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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 | |
|---|---|---|---|---|---|---|---|
2451
CALL
Cinemark Holdings
CNK
$4.79B
| $1.28M | ﹤0.01% |
34,400
+18,900
| +122% | +$658K |
2021 Q2
21 quarters
|
|
2452
PUT
Arhaus
ARHS
$2.06B
| $1.28M | ﹤0.01% |
135,400
-100
| -0.1% | -$852 |
2022 Q4
15 quarters
|
|
2453
PUT
Breakwave Tanker Shipping ETF
BWET
$76.1M
| $1.28M | ﹤0.01% |
11,700
+8,900
| +318% | +$3.73M |
2026 Q1
2 quarters
|
|
2454
CALL
Mondelez International
MDLZ
$84.4B
| $1.28M | ﹤0.01% |
22,100
-19,400
| -47% | -$1.19M |
2014 Q4
47 quarters
|
|
2455
Definium Therapeutics
DFTX
$4.63B
| $1.28M | ﹤0.01% |
33,571
-14,080
| -30% | -$593K |
2024 Q4
7 quarters
|
|
2456
Strive Inc
ASST
$2.95B
| $1.28M | ﹤0.01% |
43,393
-33,798
| -44% | -$627K |
2026 Q1
2 quarters
|
|
2457
CALL
Aptiv
APTV
$7.98B
| $1.28M | ﹤0.01% |
34,300
-13,100
| -28% | -$662K |
2016 Q3
40 quarters
|
|
2458
PUT
Iron Mountain
IRM
$33.5B
| $1.28M | ﹤0.01% |
11,500
-6,900
| -38% | -$827K |
2021 Q2
21 quarters
|
|
2459
CALL
Payoneer
PAYO
$2.43B
| $1.27M | ﹤0.01% |
178,300
-9,000
| -5% | -$64.1K |
2021 Q2
21 quarters
|
|
2460
CALL
Kulicke & Soffa
KLIC
$3.83B
| $1.27M | ﹤0.01% |
13,500
+11,000
| +440% | +$1.02M |
2015 Q4
43 quarters
|
|
2461
PUT
Goodyear
GT
$1.16B
| $1.27M | ﹤0.01% |
255,800
-130,200
| -34% | -$812K |
2014 Q4
47 quarters
|
|
2462
CALL
Alliance Resource Partners
ARLP
$3.25B
| $1.27M | ﹤0.01% |
52,300
-15,900
| -23% | -$405K |
2026 Q1
2 quarters
|
|
2463
PUT
Brookdale Senior Living
BKD
$2.21B
| $1.27M | ﹤0.01% |
117,300
+107,800
| +1,135% | +$1.42M |
2026 Q1
2 quarters
|
|
2464
CALL
Advanced Energy
AEIS
$9.38B
| $1.27M | ﹤0.01% |
4,500
+1,000
| +29% | +$293K |
2015 Q4
43 quarters
|
|
2465
CALL
AllianceBernstein
AB
$3.11B
| $1.26M | ﹤0.01% |
36,200
-74,700
| -67% | -$2.74M |
2018 Q3
32 quarters
|
|
2466
Entergy
ETR
$53.5B
| $1.26M | ﹤0.01% |
12,688
-743
| -6% | -$80.2K |
2026 Q1
2 quarters
|
|
2467
PUT
Keurig Dr Pepper
KDP
$52.1B
| $1.26M | ﹤0.01% |
41,500
+4,300
| +12% | +$134K |
2018 Q1
34 quarters
|
|
2468
CALL
Mineralys Therapeutics
MLYS
$1.43B
| $1.26M | ﹤0.01% |
50,100
+5,600
| +13% | +$152K |
2024 Q2
9 quarters
|
|
2469
CALL
Primo Brands
PRMB
$8.68B
| $1.26M | ﹤0.01% |
65,900
-16,800
| -20% | -$382K |
2024 Q4
7 quarters
|
|
2470
PUT
WhiteFiber Inc
WYFI
$405M
| $1.26M | ﹤0.01% |
69,700
+34,900
| +100% | +$840K |
2025 Q3
4 quarters
|
|
2471
PUT
Lithia Motors
LAD
$6.75B
| $1.25M | ﹤0.01% |
4,300
-10,800
| -72% | -$3.76M |
2020 Q4
23 quarters
|
|
2472
CALL
Bitwise Solana Staking ETF
BSOL
$694M
| $1.25M | ﹤0.01% |
77,700
+55,100
| +244% | +$676K |
2025 Q4
3 quarters
|
|
2473
American Tower
AMT
$88.2B
| $1.25M | ﹤0.01% |
7,666
-27,973
| -78% | -$4.8M |
2025 Q3
4 quarters
|
|
2474
Cintas
CTAS
$90.2B
| $1.25M | ﹤0.01% |
6,427
-1,420
| -18% | -$282K |
2025 Q1
6 quarters
|
|
2475
Corning
GLW
$104B
| $1.25M | ﹤0.01% |
8,149
-82,307
| -91% | -$13.1M |
2025 Q4
3 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.