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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 | |
|---|---|---|---|---|---|---|---|
3551
Triumph Financial Inc
TFIN
$1.43B
| $507K | ﹤0.01% |
8,451
+3,625
| +75% | +$263K |
2025 Q3
4 quarters
|
|
3552
PUT
DELISTED
Beazer Homes USA
BZH
| $507K | ﹤0.01% |
15,200
+10,800
| +245% | +$353K |
2018 Q2
33 quarters
|
|
3553
PUT
21shares Hyperliquid Staking ETF
THYP
$71.2M
| $507K | ﹤0.01% |
+9,900
| New | +$408K |
2026 Q3
0 quarters
|
|
3554
CALL
Kingsoft Cloud Holdings
KC
$2.24B
| $506K | ﹤0.01% |
55,500
-44,000
| -44% | -$458K |
2020 Q3
24 quarters
|
|
3555
PUT
Beam Therapeutics
BEAM
$2.42B
| $506K | ﹤0.01% |
20,700
+16,900
| +445% | +$470K |
2020 Q4
23 quarters
|
|
3556
PUT
Biohaven
BHVN
$2.05B
| $506K | ﹤0.01% |
37,900
+20,000
| +112% | +$289K |
2022 Q4
15 quarters
|
|
3557
CALL
JOYY Inc
JOYY
$3.9B
| $506K | ﹤0.01% |
6,300
+5,100
| +425% | +$379K |
2021 Q1
22 quarters
|
|
3558
Vornado Realty Trust
VNO
$6.49B
| $505K | ﹤0.01% |
14,912
-943
| -6% | -$35.7K |
2026 Q1
2 quarters
|
|
3559
CALL
Securitize Corp
SECZ
$1.31B
| $505K | ﹤0.01% |
+34,600
| New | +$290K |
2026 Q3
0 quarters
|
|
3560
iShares 1-3 Year Treasury Bond ETF
SHY
$27.4B
| $505K | ﹤0.01% |
+6,214
| New | +$508K |
2026 Q3
0 quarters
|
|
|
3561
CALL
Beam Therapeutics
BEAM
$2.42B
| $504K | ﹤0.01% |
20,600
+14,000
| +212% | +$390K |
2020 Q4
23 quarters
|
|
3562
ProShares UltraShort QQQ
QID
$264M
| $504K | ﹤0.01% |
38,213
+37,266
| +3,935% | +$534K |
2025 Q3
4 quarters
|
|
3563
CALL
Aramark
ARMK
$14B
| $503K | ﹤0.01% |
9,400
-28,500
| -75% | -$1.64M |
2017 Q3
36 quarters
|
|
3564
CALL
Pony AI Inc
PONY
$1.9B
| $503K | ﹤0.01% |
76,900
-231,700
| -75% | -$1.69M |
2025 Q2
5 quarters
|
|
3565
Eversource Energy
ES
$27.2B
| $503K | ﹤0.01% |
7,836
+4,792
| +157% | +$341K |
2026 Q2
1 quarter
|
|
3566
CALL
Ashland
ASH
$3.42B
| $503K | ﹤0.01% |
7,400
-43,400
| -85% | -$3.06M |
2026 Q2
1 quarter
|
|
3567
Helmerich & Payne
HP
$3.73B
| $502K | ﹤0.01% |
13,517
-7,514
| -36% | -$291K |
2026 Q1
2 quarters
|
|
3568
CALL
Copa Holdings
CPA
$5.79B
| $501K | ﹤0.01% |
3,800
+1,700
| +81% | +$232K |
2022 Q3
16 quarters
|
|
3569
CALL
Ginkgo Bioworks
DNA
$615M
| $500K | ﹤0.01% |
39,000
+22,500
| +136% | +$183K |
2026 Q1
2 quarters
|
|
3570
BP
BP
$117B
| $500K | ﹤0.01% |
+11,360
| New | +$487K |
2026 Q3
0 quarters
|
|
3571
CALL
Blue Owl Capital
OBDC
$5.29B
| $499K | ﹤0.01% |
47,600
-12,000
| -20% | -$133K |
2026 Q1
2 quarters
|
|
3572
Delek Logistics
DKL
$3.07B
| $498K | ﹤0.01% |
+9,353
| New | +$521K |
2026 Q3
0 quarters
|
|
3573
PUT
Herbalife
HLF
$1.66B
| $497K | ﹤0.01% |
41,000
-60,800
| -60% | -$748K |
2014 Q4
47 quarters
|
|
3574
CALL
Kinetik
KNTK
$4.41B
| $497K | ﹤0.01% |
9,900
-17,700
| -64% | -$917K |
2024 Q1
10 quarters
|
|
3575
Amplitude
AMPL
$2.21B
| $496K | ﹤0.01% |
35,820
+24,958
| +230% | +$288K |
2026 Q1
2 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.