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 | |
|---|---|---|---|---|---|---|
|
FIGR
3726
CALL
Figure Technology Solutions
FIGR
$6.09B
| $541K | ﹤0.01% |
+14,900
| New | +$579K |
|
3727
CALL
Full Truck Alliance
YMM
$9.64B
| $540K | ﹤0.01% |
41,700
+37,700
| +943% | +$467K |
|
3728
VF Corp
VFC
$7.16B
| $539K | ﹤0.01% |
37,405
-80,967
| -68% | -$1.09M |
|
3729
Ziff Davis
ZD
$1.95B
| $539K | ﹤0.01% |
14,164
+13,574
| +2,301% | +$475K |
|
3730
PUT
Icahn Enterprises
IEP
$5.26B
| $538K | ﹤0.01% |
64,000
-17,600
| -22% | -$154K |
|
3731
PUT
FT Vest Gold Strategy Target Income ETF
IGLD
$505M
| $537K | ﹤0.01% |
4,400
-1,300
| -23% | -$29K |
|
3732
PUT
Lithia Motors
LAD
$8.17B
| $537K | ﹤0.01% |
1,700
-6,300
| -79% | -$2.03M |
|
3733
PUT
Dine Brands
DIN
$458M
| $536K | ﹤0.01% |
21,700
+20,900
| +2,613% | +$490K |
|
|
AGNT
3734
CALL
AGNT Inc
AGNT
$661M
| $536K | ﹤0.01% |
50,300
+45,700
| +993% | +$483K |
|
3735
CALL
First Citizens BancShares
FCNCA
$25B
| $536K | ﹤0.01% |
300
-1,200
| -80% | -$2.37M |
|
3736
CALL
DXP Enterprises
DXPE
$2.49B
| $535K | ﹤0.01% |
4,500
+2,800
| +165% | +$313K |
|
|
ESPR
3737
DELISTED
Esperion Therapeutics
ESPR
| $535K | ﹤0.01% |
202,089
-28,374
| -12% | -$54.9K |
|
|
UNIT
3738
CALL
Uniti Group
UNIT
$2.53B
| $534K | ﹤0.01% |
87,400
-75,400
| -46% | -$451K |
|
3739
CALL
Palladyne AI
PDYN
$239M
| $534K | ﹤0.01% |
62,200
+35,000
| +129% | +$290K |
|
3740
CALL
AMES National
ATLO
$271M
| $533K | ﹤0.01% |
26,400
+1,600
| +6% | +$30.8K |
|
|
ONIT
3741
Onity Group
ONIT
$341M
| $533K | ﹤0.01% |
13,344
-3,255
| -20% | -$131K |
|
3742
PUT
AllianceBernstein
AB
$3.49B
| $531K | ﹤0.01% |
13,900
+1,200
| +9% | +$48K |
|
3743
CALL
iShares iBonds 2030 Term High Yield and Income ETF
IBHJ
$151M
| $531K | ﹤0.01% |
6,100
+800
| +15% | +$21.3K |
|
3744
CALL
Immunome
IMNM
$2.63B
| $531K | ﹤0.01% |
45,400
-23,600
| -34% | -$235K |
|
3745
CALL
Boot Barn
BOOT
$4.81B
| $530K | ﹤0.01% |
3,200
+200
| +7% | +$34.5K |
|
3746
iShares MSCI Chile ETF
ECH
$1B
| $530K | ﹤0.01% |
16,094
+3,653
| +29% | +$116K |
|
|
FYBR
3747
PUT
DELISTED
Frontier Communications
FYBR
| $530K | ﹤0.01% |
14,200
-6,300
| -31% | -$233K |
|
3748
CALL
USA Compression Partners
USAC
$3.75B
| $530K | ﹤0.01% |
22,100
+2,000
| +10% | +$48.1K |
|
3749
CALL
FS KKR Capital
FSK
$3.08B
| $528K | ﹤0.01% |
35,400
+6,800
| +24% | +$129K |
|
|
TGR
3750
PUT
DELISTED
ISHARES TARGET DATE RETIREMENT INCOME ETF
TGR
| $528K | ﹤0.01% |
13,300
+7,600
| +133% | +$302K |
|
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.