---|---|---|---|---|
7576
PUT
Central Pacific Financial
CPF
$1.01B
| $15K | ﹤0.01% |
500
+400
| +400% | +$11.7K |
|
|
CVGW
7577
DELISTED
Calavo Growers
CVGW
| $15K | ﹤0.01% |
607
-6,972
| -92% | -$188K |
|
7578
PUT
Denali Therapeutics
DNLI
$3.74B
| $15K | ﹤0.01% |
1,100
-28,600
| -96% | -$411K |
|
|
EEX
7579
CALL
DELISTED
Emerald Holding
EEX
| $15K | ﹤0.01% |
3,000
| – | – |
|
7580
8x8 Inc
EGHT
$262M
| $15K | ﹤0.01% |
7,418
+1,042
| +16% | +$2.1K |
|
7581
Empire State Realty Trust
ESRT
$969M
| $15K | ﹤0.01% |
1,996
-6,264
| -76% | -$47.9K |
|
7582
CALL
F&G Annuities & Life
FG
$3.93B
| $15K | ﹤0.01% |
500
-5,000
| -91% | -$165K |
|
|
HEPS
7583
D-Market Electronic Services & Trading
HEPS
$1.01B
| $15K | ﹤0.01% |
5,646
+5,210
| +1,195% | +$14.5K |
|
7584
PUT
Huazhu Hotels Group
HTHT
$12.9B
| $15K | ﹤0.01% |
400
-51,000
| -99% | -$1.78M |
|
7585
CALL
MarineMax
HZO
$799M
| $15K | ﹤0.01% |
600
-300
| -33% | -$7.64K |
|
7586
InfuSystem Holdings
INFU
$189M
| $15K | ﹤0.01% |
1,511
+939
| +164% | +$7.79K |
|
7587
PUT
IPG Photonics
IPGP
$3.81B
| $15K | ﹤0.01% |
+200
| New | +$15.6K |
|
7588
IZEA Worldwide
IZEA
$58.3M
| $15K | ﹤0.01% |
4,112
| – | – |
|
7589
JPMorgan Ultra-Short Income ETF
JPST
$40.1B
| $15K | ﹤0.01% |
314
+94
| +43% | +$4.76K |
|
7590
PUT
Lands' End
LE
$375M
| $15K | ﹤0.01% |
1,100
+500
| +83% | +$6.66K |
|
7591
MINISO
MNSO
$3.72B
| $15K | ﹤0.01% |
682
-1,338
| -66% | -$28.6K |
|
7592
VanEck Agribusiness ETF
MOO
$988M
| $15K | ﹤0.01% |
+215
| New | +$15.9K |
|
7593
CALL
Mercury Systems
MRCY
$6.23B
| $15K | ﹤0.01% |
+200
| New | +$12.4K |
|
7594
Neumora Therapeutics
NMRA
$308M
| $15K | ﹤0.01% |
+8,501
| New | +$13.7K |
|
7595
PUT
OFS Capital
OFS
$46M
| $15K | ﹤0.01% |
+2,000
| New | +$16.8K |
|
7596
Phibro Animal Health
PAHC
$1.43B
| $15K | ﹤0.01% |
+380
| New | +$12.6K |
|
7597
PUT
PennantPark Floating Rate Capital
PFLT
$692M
| $15K | ﹤0.01% |
1,700
-700
| -29% | -$7.17K |
|
7598
CALL
Paysafe
PSFE
$440M
| $15K | ﹤0.01% |
1,200
+200
| +20% | +$2.67K |
|
7599
PUT
RadNet
RDNT
$4.84B
| $15K | ﹤0.01% |
200
+100
| +100% | +$6.49K |
|
7600
Shenandoah Telecom
SHEN
$637M
| $15K | ﹤0.01% |
1,128
-2,107
| -65% | -$28.9K |
|
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.