We are live on !
Find out more
Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
4701
PUT
IMAX
IMAX
$2.67B
| $186K | ﹤0.01% |
3,400
+400
| +13% | +$19.4K |
2026 Q2
1 quarter
|
|
4702
CALL
Delek Logistics
DKL
$3.08B
| $186K | ﹤0.01% |
3,500
-10,800
| -76% | -$601K |
2019 Q3
28 quarters
|
|
4703
PUT
Coty
COTY
$3.56B
| $186K | ﹤0.01% |
71,200
+48,200
| +210% | +$128K |
2015 Q1
46 quarters
|
|
4704
PUT
Norfolk Southern
NSC
$73.6B
| $185K | ﹤0.01% |
600
+100
| +20% | +$33.1K |
2014 Q4
47 quarters
|
|
4705
GrafTech
EAF
$261M
| $185K | ﹤0.01% |
+22,372
| New | +$164K |
2026 Q3
0 quarters
|
|
4706
CALL
GrabAGun Digital Holdings
PEW
$43.1M
| $185K | ﹤0.01% |
88,500
-64,900
| -42% | -$159K |
2025 Q3
4 quarters
|
|
4707
PUT
Karman Holdings
KRMN
$5.39B
| $185K | ﹤0.01% |
5,700
+2,900
| +104% | +$135K |
2025 Q3
4 quarters
|
|
4708
CALL
Structure Therapeutics
GPCR
$1.43B
| $184K | ﹤0.01% |
5,900
-400
| -6% | -$18.8K |
2023 Q4
11 quarters
|
|
4709
PUT
Annexon
ANNX
$748M
| $184K | ﹤0.01% |
43,600
-70,300
| -62% | -$353K |
2023 Q4
11 quarters
|
|
4710
CALL
Choice Hotels
CHH
$5.29B
| $184K | ﹤0.01% |
1,800
-2,500
| -58% | -$265K |
2025 Q3
4 quarters
|
|
4711
Celanese
CE
$5.64B
| $184K | ﹤0.01% |
4,149
-667
| -14% | -$30.5K |
2026 Q2
1 quarter
|
|
4712
Grayscale Hyperliquid Staking ETF
HYPG
$144M
| $184K | ﹤0.01% |
+5,866
| New | +$148K |
2026 Q3
0 quarters
|
|
4713
CALL
PDS Biotechnology
PDSB
$63.2M
| $184K | ﹤0.01% |
244,800
+86,000
| +54% | +$48.8K |
2026 Q1
2 quarters
|
|
4714
Smithfield Foods
SFD
$7.56B
| $184K | ﹤0.01% |
9,804
+8,229
| +522% | +$190K |
2026 Q2
1 quarter
|
|
4715
CALL
Urban Outfitters
URBN
$7.4B
| $183K | ﹤0.01% |
2,400
-100
| -4% | -$7.53K |
2021 Q1
22 quarters
|
|
4716
CALL
Mach Natural Resources
MNR
$1.54B
| $183K | ﹤0.01% |
17,900
+16,500
| +1,179% | +$206K |
2025 Q4
3 quarters
|
|
4717
RadNet
RDNT
$6.02B
| $183K | ﹤0.01% |
2,658
+1,986
| +296% | +$140K |
2025 Q4
3 quarters
|
|
4718
PUT
Braze
BRZE
$5.3B
| $183K | ﹤0.01% |
7,300
+6,100
| +508% | +$164K |
2022 Q2
17 quarters
|
|
4719
CALL
Navient Holdings, Inc. Common Stock
NAVI
$584M
| $183K | ﹤0.01% |
20,200
+8,300
| +70% | +$74.8K |
2015 Q4
43 quarters
|
|
4720
PUT
Sturm, Ruger & Co
RGR
$806M
| $183K | ﹤0.01% |
4,300
+300
| +8% | +$11.6K |
2014 Q4
47 quarters
|
|
4721
PUT
Armour Residential REIT
ARR
$1.69B
| $183K | ﹤0.01% |
13,200
+8,200
| +164% | +$132K |
2018 Q2
33 quarters
|
|
4722
Xperi
XPER
$296M
| $183K | ﹤0.01% |
33,123
-3,439
| -9% | -$23K |
2025 Q1
6 quarters
|
|
4723
TD Synnex
SNX
$19B
| $182K | ﹤0.01% |
709
-4,327
| -86% | -$1.1M |
2026 Q1
2 quarters
|
|
4724
CALL
Teledyne Technologies
TDY
$29.6B
| $182K | ﹤0.01% |
+300
| New | +$191K |
2026 Q3
0 quarters
|
|
4725
PUT
O-I Glass
OI
$764M
| $182K | ﹤0.01% |
32,200
+19,400
| +152% | +$146K |
2018 Q2
33 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.