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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 | |
|---|---|---|---|---|---|---|---|
4951
PUT
Watsco Inc
WSO
$12.8B
| $151K | ﹤0.01% |
500
+300
| +150% | +$100K |
2025 Q4
3 quarters
|
|
4952
CALL
Olema Pharmaceuticals
OLMA
$662M
| $151K | ﹤0.01% |
17,500
+13,100
| +298% | +$143K |
2023 Q2
13 quarters
|
|
4953
CALL
Immuneering
IMRX
$238M
| $151K | ﹤0.01% |
36,900
-33,100
| -47% | -$156K |
2025 Q4
3 quarters
|
|
4954
United Parks & Resorts
PRKS
$1.82B
| $151K | ﹤0.01% |
+4,654
| New | +$197K |
2026 Q3
0 quarters
|
|
4955
PUT
NewAmsterdam Pharma
NAMS
$2.4B
| $151K | ﹤0.01% |
6,200
+3,000
| +94% | +$82.9K |
2024 Q4
7 quarters
|
|
4956
CALL
Valvoline
VVV
$4.42B
| $151K | ﹤0.01% |
5,000
-4,000
| -44% | -$137K |
2018 Q2
33 quarters
|
|
4957
CALL
Robert Half
RHI
$4.3B
| $151K | ﹤0.01% |
4,100
-800
| -16% | -$31.6K |
2015 Q4
43 quarters
|
|
4958
CALL
Wave Life Sciences
WVE
$617M
| $151K | ﹤0.01% |
40,700
-40,200
| -50% | -$211K |
2024 Q3
8 quarters
|
|
4959
PUT
MINISO
MNSO
$3.19B
| $150K | ﹤0.01% |
16,200
+8,400
| +108% | +$92.3K |
2020 Q4
23 quarters
|
|
4960
CALL
General Fusion Group
GFUZ
$346M
| $150K | ﹤0.01% |
+20,300
| New | +$168K |
2026 Q3
0 quarters
|
|
4961
UNIFI
UFI
$123M
| $150K | ﹤0.01% |
22,980
+15,648
| +213% | +$104K |
2023 Q4
11 quarters
|
|
4962
Zura Bio
ZURA
$119M
| $150K | ﹤0.01% |
36,047
+33,407
| +1,265% | +$178K |
2025 Q4
3 quarters
|
|
4963
Richardson Electronics
RELL
$270M
| $150K | ﹤0.01% |
8,454
-10,579
| -56% | -$189K |
2025 Q4
3 quarters
|
|
4964
Ocular Therapeutix
OCUL
$1.37B
| $150K | ﹤0.01% |
19,536
-116,720
| -86% | -$1.14M |
2023 Q4
11 quarters
|
|
4965
REX Drone ETF
DRNZ
$80M
| $150K | ﹤0.01% |
7,537
+2,423
| +47% | +$52K |
2026 Q1
2 quarters
|
|
4966
PUT
CareCloud
CCLD
$112M
| $150K | ﹤0.01% |
73,400
+63,800
| +665% | +$147K |
2025 Q2
5 quarters
|
|
4967
CALL
Inter&Co
INTR
$1.75B
| $150K | ﹤0.01% |
28,000
+27,900
| +27,900% | +$153K |
2023 Q4
11 quarters
|
|
4968
CALL
Camping World
CWH
$449M
| $149K | ﹤0.01% |
29,700
+16,800
| +130% | +$104K |
2017 Q2
37 quarters
|
|
4969
PUT
Kopin
KOPN
$631M
| $149K | ﹤0.01% |
32,400
-14,900
| -32% | -$64.7K |
2025 Q1
6 quarters
|
|
4970
PUT
Ivanhoe Electric
IE
$1.11B
| $149K | ﹤0.01% |
15,000
-48,800
| -76% | -$487K |
2024 Q3
8 quarters
|
|
4971
CALL
Palladyne AI
PDYN
$159M
| $149K | ﹤0.01% |
28,800
-600
| -2% | -$3.38K |
2025 Q1
6 quarters
|
|
4972
PUT
W.R. Berkley
WRB
$28.8B
| $149K | ﹤0.01% |
2,200
+2,100
| +2,100% | +$148K |
2022 Q4
15 quarters
|
|
4973
CALL
United States 12 Month Oil Fund,
USL
$46M
| $148K | ﹤0.01% |
2,600
-100
| -4% | -$5.17K |
2026 Q2
1 quarter
|
|
4974
PUT
Oceaneering
OII
$3.55B
| $148K | ﹤0.01% |
3,400
-4,300
| -56% | -$205K |
2026 Q1
2 quarters
|
|
4975
PUT
Patria Investments
PAX
$1.49B
| $148K | ﹤0.01% |
14,600
+13,800
| +1,725% | +$151K |
2021 Q1
22 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.