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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 | |
|---|---|---|---|---|---|---|---|
4551
Vanguard Russell 2000 ETF
VTWO
$16.6B
| $215K | ﹤0.01% |
1,915
+1,007
| +111% | +$120K |
2026 Q2
1 quarter
|
|
4552
Medical Properties Trust
MPT
$983M
| $215K | ﹤0.01% |
62,084
-462,147
| -88% | -$1.94M |
2025 Q3
4 quarters
|
|
4553
Progyny
PGNY
$2.66B
| $215K | ﹤0.01% |
8,526
+990
| +13% | +$28K |
2025 Q2
5 quarters
|
|
4554
CALL
Petco
WOOF
$816M
| $215K | ﹤0.01% |
94,600
+17,600
| +23% | +$46.2K |
2026 Q1
2 quarters
|
|
4555
Fortuna Silver Mines
FSM
$2.67B
| $214K | ﹤0.01% |
19,072
-4,406
| -19% | -$45.9K |
2025 Q4
3 quarters
|
|
4556
PUT
Urban Outfitters
URBN
$7.4B
| $214K | ﹤0.01% |
2,800
+1,200
| +75% | +$90.4K |
2021 Q1
22 quarters
|
|
4557
CALL
Avalo Therapeutics
AVTX
$449M
| $213K | ﹤0.01% |
13,900
-4,600
| -25% | -$84.7K |
2025 Q2
5 quarters
|
|
4558
KLA
KLAC
$198B
| $213K | ﹤0.01% |
1,093
-121,951
| -99% | -$23.9M |
2026 Q1
2 quarters
|
|
4559
Jefferies Financial Group
JEF
$10.5B
| $213K | ﹤0.01% |
+4,657
| New | +$246K |
2026 Q3
0 quarters
|
|
4560
PUT
Immunome
IMNM
$2.22B
| $213K | ﹤0.01% |
9,900
+3,900
| +65% | +$96.8K |
2024 Q1
10 quarters
|
|
4561
CALL
Synaptics
SYNA
$4.69B
| $213K | ﹤0.01% |
2,100
-700
| -25% | -$74K |
2014 Q4
47 quarters
|
|
4562
ClearPoint Neuro
CLPT
$272M
| $213K | ﹤0.01% |
17,413
-2,497
| -13% | -$37.5K |
2025 Q3
4 quarters
|
|
4563
Scorpio Tankers
STNG
$4.24B
| $212K | ﹤0.01% |
+2,537
| New | +$201K |
2026 Q3
0 quarters
|
|
4564
CALL
HEICO Corp Class A
HEI.A
$35.4B
| $212K | ﹤0.01% |
700
-800
| -53% | -$199K |
2021 Q1
22 quarters
|
|
4565
CALL
Tiziana Life Sciences
TLSA
$72.5M
| $212K | ﹤0.01% |
191,100
+139,500
| +270% | +$145K |
2025 Q1
6 quarters
|
|
4566
-1x Short VIX Futures ETF
SVIX
$122M
| $212K | ﹤0.01% |
7,372
-34,042
| -82% | -$891K |
2023 Q2
13 quarters
|
|
4567
Civeo
CVEO
$369M
| $212K | ﹤0.01% |
6,458
+6,349
| +5,825% | +$211K |
2026 Q2
1 quarter
|
|
4568
CALL
Galiano Gold
GAU
$597M
| $211K | ﹤0.01% |
108,900
+83,500
| +329% | +$169K |
2024 Q1
10 quarters
|
|
4569
PUT
XPO
XPO
$22.5B
| $211K | ﹤0.01% |
1,200
-500
| -29% | -$98.1K |
2021 Q2
21 quarters
|
|
4570
PUT
Qfin Holdings
QFIN
$646M
| $211K | ﹤0.01% |
31,500
+12,000
| +62% | +$135K |
2020 Q4
23 quarters
|
|
4571
Gemini Space Station
GEMI
$312M
| $211K | ﹤0.01% |
40,889
+22,763
| +126% | +$102K |
2026 Q2
1 quarter
|
|
4572
PUT
Kinetik
KNTK
$4.42B
| $211K | ﹤0.01% |
4,200
-9,200
| -69% | -$477K |
2023 Q4
11 quarters
|
|
4573
CALL
ANI Pharmaceuticals
ANIP
$1.62B
| $211K | ﹤0.01% |
2,900
+2,100
| +263% | +$162K |
2026 Q1
2 quarters
|
|
4574
CALL
Grifois
GRFS
$5.91B
| $211K | ﹤0.01% |
28,800
+9,600
| +50% | +$73.3K |
2019 Q3
28 quarters
|
|
4575
PUT
Palladyne AI
PDYN
$159M
| $211K | ﹤0.01% |
40,800
-43,500
| -52% | -$245K |
2025 Q1
6 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.